Misfire issue which is solved by a restart - spark plugs, leads, coilpack 6 month old

[shiyan]

Had a misfire issue which I solved by changing plugs, leads and coilpack about 6 months ago.

This weekend at the Ring it came back, but strangely enough was never while I was on track during my 22 laps, but often some time after coming off, or after the car had stood still for a while.

I thought that perhaps it was heat related but then on the way home cruising on the motorway it happened again.

Almost each time a restart solves the issue, at least for a while.

Renault dealer with a code reader read the car while the misfire was there and said the car was saying a bad coilpack, but he doesn't think it is the coilpack with how the issue goes away after the restart, but points to the reprogrammed ECU as the culprit.

Would you guys agree?

Another thing is that whereas the immobilizer sometimes would not disarm with one key, it now sometimes refuses to disarm with both keys.

 

[MicKPM]

Re: Misfire issue which is solved by a restart - spark plugs, leads, coilpack 6 month

"Re-programmed" ECM's are easy prey to blame when you do'nt know whats occuring. How exactly has it been "Re-programmed" firstly and secondly are the plug wells dry (No signs of oil and/or water in them)?

Mick

 

[Silent_Scone]

Re: Misfire issue which is solved by a restart - spark plugs, leads, coilpack 6 month

as above, even if the camcover looks relatively clean, check the VVT solenoid isn't leaking as they have a tendency to do so and put oil down well #4

Caused my old lump to misfire intermittently

 

[shiyan]

Re: Misfire issue which is solved by a restart - spark plugs, leads, coilpack 6 month

"Re-programmed" ECM's are easy prey to blame when you do'nt know whats occuring. How exactly has it been "Re-programmed" firstly and secondly are the plug wells dry (No signs of oil and/or water in them)?

Mick

Problem was the programming was done by the first owner (I'm the 3rd), with whom I have no contact. I guess I could try the garage it was done at.

as above, even if the camcover looks relatively clean, check the VVT solenoid isn't leaking as they have a tendency to do so and put oil down well #4

Caused my old lump to misfire intermittently

Guess I'll have to take the manifold off again then :/

 

[KLUNK]

Re: Misfire issue which is solved by a restart - spark plugs, leads, coilpack 6 month

i have the same issue,

i have changed the same things as well

now the car is much better but will still miss ever so slightly and intermittently.

it feels electrical, and a restart will solve it instantly

Just checked the ecu for damaged wire etc and it is fine

any ideas anyone?

OP did you get your fixed?

 

[Fred@BTM]

Re: Misfire issue which is solved by a restart - spark plugs, leads, coilpack 6 month

that'll be a fuel pump problem, doesn't show up on diagnostics, and always thows up a problem after driving flat out

 

[KLUNK]

Re: Misfire issue which is solved by a restart - spark plugs, leads, coilpack 6 month

that'll be a fuel pump problem, doesn't show up on diagnostics, and always thows up a problem after driving flat out

is that answer for me or the OP

FYI mine misfires even when just bimbleing about

 

[Fred@BTM]

Re: Misfire issue which is solved by a restart - spark plugs, leads, coilpack 6 month

not sure on yours, could be MAP sensor

 

[MicKPM]

Re: Misfire issue which is solved by a restart - spark plugs, leads, coilpack 6 month

Pull the MAP sensot, blast it with carb cleaner, dry off the refit and retry.

 

[KLUNK]

Re: Misfire issue which is solved by a restart - spark plugs, leads, coilpack 6 month

Pull the MAP sensot, blast it with carb cleaner, dry off the refit and retry.

excellent i'll give that a try thankyou