95 Buick Riviera will start then die after seconds. changed fuel pump,evetytime I do it runs good for a lil but then it dies again and won't start, fuel filter, maf sensor. But on the new maf looks the same but the back reads c09, my old maf sensor reads c10.I don't know if that would be an issue but anyway I jumped the fuel pump at the relay kept it running while I started it still nothing.I have spark untill the engine stalls on all cylinders.pulled vacume line off pressure regulator no sign of fuel.fresh tune up about 9000 miles ago.replaced crank sensor same time.replaced supercharger 2 years ago.cam sensor replaced two years ago.battery altonator and starter fine. There is a code can't read due to the fact I has a obd2 plug but it is set up for obd1 pins are different then obd1 can't figure out how to jump it.have not tested fuel pressure.help I'm screwed without old betty let me know what else I can do would it be a

SOURCE: buick lesabre nightmare

Need to get a scan tool and look at the data stream while it is running for alot more info.Also any trouble codes.Sounds like initially,the engine isn't getting any fuel.I would have a pressure gauge connected to the fuel rail on the engine,so i could monitor the fuel pressure while all this is going on.Items to look at on the data stream would be timing,what timing is the PCM commanding for the engine.Also,have you checked for continuos power feed to the coils during this no start condition,and fire at the plugs while cranking.You could possibly still have spark,but maybe it is extremely weak?I have seen bad ignition switches cause weird problems before too.Many things power up through the ignition switch,just a thought.Have also seen bad PCM's cause strange problems..38 volts is a little on the low side for GM.Usually see those at,at least .50 and up,and rise steadily while pressing the throttle,up to just under 5.0 volts.Potentiometer with 5 volt supply.Vacuum leak can be checked with engine running at a steady idle speed,spray brake cleaner all around the intake manifold and listen for engine speed change.

SOURCE: buick lesabre no start

Hi you have replaced allmost everything ,(try fuel pump relay)

SOURCE: 1999 Yukon cold start problems.

1999 Yukon Start Issue - I have replaced the octopuse, battery, fuel filter, fuel pump, still having problems starting in cold weather, sometimes after a heavy rain.

Any suggestions?

Thanks

Jeffry Williamson

• 5 Answers
• Posted on Feb 16, 2009

SOURCE: 95 buick riviera supercharger

you can not put a regular 3800 intake in place of the 3800 super charged engine,the compression ratio is lower than the regular 3800 engine.......!

SOURCE: starts then dies

check your fuel pump relay