No codes, but running rich
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Junior Member
Joined: Jul 2006
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No codes, but running rich
What would cause a 305 TBI to run rich, yet throw no codes?
A search really didn't reveal much, other than the coolant temp sensor. I'll probably replace it, but if it's still running rich, what else could it be? The timing?
A search really didn't reveal much, other than the coolant temp sensor. I'll probably replace it, but if it's still running rich, what else could it be? The timing?
Senior Member
iTrader: (1)
Joined: Jul 2007
Posts: 1,141
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From: MA
Car: '87 IROC/'68 SS
Engine: 5.7L/350
Transmission: 700R4/Muncie 4-spd
Axle/Gears: 3.27 9 bolt / 3.31 12 bolt
Re: No codes, but running rich
Supreme Member
Joined: Jul 1999
Posts: 1,556
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From: Adrian, Mi, USA
Car: 1988 Pontiac Firebird Formula
Engine: 5.7 TPI
Transmission: 700R4
Re: No codes, but running rich
And again, what leads you to believe it is running rich? If the O2 sensor is lying to the computer, giving false lean readings, the computer will happily dump more gas, and not set any code......
Junior Member
Joined: Mar 2006
Posts: 79
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From: Center Valley, PA
Car: 88 Monte Carlo
Engine: 305
Transmission: Auto
Axle/Gears: Really Tall ones. Probably 2.73's
Re: No codes, but running rich
keep in mind an exhaust leak near the 02 can make the o2 read leaner than actual since it can draw a small amount of fresh air inbetween exhaust pulses. this will tell the pcm lean all the time, and usually never throw a code.
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