1998 Chevy S-10 Gas mileage horrific

1998 CHEVROLET S-10
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DWINEINGER
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Engine Performance problem
1998 Chevy S-10 6 cyl Two Wheel Drive Automatic

After a late night tired change to the air filter, the gas mileage on my S10 has gone down insanely. (It seems like a semi gets better gas mileage). the only bit I can think about is that I thought atm was that I was thinking it was an older car with the air filter on the carb, and not a throttle body. So I'm trying to figure out what could possibly have caused the gas mileage to plummet.
Mar 21, 2009 at 7:13 PM
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BLACKOP555
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what did u do? and how much did the gas mileage drop.

im not understanding what your trying to say.
Mar 21, 2009 at 11:02 PM
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DWINEINGER
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Some time ago I needed to change the air filter on my 1998 Chevy S10. With the late hour and being in somewhat of a rush I inadvertently removed the cover of the throttle body as this is where the air filter would be on my 1993 Chevy 1500 - center of engine compartment with the carberator. Unfortunately this is not where the air filter is located on the 98 S10. When I realized the error I immediately replaced the cover and removed the correct cover on the air filter in the lower right-hand corner of the engine compartment. Afterwards an intermittent high-pitched whistle developed and the gas mileage dropped. The usually 18 to 20 mpg became something more like 12-15 or, perhaps, less. It cost so much to drive that I have parked it until I can locate the cause. It seems as though I may have somehow created a vacuum leak. I had thought it may have resulted from a broken or warped seal but have been told the throttle body has not seal or gasket.
Mar 22, 2009 at 1:10 AM
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BLACKOP555
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can you get a picture of what you took off?

there should be a gasket on the throttle body.

with vehicle running take a stethoscope or a piece of fuel line and listen to where the whistle is coming from.

was it properly torqued back on? all vaccum lines connected?
Mar 24, 2009 at 8:21 PM
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