Check engine light..

Pontiac gt94

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Hey I got a 94 grand am gt 2 door v6 3.1..ive had the car for almost a year and sence then my check engine light comes on when I decelerate like when I'm coming off the highway...I can drive around all day and it won't come on..when I turn the car off it will go off and only come back on when I decelerate off the highway..it still drives and shifts great so is this something I should be concerned about???
 
Welcome to the club ! 😂
I had a 93, 94 & 95 all GT's and they all did that.
All 3 I owned at the same time.
Problem went away when I bought a 96 GT.
They almost all did that.
If your oil if full and no motor sounds, keep on keepin on !
My 94 filled with rain water facing up a hill, my 95 filled sitting level, my 93 filled facing down hill.
I live on the side of a mountain.
It was funny to others on how I ran out to face the cars a certain way so they didn't become swimming pools.
Buy a 96 & up, they are better built.
 
Welcome to the club ! 😂
I had a 93, 94 & 95 all GT's and they all did that.
All 3 I owned at the same time.
Problem went away when I bought a 96 GT.
They almost all did that.
If your oil if full and no motor sounds, keep on keepin on !
My 94 filled with rain water facing up a hill, my 95 filled sitting level, my 93 filled facing down hill.
I live on the side of a mountain.
It was funny to others on how I ran out to face the cars a certain way so they didn't become swimming pools.
Buy a 96 & up, they are better built.
In the trunks?? Because mine used to do that due to a stud broke off one of my tailights..ended up having to get another tailight to stop that issue lol..and what's the reason for them doing that with the cel coming on??
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I actually found my tool I used years ago to pull codes..but I inserted it and nothing.. vehicle have to be on or off because I did both
 

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Key has to be on, engine off.
Have you checked for a blown fuse?
Which terminals in your picture are you inserting the tool, bottom far right?
 
Key has to be on, engine off.
Have you checked for a blown fuse?
Which terminals in your picture are you inserting the tool, bottom far right?
Bottom far right bottom is the only location for 2 pins..and no..you know what exact fuse??
 
On many cars it's the cigarette lighter or check owners manual.
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Generator light??
Alternator light along with check engine light for a couple of seconds before engine start.
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