we've replaced the crank sensor, the ignition computer, and the whatchacallit that acts as the points (replaced this twice).
The car starts good. runs good at low and high rpm.
but runs like crap at midrange.
plugs, cap, rotor all new. Prior to failure of the ignition computer a couple weeks ago, the thing ran fine so I have to imagine the wires are ok. Besides how could the wires be rpm specific?
Coil? (but it runs OK at lowish and high R's)
Or?
Well - it sounds more like fuel or vacuum because while it may seem to be 'running great' at high RPM's - it could just be leaning out enough to carry the mixture. But either will often trip a CEL (fuel less so because it tries to compensate for fuel octane first).
Have you checked your ERG valve between the manifold and the cam cover as well as the airmass sensor array? Get a fuel pressure reading too, it could simply be a filter or regulator.
After that - it migh be that you have a wrong/bad ignition CPU. 1993 is a weird year.
Sounds like the air mass meter might be giving you a rich mixture. Check the wire inside the meter it is very thin, it could be broken. also run car till warm with meter disconnected after you shut the motor off the wire inside should glow. You might need a second person to shut the car down while you watch the wire it happens fast and for only a few seconds. If wire does not glow you need a meter. good luck papa
MotorsForum website is not affiliated with any of the manufacturers or service providers discussed here. All logos and trade names are the property of their respective owners.