Question about 1994 Mercury Sable
Engine stumbles (best word I can come up with) while cruising. Does fine under acceleration. Occasionally will idle roughly. Disconnected vacuum line to the EGR valve and problem seemed to go away for awhile, but is now getting worse. Car has had engine replaced twice by dealer so possible wire or vacuum routing problems could be in play. I replaced the EGR valve with no improvement. Current engine has about 60,000 miles.
The car's wiring can be tested in the normal fashion (see our article on Automotive Circuit Testing here), and all vacuum lines can be checked easily for cracks, leaks and correct routing. the easiest way to test the 3 remaining components: the EGR valve, EGR vacuum regulator and DPFE sensor (or similar flow sensor). So if you have a scan tool hook it up and let's go, if not read on and we'll get around that too!
Posted on Oct 22, 2008
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Posted on Jan 02, 2017
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