Toyota - Prius :: Check Engine Light Came On - Code PO301 / Misfire On Cylinder 1

I have a 2007 Toyota Prius with just under 30,000 miles. Yes, I don't drive all that much, which makes the Prius the perfect car. I get it serviced every 6 months by the dealer. So far, other than oil changes, the only actual maintenance has been tires, a 12 volt battery, and a $300 "inspection".

A few weeks ago the "Check Engine" light came on. I pulled the code P0301, which translated to "Misfire on cylinder 1". The car was running great at that time, and since clearing the code it has continued to run without the light coming on again. Given that my maintenance is more time-related than mileage-related, it's possible that the ignition system needs attention. However I'm reluctant to bring that up at my next maintenance appointment, because the guy writing up the service order will always answer "Yes" to every "Do I need ..." question.

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Accent LC (2000-05) :: CEL Flashing / PO301 Code - Misfire In Cylinder 1

I got a 2002 and its giving ma a po301. I know that means a misfire in cylinder 1. I replaced the Coils, Plugs and wires, and now its still there but the check engine light is flashing. What next?????

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Nissan - Sentra :: Check Engine Light Came On With P0304 Cylinder 4 Misfire Code

(This is a continuation of a previous thread: [URL] ..... )

I have a 2005 Nissan Sentra with 75,000 miles on it. Several months ago (see above link) the check engine light came on with a P0304 cylinder 4 misfire code. The only symptom appears to be a rough idle/shaking every 3rd or 4th start for the first 10-15 seconds, but runs smoothly afterwards. My mechanic replaced all my spark plugs (I had new plugs put it at 50,000 miles for the same issue) of which the one from cylinder 4 was worn down much more than the rest. The problem persisted so they replaced my fuel pump and fuel filter and switched the spark coils from cylinder 4 to a different cylinder, but the code still read cylinder 4 so it wasn't the coil. That was back in October.

I took my car back in last week for the same problem and without starting my car (because the problem is worst on the first start) they pushed my car into the bay and did a smoke test, no leaks in the fuel lines. Then they checked the cylinder and said that there was "excess" fuel in the cylinder and replaced the fuel injector. Then after ~3 days the check engine came back on with the same P0304 misfire code. Previous repairs/diagnostics rule out spark plugs, coils, fuel pressure, and injectors.

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Santa Fe (DM - 2013+) :: Check Engine Light Code P0303 - Cylinder Misfire

I own the 2014 Santa fe turbo 2.0 litre limited which has 4000 km on it. Within 210 km the engine light came on 3 times. I took it into the shop and they ran a code of P0303 which is a misfire, they changed the coils #2 and #3 and cleared the code. The second time it showed the same code but the shop said it was in the history so that is why the same code came up again. They ran an update ECM? and all was good. Now the 3rd time they tell me no code has come up and can't do anything about the engine (they cleared it) but it was like chasing ghosts. My vehicle runs great so not sure why I am constantly having this issue.

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Tacoma :: 2000 V6 Check Engine Light Code P300 / P306 - Cylinder 3 And 6 Misfire

2000 Tacoma v6 has has always ran good, but has check engine light code P300 & P306. cly 3 & cly 6 missfire, lean bank 1. Vacuum test showed no problems.

I've changed plugs & wires, switched coils around cleaned mass air flow sensor, checked timing. Ran Seafoam through intake, and gas tank. Check engine light went out for about three miles, then came back on. What else can I do to keep that blinking check engine light off?

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Ford - F150 :: Check Engine Light Started Flashing / Cylinder 4 Misfire Code

1997 Ford F150 - 133K Miles - 6cyl - 4.2L. This is a truck that gets less than 2K/year put on it. Has had "issues" with worn bearings and holding oil pressure for a few years now. Yesterday, the check engine light started flashing (as opposed to solidly lit) and the code came back as a cylinder #4 misfire (only the one code). The truck was clearly not firing on all cylinders and at idle, ran terribly (couldn't be driven). I just did a compression test on all the cylinders and all measured around 140-145psi except the #4 which read almost 170psi. I rechecked this a few times as well as a couple of the others and am now sure of the results. What could cause this one cylinder to have a higher compression ? Is whatever is causing this increase in the compression, also be the cause of them misfire ?? I'm stumped here and quite frankly, expected the compression on the #4 cylinder to be really low as opposed to the others.

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Ford - Ranger :: 1997 - Check Engine Light On With P302 Computer Code / Misfire On Cylinder 2

1997 Ford Ranger with 190K miles has check engine light on with P302 computer code, meaning misfire on cylinder 2. Engine runs rough at idle only once it warms up, which only takes a minute. It is usually fine while driving, but it's a lot easier to feel a misfire at lower RPMs than at higher ones. Added fuel injector cleaner to gas for a couple tanks, no change. My mechanic has checked spark plugs, fuel injector, o2 sensor, and everything is ok. Dry compression test shows good compression. He thinks it may be a valve sticking, which means a valve job: expensive. Is there anything else that can be done? Why is there no misfire when it is first started?

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Prius (2010-12) :: Check Engine Light On Due To Cylinder 1 Misfire

I plugged in a OBD2 reader and its show misfire on Cylinder 1.

I haven't driven the car for 4 days, and when i started the engine this morning, the engine show knocking when the regular engine kicks in (rough). i will be bringing the car in tomorrow (dealer). my car is a 2011 with 16k miles, strange for this to happen so early in age.

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Audi - A6 :: 2004 - Check Engine Light Intermittently Flashing / Misfire On Cylinder 2 And 5

I have a 2004 Audi A6 wagon that has an intermittently flashing check engine light. I took it to the dealership to have the codes read and they told me that they got codes for Cylinder 2 and Cylinder 5 misfires. Additionally they got a code saying the Engine Coolant Temperature Sender was electronically faulty. What is this part and what does it do? Is it essential to fix it immediately?

The dealership recommended changing the spark plugs and the air filters for the cylinder misfire issue. We are also talking about replacing the timing belt since the car has 105k miles on it. I know there are several other parts that are replaced during the timing belt replacement (like the water pump, thermostat, oil seals, etc). Is it essential to replace these items if there is no immediate need to do so?

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Ford F-150 (2004-2008) :: 2005 - Check Engine Light Came On - Cylinder 5 Misfire

I have a 2005 f150 with 96,000 miles. Long story short, last August I was headed to the mountains going up a steep long hill and the engine light come on. once i was over the pass the light went off. During my 4 wheelin' trip it never came back on until I was headed home and going over another pass and then it stayed on for a couple of days. I had it checked and it was a cylinder 5 misfire. I did some research and found that replacing the coil cover might fix the problem and if not the spark plugs would need to be changed.

I changed the coil cover, problems solved... until I headed to the mountains. light came on and then eventually went off later that day. I didnt think much of it. then a few months later i was headed to the mountains again and the light came on in the same place on the steep incline hill. I. took it back to the shop, same reading. I decided it was time to replace the spark plugs anyways so I would invest. I have new plugs and everything is good however, I had no plans to go to the mountains in the near future. Now, a few months later I headed to the mountains and crossed my fingers it would not come on but it did.

I've done the research again and it seemed like the coil cover and spark plugs are usually the cause of the problem...however I have changed mine. The light is now off again. I don't understand what is triggering the problem and what is really happening and if it is safe to keep taking to the mountains with this happening. I did notice that everything was fine at 60MPH but once i hit the hill and steeped on the gas to go 65 and hit 4-5RMP that is when the check engine light came on...

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Ford F-150 (2004-2008) :: Power Loss / Check Engine Light / Misfire On Cylinder 5 And 6

I have a 2008 FX2 5.4L F150. Recently it began to lose power on a friend driving it out of town. He got a check engine light then it just progressively became unable to produce power. It ran but he got down to 10 mph before he could get to a firestone. I got it to a local Ford dealer and they say i need a new engine. They gave me codes for cam sensor and timing and #5 and #6 misfire. (344, 345)

No oil in radiator, no water in oil. The crazy thing is it runs like the day i bought it in Park. But once in gear it begins to cough and then eventually shudders and dies. I haven't changed plugs ever. I know... At about 75 miles it began to idle rough at times and in reverse. But once I revved up it went away.

I replaced both cam sensors but no luck. Today i put it on a tow truck to get a second opinion from a local engine shop. I actually backed it down my driveway, and pulled up to the tow truck with no issues. weird...

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Honda - Cr-v :: 2001 - Check Engine Came On / Cylinder Misfire Code

I have a 2001 Honda CRV with about 140,000 miles. It is an upstate NY car, so has seen its share of salt and rough winter driving, has a little bit of rust.

I recently brought it in for repairs because it was overheating. It was over the holiday weekend and I had a job interview to get to so I brought it a chain, which was the only open mechanic I could find. They told me there was a coolant leak and replaced the radiator.

The next day, the check engine came on. Cylinder misfire code. I took it back to them and they wouldn't give me a straight answer on what was going on but insist they told me that would happen and it needed more repairs which I had apparently refused. They told me it's probably the spark plugs/wires are old but maybe there's more damage, but basically that they didn't want to deal with it.

So I brought the car to my regular guy. He says, yeah it needs a tune-up. So he replaces the spark plugs and wires etc and gives it back. I drove it for a day and the light came back on. So I brought it back to him again and he refused to do anything. Wouldn't give me some possible causes or explanations, just says come pick it up. Didn't say stop driving it, take it to a dealer, he just reset the check engine light and said its probably fine.

The next time I drove the car, while it was warming up the check engine light was flashing. By the time the engine was warm the light had stopped flashing and was on.

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Ford Ranger / B-Series :: 1996 4.0L - Misfire On Cylinder 3 / Check Engine Code P0303

Got a 1996 Ford Ranger with the 4.0L in it that has a misfire on the #3 cylinder and giving check engine code: P303. Have tried new plugs, wires, distributor, switching out the coil pack with a known good, checked injectors for pulse, checked injectors, moved injectors and still the misfire remains on #3. Removed the valve covers and all appears to be well.

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Passat (B5) :: V6 Check Engine Light - Misfire In Cylinder 4

I'll try to break this down as best I can. I went to my mechanic this am with a check engine light. My suspicion is 02 sensors. This was confirmed as a problem area, but separate they said I had a spuratic misfire in cylinder 4. With that info, i pulled the plug to inspect (I had just installed new ngks in it and they have 18,000K on em.

I put beldon wires on about 8k ago.) plug looked to be normal, but there was definitely a puddle of oil from the valve cover leaking. Oil went into the cylinder head but I didn't really think that was an issue. Nothing abnormal jumped out at me so I reinstalled plug and checked all wire connections at both ends and called it a day.

Then I drove it. Check engine light flashing. Major performance stutters, etc. I drove it for about 20 miles and hoped it was just the oil raising hell in there and it would burn off eventually. It hasn't gone away yet. Maybe coil pack. Can the single portions of that pack be replaced, all i see them sell is the full three as a unit.

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Chevrolet - S-10 :: Check Engine Light Come On / 4th Cylinder Misfire

2000 Chevy S10 pickup

Had the check engine light come on, and when I checked on the code it gave a 4th cylinder misfire. Autozone instructed me to simply replace my spark plug with a new oem plug.

I replaced the spark plug as instructed. After about an hour of driving, the check engine light goes off and I think, great! Problem solved. However, another hour of driving and the check engine light is back on again, without going away.

I headed back to autozone to get a readout, just to find that it's the same code. So I put another spark plug in. Same result - check engine light goes off after an hour, only to come back on again permanently after another hour.

Now, normally I would think, this must be the spark plug line that needs replacement,however I am sure there must be some clue in the fact that the check engine light turned off for an hour.

By the way, not sure if relevant, but I also found a lot of build up around the spark plug before I initially changed it.In fact, there was so much that I had to scrape around the plug with an awl, and blow out the crud with a compressor,just to get my socket into place without there being crud in the way.

Any clue what that check engine off/on clue might be?

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Passat (B6) :: Check Engine Light - Cylinder 4 Misfire

Got the flashing check engine light and loss of power for few seconds and then the light stayed still, from time to time it blinks for few secs, usually when I push the gas pedal little bit more but it stays still, flashed only twice in 2 days for seconds. I connected computer (not VAG) and it says "Cylinder 4 misfire". I have app scheduled with my mechanic this Thursday, but still need to commute to work. Is it safe to drive?

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Elantra XD (2001-06) :: Check Engine Light (cylinder 3 Misfire)

As the title says I have plugged a code reader in and it says "cyclinder three misfire". So I pulled the plugs and good god they were nasty. Some having a gap of 80-90 thousandths of an inch. So I figured the plugs were the source of the problem, thus I replaced them but to my dimise the check engine light is still on, and still reading the same ol' "cyclinder three misfire". I have put 350 miles on it in 24 hours of changing it to allow for proper time of the circuit cycling for the light to change but not sure if it takes longer...?

I also went ahead and checked the plug wires resistance when I had the plugs pulled and they ranged from 1.5-2.5k ohms shortest to longest (cylinder 4-1). And if your curious the magic cylinder three was around 2k ohms for however long that wire is, my guess would be 18 inches. Would this be out of tolerance, I know the norm is 10k ohm for every 12 inches or so...?

My next guess would be replacing the power pack or I guess you car guys call it the "ignition coil"...? I will say that the car does run much smoother after replacing the plugs.

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Honda - Odyssey :: Cylinder 4 Misfire - Check Engine Light

Honda Odyssey 2005 – 176000 miles. Cylinder 4th Misfire – check engine lightHonda has about 176000 miles. When cold – before warming up – it acts like nothing is wrong – as it gets warmer – to the middle of the temperature gauge – it misfires.And runs rough. Evaluation: Honda Dealership thinks it is a cracked Valve or needs adjustment – they have replaced a spark plug and swapped coils. Not for sure.They think if that is not the case then there could be additional problems.Question: Why does it act normal when cold ? How can we confirm if it is the valve and not cracked head?

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Ford Excursion :: Check Engine Light And Cylinder 5 Misfire

So when I bought the car, it had a check engine light. I had it checked it said cylinder 5 misfire. I assumed it was the glow plug so I bought it and replaced the glow plugs myself. Check engine light went away for about a day then came back on. Got it checked again and still said cylinder 5 misfire. This is my first diesel and I'm clueless as to what's wrong.

2001 7.3 Limited with 232k miles Bergen County NJ.

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