Question about 1998 GMC Jimmy

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After putting in a new air fliter in my 1998 jimmy it now gets poor gas mileage. Just got this vehicle so don't know to munch about jimmys. can someone help me?

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  • Eric Heifetz
    Eric Heifetz May 11, 2010

    little hard to swallow, that you just put in a NEW air filter ( hopefully correct size ). HOW did you determine PREVIOUS fuel mileage, as to what MPG your vehicle is now getting ?

  • yadayada
    yadayada May 11, 2010

    I really doubt this!

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  • Master
  • 490 Answers

18 mpg is the best I get in mine

Posted on Apr 21, 2009

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How to adjust carburetor in 1991 GMC Jimmy. Poor gas mileage and seem to be running rich.


its fuel injected try some injector cleaner lucas worked real good for me

Feb 06, 2015 | 1991 GMC S-15 Jimmy

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I have a 1998 gmc jimmy I fill the tank up and get close to 250 high way miles I don't know much about vehicles... The jimmy has a 6 cylinder and the vortec not sure what that means..... I think I...


you might want to look at your air filter coz it might be restricted.Also look at your plugs and for interests sake your air flow sensor.How does she idle when cold and hot?

Mar 23, 2012 | 1998 GMC Jimmy

1 Answer

New fuel pump, new cap, plugs and wires, clean air filter. My 98 Jimmy sounds like its missing, it boughs down. Mass air flow regulator? Fuel regulator? Also using a lot of gas lately.


You are right, all of the symptoms are pointing to a fuel pressure regulator. Also try inspecting your vacuum line going to your fuel pressure regulator.
Matt

Jun 24, 2011 | 1998 GMC Jimmy

1 Answer

O have a 96 Jimmy starts if u poor gas down it but will only run half throttle give it more and it cuts out change fuel filter what else could it be please help me


Check your fuel pump. Take the gas cap off, have someone turn the key to "run", and listen. You should hear the fuel pump humming for a few seconds, and then stop. If you don't hear a humming, you will likely need to change the fuel pump.
New ones are a ridiculous price for that truck. Try an auto wrecker. Let me know how you make out.

Jun 02, 2011 | 1996 GMC Jimmy

1 Answer

K1998 gmc jimmy 4 wheel drive truck cranks but wontstart.is getting fire,when it did run it smelled like gas strong


GMC Jimmy's have a record of corroded fuel lines at the fuel pump in the fuel tank. Cycle your key from "Off" to "Run" a couple times then look under the vehicle in the fuel tank area to see if there is gas dripping.

Dec 05, 2010 | 1998 GMC Jimmy

3 Answers

How many more miles do you have when the fuel light comes on?


Depends on a lot of factors:

1. Gas mileage of your vehicle. If you get excellent gas mileage, 50 MPG +, you can go quite a way. But with a 98 GMC Jimmy, you're probably getting 19 MPG at the best.

2. How you drive your vehicle. The gas mileage means nothing if you are street racing and redlining your vehicle through every gear with the low fuel light on. You definitely won't make it very far like that!

3. The make and model of vehicle. There is no set national standard for when the low fuel light illuminates on a vehicle, so they vary greatly anywhere from half a gallon remaining to 2 gallons remaining. In newer vehicles, the ECU actually takes into account how you drive the vehicle and what speeds you typically go as to when to turn on the low fuel light.

For your specific application, I would say it comes on when you have roughly 1 to 2 gallons left which means that as long as you are driving in a fuel conserving manner you can probably make it about 30 miles or so before you'll be running on fumes. But that should be plenty of time to find a gas station right?!

Hope this helps!

Aug 06, 2009 | 1998 GMC Jimmy

1 Answer

Daughters jimmy turns over but won't start


listen very close,when the key is turned to run you should be able to hear the fuel pump run for 3 seconds or so ,also every time you "bump" the starter the pump should run for 3 seconds again..
Fuel gauge is wired with the pump power. May be easier if someone listens at the fuel inlet with the gas cap off.(takes 2 people)

Jan 01, 2009 | 1998 GMC Jimmy

1 Answer

Wont start


CHECK THE FUEL PRESSURE, THE ELECTRIC FUEL PUMP MAY HAVE FAILED.

Dec 14, 2008 | 1998 GMC Jimmy

1 Answer

1998 GMC Jimmy


sounds like the computer has a glitch. you might need to go to the dealer to have the computer trained(reprogrammed) or to see if you need a new one.

Aug 13, 2008 | 1998 GMC Jimmy

1 Answer

My GMC Jimmy wont start


do you have any spark? this could be associated with timing. but, it could also be the computer(s).

just food for thought if you did: on some vehicles, you cannot just add a stereo amps and such electronic items that demand a high burst of energy, because it will mess with the computer/wiring (grounds and draws).

Aug 01, 2008 | 1998 GMC Jimmy

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