The timing was off one tooth on each cam in different directions. I was about ready to pull the engine and thought the timing was the only thing that hadn't been triple checked. I still don't know why it was running smooth when cold. Strange.
Happy Ending!
Background: I swapped a 92 2.2 and 5sp into a 93 that had a bad auto trans. Note: the 92 engine and 5sp did come out of a car with a front end wreck and I could not check it prior to installing it in the 93. I replaced the cam and crank sensors when I did the TBelt.)
The 92 engine runs fine prior to getting all the way up to temp (below 1/2 way on the gauge). Once its to temp, it will not idle and runs rough, like its missing. The temp stays below 1/2 always.
I've been through things may times, checking and rechecking. What am I missing??????
The only indication I have is #4 is running clean, 1 2 & 3 are rich, as indicated by the plugs.
Things I've done and checked:
Compression cold and hot 140 all four (good for 6500' CO Alt.)
New timing belt (runs fine when cold so timing is good, I believe)
Swapped coil pack, wires, and plugs with a good 2.2 no change on either car.
Changed Map Sensor, Mass Air Flow Sensor, MAP Sensor. no change.
TPS checks out for resistance and power, with in limits.
O2 sensor has good cross over once hot 0.2 to 0.8, and when cold its a steady .33 ohms.
Swapped out fuel rails, complete with injectors, no change.
The engine runs great when cold. With the good compression, I believe its a good 2.2. What am I missing???
I'm about ready to stick the high mileage (250K) 93 motor back in, but it would really bite to have this be an electrical problem.
Thanks for the help in Advance
It may be the Intake Air Control Valve. If you have a manual, it tells you how to check it. Once the car is warm, it has little effect on the engine. Good Luck.