engine only running on #1 AND #3 cylinder ,new timingchain,crank sensor,head gasket,plugs,coils ,cover ,plug boots,different computer box,180 lbs compression,injectors work ok.fuel press ok

Asked by Jun 15, 2017 at 08:34 PM about the 1994 Pontiac Grand Am 4 Dr SE Sedan

Question type: Maintenance & Repair

3 different GM dealers said no security in key,12.3 volts to each fuel injector for 2-3 seconds when key is turned on ,no spray at injector,wires from injector to computer good mo breaks..module above coils checked ok at advance auto.

2 Answers

28,635

SO IT HAS A MISS??? WHAT ENGINE....4 CYLINDER??? FUEL PRESSURE OK? 12 VOLTS TO NON FIRING INJECTORS? 12 VOLTS TO ALL COILS??? WHAT ARE THE CODES NOW???? HOW MANY MILES ONIT SINCH BATTERY WAS RECONECTED???

955

Did you have the cylinder head checked when you had it off. The quad four and its single cam baby sister both had nasty cylinder and block cracking problems after even a mild overheat. A compression check should be able to confirm block cracking but a leakdown test using high pressure shop air will test the integrity of the head,valves and head gasket.

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