Service Engine Soon Light????? - Team Camaro Tech
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Old Mar 26th, 09, 04:41 PM   #1 (permalink)
 
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Service Engine Soon Light?????

i have a 1994 camaro Z28. Sometimes when im driving the light will come on for no reason?As soon as i shut the car off it goes away?it doesnt do it everytime i drive it either, usually when i drive it for say like 45 minutes or more.One time it came on for like twenty minutes then when out while i was driving.Whats going on, do i have a problem here??id appreciate any help, Thanks.
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Old Mar 26th, 09, 05:37 PM   #2 (permalink)
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Re: Service Engine Soon Light?????

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Originally Posted by broncoman7 View Post
i have a 1994 camaro Z28. Sometimes when im driving the light will come on for no reason?
Actually..the ses warning lamp does come on for a reason.The pcm is pi$$ed off with something and illuminating the ses lamp is how the controller alerts you to a take action sans a driver information center (dic).
I do believe Autozone will scan for stored dtc,s for free.Take advantage of the offering and then repost their findings.
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Old Mar 27th, 09, 06:50 AM   #3 (permalink)
 
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Re: Service Engine Soon Light?????

Ok I get what you are saying here because my 1993 camaro does the same thing the light comes on and goes off for no reason. I went to autozone and they tested the car. NOthing showed up they told me nothing was wrong with the car the light just comes on and goes off.

They never got it to flash any codes. And I took it back to have someone test it to see if the first guy did it wrong . Still the same no answer.
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Old Mar 27th, 09, 02:26 PM   #4 (permalink)
 
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Re: Service Engine Soon Light?????

thanks for the info i will let you know what comes up.
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Old Mar 29th, 09, 06:59 AM   #5 (permalink)
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Re: Service Engine Soon Light?????

im betting its EGR related
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Old Mar 29th, 09, 07:07 AM   #6 (permalink)
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Re: Service Engine Soon Light?????

no bets. codes.
Light does NOT ever come oin for no reason.
and no guessing allowed. Read the codes, codes tell you why it's po'd.
Could be something as silly as a bad gas cap seal. Could be just about anything tho. Is not real serious / not a constant failure or the light would stay on.

Very possible you'd do better doing the scan when the light is on.



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Old Mar 29th, 09, 08:54 AM   #7 (permalink)
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Re: Service Engine Soon Light?????

The codes will give you a good place to start looking for the problem, but they don't always pinpoint the real issue. Some of the common codes that come and go are for misfires, AIR, EVAP. But it could be any sensor that is getting old and starting to read out of range. Have it scanned and see if there are any stored codes.
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Old Mar 29th, 09, 08:39 PM   #8 (permalink)
 
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Re: Service Engine Soon Light?????

appreciate it guys. going to check it out tomorrow.ill let ya know what it is, thanks.
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Old Mar 30th, 09, 04:04 AM   #9 (permalink)
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Re: Service Engine Soon Light?????

The guys at autozone are retards when it comes to explaining whats going on with your car ,they are not trained in this feild..if they cant plug it up to your car and get the code and then read the book to tell you what it means, go to your mechanic and have him scan your car!!
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Old Mar 30th, 09, 06:13 PM   #10 (permalink)
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Re: Service Engine Soon Light?????

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Originally Posted by carmennikole View Post
Ok I get what you are saying here because my 1993 camaro does the same thing the light comes on and goes off for no reason. I went to autozone and they tested the car. NOthing showed up they told me nothing was wrong with the car the light just comes on and goes off.

They never got it to flash any codes. And I took it back to have someone test it to see if the first guy did it wrong . Still the same no answer.
carmen..not sure what type of tool the autozone guys use to read codes.I have never used their free service myself.In the interests of saving a buck or two for tc members,it is a starting point only.
If you are still troubled by the MIL(malfunction indicator lamp)turning on randomly..then a full scan with a tech 2 in the right hands and sub menus available will help zero in on why the pcm felt the need to illuminate the MIL.
To add to the confusion,dtc,s can be ranked in abc types.Type A will require only 1 fail to light the lamp..a B type will require 2 failures..a c may never lite the lamp but go to history only.A random p0300 misfire may turn on the lamp and not set a code but store the cyl misfire in a sub menu in the engine data list if the misfire did not last long enough to become a type a code.There are acceptable/non acceptable little windows that open and close on and off depending on the type of test being run at the time.If your issue returns..I suggest visiting your local Chevy store and the initial diag time should be a reasonable 1 hr checkout at what ever their door rate is.Locations around the country will vary obviously.
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Old Mar 30th, 09, 08:19 PM   #11 (permalink)
 
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Re: Service Engine Soon Light?????

yeah, they didnt really tell me anything.....Surprise, they said nothing is wrong.well i guess i could take it somewhere else.the car really does run great. cant seem to find anything wrong with it or why that light would even come on.
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Old Mar 31st, 09, 05:47 AM   #12 (permalink)
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Re: Service Engine Soon Light?????

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Originally Posted by broncoman7 View Post
yeah, they didnt really tell me anything.....Surprise, they said nothing is wrong.well i guess i could take it somewhere else.the car really does run great. cant seem to find anything wrong with it or why that light would even come on.
the code should be stored, just take it to them and ask them to read the codes and give you the code, they should be able to do that.
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Old Mar 31st, 09, 06:45 AM   #13 (permalink)
 
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Re: Service Engine Soon Light?????

When I had it ran the first time the S.E.S light was on and he could not get any codes to read.

The second time the light was on the he ran the test and the light went off and stayed off for about 20 mins then back to the same on and off on an off when ever it wants to.
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Old May 2nd, 09, 08:03 PM   #14 (permalink)
 
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Re: Service Engine Soon Light?????

I am willing to bet that its just the sensor on the light that mayb has a faulty wire.
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