1994 GMC Jimmy idleing high

Tiny
FIREFIGHTER47
  • MEMBER
  • 1994 GMC JIMMY
Engine Mechanical problem
1994 GMC Jimmy 6 cyl Four Wheel Drive Automatic

i have a gmc jimmy that I have just got running agian and it idles way to high how can I fix that
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Friday, February 6th, 2009 AT 9:36 PM

16 Replies

Tiny
BLUELIGHTNIN6
  • EXPERT
First thing to do is check for a vacuum leak. Pay particular attention to the EGR valve area, in intake manifold.

Let me know how the vacuum hoses and connections are and I will follow up.

Thanks for using 2CarPros. Com!
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Friday, February 6th, 2009 AT 9:53 PM
Tiny
FIREFIGHTER47
  • MEMBER
I have checked the vacume hoses and I thought the egr valve was under the manifold
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Friday, February 6th, 2009 AT 10:02 PM
Tiny
BLUELIGHTNIN6
  • EXPERT
EGR valve is located center, upper engine area, front of intake manifold, passenger side of water outlet, mounted in intake manifold.
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Friday, February 6th, 2009 AT 10:11 PM
Tiny
FIREFIGHTER47
  • MEMBER
How can I check if its working right
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Friday, February 6th, 2009 AT 10:41 PM
Tiny
BLUELIGHTNIN6
  • EXPERT
EGR valve would cause rough idle and stalling in most cases, not high idle. However, to check EGR valve function, have someone idle the parked vehicle with the brake on while you examine the plunger shaft to see if it is stuck open. Also, while engine warm, rev up engine and watch to see if valve is moving.
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Friday, February 6th, 2009 AT 10:46 PM
Tiny
FIREFIGHTER47
  • MEMBER
The jimmy is idleing way high not rough
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Saturday, February 7th, 2009 AT 9:51 AM
Tiny
BLUELIGHTNIN6
  • EXPERT
High idle can be caused by several things. A list of possible causes and corrections are below.

Ensure throttle linkage and/or throttle position sensor do not stick or bind.
Check park/neutral switch circuit. Ensure park/neutral switch is properly adjusted.
Check exhaust sytem for restrictions, such as a damaged or collapsed pipe, muffler or catalytic converter.
Ensure initial ignition timing is properly set.
Disconnect MAP sensor. If condition is correct, replace sensor.
Check engine idle speed (both base and PCM idle).
Check Idle Air Control (IAC) system. Check for foreign material in IAC bore.
Check power steering pressure switch circuit.
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Saturday, February 7th, 2009 AT 7:01 PM
Tiny
FIREFIGHTER47
  • MEMBER
I fixed my idle problem and now when I put it in gear it doesnt want to go and you push the gas and it back fires and cuts out
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Saturday, February 7th, 2009 AT 7:26 PM
Tiny
BLUELIGHTNIN6
  • EXPERT
Information about backfiring can be found at the link below. .

http://www.2carpros.com/first_things/why_does_an_engine_backfire.htm

After checking out these steps let me know if you still have the problem

Thanks for using 2CarPros.com!
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Saturday, February 7th, 2009 AT 7:31 PM
Tiny
FIREFIGHTER47
  • MEMBER
Could the fuel filter being cloged cause the back fireing and I put 8 mm wires on it insted of the 7mm wires that were on it could it be the problem
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Saturday, February 7th, 2009 AT 8:15 PM
Tiny
BLUELIGHTNIN6
  • EXPERT
Yes, clogged fuel filter will cause backfiring. Wires should be OEM parts and recommended size. If they are smaller than recommended size then yes, they could cause backfiring. Plugs will not receive enough to ignite all of the fuel which in turn will cause backfire. I would start with swapping out those wires before replacing the fuel filter.
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Saturday, February 7th, 2009 AT 8:29 PM
Tiny
FIREFIGHTER47
  • MEMBER
I was thinking bout switching out the filter changing the wires, plugs cap and roter all at the same time
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Saturday, February 7th, 2009 AT 8:38 PM
Tiny
BLUELIGHTNIN6
  • EXPERT
Oh okay, that would be even better. I was just trying to save money but if you can afford it then I would definitely replace it all. Even if fuel filter isn't the problem it will give you better performance and much better fuel mileage with a new filter.
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Saturday, February 7th, 2009 AT 8:40 PM
Tiny
FIREFIGHTER47
  • MEMBER
Ya its gona cost me about 50 dollars to replace all the wires and all that so I think ill just do that the only other problem I am haveing is that when I put it into gear that it doesnt want to move unless you get the rpms way up any sugestions
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Saturday, February 7th, 2009 AT 8:54 PM
Tiny
BLUELIGHTNIN6
  • EXPERT
First check your ATF (auto tranny fluid). If fluid is burnt or low then replace it and fill properly. If the fluid is good then the tranny will more than likely need overhauled. Having to rev the engine to get the transmission to move sounds like a worn out hydraulic front pump or something is really wrong with the gears themselves.
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Saturday, February 7th, 2009 AT 9:08 PM
Tiny
FIREFIGHTER47
  • MEMBER
I thought that it might be that it was low because that is the only thing I havent checked yet
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Saturday, February 7th, 2009 AT 9:11 PM

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