I have a 1999 Chevrolet blaze 4.3 vortex engine, ran great, suddenly won't start, is getting spark & fuel, spark is strong, not sure of exact fuel pressure but it seems sufficient...


Asked by Dec 15, 2015 at 02:50 PM about the 1999 Chevrolet Blazer 4 Door LS 4WD

Question type: Maintenance & Repair

Was told it was knock sensor, also told it
was mass air flow sensor..

1 Answer


You need to know the fuel pressure. If the pressure is low the poppet valves of the injectors will not open. With key on engine off you need to see 60-66psi of fuel pressure. Check your filter and try again before you fail the fuel pump.

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