Bucking 96 K 2500 Thinking Fuel

[BAKERBAKER]

I BOUGHT A 96 X CAB K 2500 ON EBAY 5.7 FOR $ 2800, PICKED IT UP ON TRAILER, WHEN I GOT IT HOME IT IDLED GOOD BUT UNDER LOAD OR ACCELERATION JUST BUCKED LIKE HELL. I AM AN EXCAVATOR WITH ALL DIESELS SO FIRST THOUGHT WAS FUEL CHANGED FILTER. DIDNT CHANGE , MAYBE WATER IN FUEL USED ADDITIVE, STILL SAME NEW PLUGS NOPE, NEW CAP AND ROTER NO CHANGE. THE TRUCK IS BASICALLY UNDRIVEABLE BUT YOU GOTTA TAKE HER OUT TO TRY IT. THEN IT DIED ON ME AND I COULDNT GET IT STARTED I NOTICED THE FUEL PUMP WOULDNT WHINE WITH THE FLIP OF THE KEY, OFF ON NO FUEL PUMP, AFTER A COUPLE MORE TURNS THE PUMP STARTED AND THE TRUCK FIRED CAME HOME GOT A NEW PUMP AND WIRING HARNESS WITH SCREEN. STILL BUCKED I DONT MEAN A MILD MISS I MEAN IT SHUTS OFF THEN ON OFF THEN ON. THEN ONCE AGAIN IT DIED. TUNED ON KEY NO PUMP SOUND, OFF AND ON SEVERAL TIMES THEN THE PUMP COMES ON MAYBE 15 MIN. THEN I BUCK ON BACK TO THE HOUSE. PULLED COVER OFF FUEL RELAY IT KICKS IN AND OUT (EVEN WHEN PUMP DOSNT COME ON) BOUGHT A NEW ONE JUST SO I COULD FEEL BETTER. TODAY I NOTICED NO SPARK IN THE #1 SPARK PLUG. GRABBED THE WIRE FOR A CLOSER LOOK GLOVES AND ALL LIT MY ASS UP BAD ( COIL REAL STRONG) BOUGHT NEW WIRES STILL THE SAME
QUESTION IS FUEL PUMP DOSNT ALWAYS COME ON RELAY IS GOOD, THE PRIMARY SUPPLY IS THROUGH THE COMPUTER IS THERE ANY WHERE ELSE TO LOOK. HAVENT TRIED SHORTED WIRE BUT MAYBE. HOPPING FOR SOME MAGIC BEANS OR JUICE FROM SOMEWHERE. NO CODES ON THE COMPUTER EXCEPT WHEN YOU SET EM OFF TESTING SENSORS. TESTED TPS, GOOD, MAP SENSOR,
GOOD, MAF GOOD, COULDNT DO ANYTHING WITH EGR EXCEPT TEST SUPPLY IT WAS GOOD AND I HAVENT MESSED WITH VACCUM TEST YET BETTER LUCK TOMORROW. JUST GETTING TIRED OF THINKING I BET THATS IT. THEN AS SOON AS YOU WALK OUT OF AUTO ZONE THINKING I HOPE THIS DOES THE TRICK TO AS YOUR INSTALLING THE PART THINKING i DONT KNOW ,TO THIS ISNT GOING TO WORK AT ALL AS YOU TURN THE KEY. TRUCK RUNS GOOD AT IDLE, OR PUMPIN THE THROTTLE. BUT PUT IN GEAR AND IT CUTS OUT

[2000CAYukon]

For 96, the fuel pressure should be around 60 PSI. Might want to get a gauge and see where it is.

If it drops below 45 under a load, it could be a bad fuel pressure regulator (which by the way is a pain in the $%@ to replace since you need to take the upper half on the intake manifold off).

//2000CAYukon

[BAKERBAKER]

Originally Posted by 2000CAYukon

For 96, the fuel pressure should be around 60 PSI. Might want to get a gauge and see where it is.

If it drops below 45 under a load, it could be a bad fuel pressure regulator (which by the way is a pain in the $%@ to replace since you need to take the upper half on the intake manifold off).

//2000CAYukon

BOUGHT FUEL TEST GAUGE, PRESSURE AT 60 WITH 53 AT IDLE, FINNALLY GOT LIGHT WAS CODE 1351 IGNITION CONTROL HIGH VOLTAGE REPLACED COIL AND FIXED PROBLEM. BUT NOT ALL 1351 CODES ARE PROBABLE COIL BUT EVERYTHING ELSE WAS NEW SO WHAT THE HECK LOT OF PARTS AND MONEY BUT I GOT A SCANNER AND A NEAT FUEL PRESSURE TEST KIT.