I have a 2001 gmc sonoma extended cab 4 cylinder. this past 2 weeks the truck will not start. when i turn the key forward once all the lights on the cluster light up as normal but i don't hear the fuel pump turn on either. when i turn the key all the way the truck doesn't crank or anything doesn't make any sounds at all. i checked all the fuses and they were all good someone told me it could be a bad ignition switch so i changed it. the truck started fine for 2 days and ran fine. i go to start it today and nothing no crank no noise and no fuel pump turning on. when i turn the key forward once every single light on the dash comes on and stays on. now i am being told it can be a bad ground somewhere in the truck. please help i am going crazy trying to figure this problem out.
SOURCE: 1997 GMC K1500 4x4 5.7 ex.cab SFI injection system
Did you check the fuel filter?
or possably the catalitic converter is cloged, check the exhaust pressure.
SOURCE: 1997 GMC K1500 4x4 5.7 ex.cab SFI injection system
Hey there boatright33,
A few things things immediately come to mind.
There may be a problem with the engine controller. You could check the
ODBII onboard diagnostics. Auto part stores will usually do this for
you at no cost.
When you pulled the ones that were/went bad, how did the filters look? Could there be particulate matter still in the tank causing them to fail.
I always put this one off until last. Check the injectors. Are they gummed up?
Let me know what you find out
Mike
SOURCE: shuts off while driving. no fuel pressure. pcm fuse blows/ fuel pump relay inserted.
Sounds like the fuel pump is shorted.
SOURCE: 1999 GMC Jimmy won't start.
firstly where is fuel pump relay as i have never seen a GMC jimmy sorry about that but have you ever seen a foden ?? well the first thing is to check the fuse,if fuse is ok which can be checked by looking at it as its transparent or a piece of wire with a light bulb .across the battery.to find the relay is easy if you dont know where it is,When this piece of americana decides to work just turn ignition on and listen for the click of relay ,then when it doesnt start listen for click again or rather an absence of a click,sounds more like a dodgy pump in the tank or the connections going to it.when it wont start try thumping the fuel tank with the ignition on and if it is a sticky pump you might hear it start then at least you will know where the fault is.Another fault that i have come across with relays is that where the relay is passing a heavy load then its possibe for the contacts to burn inside the relay.When this happens then if it is possible to seperate the relay cover and clean the contacts with a points file (remember them ) or a piece of fine emery paper if the cover breaks taking it apart then use a bit of black insulating tape to repair the cover.Thats assuming the pump is in the tank and not bolted to the chassis near the fuel tank but that design with external pump i havent seen on a europeon car for nearly 20yrs .
SOURCE: 2000 GMC Jimmy will not start
The oil presure switch does have some bearing on the problem but my suggestion is to change the coil. I had a the same problem with an astro van. I changed everything that you have described and it fixed the problem just for a little while and then all of a sudden did it again. I changed the coild and the cold start swithch and never had the problem again.
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