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GMC Repair/1998 GMC Savanna 350 will not start

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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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CAJUNSC/RAMBLER390

Expertise

1998 and NEWER questions ONLY!! I WILL REJECT QUESTIONS FROM 1998 BACK. Electrical diagnosis. Brake Diagnosis. Driveability, Service Engine Soon Lights. Engine mechanical. Automatic or Standard Transmissions. Drive Line (drive shafts, axles) Rear and front differentials and 4wd Transfer Cases. 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.
I need YEAR, MAKE and MODEL of vehicle, and ENGINE SIZE and TRANSMISSION type, IF applicable to the question. The more information, the better.
EFFECTIVE Jan. 2012, I will not answer questions about PARTS or AFTER MARKET installed items.(After Market radios, entertainment systems, alarms, etc...)
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 Master Technician. A-9 Light duty Diesel certified as of 2011. 100% GM certified MTC Certified. GM World Class Technician.

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

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