My 88 Sport Coupe 305 TBI (150K miles so far)is showing a check engine light. But only in overdrive and only after letting off the accelerator. The ALDL doesn't seem to be storing this code. Anyone have a similar problem?

 

could be a vacuum problem whn you let off the motor has alot of vacuum but may be sensing too much or too lttle

------------------
87 IROC-Z 305tpi
still $h!ten on
rustangs

 

I had the same thing happen to my car. The engine light came on when i was in overdrive and on the freeway but it has yet to come back on, but that might be because I have not been using overdrive. Im in college right now and cant really figure out whats wrong until either thanksgiving or christmas break. Search the boards, i read somewhere where people were having a similar problem and the problem was their EGR valve. But as of now, i really dont have a good idea whats wrong.

------------------
1990 5.0 TBI
1 5/8" Edelbrock TES headers, 3" Catco hi-flow series cat, 3" Aero-chamber cat-back, K&N 14x3 flat based open element, MSD 8mm Heli-Core plug wires, AC delete

 

EGR.

 

Thanks Vader, I like those simple, one word answers.

 

Vader

I replaced the EGR ($72.00)and the problem disappeared. Thanks again for the help.