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'93 LWB with a history of dizzy/IAM issues. After dis-connecting every part of the remote IAM on the Left fender, cleaning all the corrosion at every point of contact (I thought that was the problem; lots of corrosion where the IAM mounting plate mounts to the fender, and where the engine ground strap and condenser bolt down), removing the IAM itself and cleaning/re-applying dielectric grease to it's contact surface, the probem still persists (tach came back to life, though.....).
It fired up and ran like a top for the first 10 min, then began tomis-fire again at ALL engine and road speeds.
Seems to be occurring when it’s hot, or after a few minutesof running, although during the rough running, it HAS momentarily changed backto running well. Example: After starting it and running beautifully down thehighway for ~6 mi, I pulled off and took a leisurely road @ 40-50 mph, stoppedto look at a used car and left it idling. After idling for ~ 2 min, it began tostumble. Got back in quick and turned around for home, rough-running until Igot to a stop light, where it mysteriously idled fine. Acceleration on thehiway on-ramp was clean, then stumbling again @ 65 mph. Seems to run well onacceleration, but the symptoms are definitely random.
During the rough-running, I can smell un-burned fuel, whichconvinces me this is (again) an ignition problem.
I will probably look at the plugs, but they’re no more than20k old, and the symptoms don’t point to plugs. Wires and coil are new, condenser is OLD and corroded. Could that be it?
How do I test the IAM itself? Do they often go bad?
It fired up and ran like a top for the first 10 min, then began tomis-fire again at ALL engine and road speeds.
Seems to be occurring when it’s hot, or after a few minutesof running, although during the rough running, it HAS momentarily changed backto running well. Example: After starting it and running beautifully down thehighway for ~6 mi, I pulled off and took a leisurely road @ 40-50 mph, stoppedto look at a used car and left it idling. After idling for ~ 2 min, it began tostumble. Got back in quick and turned around for home, rough-running until Igot to a stop light, where it mysteriously idled fine. Acceleration on thehiway on-ramp was clean, then stumbling again @ 65 mph. Seems to run well onacceleration, but the symptoms are definitely random.
During the rough-running, I can smell un-burned fuel, whichconvinces me this is (again) an ignition problem.
I will probably look at the plugs, but they’re no more than20k old, and the symptoms don’t point to plugs. Wires and coil are new, condenser is OLD and corroded. Could that be it?
How do I test the IAM itself? Do they often go bad?