eddonjan
Active member
91 vett check engine light comes on gos off comes on gos off should i be worried?
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It does this while driving.sometime I can drive for miles before it comes on,stays on for a while then goes off.My 93 does the same thing. When I check the code it is always H43 which is for the knock sensor. If the knock sensor was really reading a knock the ecm would go into limp home mode but it never does. This has been going on for over 4 years now. As near as I can tell it is temperature and or moisture sensitive to when it happens. You can run the codes to see if you have any. :bang
When you say comes on goes off do you mean while your driving. Or just when you start out it comes ont then goes off and stays off.
Depending on your climate change, it could be something as minor as the o2 sensors sending signals to the ecm that it's reading the exhaust gasses being adjusted. Easiest thing to do is just run a code scan.
Growing up my dads solution to the check engine light was to put a piece of electrical tape over it :eyerole
Yep out of sight out of mind I guess. If he couldn't figure out what it was and the car seemed to run okay that was his solution!
thanks,i should have also said the abs,low coolant lights do the same thing.they dont stay on but come on and off.i am not a wrench and do not work just trying to get a heads up before going to the shop.TAPE OVER A CK ENG LIGHT? What do you do for a living work at Walmart? Man, run your codes...if you can't then go to Autozone, They will run code checks for free. At least you'll find out if you have a warning of a soon to be expensive problem. Like if the CST is reading the thermostat is resonding slowly, Want to blow a head gasket? What if your fuel pump is spiking voltage...want to pay a tow bill when the pump fails. Corvette owners don't do that stuff, Fix your ride and be safe!
First thing I would do is,thanks,i should have also said the abs,low coolant lights do the same thing.they dont stay on but come on and off.i am not a wrench and do not work just trying to get a heads up before going to the shop.
thanks,
don
thanks, for your help.First thing I would do is,
1. Pull Codes and wright them down!!
2. Remove,Charge and Load Check Battery!!
3. Clean EVERY Ground connection Body,Engine Compartment and Engine!!
4. Check the connections on fuse-able Links,and the links themselves!!(Behind the battery!!)
5. If the Battery is Good,put it back in!! If Not, Replace It!! (If kinda Borderline Replace it!!)
6. Make sure the coolant level is correct and Fire it up and Check the alternator Voltage (13.8-14.9 is Perfect) while everything is running!!(Lights,A/C/High Blower)
7.Check Alternator for AC voltage slipping past the diodes!!(1-2 Volts is OK)
8. If all that checks out Drive it 100-300 miles and see if the light comes back on!! If so Recheck the codes and go from there!!
Growing up my dads solution to the check engine light was to put a piece of electrical tape over it :eyerole
What do you do for a living work at Walmart? !
I'm Guilty!!! My Corvettes all have a Rattling Squeaky Whining noise when the better half is on the passenger side!! I crank it Up and drowned it out!!!!I am also wondering if none of us ever turned our stereo louder to drown out a certain sound!
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