Rough running.... any ideas?

[moschops_72]

Hi,

Well, since getting my Chim back from a service it's been running none too well...
on tick over it's fine... not a problem, apart from the usual "lumpy" feel under 2,000 RMP, no doubt due to a more agressive cam.
1st and 2nd gears are fine, throuought the rev range, but 3rd, 4th and 5th are, for want of a better word, stuttery...

any ideas?

thanks in advance,

Jeff

[beano500]

Are all your HT leads on securely?

[moschops_72]

yes, HT leads are all on, and secured... new leads and shrouds was 1st on the list... looking for 2nd thing to do.

[2 sheds]

Jeff
You mention "more aggressive cam" does that mean you've just had a different cam fitted ? if so it would need a fuel re-map to run smoothly.
Tim

[moschops_72]

Tim,
I had an engine rebuild with new cam in december 03.
all was running fine, then had service done in May time... since then it's been distinctivley rougher, as i remember, it was like that once i got home. it's VERY noticeable. I'm not mechanically minded, so i don't really have a clue, but yes, i know i'll need a re-map and a rolling road session. Thing is, i really do doubt that doing that would solve the problem, as it is so pronounced.
It's almost like a severe loss of power, as if i'm running on 5 or 6 cylinders. 1st and 2nd gears are fine, no problems at all, it's just when i get in, or above, 3rd gear. Very lumpy, i'd say almost the same sort of symptoms and running out of fuel... you know, almost a kangaroo effect, just not as extreme. Definitive power loss is felt though.
It was running as smoothe as the proverbial babys bum before the srevice... it's just extremely frustrating, as i can't play with the other cars on these lovely german autobahns
i'm more inclined to think maybe a temp sender of sorts, or some other electrical part has failed as it seems to be slightly more pronounced as the car gets to correct operating temp. Remember, i warm up my Chim as it's supposed to be, and only have semi nailed it in 1st and 2nd when at the correct operating temp.

:scratchingmyheadandgrittingmyteethinfrustration:

Jeff

[iandbeech]

Mines got a slight stutter under 2k - since a service and new manifolds. Haven`t been too bothered by it but might get round to cleaning the Stepper motor.

[chris547]

When they did the service the reader will display fault codes for every sensor not working properly. See page 94 of the Bible.

So no need to scratch your head just get a read out from the ECU

Think there are about 7 and they are not cheap to replace.

Chris

[peteruc]

Does your MIL light on the dash flicker on at all when the car judders. If so you may have a conection problem with your ECU. I had a similar problem with mine, very intermitent and it was a poor conection on one of the pins.
Pete