History of the car. It is a 90 LS with a B20b swap I got for nothing. The kid that had the car could not get it running. I have rebuilt the distributor (new coil and ignition module) and repaired the ground to get it running. I found the engine had jumped timing, replaced the timing belt, water pump and tensioner. The engine was over heating, traced down the source to a clogged radiator. A week after I replaced the radiator, the head gasket blew. Surfaced the head and replaced the gasket.
Currently, it dies when you are decelerating and does not want to restart. You can smell fuel. It has been running rich and fouled a set of spark plugs. Injector #3 was not spraying properly, so it was replaced. I have put a B&M Fuel Pressure Modifier on it to reduce the fuel pressure. The check engine light comes on from time to time and the only code it is giving me is for the O2 sensor. The O2 sensor I replaced with one from my other car to test. The code still comes back with the other O2 sensor. At idle the car has a stumble, but under load runs smooth. As long as you can keep the RPMs around 1500-2000 range it runs fine.
Any suggestions? I cannot give up now it is a matter of pride, so please help!
i’d say check the vacuum hoses and the fuel pressure regulator. also if it doesnt turn on after it stalls then it could be the main assembly relay. i had a similar issue where my car would almost stall while coming to stop and it turned out to be that my fuel pressure regulator had a bolt loose. after tightening it its been running fine.
I swapped the main relay from my turboed DA and the one from this car is in the DA now. It runs with no prob on the DA, DB1 still dies. I dig up the stock regulator from the DA and put it on there, doing the same thing!
What ECU are you running?
Is the ecu chipped/mapped for another motor?
Have you tried another ECU?
:iagree:
Sounds like ignition timing, or it’s a tooth off on mechanical timing. Try advancing and retarding the distributor to bring it back into correct ignition timing.
Update, last time I tried to get on here at work, I was blocked. Got internet at home now so I am good to go. Stock PR4 ecu no chip. new coil and ignition mod. I installed a fuel pressure gauge and found that the fuel pressure is dropping when it stalls. Replace the fuel pump and filter, swapped injectors again and still having the problem.
Set the timing with a timing light.