chevy 2001 5.3 won't fire on 5 & 6 cylinders

Asked by Jun 08, 2017 at 02:37 PM about the 2001 Chevrolet Silverado 1500 LS Extended Cab SB 4WD

Question type: Maintenance & Repair

I changed coils on 5 &6 cylinders along with all plug wires but the cylinders 5 &6 keep filling up with fuel. Truck some what starts but run extremely rough . could I be crank and cam sensors .what do you think .thanks

1 Answer

76,365

Sounds like there are some leaking fuel injectors. To verify do a fuel bleed down test. Hook a fuel pressure gauge up to the Schrader Valve, build up fuel pressure by turning the key to the on position. Turn the key off once fuel pressure has built up. Take note of the fuel pressure. Fuel pressure should not bleed down more than 5 lbs. in three minutes. Depending on what size this engine is, determines on what parts would need to be replaced.

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