Mechanics

CHEVY

1998 Chevrolet Truck

Engine Performance problem
1998 Chevy Truck V8 Four Wheel Drive Automatic

Mulitple misfires- replaced plugs, wires, cap, rotor, injectors, timing

Under light load miss with mulitple cylinder misfires

check engine light does not come on, with scanner hooked up, shows 2 or 3 cylinders misfiring

fuel pressure check- ok, injector balance check-ok, EGR - ok

Any Ideas?
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Which cylinders are missing? The pressure regulator is on the passenger side (cyl 2 4 6 8 ) and if blown will leak raw fuel into the engine. What parts did you use in the tune up? Just because the balance test came out ok doesnt mean the injectors are spraying a good patter or the exact same amount. HAs a compression test and leak down test been done to verify the engine is solid and doesnt have a leaking intake valve or two

Tiny
Jack42
Apr 10, 2008.


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