1989 firebird fuel economy problems
05-09-2018, 10:53 AM
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Car: 1989 Firebird Formula 350
Engine: 5.7L Vortec
Transmission: 700R4
1989 firebird fuel economy problems
I recently got my 89 Formula 350 on the road and had some fuel consumption problems. After running through about three quarters of a tank I realized my gas mileage was well under 10 mpg. I am running a 98 vortec with the scoggin dickey aftermarket manifold. Mostly everything else is stock except for the fact that we bypassed the EGR. Going to check throttle position and MAF. Any other guesses what could be causing the poor mileage?
05-09-2018, 12:51 PM
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Car: 1989 Firebird Formula 350
Engine: 5.7L Vortec
Transmission: 700R4
Re: 1989 firebird fuel economy problems
Yes the check engine light is on and will probably stay on forever due to the EGR. Getting codes 33, 34, and 45: two are about the MAF and one is the EGR I believe. Injectors will be the last things to mess with because I really don't want to have to pull the top end off again.
Just realized I posted this in the Body forum, oops
Just realized I posted this in the Body forum, oops
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