1999 gmc 1500 4.3litre will not start???

deuce65 · 04-12-2007, 02:56 PM

Truck was running fine last week , then stalled intermittently. I have replaced the fuel pump and filter-dist. pick up-crank sensor-cap and rotor button (has newer wires and plugs) and coil. The vehicle will not start at all now? the module was checked and seemed fine. Only other things to replace are the ecm and ignition switch?? I am mechanically inclined but this has me stumped? I have a manual but it doesnt seem to help...has anyone had a similiar problem with their GMC?? Any input would be appreciated. I'm doing what I can so I dont have to take it to the dealer if possible. Thanks

maxwedge · 04-12-2007, 04:53 PM

You really should have posted this in the open Sierra forum. Lots of info is missing here, strong spark? Fuel presssure of 65 at the rail when cranking, will it start with carb cleaner sprayed into the intake?

deuce65 · 04-12-2007, 05:27 PM

I have the correct fuel pressure, It has no spark. I check and its getting voltage to the coil and ignition module, also has pulse from crank..but still no spark?? Maybe ECM?? Sorry but i'm new to this forum stuff so sorry for the lack of info or placement of thread. I'm just frustrated with this truck. thanks

maxwedge · 04-12-2007, 08:36 PM

Does the dist turn, look with the cap off, some bad dist gears out there. I have also replaced the cpoil wire for this on a couple of 99/2000 trucks.

deuce65 · 04-13-2007, 06:32 AM

Distributor does turn and wires are relatively new. I'll check the coil wire though to be sure. Thanks

Rutledge_Customs · 11-04-2007, 09:41 PM

I also have a 1999 gmc 1/2 ton with 4.3. It was my INJ A fuse that was blown. not sure of cause yet. pulled tape back on most of the wire that are easy to get at. no problems I could see yet. I put a 20 amp in and the truck started right up. not sure if this will help but would also like to know any other possible causes

old_master · 11-15-2007, 06:10 PM

Quote:

Originally Posted by Rutledge_Customs

I also have a 1999 gmc 1/2 ton with 4.3. It was my INJ A fuse that was blown. not sure of cause yet. pulled tape back on most of the wire that are easy to get at. no problems I could see yet. I put a 20 amp in and the truck started right up. not sure if this will help but would also like to know any other possible causes

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