radical fuel mpg loss 1994 chevy suburban

Asked by bvdriver12 Mar 27, 2013 at 07:27 PM about the 1994 Chevrolet Suburban K2500 4WD

Question type: Maintenance & Repair

last summer vehicle was in high heat 1oo plus degrees outside temps. battery went dead tried to jump start burned up a set of jumper cables in jump start process the cables were connected properly from ea veh battery pos to pos  neg to neg . after replacing battery the suburban started ok runs ok but have a radical mpg loss . any thoughts ?

5 Answers
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tenspeed answered 11 years ago

I would start by checking the EGR and PVC valves. Something changed to cause that kind of drop. Maybe a O2 sensor but that have lit the CEL.

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migration_judge_roy answered 11 years ago

no check engine light? there should be with a problem of this nature, even the plugged EGR should toss out a warning- efficiency should be monitored....somewhere?....the built in diagnostics~

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bvdriver12 answered 11 years ago

no c e l. need to check intake and other vac lines and vac operated devices for leakage and function and will check intake manifold gaskets and egr valve also will check idle air control valve as well and clean carbon deposits. thanks for your help.

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bvdriver12 answered 11 years ago

egr valve can have a carbon problem and not trip a code or the I a c v can can have a carbon problem and not trip a code.

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bvdriver12 answered 11 years ago

any other suggestions out there ? other jacking up the radiator cap and bring in a new veh L O L.

Mark helpful

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