Hi All

Brief history of the car: Escort Cosworth pushing around 500bhp, T4, 8 greens, swedish inlet, P8 with pectel, ETC.

I purchased this car a week or so ago with a cold running problem (misfiring on number three) which was supposedly a cold start mapping issue due to the fact the ecu was changed to enable the use of Anti lag (not yet been used). So today i put a resistor in where the E.C.T is to fool it into thinking it was warm, but still the same problem.

so as i was under the bonnet with it running (like shit) i could hear a chuffing noise from the inlet plenum, so i'm thinking valve burnt out, anyway i have to go to work at this stage, thinking i'll do a compression test later.

I get home 5 or so hours later and take out the plugs, start to do the test and (bear in mind its a low comp engine). 1=110, 2=110, 3=110, 4=110 and they would hold pressure forever, so i think cool it's a plug or something basic like that, anyway i was sure it was a valve due to the chuffing.

So i decided to test number 3 again, and there was no compression at all this time. WTF is going on.

I kinda have a theory of my own but don't really want to say just yet, because i don't want to influence your diagnosis.

Please let me know what you think

Regards: Bart