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CEL when braking

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Old Mar 13, 2012 | 04:23 PM
  #1  
NCcowboy's Avatar
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From: Eastern NC
Car: 85 sport coupe
Engine: 355 sbc
Transmission: 700R4
Axle/Gears: soon 4th gen 3.23 w/ Posi
CEL when braking

When I'm cruising down the road and I either apply brakes or even just let off the gas, my CEL comes on for like 10-15 secs and then cuts back off, nothing important but just annoying


As always, thanks!
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Old Mar 13, 2012 | 05:54 PM
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Re: CEL when braking

Are there any codes present?
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Old Mar 13, 2012 | 05:56 PM
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NCcowboy's Avatar
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From: Eastern NC
Car: 85 sport coupe
Engine: 355 sbc
Transmission: 700R4
Axle/Gears: soon 4th gen 3.23 w/ Posi
Re: CEL when braking

No, not when I scan it at the shop. Am I gonna have to scan it while driving?
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Old Mar 13, 2012 | 06:26 PM
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From: Not in Kansas anymore
Car: 82 Z28
Engine: 383 SP EFI/ 4150 TB
Transmission: T400
Axle/Gears: QP 9" 3.73
Re: CEL when braking

Originally Posted by NCcowboy
No, not when I scan it at the shop.
I have had occasional mystery CEL without any codes recorded
If engine appears to run right I wouldn't worry too much
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Old Mar 13, 2012 | 06:29 PM
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NCcowboy's Avatar
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From: Eastern NC
Car: 85 sport coupe
Engine: 355 sbc
Transmission: 700R4
Axle/Gears: soon 4th gen 3.23 w/ Posi
Re: CEL when braking

Ok, I guess I just didn't know if it was something with the brakes or something
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Old Mar 13, 2012 | 06:59 PM
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Car: 1984 Trans Am
Engine: LS1383 in work
Transmission: Magnum F - to be installed
Axle/Gears: Zexel Torsen 3.73, 28-spline mosers
Re: CEL when braking

Originally Posted by NCcowboy
When I'm cruising down the road and I either apply brakes or even just let off the gas, my CEL comes on for like 10-15 secs and then cuts back off, nothing important but just annoying


As always, thanks!
95% that it's your O2 sensor readnig a bit rich/lean because of the motor's work load change when you let off the gas. My 84 would do that until I got the Carb built and tuned right for my new motor. Still occasionally does it but if you're not able to pull any codes, I wouldn't worry about it.
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