Question about 1998 GMC Jimmy
It is having a hard time starting in the morning, but once it does start, it will start and run fine the rest of the day. But sometimes, like now, it does not start at all. I have had it in a repair shop a few times, the first time it had to be towed. It started for them. I took it home and the next morning it didn't want to start. I waited a few hours, then it did start but I took it back to the shop. They tested the fuel pump, said it has good pressure they said they hooked it up to some tester machine and everything looked okay. I took it home and it had trouble starting the next morning so I took it back and had them change the fuel filter. Drove it home...next morning (yesterday), would not start. Still won't today. It turns over, but refuses to go. One of the times I was able to get it going (a few days ago)...it blew out a small cloud of dark smoke that smelled like smelly exhaust fumes...which it has never done before, nor has it done it again. The repair shop does not seem interested in my problem...they continue to say, "it starts fine for us'. I also had a male friend of mine take it home for the weekend to see how it worked for him. It did not start the first morning for him...but later in the day it did and he drove it directly to the repair shop, (he knows them there...they kept it all night and it started for them the next morning). I've had this vehicle for three years and it runs fine...have had a few minor things fixed. But the security system has always been out of control it seems. Sirens go off while I'm going down the road...once in a rain storm, the doorlocks kept clicking up and down by themselves, for about 20 miles...many, many times it has refused to start while all the lights were blinking inside and out...this stranded me a few times until I found the problem in the book which said to hold the two buttons on the key holder down at the same time until they quit blinking...then it starts again. I've had to do this countless times. I decided to sell this car, but as soon as I listed it in the paper...it quit starting...would love to get it fixed and send it on it's way.
Sounds like your problem might be with the VATS anti theft system. Does your truck have the chip in the key? If so you might just need the ignition lock cylinder changed out. There are 2 very small wires that run from the lock cylinder down the column and plug in under the dash. After time the wires insulation will get brittle and crack. The wires read the resistance of the diode chip that is in the key and send the signal to the VATS computer witch tells the ECM weather to send the signal to the fuel pump or not. On a cold moist morning the resistance signal can be interrupted or the resistance lever raised enough for the computer to get an improper signal. Your vehicle is thinking that an improper key is being used to try and start the vehicle. A replacement lock cylinder can be purchased for around $80 at your local part store and you will need to take your current key and the new cylinder to a lock smith to have the pins in the new cylinder changed to fit your current key. This way all of your current keys will still work the vehicle instead of having to pay $40 for each new key. Anyway, after you have the new cylinder working with you old key simply take it in to have it changed out, shouldn't take any competent mechanic with the right tools more than an hour to change out.
Posted on Apr 24, 2013
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Posted on Jan 02, 2017
SOURCE: Same thing here...
thanks for your help I will continue checking this since I have like 2 month with this problem, I will let you know what happends probabliy I will need to take my truck to a dealer,
Posted on Oct 21, 2008
Possibly faulty ignition module is the problem, stalls when engine is hot when you sit for a while it cools off and runs again until it heats up again, those are usually the symptoms of a bad ignition module and after a while it may give out all together and not run at all, usually if the module is at fault it shuts down the fuel pump so the engine don't load up with fuel, do to when engine continuously cranks over the injectors never stop squirting fuel and flood the engine do to lack of spark which is produced by the module, this could possibly be your problem.
Posted on Nov 01, 2008
does it have spark? you did verify fuel pump working properly? could it have a clogged converter? is the engine lite on?
Posted on Nov 16, 2008
probaly a fuel pump its common for vehicles to do that the best thing to do next is a fuel pressure check to verifiy its the pump
Posted on Apr 15, 2009
SOURCE: 1987 gmc jimmy wont start
yea you have no fuel and sound like a bad harness and the gm's are know for there fuel pump harness's! did you change it when you changed the pump? there is a lose connection somewhere in the fuel delivery system and it's pretty simply! i would check the fuel pump relay on the left hand side of the engine compartment and maybe even put power to the pump at the relay position "b" on the fuel pump relay harness and there should be a one pin connector to put power to also connected to the same position on the relay "b" the wire should be tan and white! good luck
Posted on Sep 18, 2009
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