HEY! Don't knock the older generation, I'll bet i'm older than you are.
Question: Have you recently gotten a "check engine" light while the motor was running? This is important!
The "idle speed control" (ISC) adjusts the engine rpm's to compensate for added load ie. A/C compressor, high blower fan, power steering, etc. They are prone to get carboned up and not functioning properly. They can be removed and cleaned with carb cleaner. The computer will detect if the unit is bad but, not if it's dirty.
The TPS (throttle position sensor) tells the computer how hard you stepping on the gas.
The MAF (mass airflow sensor) tells the computer how much and what temperature air is going into the motor. If any one of these is defective or "out of range) it will log a trouble code into the computer and trigger the check engine light, even if only for a second or two. This is why if have had a check engine light, even for a few seconds, is so important.
You mentioned compression is 140. Is this on "all" cylinders?
The injector pulse is triggered by the computer just after a cylinder starts the intake stroke. Controlled by the CPS (crankshaft position sensor). The length of the pulse (the amount of fuel) is controlled by the TPS. BAD OR DIRTY injectors will cause a motor to stumble on acceleration.
Monday, October 13th, 2008 AT 10:59 AM