rcargile

I am noticing mild hesitations at around 40 mph, and have read the threads on 95 and newer EGR valves and disconnecting or deleting them. My 92 valve is vacuum operated, but I wonder if it could be contributing to these symptons? Would disconnecting the vacuum and plugging lines be sufficient to at least test if there is an operating improvement? I have cleaned the small filter under the cap with no improvement. My car has 142k miles and is bone stock.

6SOARER

iTrader: (20)

Too much EGR will cause hesitation. Try disconnecting the vacuum line to the EGR to see if that helps.

rcargile

There are two lines to the EGR and another to a module nearby. I guess I could try one at a time to check for improvement.

TWong350

iTrader: (8)

Your EGR modulator may have gone bad. You can check a couple of things. On the modulator, you can snap off the top cap and check for signs of carbon build-up. The other things to do is use a vacuum pump attached to the bottom part of the value. It should hold a vacuum. It it doesn't, then you have a bad EGR modulator.