Well Im stumped. I replaced the center brace, got the ECU rebuilt, replaced all fuel injectors, timing belt, had valves looked at and anything else I could think of. The good news is the ECU rebuild fixed the ISC fail/sporadic behavior. The rpms are high at cold start up and adjusts as the AC compressor kicks in and out and temp comes up and I have no vibration in gear. But as soon as the engine is warm the vibration in gear is back and is exacerbated as AC, lights, brakes or steering are engaged at normal op temp. It idles smooth as silk out of gear and warm but starts vibrating in-gear under any kind of load but only in gear.
Ive notice the head lights dim as AC is put on when in gear. Idle has been set with code scanner (no code - no check eng light) to factory specs.
Could it be a sensor or switch in the gear selection housing? Or the alternator? It happens in every gear and I mean as soon as I shift into a gear (auto trans). Sometimes it smooths out a little - usually when the AC compressor kicks in or if I put it on a high setting (more blower) and rpms come up.
Engine temp sensor checked out ok. The only other thing Ive noticed is despite a new thermostat the temp gage still shows the normal op temp running a little above the normal hash mark. I am at a loss for what to do next. Thanks again.
Wednesday, August 21st, 2013 AT 5:26 PM