BMW 318i hesitation, help!?!

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Fri 6 Feb 2004 09:46
BMW 318i hesitation, help!?! - Sirblofish
Okay, the story so far:

I changed the cylinder head of a BMW 318i after buying it off someone who had overheated it. Turns out that a valve seat had come out of place and so I bought a second hand cylinder head, skimmed it and put it on... Voila!

Car started second time after everything was put back together and I was initially quite pleased with my efforts. However.....

Now I'm driving it around and I get this really annoying slight hesitation that occurs when I'm accelerating fairly lighltly but with load, i.e. slightly up hill, and I can't for the life of me figure out what it is.

I've added 3 lots of injector cleaner, changed the plugs, air filter, in-line fuel filter and it's still happening!! Some guy test drove it the other day and he's dead keen on buying it. Luckily he didn't notice the hesitation but I wanna get it fixed for my peace of mind.

I've taken it to my fall-back mechanic who checked the emissions and determined that the mixture was fine and he couldn't think what it could be.

I was thinking maybe the ECU and if so, is it possible to 'reset' it?

ANY ideas would be greatly appreciated...

Cheers,

Steve
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Fri 6 Feb 2004 09:53
BMW 318i hesitation, help!?! - Aprilia
Misfire under load is most likely ignition system (HT) related, although it could be other things too. But I would check out HT system first.
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Fri 6 Feb 2004 13:54
BMW 318i hesitation, help!?! - Sirblofish
Thanks for your input.

HT would include the entire ignition system yes? Is there a part of the HT system that is more likely to go then the rest?
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Fri 6 Feb 2004 14:28
BMW 318i hesitation, help!?! - kal
My 318i suffered from a failed air mass sensor, symptons were flat to weakish acceleration and hesitancy especially when cold....

Rgds,

Kal
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