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Poor gas mileage FROM HELL

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Old 05-28-2015, 05:17 PM
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Car: 85-6 TA 85IROC 82-6 MSE 15th/83pace
Engine: Slow ones
Transmission: 700R4/T5
Axle/Gears: Weak ones
Poor gas mileage FROM HELL

Title says it all. I am getting very bad MPG in my car. I only get about 7-9 mpg. My car only has about 80k miles on it, and i am the 3 owner. She seems to be stock but it has a little more get up and go then i would expect out of it. Now, I checked the #1 plug and it looked fine (that's what everyone has told me to do). The car idles fine at about 1k (more like 900ish). The car is also not throwing any idiot lights. Not sure what to do from here.
Old 05-30-2015, 12:34 PM
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Car: 92 Firebird, 77 Trans Am SE, 86 Z28
Engine: 5.7 HSR, T/A 6.6, empty
Transmission: T-5, TH350, T-5
Axle/Gears: 3.08 posi, 3.23 posi, 3.23
Re: Poor gas mileage FROM HELL

Originally Posted by t/aws61985
The car idles fine at about 1k (more like 900ish)
That's way too high. Try resetting the iac and set the tps. And look for vacuum leaks or a sticking egr valve.
Old 05-30-2015, 03:59 PM
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Car: 87 Iroc
Engine: modified 350
Transmission: high performance built 700R4
Axle/Gears: Strange S60 3:73
Re: Poor gas mileage FROM HELL

I agree you have a vacuum leak some ware.
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