95 Contour GL, 2.0 Zetec, auto trans, all electric accessories, 83k miles
I looked through the achives, and found a thread that addresses the issue I'm dealing with. He even posted that he found the problem, but the link is dead.
Has anyone else solved the problem of surging/bucking/intermittent miss when the engine is warmed up? It runs just fine cold, until it warms to operating temp, then it runs like crap.
I seem to have narrowed it down to a certain rpm range, seems to do it just off idle, at about 1700-2000 rpms. Acts like it's not getting enough gas, but it could also be an ignition miss.
All obvious things have been checked/replaced.
new plugs/wires
new fuel filter
new air filter
new coil pack, as I discovered no. 2 cylinder had no spark when it started this
MAF is clean as a whistle
new TPS
new ECT
replaced thermostat with 180, seems to run a little better
new O2 sensor
no discernible vac. leaks
checked wiring harness for cracks/flaking, looks good, all connnectors seem to be OK
no CEL, scantool says all sensors have good signal/readouts with good waveforms
fuel pressure is rock steady at 40, at all throttle positions
all injectors seem to be working OK
replaced ICM and PCM with pulls from local boneyard
lever position sensor on trans is lined up OK
I growled at it and threatened it with a sledgehammer, but that didn't seem to faze it one bit. I think it even snickered at me.
