1993 Ford Taurus idles rough

1993 FORD TAURUS
200,000 MILES • 6 CYL • FWD • AUTOMATIC
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BENJAMMIN5150
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  • 1 POST
I have a 93 ford taurus SHO, I am having problems with rough idle and bucking at steady throttle but only at low RPM. Over 3000 seems to run fine.
I replaced the IAC, cleaned the MAF sensor.
I pulled the codes and it said "does not detect EGR valve opening". The EGR valve is pretty new without much carbon build up and i cleaned the EGR passage port in the intake, but symptoms remain. The codes also said weak # three cylinder, the wires have around 40,000 miles on them, Would a bad wire cause these symptoms?
Mar 17, 2009 at 7:14 AM
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JGAROFALO
  • ✓Experienced Mechanic
  • 489 POSTS
Sounds like you have a cylinder with low compression. I would recommend that you start by doing a compression test. If the compression on the weak cylinder is low, try putting a couple of squirts of motor oil into the cylinder and retesting. This will isolate between a burned valve and piston ring problems.

A bad wire will tend to give a dead cylinder, and will generally affect its companion cylinder on a DIS system.
Mar 18, 2009 at 10:34 AM
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