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cel light only comes on when driving

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Old 12-16-2011, 03:19 PM
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cel light only comes on when driving

my cel only comes on when i am driving my car when i start it and dont drive it is off but as soon as i start to go it comes on it runs fine i think i have never had a 305 i usually run a 350 so i am not sure if it is acting up it is a 86 305 tpi
t56 trans and borla cat back other than that it is stock any help on what my issue is would be great
Old 12-16-2011, 04:08 PM
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Car: 1967 Camaro, 91 z28
Engine: Lb9
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Axle/Gears: J65 pbr on stock posi 10bolt
Re: cel light only comes on when driving

what codes are you getting ?
Old 12-16-2011, 05:34 PM
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Car: '91 Formula
Engine: 305 TBI
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Re: cel light only comes on when driving

does the light go off after you stop? Need codes, this link explains how to do it yourself. https://www.thirdgen.org/service-eng...ht-error-codes

Mine is on too, but goes off sometimes. I know I need a new EGR valve, but it'll have to wait til i get the $90.
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