Bad Gas Milage
#1
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Location: Okc, ok, usa
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Bad Gas Milage
Just looking for opionons from you guys. I have a 350 crate engine with a TPI with 3.42 gears. I noticed latey that my fuel economy has dropped off quite a bit. I haven't made any changes lately and I haven't been mashing the throttle either. Any suggestions on the sudden drop in milage? I have tested the pressure and am sitting at 45psi and replaced spark plugs and such. Is it possible to have oxygen sensors kill your milage?
#3
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I usually foul out plugs with a year or maybe a little more and it always smells rich..especially at start up. When I did the tpi and engine swap I don't believe I replaced the oxygen sensors and that's been about four years ago. I have always noticed the strong fuel smell...any ideas?
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I have 23# accel injectors and I use an adjustable fuel pressure regulator. I haven't really had any issues with the milage till recently..Is it ok to back off the pressure very much with bigger injectors?
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nothing as of yet..it was a foreshadowing thought. I am planning on better heads and a bigger cam and I needed new injectors so i planned ahead. I have never had a problem with them as far as killing my milage. I had another thought, I noticed my car trying to rev while I was sitting still and I wonder if my tps is going bad...will that kill your milage if it's reading the tps wrong?
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#9
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Car: 1991 camaro RS
Engine: 350,vortech heads,zz4 cam,3:73 posi trac,edelbrock carb,wiend stealth intake,raven mufflers,hooker supercomp shorty headers and y-pipe.
Transmission: th700r4
Have you checked for any leaks on the exhaust sustem?
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