That Service Engine Soon light!
Thread Starter
Advanced
Joined: Oct 2006
Posts: 95
Likes: 0
From: Catharpin VA
That Service Engine Soon light!
All,
I've looked through the historical threads and couldn't find anything . . .
My Service Engine Soon light comes on after about 1 mi. and stays on for 2-3 mi. Then it disappears. Occasionally it comes back on, but not often.
Any thoughts on this behavior from you experts?
Regards,
Hal
I've looked through the historical threads and couldn't find anything . . .
My Service Engine Soon light comes on after about 1 mi. and stays on for 2-3 mi. Then it disappears. Occasionally it comes back on, but not often.
Any thoughts on this behavior from you experts?
Regards,
Hal
Melting Slicks
Joined: Jan 2007
Posts: 3,332
Likes: 46
From: Bowling Green KY
Not sure this will help ya, but.....
The owner before me removed the cats and installed straight pipes back to the mufflers. he told me that the "service engine soon" light would come on after about an hour of easy driving. He said something about the oxygen sensor being removed and that was what causes the light to come on.
Drifting
Joined: Nov 2005
Posts: 1,324
Likes: 5
From: Charlotte NC
Pull any stored codes first. These links will help you if needed:
http://www.corvettebuyers.com/c4vettes/codes.htm
http://www.corvettebuyers.com/c4vettes/ecm.htm
That should narrow it down. My gut tells me you've got an O-sensor issue
http://www.corvettebuyers.com/c4vettes/codes.htm
http://www.corvettebuyers.com/c4vettes/ecm.htm
That should narrow it down. My gut tells me you've got an O-sensor issue
Le Mans Master
Joined: Oct 2003
Posts: 6,130
Likes: 2
From: seattle WA
Always good to state the year first. Yours is a 94, so I'm not sure if it has an EGR switch, but my 87 did the same thing and it turned out to be the EGR switch. Easier and cheaper than the EGR valve.
Le Mans Master
Joined: Jan 2006
Posts: 5,621
Likes: 207
From: Orlando FL
For the 94, connect 4 and 12 on the ALDL connector. Then turn key on (dont start) and it will run thru all the modules. Watch for module 4 which is the PCM codes, if any. Recycle key to see again.
Check this page for PCM codes for a 94.
http://www.corvettedoctor.com/1994_96_DTC_Codes.html
BTW – the EGR relay will throw a code, but the EGR valve will not (only vacuum operated).
Check this page for PCM codes for a 94.
http://www.corvettedoctor.com/1994_96_DTC_Codes.html
BTW – the EGR relay will throw a code, but the EGR valve will not (only vacuum operated).
Last edited by pcolt94; Jan 9, 2008 at 08:47 AM.
2nd Gear
Joined: Jan 2008
Posts: 2
Likes: 0
mine comes on and stays off for a long time. i finnaly took it to auto zone so they could scan it. comes out to be one of the 02 sensors. it don't cost you anything to scan. they can tell you what the code is and it gives you the location of the problem
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Le Mans Master
Joined: Jan 2006
Posts: 5,621
Likes: 207
From: Orlando FL
Have you changed the O2 sensor and did it repair the problem?
Yes you can go to A/Z and get the codes scanned, but the on board diagnostics is very good and will give you the same information right from your driveway. Unless you just want the assistance of A/Z and that would be a different story.
Drifting
Joined: Apr 2007
Posts: 1,339
Likes: 2
From: port charlotte fl
The owner before me removed the cats and installed straight pipes back to the mufflers. he told me that the "service engine soon" light would come on after about an hour of easy driving. He said something about the oxygen sensor being removed and that was what causes the light to come on.