1995 Buick Riviera Engine will not start

AIRPLANE99TR

MEMBER
1995 BUICK RIVIERA

1995 Buick Riviera 6 cyl Front Wheel Drive 100000 miles

This is a Supercharged 3.8 with a new supercharger that has been on the car for 20,000 miles works fine.

Car would shut off periodically but would start right up. Hot cold made no difference. Now it has quit and will not start.
Check for codes non showed a problem. Have spark, and fuel pressure. Checked ignition module and removed to check for corrosion and or grounding problems. Checked injector harness with a noid light, lights did not light on any cylinder locations. Check injectors resistance all check normal, non shorted all with in range. If starter fluid is sprayed into the engine intake the engine will run on the spray.
Anti-theft checks out ok on this model starter and fuel pump would be shut down - they work properly. Will replacing the PCM cure the problem? All else seems to be fine, because I have no codes?

2 Replies

RASMATAZ

MECHANIC
75,992 POSTS

Do you have power to the injector harness connector if so could be the computer's ground drivers or could be the camshaft sensor not telling the computer to snchronize the injectors.

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Monday, September 7th, 2009 AT 3:40 PM

AIRPLANE99TR

MEMBER
2 POSTS

I installed a new PCM and the car started right up.
I shut it off before the engine got warm. Closed up everything that was open on the car, rear seat, PCM access panel, engine compartment. Started the car again, shut it off. Got cleaned up and went for a 40 mile joy ride, car ran great! City streets open road, stop and go a little bit of everything. From 25 MPH to 80 MPH ran better than it ever has. Halfway throught the ride I noted that the traction light was lit, not sure if had been for the lenght of the ride but there it was, lit. I could not change it by pushing the button, this had never been a problem before. Brought the car home pulled into the driveway and shut down and cleaned up the garage. Now the car was still hot and it will not start! I know the PCM has a 'Closed Loop' of operation when the engine is cold and an 'Open Loop' of operation once it come up to temp. (Open Loop, it will take all the engine sense information into account, water temp, O2, ect. I am now waiting for it to get cold to see what happens.
I will check to see if there is power to the injector harness connector. I will also check the harness with the noid lights. Got a feeling I am back to square one!
This car is the pride and joy of my wife who had to work today at the hospital so I took the joy ride to the ER I called and she came out to see the car with one big smile! She just called me and I gave her the news :-( not too happy now. Help!