Wjy does my 1998 GMC Jimmy use so much gas?

Asked by Nov 04, 2013 at 04:33 PM about the 1998 GMC Jimmy 4 Dr SLT 4WD SUV

Question type: Maintenance & Repair

Engine runs VERY strong. Check engine lite is on. The dealer who
sold it to me sad d he checked the code and it was misfire cylinder 3
& 5. There is no rumbling. Runs smothe. Drnks gas at a rare of
about 10 per gallon. WHAT DI I DOOOOOOOOOOOOO!!!!

2 Answers

257,775

So did the dealer replace the coils and or spark plugs in cylinder # 3 and #5 yet? That is why you are getting terrible MPG.

19,535

as stated check the plugs, cap and rotor. i would also recommend doing a fuel pressure and leakdown test. Failing fuel injectors are common.

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