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About CAJUNSC/RAMBLER390
Expertise
1998 and NEWER questions ONLY!! I WILL REJECT QUESTIONS FROM 1998 BACK. Electrical diagnosis. Brake Diagnosis. Driveability, Service Engine Soon Lights. Some Engine mechanical. Tires and wheels. ABS. HVAC. Air Bag (SIR). Interior, seats, etc... 6.6L Duramax Diesel diagnosis. 6.5L diesel diagnosis. I WILL not answer Alignment questions OR carburetor questions. No heavy internal transmission
I need YEAR, MAKE and MODEL of vehicle, and ENGINE SIZE and TRANSMISSION type, IF applicable to the question.
I work at a Large, Busy GM Dealership
Last thing, my answers are JUST SUGGESTIONS and ADVICE and you should ALWAYS CHECK with your mechanic for proper diagnosis and repair.

Experience
18 Years GM Dealership experience as an "A" line tech. ASE MasterTechnician. 100% GM certified MTC Certified.

Education/Credentials
High School graduate. No College or higher learning.

You are here: Experts > Home/Garden > Auto Repair > GMC Repair > 1998 GMC Savanna 350 will not start

GMC Repair - 1998 GMC Savanna 350 will not start

Expert: CAJUNSC/RAMBLER390 - 11/1/2009

Question
Hi, I have a 350 Savanna that will not start all the time, and when it does the engine will stall after a little while. I just replace the fuel pump as it was not working correctly but that did not solve the problem. I then replaced the fuel filter and relay, but again, it made no difference. I checked once and there was spark, and the new fuel pump does run. Is the problem an intermittent coil? Or could the problem be a bad pressure regulator?
thanks

Answer
Hi
My best answer would be to check the fuel pressure when it will not start. Guessing will only cost money. Check fuel pressure, spark from coil and also from dist to plugs. If presssure bleeds down quickly (from 66psi to say 30) in less than 1 minute, you MAY have a regulator issue.'
The Vortec engine these years HAVE to have 60=66psi no more no less.
Good Luck

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