Topic: Check engine light
in Forum: C4 General Discussion
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lanoka harbor, NJ - USA
Joined: 3/22/2009
Posts: 1363
Vette(s): 1990 L-98 white/ red/black leather interior targa top auto
1975 L48 blue/black leather interior t tops auto
redvette89 said:
only if they are obdII which most of the c4s are not. some 95s may have it but in 96 is when they changed over to obdII.Does anyone know if the engine check diagnostic service from Auto Zone, NAPA, O'reillys, Carquest, etc will work on our C4's ? And if so, is it good for some years but not for others? I've taken a few vehiles from the early 2000's to our local AutoZone to get the codes read and it was great. But I'm wondering if this applies to our Vette's ?
Anybody know .....
if you jump the a and b terminals on your aldl plug you have to count the flashhes of the ses light. it starts with 12 which is the computer check when you first enter diagnostics. one flash and then two quick flashes. then if any codes are stored count the flashes in the same way and then look up in service manual.
the dynamic duo
c3vr life member #97
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I've never had much luck with AutoZone where I live. But I could give you the name of a great mechanic if you live in the Phoenix area!
Love my C4!
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lanoka harbor, NJ - USA
Joined: 3/22/2009
Posts: 1363
Vette(s): 1990 L-98 white/ red/black leather interior targa top auto
1975 L48 blue/black leather interior t tops auto
rita, you have a 96 if i am not mistaken so you should have no trouble as yours should be obdII. maybe the help doesnt know how to operate the scanner? try jumping the a& b terminals ans shouls show up on your dash display. many books out there have the codes listed.
the dynamic duo
c3vr life member #97
Nope, mine is a 95. Could still be the inability of the associate at AutoZone to get my codes. I have had someone help me get codes using the method posted. But now I have a good mechanic and if I mess up trying to do it I just go get him to help.
Love my C4!
96 and later would be OBDII. Some late 95s may have it as well. Easy to tell as the older data link is rectangular and the OBDII is trapezoid in shape. I wouldn't do anything without using a scanner to identify the problem. You can buy ones online that do virtually every car model (which is what I use from AutoXray) since 1980, for a couple hundred bucks or some that are for the pre-1996 manufacturer specific data links. These units run about 50-100 bucks. Some basic OBDII units are also available. You ca buy code scanners online or from Autozone, NAPA, or any major auto parts store. Without scanning your car's computer you are just guessing. It literally could be any one of a hundred problem, including something as simple as a loose connector. So, get it scanned or buy a scanner (you'll be glad you did).
There is no problem a little horsepower can't fix!
C4s: 1993 LT-1 coupe, 6-Speed, White w/black
1986 L-98 Coupe, 4+3 Trans, Satin Black w/red-black interior - SCCA Time Trial racecar.
C3: 1979 L-48 couple, auto, Red w/doeskin interior.
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Roscommon, MI - USA
Joined: 9/13/2009
Posts: 24
Vette(s): 1991 Coupe L98 Turquoise with spoiler and Black interior
If your check engine light was on for 5 minutes don't worry about it yet it could be weather related (i.e. cold, damp, both etc). But as your Vette gets older thing happen. I have been driving with my check engine light on for about 2 years now (91 Model) and running great. However I recommend buying a Diagonostic tester for peace of mind, i have an InNova Tester that handles both OBD I and II and it works great on my vette OBDI and my other vehicles with OBDII. It helps to know what you are facing when you take a car in for repairs also.
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Bandera, TX - USA
Joined: 1/4/2012
Posts: 28
Vette(s): one ea. 1996 LT1, red on gray interior, stroker 383 Dart heads w/ 2.02"int,1.60exeh 11.8:1, Comp Cam 230/236@50 .570/.576 113LSA , Crane 1.6:1`rocker arms, GM Delphi roller lifters HiFlo Cats, Xpipe and low restriction muffles, it sounds lumpy at idle!!!
I am having the same problem and have a recording module pluged in the OBD II under the dash. One reason the light will flash then go out is a misfire. I replaced a set of plugs and stopped the ECU from setting a hard code. My injectors are new but I can't help but think the sound that I hear when the check eng. light flashes is fuel related, either rich or lean. I am also changing the fuel filter. There could be water in the fuel from condesation or from the pump. I hope to have more tommorrow. JRB
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Bandera, TX - USA
Joined: 1/4/2012
Posts: 28
Vette(s): one ea. 1996 LT1, red on gray interior, stroker 383 Dart heads w/ 2.02"int,1.60exeh 11.8:1, Comp Cam 230/236@50 .570/.576 113LSA , Crane 1.6:1`rocker arms, GM Delphi roller lifters HiFlo Cats, Xpipe and low restriction muffles, it sounds lumpy at idle!!!
Do not jump the terminals on the connector under the dash on your OBD II, or you could and then you will know why I wrote this! JRB
I have 96 LT4 and mine goes on occasionally. Previously, there was some trash in the intake of the AIR causing the light go on. You might want to check that. So far, when the light goes on, everything seems to function fine. Keep in mind most of the error codes revolve around the emissions systems.
in Forum: C4 General Discussion
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