Misfire

[stallion.ru]

Hello colleagues,

my Check Engine light came up and I used Durametric to identify error codes - those are P0300, 301-306. My serviceman suggests to replace all sparks and ignition coils - which I feel is quite costy...and may be useless.

Also, there must be a different cause - maybe fuel pump? Why would all cylinders misfire simultaneously?

Thank you very much in advance and regards from Moscow,

Vladimir

[BillTurbo]

I have a 2002 911 TT with misfire in cylinders 4, 5 and 6. It is still in the shop but those ignition coils are being replaced -- they had electrical resistance too large. Also replacing all the spark plug since at 51k miles it close enough to the next service interval. I will let you know when I learn more.

4pm/pt The new coils did not solve the problem. Check engine light came back on during test ride. More news in 24 hours.

Edited May 12, 2009 by BillTurbo

[Loren]

Model and year of your car please...

[phillipj]

How many miles are on your car? Seems unlikely that you would need plugs and coil packs if you have low mileage. I would think you would have to use the Porsche PIWIS tester to diagnose the issue further.

Edited May 12, 2009 by phillipj

[stallion.ru]

I have a 2002 911 TT with misfire in cylinders 4, 5 and 6. It is still in the shop but those ignition coils are being replaced -- they had electrical resistance too large. Also replacing all the spark plug since at 51k miles it close enough to the next service interval. I will let you know when I learn more.

Thanks a lot Bill,

the problem is that I have all 6 cylinders misfire. Happens not too often - every 2 months or so...anyway - appreciate any news!

Regards,

Vladimir

[stallion.ru]

Model and year of your car please...

It's a 2005 MY 997 - manual with 3,6l 325 hp - as simple as possible ;-)

[stallion.ru]

How many miles are on your car? Seems unlikely that you would need plugs and coil packs if you have low mileage. I would think you would have to use the Porsche PIWIS tester to diagnose the issue further.

Well it's 70,000km - which is less then 45k miles...my concern is that all coils or plugs just can not go down simultaneously - and when I clear the error code it takes me another couple of months to see it...

Regards,

Vladimir

[phillipj]

Interesting..... Perhaps Loren or RFM (moderators) can give some advice here. Perhaps the inclement weather in Moscow could attribute to your coils going bad. I always wanted to go to Moscow. Perhaps I'll fly out and give you a hand with the fix! :cheers:

[stallion.ru]

Interesting..... Perhaps Loren or RFM (moderators) can give some advice here. Perhaps the inclement weather in Moscow could attribute to your coils going bad. I always wanted to go to Moscow. Perhaps I'll fly out and give you a hand with the fix! :cheers:

Welcome Phillip! I cannot promise good weather or real big PorscheClub events - we've had too many Porsche clubs since I had my first 924 - but showaround is guaranteed ;-)

[phillipj]

:clapping: :clapping: :clapping:

[Loren]

A misfire on all cylinders begs to question the quality of the gasoline. How is the gas there?

When misfires occur on both banks:

- Incorrect/low-grade fuel

- Tank empty

- An engine-block heater is used

- Secondary air

- Exhaust system blocked/narrowed

- Foreign bodies in intake tract, this can lead to sporadic misfires on changing cylinders.

[BillTurbo]

A misfire on all cylinders begs to question the quality of the gasoline. How is the gas there?

When misfires occur on both banks:

- Incorrect/low-grade fuel

- Tank empty

- An engine-block heater is used

- Secondary air

- Exhaust system blocked/narrowed

- Foreign bodies in intake tract, this can lead to sporadic misfires on changing cylinders.

-Exhaust causing misfire:

The current guess for my 2002 911 TT (see above) is the misfire may be due to blocked exhaust (broken or plugged cats ?). Removal of test plugs before the cats allows car to run without misfire. Put plugs back in and misfire occurs. Car still in shop now.

UPDATE: the cats are ok. The dual-mass flywheel is not. The spring connecting the two parts of the flywheel is allowing too much flex. The timing pick-up is affected by this and so the computer puts the timing to zero. And this leads to a misfire(?). Will post after flywheel replacement.

Edited May 14, 2009 by BillTurbo

[ekoam]

Hello colleagues,

my Check Engine light came up and I used Durametric to identify error codes - those are P0300, 301-306. My serviceman suggests to replace all sparks and ignition coils - which I feel is quite costy...and may be useless.

Also, there must be a different cause - maybe fuel pump? Why would all cylinders misfire simultaneously?

Thank you very much in advance and regards from Moscow,

Vladimir

Hi,

2005 C2S owner here, I had same CEL misfile and dealer could not find any issues with the sparks or coil pack. After three visits with same CEL, they found out that it was camshaft alignment was off.

Good luck.

[stallion.ru]

Thanks gentlemen,

reset the error with Durametric - no return of the issue so far... could be the poor gas quality.

Regards,

Vladimir

[bob703050]

Just suffered the same fault on my C4S. Replaced plugs & coil packs, missfire persisted. Checked & cleaned air flow meter, no improvement. Took into OPC who first checked vario cam sensors - no fault found. They then went through a process of swapping parts from a donor car and eventually traced the fault to a faulty valve lifter solenoid. Parts weren't much but 4 hours labour at OPC doesn't come cheap.

[tekky]

Hi Guys,

I'm re-opening this thread as I seem to be riding the same ship as you are or have been on:

- My engine blew up in sept 2009 on the track (MY05 IMS) and porsche provided me with a MY06 engine free of charge, cost me $6k in labour to replace etc, and got a 2 year full warranty on engine (link to complete story here)

- Two weeks after I got the car back (4 weeks later), my check engine light came on. So back to OPC I went, car was looked at, they told me it is a cylinder misfire, and it is normal for new enginers and that I should keep driving the car under 4k rpm as I have had for the prior couple of week. They reset the light and gave the car back to me

- few weeks later, light comes back on, I can paste the last point 6 more times for you guys with reasons varying from: - oil cap was on wrong (nobody had touched the oil cap but the OPC), more misfires, may be your flywheel slipping or being misaligned, could be your crank shaft being misaligned, could be your coils/plugs, your ECU/computer needs to be reprogrammed

- so far I have swapped all coils/plugs, reprogrammed the computer, and also I have a brand new clutch as well as flywheel put in the car which was not cheap and the misfires persist

The car drives beautifully and no mechanical or performance issues are present what-so-ever. I read in the last post regarding "faulty valve lifter solenoid" ? should I bring this up with the OPC? is it normal to take the OPC over a year and with so much additional costs to me? Where is my warranty? this issue did not exist prior to engine swap. The issue happens for me in one bank only and the fuel compensation to that bank is slightly different than the other. I could provide more PIWIS info if required.

Any help is appreciated

Tekky

Edited November 12, 2010 by tekky

[Loren]

Hi Guys,

I'm re-opening this thread as I seem to be riding the same ship as you are or have been on:

- My engine blew up in sept 2009 on the track (MY05 IMS) and porsche provided me with a MY06 engine free of charge, cost me $6k in labour to replace etc, and got a 2 year full warranty on engine (link to complete story here)

- Two weeks after I got the car back (4 weeks later), my check engine light came on. So back to OPC I went, car was looked at, they told me it is a cylinder misfire, and it is normal for new enginers and that I should keep driving the car under 4k rpm as I have had for the prior couple of week. They reset the light and gave the car back to me

- few weeks later, light comes back on, I can paste the last point 6 more times for you guys with reasons varying from: - oil cap was on wrong (nobody had touched the oil cap but the OPC), more misfires, may be your flywheel slipping or being misaligned, could be your crank shaft being misaligned, could be your coils/plugs, your ECU/computer needs to be reprogrammed

- so far I have swapped all coils/plugs, reprogrammed the computer, and also I have a brand new clutch as well as flywheel put in the car which was not cheap and the misfires persist

The car drives beautifully and no mechanical or performance issues are present what-so-ever. I read in the last post regarding "faulty valve lifter solenoid" ? should I bring this up with the OPC? is it normal to take the OPC over a year and with so much additional costs to me? Where is my warranty? this issue did not exist prior to engine swap. The issue happens for me in one bank only and the fuel compensation to that bank is slightly different than the other. I could provide more PIWIS info if required.

Any help is appreciated

Tekky

Current fault codes would be good place to start.

But certainly if you still have warranty on the engine take it in and at least get them to document the problem. That is what I would suggest...

[tekky]

I have done that 7 times in the past year! they know the problem is persistent! I will get you the codes this week.

here's something new, could this be related?

Tekky

[Ubertune]

Hopefully you have solved the issue by now, if you haven't I recommend replacing the crankshaft position sensor. Porsche dealers and mechanics will tell you that this part rarely dies, however it has happened to me. The part reads the flywheel and picks up a magnetic frequency and adjusts timing from the CPS. If it faults, it will limit fuel and retard the timing on the bank that it faulted. There are 4 of these sensors, typically the two in the back of the motor (closest to the front of the car) are the culprit. They are less protected and receive more heat. When I changed mine on the 996 I noticed how brittle the wires and the plastic were. Additionally the sensor was almost fused to the head. I hope this helps.