My car didnt pass emissions, will be the fourth time I am going back. Didnt past the nox and the co for the gas tests. now i take car to get vaccum hose leak fixed, new spark plugs, and new fuel filter put on car. Pick car up and car is hesitating worse than before I took to shop. Why is is doing this? EGR valve?
WHERE IS THE EGR VALVE AND HOW DO YOU CLEAN THE EGR VALVE? on 1993 Oldsmobile Cutlass Ciera
by Visitor in Denver, CO on March 28, 2011
ANSWER by Visitor on March 28, 2011
The first thing I would suggest is take the car back to the shop that did the work and ask them to find out why it is hesitating. Then find a quality shop that will guarantee their work and have the emissions failure diagnosed. The shop should offer to get the car retested after the repairs are made. Be prepared to pay for a diagnosis and a repair. You can take the shotgun approach and throw parts and repairs at the emissions failure, but in the long run it would be cheaper to have the failure diagnosed first.
ANSWER by frontrangefleet on May 09, 2011
The EGR is on top of the intake manifold. Once you remove the EGR you can use a stiff steel brush to clean out the passages of the intakemanifold. (a non-opening EGR or pluged EGR passages can cause high NOX) For the hesitation, I would check the mass air flow sensor, it may be fouled. Give us a call, we would love to look at the car for you and diagnois it.
ANSWER by martyjr on September 03, 2011
there isn't a egr on mine. i went to the dealer.they told me where to look for it then i had them look and said this year doesn't come with one i have the same car i had same problem it was the catalytic converter