Rev dip issue

Dear all

Finally got the car back today. The problem would appear to be solved. All they did was replace the non-OEM spark plugs for OEM spark plugs. Now from warm idle pulling away with light throttle it no longer wants to stall.

Unfortunately they couldn't machine polish out the tiny splatter marks in the paint which are visible in certain angles in sunlight. However they didn't charge me for this: interesting one - they said because when I brought the car in I said "Sort these marks out" and they suggested they would easily polish them out they won't charge me. If I had told them the solution was to polish them out and do that they would have charged me! Anyway its going back to their body-shop next month to have the bonnet resprayed. Estimated cost 400 euros but they will give me a written quote before hand.

I'll keep an eye out for the weekend and see if any problems return but fingers crossed in my case it seems to have been a simple issue

Thanks everyone for all the advice as usual
Sam.
 
ph001 said:
I'm amazed that was caused by plugs. Learn something new every day.
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Hi - to be honest I share your amazement! I would never in a million years put that issue down to plugs. I can only report back as I have the car now. So my caveat would be I have only driven it once for about 20kms since. Maybe the demon will return tomorrow .... I hope not. I will of course report back so nobody is sent in the wrong direction by my "solution" if it turns out not to be in fact a solution.

Sam
 
Thing is people think a plug is a plug

They have running temps and set working range plus pre gapped and different cores
So if not OE used God knows what some Muppet had put in it as too hot or too cold a plug it wont fire how the cars set up to do:)

Never will understand why people buy performance cars with a budget to run it on of a 1ltre car
 
Hi guys sorry I can't I should have asked but didn't. In my defense I literally arrived back to Gibraltar at 12 and was picked up my a friend went straight into Spain to pick the car up. Have just checked now and they didn't leave the old plugs in the boot.

On a good point I drove the car this morning gave it a good work out and no issues again

Since it's going back again for front end respray soon I will ask and see if he remembers
 
I bet they reset the dme too.

That clears the problem for a while and then it gradually comes back as the ecu learns to adapt to whatever is causing the problem in the first place.
 
Lower said:
I bet they reset the dme too.

That clears the problem for a while and then it gradually comes back as the ecu learns to adapt to whatever is causing the problem in the first place.
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Maybe. But its been good for a week now so it must be a slow learner like me!! :D
 
NavZ said:
Mine had the same problem, couldn't find the fault.
When the service was due and sparks replaced, it went away :thumbsup:
As mentioned before, it seems to be caused by different things for different cars.
I'd start with cleaning the ICV and doing normal (relatively cheap) service items so that the car benefits whether or not the issue is resolved.
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Called it :poke:
 
Mine used to do this regularly and it was quite annoying, I just got used to it and would use the accelerator in a more progressive way when driving. When you stop and think about it you would never be able to induce this "fault" whilst driving the car anyway.
 
Fingers crossed for you.

With my car it takes about 3-4 weeks after a dme reset for the symptoms to become noticeable again.
 
Lower said:
Fingers crossed for you.

With my car it takes about 3-4 weeks after a dme reset for the symptoms to become noticeable again.
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Thanks - well I have nothing but time I guess.
 
What is strange about this issue is that changing things unrelated to the problem seems to do something to the DME that resolves the problem for a while.

I had my ABS pump refurbished and when that was refitted the problem went for a while. As it did when i cleaned the ICV and when the DME has been reset at a service.

The problem goes for a while and then gradually creeps back. Really frustrating as on each occasion you think its fixed....
 
Lower said:
What is strange about this issue is that changing things unrelated to the problem seems to do something to the DME that resolves the problem for a while.

I had my ABS pump refurbished and when that was refitted the problem went for a while. As it did when i cleaned the ICV and when the DME has been reset at a service.

The problem goes for a while and then gradually creeps back. Really frustrating as on each occasion you think its fixed....
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To be honest thinking outside of the "M car" box - changing bad plugs (or coils in the case of the other similar thread) is not really unrelated to the problem. I am not saying I have cracked the case on the rev dip issue - its very possible that the DME is as you suggest just relearning around the problem and it will return. To give a comparison, I race a Hyundai in a one-make series. This thing all of a sudden was very slow starting which is a big problem on the grid where you have to turn the engine off between the 5 and 1 minute sirens. I was convinced it was a fueling issue. Changing coils and leads - completely solved, fires up on the button. Point being bad leads, plugs, coils all will cause some kind of rough running, misfire, hesitation etc.
 
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