Check Engine light

[TURBO6]

I have a 93 ATX SHO with 114k on it. The car runs fine except when you get on the highway at cruise speed. The check engine light comes on and dosen't go off until I get off the highway and slow down. It never comes on unless I am driving at highway speeds (70mph). I can drive all day long in town (30-50mph) all day and never see the light come on. What could be causing this? Thanks in advance!

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87 GN... 11.46 @118mph

 

[94ShoOff]

Welcome aboard! The only way to know for sure is to pull the codes.

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Steve


94'ShoMtx- too much time not enough $ (60K miles)
91'Sho- plus spoiler, po-po grill, Gen III chrome wheels(70K miles)
87'Grand National, 97'Ninja ZX7R
Wifes' rides- 93'ShoAtx(80K miles), 91'Corvette Conv.

 

[RStalveyARFF]

aww, we're just a big happy Turbo Regal, I mean SHO family!

 

[TURBO6]

Is there a way to pull the codes without a scantool?
I've been a GN owner for the past 5 years. I love turbo cars, but I've always wanted an SHO. When my wife and I got rid of her Mustang I decided to get the SHO. I can't say enough about the car. It's the perfect family car for the person that wants something different. The SHO is my wife's car and the GN is my toy.

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87 GN... 11.46 @118mph

 

[projectSHO89]

TURBO6

Here's the procedure:
http://www.shotimes.com/SHO3eeccodes.html


Steve

 

[97CaliSHO]

turbo6: The exact same thing is happening to me. Please keep me posted if you find anything out. I have a 97 SHO w/ 125K miles. [email protected]

 

[TURBO6]

Will do!

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87 GN... 11.46 @118mph

 

[fredhurderjr]

Sounds like O2 Sensors to me. Welcome aboard!

 

[Jayman]

Same thing happened to my '95' ATX but buddy at the Ford dealer scanned it and turned out to be the Hego sensor (O2)
Good Luck

Originally posted by TURBO6:
I have a 93 ATX SHO with 114k on it. The car runs fine except when you get on the highway at cruise speed. The check engine light comes on and dosen't go off until I get off the highway and slow down. It never comes on unless I am driving at highway speeds (70mph). I can drive all day long in town (30-50mph) all day and never see the light come on. What could be causing this? Thanks in advance!

 

[sdpatt]

Here is an even more descriptive site for the code testing.
http://www.dalidesign.com/hbook/eectest.html

Scott

 

[Jersey Fred]

O2 sensors and a clogged EGR caused the same problem for me but the EGR code didn't pop up. See where the codes get you.

 

[TURBO6]

Thanks guys for the replies. I was thinking the same thing. I haven't had the time to pull the codes but I'll keep you posted.

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87 GN... 11.46 @118mph