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99 GMC Jimmy fuel economy

6 messages,  Last post on Mar 11, 2009 at 6:32 PM

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#1 of 6 99' GMC Jimmy by drewcarr1 Dec 22, 2008 (12:58 pm)
I have a 99' GMC JIMMY with 150,000 mile. The milage has been crappy lately.I could drive about 5 miles and i can see a difference in the fuel guage. I had the dealership do the fuel injector service,I also had another mechanic change the o2 sensors since he said that would help the mileage.Is there any other part i can change to help my mileage. I know suv's burn more gas but i dont think i should be seeing a significant drop in my guage when i have only driven about 5 miles or so. Replies to this message: tidester (Dec 22, 2008 3:03 pm)
#2 of 6 Re: 99' GMC Jimmy [drewcarr1] by tidester HOST Dec 22, 2008 (3:03 pm)
Replying to: drewcarr1 (Dec 22, 2008 12:58 pm) You may want to take a look at 2000 Jimmy/Envoy Fuel Gauge Problem or Blazer Jimmy Real World MPG.   tidester, host SUVs and Smart Shopper
#3 of 6 01 GMC Jimmy by hughes70 Jan 03, 2009 (8:00 am)
I have a 01 GMC Jimmy recently changed the fuel pump and now it is misfiring. The check engine light is on, went and had code read and came up misfire on cylinder #5 . I have changed the plugs,wires, and distributor cap. Any other suggestions? code is po305
#4 of 6 01 gmc jimmy by theyard1 Jan 22, 2009 (9:45 am)
I have the same code misfire on cylinder #5 took to shop thay told me it was my fuel presure reg leaking fuel into cylinder #5 Replies to this message: hughes70 (Jan 22, 2009 10:51 am)
#5 of 6 Re: 01 gmc jimmy [theyard1] by hughes70 Jan 22, 2009 (10:51 am)
Replying to: theyard1 (Jan 22, 2009 9:45 am) Mine didn't end up being fuel pressure reg leaking, it ended up being the intake manifold gasket. It is finally up and running no check engine lights or anything!! Thanks for your post though.
#6 of 6 99 GMC Jimmy 2 door 4.3L by vince_27 Mar 11, 2009 (6:32 pm)
My Jimmy has 153,000 miles on it. Lately it wont start. It will rollover but not fire up. After it rolls over, I turn off the key and it sounds like compression coming out of the air filter for a few seconds, and there is some smoke coming from the air filter? I kill the battery trying to start it? I have to jump it to get it to start. When it does start up there’s lots of black some coming from the tail pipe they last for about 5 seconds? Any ideas what could be going on?

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