what should the volts going to tbi drop to when turning over engine 1987 suburban 350

Asked by May 08, 2017 at 07:34 AM about the 1987 Chevrolet Suburban V20 4WD

Question type: Maintenance & Repair

Chevrolet suburban 350 4x4 I have a 300 hp engine in it with stock allum. intake dist. tbi ect.. having starting problems after tune up.

2 Answers


I would check the fuel pressure, and check to see what the spark looks like. Fuel pressure should be 9 to 13 lbs, and the spark should look white, blueish in color. If it is a orange color then there is a weak spark. I think injector voltage should be around 5 to 7 volts.


Another thing to check would be the TBI base gasket, may be bad allowing a vacuum leak.

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