1st Generation Specific (1979-1985) 1979-1985 Discussion including performance modifications and technical support sections

exhaust overheat light came on, should i just remove the cats?

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Old Dec 15, 2011 | 07:16 PM
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exhaust overheat light came on, should i just remove the cats?

i hink that maybe why im getting bad gas milage also.

What would you guys do? no emissions out here. thanks
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Old Dec 15, 2011 | 08:01 PM
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You're very ruch, causing the cats to glow. Fix the intake and get a wideband.
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Old Dec 15, 2011 | 10:09 PM
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something needs to be wrong for that light to be on, or if you're missing the big heat shield that goes between the cat and the floor.

things to check would be the throttle position sensor, air control valve, and um maybe the carb? you don't need to worry about the cats, they were dead before the light came on
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Old Dec 15, 2011 | 10:33 PM
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which one is the exhaust overheat light?
Never seen it, may be a good thing i guess
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Old Dec 16, 2011 | 04:26 AM
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Originally Posted by j9fd3s
something needs to be wrong for that light to be on, or if you're missing the big heat shield that goes between the cat and the floor.

things to check would be the throttle position sensor, air control valve, and um maybe the carb? you don't need to worry about the cats, they were dead before the light came on
The carb was rebuilt a month ago and the car runs perfect. The light came on the other day as soon as I turned the car on and then went away. Car was cold. Prev owner said the system was checked out and everything was fine. That it would just pop up and then you won't see it for 2 months. That's exactly what happened.

I just wanted to know if I should take the cats off for better gas milage.

Last edited by Touring; Dec 16, 2011 at 04:31 AM.
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Old Dec 16, 2011 | 05:27 AM
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Maybe the cats are clogged or not functioning right and overheating?

In any case, I would replace the cats with a bonez race pipe, better gas mileage, more HP and nicer sound.

It's a quick easy install and you can sell your cats to Matt Brown for $170, more than enough to buy the race pipe from Rotary Performance (http://rx7.com/)
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Old Dec 16, 2011 | 06:21 AM
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Originally Posted by ray green
Maybe the cats are clogged or not functioning right and overheating?

In any case, I would replace the cats with a bonez race pipe, better gas mileage, more HP and nicer sound.

It's a quick easy install and you can sell your cats to Matt Brown for $170, more than enough to buy the race pipe from Rotary Performance (http://rx7.com/)
you rock!!! thanks
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Old Dec 16, 2011 | 07:01 AM
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Here's the Matt Brown link for recycling your cats for fun and profit:

https://www.rx7club.com/se-sale-wanted-classifieds-180/wtb-stock-rx7-catalytic-converters-958819/
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Old Dec 16, 2011 | 05:55 PM
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thanks for the link ray.

While i was working on trans fluid issue today i noticed that the cats were glowing red.... im pretty sure they are clogged....

just put a order in for the race cat. thanks again
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