Misfire

[nick92S2]

Hi,
My engine misfires when I rev it immediately after starting from cold. I gently build up the revs to 4-5000 let the engine idle for a moment and then it's fine. The engine is fine under load etc and goes well enough!! What do you think?

[S2central.net]

Could well be a leaking injector which is allowing one or more chamber to fill with fuel...

I replicated this behaviour on mine recently when doing some injector testing such that I had a few half second shots of fuel into some chambers. The following morning had such a troublesome start and I had to hold about 3000 rpm for a little while before things settled down.

[zlobo]

can also be the maf

[audiman]

You shouldnt be revving it from cold start anyways!! LOL Sounds like a leaky injector either that or a contaminated plug? Any loss of oil or water??

[nick92S2]

You shouldnt be revving it from cold start anyways!! LOL Sounds like a leaky injector either that or a contaminated plug? Any loss of oil or water??

Thanks for the reply.
I've checked the oil and water and both are ok. I will change the plugs though. If it is an injector how do I find out which one it is ?

[audiman]

have them tested by a bosch agent or the like. they can test spray pattern and leakage etc, expect to pay about 20 per injector.

Or when cold crank engine briefly, then shut off. Remove the plugs and see if one is wet with fuel. Maybe worth a try