1998 GMC Z -71 acts like it jumped timing

Asked by Manta_1611 Feb 07, 2017 at 10:26 PM about the 1998 GMC Sierra 1500 K1500 SL 4WD Extended Cab SB

Question type: Maintenance & Repair

My truck acts like it jumped timing but pull #1 TDC
and rotor button points at #1 on distributor cap, so
it's in time. It lags to start so bad burnt one starter
up. If pedal is held to floor it will crank but won't ifle

1 Answer
220,825

Rowefast answered 7 years ago

May have a fuel pressure issue, or ignition issue. Check to see if you have spark. If so, then there may be a problem with the spider injection, or the fuel pump. Fuel pressure should be checked after replacing the fuel filter, it should be 56 to 63 lbs. at the Schrader Valve.

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