Performance problems, misses and stalls
06-08-2022, 10:17 PM
#1
2nd Gear
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Performance problems, misses and stalls
I have a 1992 LT1. At 40,000 miles the engine started to miss and then stall. It seems that this happens when I drive for about 10 miles, let the car sit for a few hours and then begin to return. It does not seem to be a fuel problem. I have been told it could be a distributor problem. I would like to see if there are any other suggestions.
Thanks for your help.
Thanks for your help.
06-09-2022, 12:23 AM
#2
Racer
It could be your opti distributor but you should check for any codes that are set first. Check the fuel pressure and report here. You can rent a fuel pressure gauge kit from a auto store if you don’t have one. 92&93 EMC computers also have had problems with their solder joints and can be fixed by reflowing them.
06-09-2022, 07:36 AM
#3
Burning Brakes
Sounds like an opti problem
06-09-2022, 08:48 AM
#4
Team Owner
Pro Mechanic
Guesses are awesome....but how about some testing? 
KMS88Cal#16 is right to check things, definitely fuel pressure, especially when the symptom is happening. The fastest/easiest way to check the opti is to simply see if you have a tach signal when the symptom occurs. There are two ways (at least) to check this; 1. Get your hands on an OBD I scan tool and monitor Data stream, RPM when the symptom happens. If it's the opti, then you'll have no or erratic tach signal (RPM) showing on the scan tool. Another way to check is when the engine cuts out, try to monitor your tachometer while then engine is still in gear, car moving. Obviously, with the car moving in gear, the engine is still turning and thus the tach should display a believable reading. If it shows zero or is bouncing around, you've got a problem with the signal from the opti.
SO; I do as KMS88Cal#16 suggested and hook up a fuel pressure gauge, a scan tool or be ready to watch the tach carefully, then go drive the car and make it die on you. Look for fuel pressure falling off or a loss of a tach signal.
KMS88Cal#16 is right to check things, definitely fuel pressure, especially when the symptom is happening. The fastest/easiest way to check the opti is to simply see if you have a tach signal when the symptom occurs. There are two ways (at least) to check this; 1. Get your hands on an OBD I scan tool and monitor Data stream, RPM when the symptom happens. If it's the opti, then you'll have no or erratic tach signal (RPM) showing on the scan tool. Another way to check is when the engine cuts out, try to monitor your tachometer while then engine is still in gear, car moving. Obviously, with the car moving in gear, the engine is still turning and thus the tach should display a believable reading. If it shows zero or is bouncing around, you've got a problem with the signal from the opti.
SO; I do as KMS88Cal#16 suggested and hook up a fuel pressure gauge, a scan tool or be ready to watch the tach carefully, then go drive the car and make it die on you. Look for fuel pressure falling off or a loss of a tach signal.