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My 1984 Corvette Crossfire automatic is running actually pretty good but.... When I come to a stoplight and sit for the cycle I get a distinct miss. It isn't a repetitious steady miss like a spark plug but like for a split second it is missing complete spark or possibly fuel. Any other running is smooth, starting cold, taking off from the stoplight after the idle misses and cruising. I tried another ECM but no difference there.
One thing I did see in a youtube video was checking the resistance on each of the 2 injectors. I remember him saying .14 ohms as a standard, stock measurement. His were .15 but equal and mine are .17 but equal. I have rebuilt the injectors as far as seals go and cleaning. a few years ago. Between 9 to 12 lbs of fuel pressure. These cars are old, especially the crossfires so diagnosing is tougher since I don't know anyone close by with one.
So, any direction would be welcome. I have cleaned all the grounds in the car and replaced many but not all of the connectors to the injection system. I don't know if unplugging an injector while running is an option to see if it makes the same type of miss? Wiggling the wires to the distributor doesn't bring out the miss but not ruling out the spark.
I appreciate the video. My pvc and grommet are fairly new. I have no vacuum leaks. It seems my car idles in Drive at around 650 rpm and same with the A/C on. If it idles around 700, it seems to run steady. I rebuilt the throttle shafts a few years ago so they are smooth and tight.
I watched a video that mentioned a low voltage correction system in the ECU. His problems were with his grounds. He checked every wire he says, in the video. Said that if the power to the ECU was low is would try to compensate. I know mine is charging right and the battery is good. My gauge though says 13.2 and the temp is all over the place on the dashboard module, even a red light saying it overheating (which I know it is not) and not sure why since the same switch controls both readouts.
Its like someone is flicking the off switch really quick in the way the car stumbles at idle, warmed up and in gear. Cruising is fine, as soon as I step on the gas, it goes just fine, no stumble or hesitaion. So I thought there might be a few out there who have felt this, probably electrical and had a few ideas.
Coolant temperature gauge all over the place could be a problem. Scanner would be handy. Vacuum leaks include plenum gasket. CFI isn't going to run well on 1 injector. You can use timing light to observe spray pattern.
1984 crossfire missing at idle
