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96 tahoe. rough idle & bad mileage
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Dave79
New User
May 31, 2007, 12:21 PM
Post #1 of 2
(2656 views)
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96 tahoe. rough idle & bad mileage
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just bought a 96 chevy tahoe with a 5.7. 4x4. I have done a tune up complete with plugs, wires, oil change, k&n, & fuel filter. Didnt go cheap on any of it. But I am still getting terrible gas mileage. roughly 10 mpg. It has a rough idle and i do smell fuel in the oil. I have also had a mechanic hook it up to a cpu to try and get an idea of where to start and it said misfireing randomly. (And ABS, but thats not the big issue) Any thoughts? Or should i just go to a dealership and have them take a look. Any help would be greatly appreciated.
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Tom Greenleaf
Ultimate Carjunky
/ Moderator
Jun 1, 2007, 4:51 AM
Post #2 of 2
(2653 views)
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Re: 96 tahoe. rough idle & bad mileage
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Did it have the rough idle before this tune-up? They didn't notice either way?
Fuel smell in oil is hard to know. That gas mileage could be normal depending on how you drive. I have the same engine an can get 17+ steady on HWY but less than 10 with just the 3 to 5 mile round trips I normally use it for.
This engine is noted for intake manifold gasket problems most have been coolant leaks though.
A vacuum leak could cause the random misfire and not sure but might fool the ABS and did in another make of vehicle.
Fuel injector leaking could cause the misfire also,
T
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