~83K miles. Starts great. After a few minutes, idle gets rough. Can't
hear any vacuum leaks, no "check engine" lights on. Bought one of those
plug in engine testers. That tells me the EGR may be malfunctioning.
Questions...what exactly does the EGR do, route some exhaust back to the
engine to burned again, right? Could a malfunctioning EGR cause these
symptoms? Thanks in advance.
Gary in NC
My 1983 grand marquis has had problems with the EGR valve; every once in a
while a carbon deposit will build up inside it, and eventually gets big
enough that it holds the valve open. What ended up having to be done (each
time this happens) was take the vavle off, and use a vacume pump to open it
fully, and then blow the build-up out of the valve with an air compressor.
I haven't actually had this problem in probably a couple of years. Every
once in a while, I'll get out on the highway and run the throttle wide open,
with the intent to blow out any small deposits before they get large enough
to cause trouble.
I don't know if this actually helps.... but I like to think that it does :-D
I'm kind of a lead foot anyway....oh well.
But like Mr. Moats said, there are a number of things that can cause a rough
Motorsforum.com is a website by car enthusiasts for car enthusiasts. It is not affiliated with any of the car or spare part manufacturers or car dealers discussed here.
All logos and trade names are the property of their respective owners.