Jeep wrangler p0300

I have a 2017 Jeep Wrangler Unlimited 3.6L - The check engine light came on and threw the code P0300, so I replaced the spark plugs, the CEL came back on …

Misfires, rough idle, P0300, p0174, p2099. Last year 2018 in June I had these same codes come up with really rough idle. I changed spark plugs and wires and it came back a month later. I took it to a mechanic and he couldn't find anything wrong with it.Random Misfire, Rough Idle, Surging. 2009 Unlimited X, 3.8 4x4 automatic. Hoping someone can point me in a good direction. Getting P0300, P0132, P0032 codes. Symptoms include rough idle and engine surging. Doesn't seem to have any power or acceleration issues, once past the initial sputtering.P0305 is a fairly common trouble code with the Jeep Wrangler.It’s and OBD2 code and stands for:. P0305: Misfire Detected → Cylinder 5. P0305 is certainly a cause for concern, and should be considered a threat to the drivability your Wrangler. The nice thing about P0305 is that it’s a cylinder specific trouble code, which makes diagnosing the …P0300 - Multiple/Random Cylinder Misfire. For a while, my check engine light would come on, and then go away after a while. My OBDII+Torque read P0300 and P0306. So Random/Multiple Misfires, and Cylinder 6 Misfire. I went ahead and changed out all the plugs and wires, as well as the coil pack. The light went away for a couple of weeks.Jan 19, 2015 · P2302 running rough. Hello new to the site, I have an issue with my 2008 Unlimited 4wd sahara. one day about 1 mile from my house my CEL light popped on and started blinking the jeep started running rough/misfiring so I turned around and went home. Did the 3 key turns to find P0300 and P2302 codes. After researching online I decided to replace ...

The code P0300 indicates there are repetitive misfires on one or more cylinders in your car. You will often find this code together with another code of the specific cylinder the misfire occurred on. If the last digit of the trouble code is not zero, e.g., if the generated code is P0302, the number 2 indicates that cylinder number 2 has a misfire.Its a #2 cylinder misfire. Make sure the wire is on nice and tight. Clear the code and run it. If/when the light comes back on with a P0302, move the #2 coil pack to a different location. Clear the code, wait for it to come back. If the problem is still #2, then try swapping the spark plug with another cylinder.Super secret hidden bonus brake lathe video! https://youtu.be/T4ugvdgaoHYCheck out my Merchandise Store Below the video for Men's and Women's Apparel, MUGS a...Jun 14, 2023 · dfoster716 said: I have a 2017 Jeep Wrangler Unlimited 3.6L - The check engine light came on and threw the code P0300, so I replaced the spark plugs, the CEL came back on almost a month later and I discovered that Jeep had a service bulletin stating that if the P0300 is thrown to bring the vehicle in to have the PCM updated. I brought the Jeep ... CKPS's are affected by extreme temperatures. There is a trick to get the CKPS to start working again; you pour some water on the sensor and let the vehicle sit a few minutes. The next time the engine is cranked over; it will start. This is a trick I used when one of the Jeeps would not restart after trail driving a few hours on a hot day. OP.P0137 is a fairly common OBDII code that occurs in the Jeep Wrangler, it’s a general code. This means that it has the same meaning for any vehicle. This code is supposed to let you know that there is an issue with the wiring or harness going to the sensor, or the sensor itself is bad. There are other things that cause P0137 to populate.Perhaps even more impressive than their revenue beat might the 10% growth in net income....AMZN I had just come off live television. All my ducks were in a row. Kind of. I thought....

Dec 28, 2012 · 5366 posts · Joined 2010. #1 · Dec 28, 2012. P0300, P0355 & P0339 with stumbling? I'm getting codes P0300, P0335 and P0339. I had to try and start the vehicle two or three times, and it won't rev passed 2500rpm or so (somewhere around there). It just stumbles or rev-limits and won't let it pass that RPM, in neutral or in gear, or in gear with ... The codes it pulled from that were P0300 multiple misfire and P0152 Bank 2 position 1 O2 sensor high voltage. I added some displays to the Torque app to look at my O2 voltages and found this - O2 bank 2 position 2 is at 0.0V and bank 1 is at 1.3V. The bank 1 sensors are right at 0.85 ish volts.Labor: 1.0. To diagnose the P2302 Jeep code, it typically requires 1.0 hour of labor. The specific diagnosis time and labor rates at auto repair shops can differ based on factors such as the location, make and model of the vehicle, and even the engine type. It is common for most auto repair shops to charge between $75 and $150 per hour.Oct 1, 2018 · P0300 is a generic OBDII code that can occur with the Jeep Wrangler. This code indicates that your vehicle's engine is misfiring and can be a drivability threat. P0300 is often accompanied by cylinder-specific misfire codes (P030X, where the X indicates the cylinder number that is misfiring).

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It's hard to feel the misfire when under throttle, but you can hear and feel the slight misfire trembles when at idle. What I've tried so far: - New Spark Plugs: (2 set's - 6 NKG & 6 Champion) Properly Gapped. - New Coils: MSD. - New O2 Sensors (all 4 - both sides) - New Crankshaft Position Sensor. - New MAP Sensor.Oct 7, 2016 · Drove the Jeep and after about 150 miles the code popped again. It had a pending misfire at about 50 miles, but at around 150 it went hard. Checked the monitors and Catalyst and Evap were not ready. Note: In California, the Evap monitor does not need to be ready to pass the smog test. 3) Swapped injectors #1 and #2. Drove Jeep with same result ... It read code P0052 - Voltage to high on Bank 2 Sensor 1 - essentially the new sensor I just put in. Other than the new Yellow light the car ran fine. I cleared the code and it IMMEDIATELY came back the next time I started the car. This time also with P1129 - some nonsense about the fuel loop. That one comes and goes.Modern versions of the Jeep include the Grand Cherokee, Wrangler, Compass, Patriot and Renegade. There have been many different model types of Jeep produced since its invention dur...Aug 4, 2022. #1. We have owned our Jeep for roughly two months. Code p0300 multiple engine misfire detected has popped up now 3 times. First time, took it to the dealership. They found failing coil packs and replaced three. Also had them replace all the spark plugs. Second time, took it to the dealer, no issues found.How about 2nd gear at 30 mph with multiple misfires. @JeepCares FCA advised me to bring it to another dealer. Next up. Westbury Jeep NY. Buy a cheap code reader. Make it misfire, then read codes.

2018 Jeep Wrangler Rubicon Unlimited Aug 22, 2022 #8 JL MADDOG said: P0300 is a random misfire code not specific to any particular cylinder. Try the following: 1. Make sure all your plugs are tight, 2. Check the wires to make sure they are secure and firmly attached, 3.2022 Sport S - Rubicon Express 3.5 lift, KMC XD 229 Machete Crawl in Satin Black 17x9, Maxxis Razr MT 37x13.5x17Nayef. P0300 is Multiple Cylinder Misfire. Normally, this would be because of bad electrical connections, or Vacuum Leake. So before you start throwing money at it, check your Positive and Negative cables at both ends for tight and rust free connections, and check for the Break Booster hose, Crankcase Breathing Hoses on top of your engine ...P0300 is a generic OBDII code that can occur with the Jeep Wrangler. This code indicates that your vehicle's engine is misfiring and can be a drivability threat. P0300 is often accompanied by cylinder-specific misfire codes (P030X, where the X indicates the cylinder number that is misfiring).Drove the Jeep and after about 150 miles the code popped again. It had a pending misfire at about 50 miles, but at around 150 it went hard. Checked the monitors and Catalyst and Evap were not ready. Note: In California, the Evap monitor does not need to be ready to pass the smog test. 3) Swapped injectors #1 and #2. Drove Jeep with same result ...If you own a Jeep, it’s crucial to stay informed about any potential recalls that may affect your vehicle’s safety and performance. One of the most effective ways to do this is by ...Aug 12, 2023 · P0300 Code (Random/Multiple Cylinder Misfire Detected) I have a 2009 Jeep JK with 123K miles on it. The spark plugs, spark plug wires, and coil pack assembly were replaced in 2017. The spark plugs were again replaced in December of 2018 (crap plugs). The check engine light came on which turned out to be a P0300 code (Random/Multiple Cylinder ... P0300 is a generic OBDII code that can occur with the Jeep Wrangler. This code indicates that your vehicle's engine is misfiring and can be a drivability threat. P0300 is often accompanied by cylinder-specific misfire codes (P030X, where the X indicates the cylinder number that is misfiring).If you’re in the market for a used Jeep Wrangler, you’re in luck. These iconic off-road vehicles are known for their durability, versatility, and rugged style. Whether you’re an ou...The Jeep Wrangler utilizes a crankshaft position sensor in order to regulate the engine timing. This sensor uses a reluctor to gauge the position of the crank. When the Wrangler's ECM determines that there is an issue with the signal coming from this sensor, it'll throw the P0335 trouble code. P0335 Symptoms: Jeep Wrangler

P0300 is a generic OBDII code that can occur with the Jeep Wrangler. This code indicates that your vehicle's engine is misfiring and can be a drivability threat. P0300 is often accompanied by cylinder-specific misfire codes (P030X, where the X indicates the cylinder number that is misfiring).

The Jeep Wrangler Rubicon is an iconic off-road vehicle known for its ruggedness and capability. However, Jeep offers a range of other models that may also catch your attention. On...May 6, 2021 · =====Claim your FREE engine code eraser 👉 https://free.nonda.co 👈=====Engine Code JEEP P0300 Saving Repai... There was a time (4,000 years ago) when simply being able to add might get your name on a clay tablet or help you accumulate vast wealth Advertisement Fractions. Calculus. Imaginar...Super secret hidden bonus brake lathe video! https://youtu.be/T4ugvdgaoHYCheck out my Merchandise Store Below the video for Men's and Women's Apparel, MUGS a...Apr 19, 2018 · The P0300 is a misfire, maybe you have a plug wire that isn’t seated right and the moisture is shorting something. It would go away with heat from the engine. You could try replacing your plug wires. P2096 is a downstream code for too lean. Until you sort the misfire you can probably ignore this. Perhaps even more impressive than their revenue beat might the 10% growth in net income....AMZN I had just come off live television. All my ducks were in a row. Kind of. I thought....When it comes to finding the perfect pair of jeans, men have a lot of options. But if you’re looking for a classic, timeless style that will last for years to come, then you can’t ...Their suggestion is to do a 'tune up' with new plugs and wires (yes, I told him it doesn't have plug wires) for about $400. The plugs are only $85 if I buy locally. He said it's about 2.5hrs labor. Even at $100 per hour it doesn't come up to $400 total. I don't know what to do at this point.When it comes to finding the perfect pair of jeans, Wrangler is a name that stands out. With a wide selection of styles and fits, it can be difficult to know which pair is right fo...

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46277 posts · Joined 2012. #2 · Feb 5, 2024. Welcome to the Forum! How to diagnose a P0300 fault code. To diagnose the fault code, you should use a scan tool to check for the additional codes that indicate which cylinder is affected. You will then want to test the spark plugs, fuel injectors and ignition coil.There were two main reasons why companies do not talk about homosexual employees. Last week, an overwhelming majority voted in favour of same-sex marriage in Ireland—the first nati...P0300 can't be tackled. Hello everyone! 2006 Jeep wrangler 2.4l 4 cylinder 101k miles. Got P0300 code and have replaced wiring harness (dealership), PCM (dealership), MAP (duralast), spark plugs (NGK Plat), going to change ignition coil and coil plugs next. TPS & MAF sensor changed within the last 10 months.The P0300 is the only code. I've checked what is pending several different times and it's the only one that shows up in Pending or as the CEL code. I didn't have much luck on the Wrangler forms but looking on the Gladiator forums, which has all the differences a JL would over a JK, this seems to be a rampant issue.www.Garagecouple.comBe sure to check out all 4 videos in this series to watch me diagnose this misfire issue:Episode 1: https://youtu.be/tQCg-jDuzlcEpisode 2...I have a 2000 Jeep Wrangler 4.0L, It is misfiring MIL light on, codes are P0300, PO304, PO303 for Multiple Misfire. Here are the following repairs I have done: *Replaced Ignition Plugs. *Replaced Ignition Coil Pack. *Replaced a Blown Headgasket. *Had Cylinder Head Machined (New Hardware, Headbolts n Valve Guides)here is what I have been able to find on my own for my '05 tj. p0300 - misfire detected in multiple cylinders. p2096 - post catalyst fuel trim system low limit. The p0300 has been getting thrown occasionally, I have not been able to track it down to bad gas or bad plugs. The plugs were just replaced with some champion OEM plugs about 2 …Engine is still running, I can accelerate, downshift gears, etc., but I pull over to get my code reader out. I get the following codes: P0300 - Random misfire. P0315 - Crankshaft Position Sensor not learned. P0335 - Crankshaft Position Sensor Circuit. I clear the codes and start it back up to see if it's a fluke issue.P0300 is a random misfire code not specific to any particular cylinder. Try the following: 1. Make sure all your plugs are tight, 2. Check the wires to make sure they are secure and firmly attached, 3. Insure each of the coil packs are fully seated. 4.1997 Jeep Wrangler P0300, p0301, p0302, p0303, p0304, p0305, p0306. I just took my 97 wrangler through inspection and they told me that I failed emissions. I looked up the codes, p0300 -p0306 and they say that I have firing issues on all six of my cylinders. I am experiencing no symptoms at all. The Jeep runs like a champ, and I have …My 2008 Jeep Wrangler Unlimited started running rough like it had a misfire and the check engine started flashing. I went to Autozone and it pulled codes P0300 and P2305 and the said the most common fix was the crankshaft position sensor. I got it and my friend installed it and said it takes a while for the computer to recognize the new sensor.Engine misfire. How to fix a random misfire in your car DIY with Scotty Kilmer. How to stop random engine misfire code P0300 with check engine light on. Engi... ….

2006 4.0 codes P0016, P0300, and P0339. Thread starter Cajun001; Start date Jul 8, 2020; Cajun001 Member. Joined Mar 3, 2020 Messages 43 Location Baton Rouge, La. Jul 8, 2020 #1 ... Produced from 1997-2006, many consider the Jeep Wrangler TJ to be the last true Wrangler.Any help with P0172/P0175. First got CEL for #1 misfire and#1 injector circuit fail. Replaced all injectors, plugs, and coil packs. Parts from Amazon. Injectors looked like OE. Who knows. Those CELs are gone and now I'm getting P0172/P0175 for running rich. I don't really want to have the dealer run diagnostic on it, but I'm almost there.May 15, 2023 · 2007 JK random P0300 code intermittently. I have a 2007 wrangler with 3.8L. Recently did a lot of work on the entire jeep it is at 164,000 miles. Replaced cats, 02 sensors, timing chain, exhaust manifolds, upper-oil pan gasket, valve cover gaskets, intake gaskets, head gasket on the drivers side of the engine (only removed the head because an ... It’s impossible to be too prepared when buying a home. It’s probably the biggest purchase you’ll ever make, but it’s also one of the most complicated as well. If you’re thinking of...P0306 is certainly a cause for concern, and should be considered a threat to the drivability your Wrangler. The nice thing about P0306 is that it’s a cylinder specific trouble code, which makes diagnosing the problems much more simple than P0300, which means that the cylinders are randomly misfiring.. It will often be accompanied by codes …It recently started running rough at 40mph and throwing P2308 & P0300 codes and flashing the CEL. I charged the battery, swapped the coil pack, wires, and plugs. It continues to throw the same codes and also now idles rough and flashes the CEL. ... Jeep Wrangler Forum. 9M posts 468.9K members Since 2005 A forum community …Boost your health knowledge by playing these interactive health games. The information on this site should not be used as a substitute for professional medical care or advice. Cont...P0300, random missfirs. P0175, rich bank 2. During driving test, scan equipment noted something about "cylinders 2, 4, 6 misfiring excessively". The shop also did some Google searching and found a service bulletin that seems to fit these codes. The bulletin was about the left side cylinder needing to be replaced and jeep even having an …5366 posts · Joined 2010. #1 · Dec 28, 2012. P0300, P0355 & P0339 with stumbling? I'm getting codes P0300, P0335 and P0339. I had to try and start the vehicle two or three times, and it won't rev passed 2500rpm or so (somewhere around there). It just stumbles or rev-limits and won't let it pass that RPM, in neutral or in gear, or in gear with ... Jeep wrangler p0300, 2007 JK random P0300 code intermittently. I have a 2007 wrangler with 3.8L. Recently did a lot of work on the entire jeep it is at 164,000 miles. Replaced cats, 02 sensors, timing chain, exhaust manifolds, upper-oil pan gasket, valve cover gaskets, intake gaskets, head gasket on the drivers side of the engine (only removed the head because an ..., Dec 15, 2018 · 2007 Jeep rubicon 3.8 misfire. 2007 3.8 Liter v6 rubicon no upgrades all stock throwing code # p2302 ignition coil A secondary circuit. I replaced coil pack , wires, plugs, and crank shaft sensor and still has two misses on the spark plugs in the center of the coils. , It is a 2005 rubicon unlimited 4.0L. 165,000 miles. I can feel a slight studded when it is in idle. (Sometimes it's more than slight but that is rare.) It throws the 0300, 0304, 0306 pcodes. 0306 was the original cod thrown. Over time it began throwing the 0300 and 0304. 0306 comes back first before 0304 after a reset., P0300 - Multiple/Random Cylinder Misfire. For a while, my check engine light would come on, and then go away after a while. My OBDII+Torque read P0300 and P0306. So Random/Multiple Misfires, and Cylinder 6 Misfire. I went ahead and changed out all the plugs and wires, as well as the coil pack. The light went away for a couple of weeks., Code P0300 is often related to bad spark plugs or spark plug wires but could be caused by a number of issues relating to ignition and the air-to-fuel ratio in the cylinders. When the air/fuel mixture in your cylinder (s) is not able to burn normally and the difference is severe enough, it may cause a misfiring cylinder problem in your vehicle ..., The causes of P0340 in the Jeep Wrangler can vary and go beyond the camshaft position sensor itself. Some possible causes include: A faulty camshaft position sensor. Damaged or corroded wiring and connectors. Timing chain or belt issues. Mechanical problems with the camshaft or crankshaft. Problems with the powertrain …, P0300 can't be tackled. Hello everyone! 2006 Jeep wrangler 2.4l 4 cylinder 101k miles. Got P0300 code and have replaced wiring harness (dealership), PCM (dealership), MAP (duralast), spark plugs (NGK Plat), going to change ignition coil and coil plugs next. TPS & MAF sensor changed within the last 10 months., #1. Need some speedy help! what's a decent scanner tool that will give the most information for a reasonable price? Anything available that will identify misfiring …, P0300, P0301, P0305 cyl misfire. Would really appreaciate some answers! Last week CEl came on. i changed the upstream 02 sensor on the passenger side, cleared the light and everything was going well. Then this week it hit me with p0305 (cyl 5). Thought it was the coil that went bad so i switched coil from cylinder 1 to cylinder 5 and 5 to 1., Aug 4, 2022. #1. We have owned our Jeep for roughly two months. Code p0300 multiple engine misfire detected has popped up now 3 times. First time, took it to the dealership. They found failing coil packs and replaced three. Also had them replace all the spark plugs. Second time, took it to the dealer, no issues found., March 14, 2022 by Jason. P0600 is a relatively uncommon OBD2 trouble code. It indicates that there’s been a communications failure between your Jeep Wrangler’s ECM and one or more of the separate modules that it communicates with. P0600 is a generic trouble code, so it has the same meaning for the Jeep Wrangler as it would any other vehicle., The Jeep Wrangler Rubicon is an iconic off-road vehicle known for its ruggedness and capability. However, Jeep offers a range of other models that may also catch your attention. On..., Mine was a cylinder #1 misfire, but this would work with any single cylinder misfire. Random misfires (P0300) would be troubleshot differently. I hope this helps others. Note: A P0303 may be caused by a Heat Soak issued which Jeep put out TSB 18-031-03 on it. Basically all you need to do is wrap a piece of insulation around the #3 injector and ..., S. sbollin Discussion starter. 42 posts · Joined 2014. #1 · Mar 10, 2016. I was driving to the dealer to pick up and cam sensor because I kept getting a P0344 code hoping it will cure it. On the way home my cel kept flashing and jeep was running rough. Now I'm getting p2305 and p0300., What causes the P0300 code to appear in a Jeep Wrangler? The P0300 code is a diagnostic trouble code (DTC) that indicates random or multiple-cylinder misfires in an engine. This code may appear in a Jeep Wrangler due to various reasons: a. Faulty spark plugs: Worn or damaged spark plugs may not ignite the air-fuel mixture properly, …, Perhaps even more impressive than their revenue beat might the 10% growth in net income....AMZN I had just come off live television. All my ducks were in a row. Kind of. I thought...., ONLY misfires on COLD start | Jeep Wrangler Forum. P0300 p0302 help!! ONLY misfires on COLD start. Replaced rockers and lifters on my 16’ jku 3.6L because i had the engine tick. No prior ECL’s. Cams were in god shape and i did not mess with the timing at all. Fast forward i put everything back together and immediately misfired for p0302., What does the P0300 code mean? The code P0300 indicates there are repetitive misfires on one or more cylinders in your car. You will often find this code …, 2000 Jeep wrangler Sahara. 185000 miles. Been chasing a P0301 and P0300 (cylinder 1 misfire and random misfire) for awhile now. What Ive done so far. Air sensor, cam sensor, crank sensor, new coil pack, new plugs, checked cat they said it was good, 6 new fuel injectors., Initial problem was a P0300 (random misfire), C121C (Torque Request Denied), and a Catalyst error (don't recall exactly which one). So first things first, we..., A forum community dedicated to Jeep Wrangler owners and enthusiasts. Come join the discussion about reviews, performance, trail riding, gear, suspension, …, Painting the outside of your house yourself can seem daunting, but you can save a lot of money. Learn how at HowStuffWorks. Advertisement A fresh coat of exterior paint can transfo..., Just picked it up on 1-22. Seemed sluggish getting on the freeway as I was leaving the dealer, but I didn't think to check the CEL as it was fine the rest of the way home. (1 hour freeway) Took out for a drive next day and noticed same going up a hill from a stop. CEL flashed several times. Got home and read P0300., 1041 posts · Joined 2013. #14 · Jan 22, 2014. I came accrossthis video, and thought of this thread. Didn't see the update at the time about getting a new head. Hope you get it fixed, but Eric the Car guy mentions that a loose / slipping belt CAN cause a P300 code. Belt and Pulley Basics - EricTheCarGuy - YouTube., P0016 should be considered an important trouble code to diagnose and repair. The crank and cam sensors work in tandem to produce the ideal air/fuel ratio for your engine. When this timing is off, the engine will typically not run (or barely run) Here are the major symptoms of P0016 in the Wrangler: Failure to start. Rattle coming from the motor., 5366 posts · Joined 2010. #1 · Dec 28, 2012. P0300, P0355 & P0339 with stumbling? I'm getting codes P0300, P0335 and P0339. I had to try and start the vehicle two or three times, and it won't rev passed 2500rpm or so (somewhere around there). It just stumbles or rev-limits and won't let it pass that RPM, in neutral or in gear, or in gear with ..., It recently started running rough at 40mph and throwing P2308 & P0300 codes and flashing the CEL. I charged the battery, swapped the coil pack, wires, and plugs. It continues to throw the same codes and also now idles rough and flashes the CEL. ... Jeep Wrangler Forum. 9M posts 468.9K members Since 2005 A forum community …, Any help with P0172/P0175. First got CEL for #1 misfire and#1 injector circuit fail. Replaced all injectors, plugs, and coil packs. Parts from Amazon. Injectors looked like OE. Who knows. Those CELs are gone and now I'm getting P0172/P0175 for running rich., P0300 in Jeep is "Random/multiple misfires detected" And P0304 is a Cylinder 4 misfire detected. My experience has been that these typically mean that #4 is the WORST reporting misfiring cylinder. If you have some mechanical skill, pull the #4 plug and take a look at it., 1041 posts · Joined 2013. #14 · Jan 22, 2014. I came accrossthis video, and thought of this thread. Didn't see the update at the time about getting a new head. Hope you get it fixed, but Eric the Car guy mentions that a loose / slipping belt CAN cause a P300 code. Belt and Pulley Basics - EricTheCarGuy - YouTube., Just picked up my 2019 3.6, used from a dealership. Drove it at least 200 miles without issue. Did notice auto start stop wasn’t functioning but didn’t bother me. Two days ago, I filled it up with fuel. The following day, drove about 40 miles and then got random multiple misfires with shudder..., It recently started running rough at 40mph and throwing P2308 & P0300 codes and flashing the CEL. I charged the battery, swapped the coil pack, wires, ... A forum community dedicated to Jeep Wrangler owners and enthusiasts. Come join the discussion about reviews, performance, trail riding, gear, suspension, tires, classifieds, ..., Third attempt at fixing jeep misfire finally used OEM parts and problem solved.Pentastar 3.6 6 cylinder