Question about 2000 GMC Jimmy

1 Answer

Changed thermostat, now jimmy won't start???

Hey guys it's been a while, Jimmy's been running great until now...... My thermostat was finished so I changed it, went off without a hitch, so I thought! Now she starts for about a second then dies??? I don' understand? Does anyone have any idea what could could be the issue? Any help will be greatly appreciated. Thanks.

Posted by on


1 Answer

  • Level 1:

    An expert who has achieved level 1.


    An expert that got 5 achievements.


    A rookie expert who has answered 20 questions on their first day.


    An expert who has answered 20 questions.

  • Contributor
  • 40 Answers

If you unhooked your battery you should check your cables and make sure they're tight, it could just be a loose ground cable.
other possible problems are:
1. something wasn't plugged back in
2. coolant levels are low
3. or the worst possible scenario is that the timing belt broke which would cause the engine to over heat and depending on the year of the engine you've destroyed the top of the engine and it will all have to be replaced.

Posted on Dec 31, 2013

  • 4 more comments 
  • Dave
    Dave Dec 31, 2013

    Well I checked my coolant levels, they are good, didn't unplug anything so I don't think that's it. And nothing broke the truck was running great just didn't have any heat so I don't think the top engine is destroyed.

  • Dave
    Dave Dec 31, 2013

    Any other ideas???.?.

  • stitches0718
    stitches0718 Dec 31, 2013

    what year is the vehicle?

  • Dave
    Dave Dec 31, 2013

    What could I have accidentally unplugged that would cause this???

  • Dave
    Dave Dec 31, 2013

    2000 and I checked the terminals their on there good. Side terminals so they are either on or not lol. Still don't understand what could be the problem?

  • stitches0718
    stitches0718 Dec 31, 2013

    it could be the coil spark sensor. other than that i'd suggest just unplugging the battery for a few seconds and hooking it back up.



4 Suggested Answers

  • 2 Answers

SOURCE: I have freestanding Series 8 dishwasher. Lately during the filling cycle water hammer is occurring. How can this be resolved

A 6ya expert can help you resolve that issue over the phone in a minute or two.
Best thing about this new service is that you are never placed on hold and get to talk to real repairmen in the US.
The service is completely free and covers almost anything you can think of (from cars to computers, handyman, and even drones).
click here to download the app (for users in the US for now) and get all the help you need.
Good luck!

Posted on Jan 02, 2017

  • 4669 Answers

SOURCE: My 2000 gmc jimmy will not start. It will turn

Have you hooked up a fuel pressure gauge to the test port on the rear of the intake, drivers side. You can get a fuel pressure tester for about 40 dollars at a part store. It is a real good tool to have in your toolbox. If your Jimmy can't build 55 psi, it won't start.

Posted on Mar 07, 2009

  • 195 Answers

SOURCE: 97 gmc jimmy will not start.

Did you also check the ignition system?? Best trick to find out if you have fire on the plugs is to pull one out, put the wire on it like if it was still sitting in the engine, hold it with the threaded part touching the engine so it will be grounded and able to make a spark, and have a friend turn the key inside and try to start it. If it does fire up, ignition should be OK and the problem should reside in the electronics side of the engine. Which means check the Idle Air Control, Throttle Position Sensor, Mass Air Flow/Pressure sensor, and last but not least, the onboard computer.

Posted on Jul 07, 2009

  • 1055 Answers

SOURCE: 2001 GMC Jimmy 4x4 turns over but doesn't start - Fuel pump works

check the fuesable link!!

Posted on Sep 05, 2009

Add Your Answer

Uploading: 0%


Complete. Click "Add" to insert your video. Add



Related Questions:

1 Answer

I have a 1999 GMC jimmy 4 door 4x4 v6 4.3 ltr automatic with a starting problem, it starts with starting fluid and runs great afterwards can drive all over God's creation afterwards, but day a

Sounds like you are loosing fuel pressure overnight. Since it takes 70+ psi to start and run, if you have zero pressure in the morning, it would take a long time of cranking to get the pressure back up.
If it is low or no pressure, the problem could be a faulty check valve in the fuel pump.

Dec 01, 2014 | 1999 GMC Jimmy

1 Answer

Pressure cooling system both of my sons & myself have 2005 jimmy 's , just changed two thermostats got great heat for about a week now no heat from heater core's on both jimmy's engine heats up but...

To fix a vapor lock just let your car cool down, take off your radiator cap to the first notch, not all the way, and start the car and let it idle until some coolant starts to come out. Then turn off the car and put cap back on, being careful sine the coolant will be hot. On some models there is a bleeder screw, usually on or near the thermostat housing. It is a brass screw, so be very gentle with it as it will easily break if over tightened. Unscrww the bleeder until solid liquid with no air comes out and then tighten gently.

Mar 04, 2014 | GMC Cars & Trucks

1 Answer

97 gmc jimmy cranks but won't start, have replaced everything possible but still won't start, most of the time the brake lights won't work, or the gauges goes crazy. I have changed relays,...

There are two basic reasons for not starting - no spark or no fuel, both of which are controlled by the ECM. You need to check error codes and these items - for the spark, test it at the cylinder 1 sparkplug; for the fuel check the pressure (if too high or low, problem!).

Aug 28, 2017 | 1997 GMC Jimmy

1 Answer

1993 GMC Jimmy won't throttle up..changed fuel pump...sounds like fuel is running back into tank

Check fuel pressure regulator.Start engine hook fuel gauge to fuel line check pressure ready then pull the vacuum hose of the fuel regulator if pressure rises 5-10 psi then its good.

May 13, 2011 | 1993 GMC Jimmy

2 Answers

1999 GMC Jimmy Running Hot w/ Engine coolant reservoir empty

I guess the burning question is , where is the coolant going.
Is this a 4.3 engine? How many miles does the vehicle have?
Has the intake gasket been changed?
I'm guessing a can of "Bars Leak" may cure your problem.
Let me know.

Apr 03, 2009 | 1999 GMC Jimmy

1 Answer

Won't start

There is a detailed write-up here: That guy is great, this was the only way I was able to save my Park Avenue.

Jan 10, 2009 | 1999 GMC Jimmy

Not finding what you are looking for?
2000 GMC Jimmy Logo

41 people viewed this question

Ask a Question

Usually answered in minutes!

Top GMC Experts


Level 3 Expert

79077 Answers

Colin Stickland
Colin Stickland

Level 3 Expert

22326 Answers

Ronny Bennett Sr.
Ronny Bennett Sr.

Level 3 Expert

6927 Answers

Are you a GMC Expert? Answer questions, earn points and help others

Answer questions

Manuals & User Guides