Bought a 95 Buick Riviera from a small dealer in North Carolina. This car came from Virginia and the CarFax said it passed an emission test every year until its last check in Oct 2006 at
42,000 miles. It now has 45,000 and the test drive went well. On the drive home the check engine light came on with no performance loss or rough idle or rotten egg smell from the exhaust. When you shut it off the check light does not come on. Sometimes will come on after a few miles and other times I have gone 40 miles and it never came on.I went to 2 AutoZone stores to let them scan for a code but at both places an elderly person was using the scanner and both places could not get the scanner to communicate through the aldl connector. (I suspect they needed a different connector)
I went to another shop and I don't know how the fella said got a code about the EGR valve. They said $60 to clean the ERG valve. Seems to me if it were and ERG problem the light would be on right away. I talked to the original owner and although it has a supercharged engine he never ran anything but regular unleaded gas. Would you go with the ERG cleaning for $60 or try something else?
snipped-for-privacy@yahoo.com