HAVING PROBLEM'S WITH A 4.3 ENGINE- IN A 1999 GMC SAFARI
I HAD A PROBLEM WITH A NO START HAD A REPAIR SHOP LOOK AT IT. THEY SAID THE FUEL PUMP WAS BAD SO THEY SAID THEY REPLACED IT AND THE EXTERNAL FILTER. AFTER THAT I HAD NOTING BUT TROUBLE'S WITH THE ENGINE. I TOOK IT TO ANOTHER REPAIR SHOP AND THEY PUT IN 3 NEW OXYGEN SENOR IN AND THAT SEEM TO HELP I ALSO HAD A NEW CATALYTIC CONVERTER PUT IN. NOW I HAVE A INTERMITTENT PROBLEM SOME TIMES IT RUNS REAL BAD LIKE YOU CAN GET IT TO GO OVER 30TO40 MPH. AND THE LIGHT COMES ON AND FOR THE OXYGEN SENORS. SO THIS OTHER REPAIR SHOP PUT 2 MORE SENOR IN NOW IT RUNS GOOD FOR AWHILE AND THEN RUNS BAD AGAIN AND THE CAN'T FIGURE IT OUT. CAN YOU HELP ME PLEASE I HAVE SPENT ABOUT 1600. DOLLAR ON IT SO FAR. THANKS RON MY EMAIL ADDRESS IS( email@example.com)
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It could be a bad fuse or a bad fuel pump not providing fuel for the car. It could also be an issue with the timing belt.------------------------------------------------------------------------------------- Digiprog 3
If your not getting the MIL- engine light coming on and you can smell gas and you had the fuel pump replaced. I would sespect the electronic ignition module of being intermintent. It wouldn,t necessarily show as an engine code and would make it so the vehicle would run find one munite and not run the next The other thing you could check is the fuel filter however i can,t see a mechineic not changeing this with the fuel pump
It's the crankshaft position sensor, most likely bad. I just had the same problem, replaced the fuel pump, filter, plugs and wires, as soon as I replaced that fired right up. The part is around $50 and it's located under the vehicle, passenger side.
DO'ES THE VAN TURN OVER ? DO'ES THE VAN HAVE THE FUEL PUMP RUN LONG ENOUGH TO BUILD FUEL PRESSURE?IF YOUR FUEL PUMP AND STARTER ARE WORKING THEN CHECK FOR FIRE TO THE PLUGS. YOU MAY NEED TO GET THE CODES READ TO FIND THE PROBLEM IF YOU HAVE FUEL AND FIRE.ONCE YOU GET THE STORED CODES,REPLACE THE SENDER THAT CAUSED THE CODE OR REPAIR THE WIREING TO IT.
Check fuel presure.I believe its 61 to 65 psi, with little or no drop off in ten minutes.V-6 access port for fuel presure is at left rear of engine,(remove dog house to access). Fuel pump is in fuel tank.Use AC Delco only, there is a updated wire harness conector for these.
Yah, I'm thinking weak relay, or faulty pressure regulator for starters. Can't blame the pump, if it isn't getting power to run it. Also make sure ground is good. Filter has been changed.?That's why I would have confirmed power to pump before I pulled the first one out. Check on ( Autozone.com ) for fuel system components, electrical, relays etc that are associated with your vehicles fuel system.