Sinking Feeling
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Intermediate
Joined: Dec 2004
Posts: 27
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Sinking Feeling
My 89' six speed will noticealby lose horsepower and give me a check service engine light as soon as it has reached operating temperature. Most of the time the light will stay on only for a brief period of time. A few times it has stayed on for the duration of the drive. My car has no catalytic converter, however, the pre-cats are still on the car. The original car clogged and had to be removed. I am wondering the same about the pre-cats. I am also wondering if I may have an injector going bad. The kicker is it only does it when the outside temperature is below 65 degrees. I have not experienced this above 70.
Race Director
Joined: Nov 2003
Posts: 12,221
Likes: 446
From: Overland Park Kansas
2020 Corvette of the Year Finalist (appearance mods)
C4 of Year Winner (appearance mods) 2019
Also, some local auto parts shops (like Advanced Auto) will scan codes for you for free.
(BTW: It's probably not your front cats. After all, they'd be clogged when cold too!)
