running problem under hard acceleration

Asked by Aug 11, 2013 at 06:55 PM about the 1987 Buick Grand National

Question type: Maintenance & Repair

car backfiring under hard acceleration after turbo spools up, oxygen sensor going to o and running lean, installed new high pressure fuel pump with no avail, idles better but still runs bad under hard acceleration

4 Answers

35

it might be ur fuel filter, only problem is, its expensive cause most filters are inside the fuel tank.

135

ALL BULLSHIT U GUYS. FIRST OF ALL, U NEVER PUT A HIGH PRESSURE FUEL PUMP IN A STOCK VEHICLE......PERIOD. BIG MISTAKE !!! YOUR INJECTORS CAN'T HANDLE IT. WHAT WERE U THINKING ? CAN'T PUT 100 LBS. IN A 10LB. BAG, GET IT ??? GOOD, NOW LETS MOVE ON, REVERSE WHAT U DID. OR BUY UPGRADE GREEN FUEL INJECTORS, WITH NEW O-RINGS, NEW FUEL AND AIR FILTERS, NEW OXYGEN SENSOR. E3 SPARK PLUGS. MAKE SURE PLUG WIRES ARE GOOD, OR BUY NEW GREY REPLACEMENTS. YOUR MAS, MASS AIR FLOW SENSOR MIGHT NEED REFURBISHED, WWW.CARDONE.COM , THIS SENSOR IS CRITICAL TO GREAT PERFORMANCE. KEEP YOUR MOTOR OIL CLEAN W/NEW FILTER. DO U UNDERSTAND ??? I'VE OWN A 1987 GN ALL MY LIFE, I KNOW WHAT IT TAKES, I TREAT IT LIKE MY WIFE, WITH KID GLOVES, LIKE A DOCTOR AND HIS PATIENT, U NEED TO KNOW ALL YOUR SENSORS R GOOD, THE GAS WE BUY TODAY IS GARBAGE, ETHANOL IS KILLING OUR ENGINES, GARBAGE IN GARBAGE OUT. KAPESH ??? BY THE WAY, I'M GERMAN . BUT LOVE ITALIAN FOOD. GOOD LUCK MY FRIEND. KEN

1 out of 1 people think this is helpful.
135

PS, YOUR CRANK SENSOR MAY NEED REPLACED, ALSO, HARD STARTING AND BACKFIRE THRU THROTTLEBODY R SYMTOMS.

1 out of 1 people think this is helpful.
135

CHECK OUT MY RATING ON FIXYA.COM, WHAT THEY GIVE ME HERE, IS CONDISENDING !!!

2 out of 2 people think this is helpful.

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