rob249
OBS Enthusiast
Truck 94' GMC Yukon, It has had a miss at idle for years, runs perfectly at any rpm above Idle. Every year or so, I attempt to fix it.
I launched a "Special Vehicle Operation" against this time. Replaced every possible problem. I've cleaned and resealed the TBI, new distributor, new 8mm plug wires with ceramic boots, new coil, new properly gapped plugs, new O2 sensor, new vacuum lines, new ecm ground wire, new PCV valve and grommet.
I have also set timing to 0* with the advance wire unplugged, reset the base Idle(IAC) to 600rpms following the proper procedure. Literally all sensors have been replaced in the past year. EGR is 2 years. Fuel pressure is 11-12 psi steady
Idled smooth as silk for about 2 days, now it randomly misses yet again. Its never stalled, but its infuriating.
Anything else I can try?
edit: TPS, IAC, coolant sensor are around 3 yrs old now. At the time these were replaced, they had no affect.
I launched a "Special Vehicle Operation" against this time. Replaced every possible problem. I've cleaned and resealed the TBI, new distributor, new 8mm plug wires with ceramic boots, new coil, new properly gapped plugs, new O2 sensor, new vacuum lines, new ecm ground wire, new PCV valve and grommet.
I have also set timing to 0* with the advance wire unplugged, reset the base Idle(IAC) to 600rpms following the proper procedure. Literally all sensors have been replaced in the past year. EGR is 2 years. Fuel pressure is 11-12 psi steady
Idled smooth as silk for about 2 days, now it randomly misses yet again. Its never stalled, but its infuriating.
Anything else I can try?
edit: TPS, IAC, coolant sensor are around 3 yrs old now. At the time these were replaced, they had no affect.
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