1994 GMC Jimmy Electrical

Tiny
CRYSTALANDKEVIN1
  • MEMBER
  • 1994 GMC JIMMY
  • 6 CYL
  • 4WD
  • AUTOMATIC
  • 100,000 MILES
1994 GMC Jimmy. I bought the vehicle & had $2500 of work done to the engine. I replaced the computer, EGC Valve, new distributor, wires, plugs, etc. After that, I had to replace the transmission. Then when I got the truck back the starter went. I replaced the started, then it would only start with a jump from another vehicle, so I replaced the battery. Then while I was driving all the lights came on and the truck stopped. So I replaced the alternator. It was starting ok for a couple days. Then it would only start with a jump. Now it will not start at all. I dont know what else to do! Please any advice you can give will be extremely helpful. Thank you.
Sunday, March 23rd, 2008 AT 9:02 PM

3 Replies

Tiny
RASMATAZ
  • MECHANIC
  • 75,992 POSTS
For a start get the ignition switch tested could be failing

Now it will not start at all.

Get a carb cleaner and spray into the carb or the throttle body on an EFI. Did it start and die? If not disconnect a sparkplug wire or 2 and ground it to the engine -have helper crank engine over-do you have a snapping blue spark? If so-you have a fuel problem, check the fuel pressure to rule out the fuel pump and listen to the injector/s are they pulsing.

Fuel pump and Injector/s checks out-start checking the ignition system-power to coil, coil/s itself, distributor pick-up, control module, Cam and Crankshaft sensors.

If both fuel and spark is present-check the valve and ignition timing, this will lead you to problems with compression and valves opening and closing at the wrong time
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Sunday, March 23rd, 2008 AT 9:10 PM
Tiny
CRYSTALANDKEVIN1
  • MEMBER
  • 6 POSTS
I checked the fuel pump, it is fine. I am getting fuel pressure to the engine. I checked the fuel pump, it also works fine. But when I finally get the truck started, if you let the engine idle and press down on the gas there is a dead spot at first, then it goes. It is almost like you have to gradually push on the gas. I hate to both you with this, but how do you test the ignition switch, control module, and cam & crankshaft sensors.
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Sunday, March 23rd, 2008 AT 9:23 PM
Tiny
RASMATAZ
  • MECHANIC
  • 75,992 POSTS
But when I finally get the truck started, if you let the engine idle and press down on the gas there is a dead spot at first, then it goes.

Investigate the throttle position sensor and the MAP sensor-test it by the book.
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Monday, March 24th, 2008 AT 12:33 AM

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