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PKRWUD · 02-01-2002, 07:00 PM

I think this may be the first time I've ever disagreed with you, Scott, but I beg to differ on your TPS recommendation. While it is acceptable for a SD 5.0 Mustang to adjust the TPS that high, it is not advisable for a MAF 5.0 Mustang to exceed .95vdc. The MAF TPS has a narrower range, and the ECM is programmed to respond sooner than with the SD TPS. .995vdc will work, but is much too close to the 1vdc point for my tastes.

Anyway, I would suspect an EGR problem or a vacuum leak. They both will cause a rough, stalling idle, but have little or no effect on above idle drivability. The IAB valve should be inspected as well, especially if these symptoms go away after the engine warms up.

Take care,
-Chris

02-01-2002, 07:00 PM	#4
PKRWUD Junior Member Join Date: Mar 1999 Location: Ventura, California Posts: 8,981	I think this may be the first time I've ever disagreed with you, Scott, but I beg to differ on your TPS recommendation. While it is acceptable for a SD 5.0 Mustang to adjust the TPS that high, it is not advisable for a MAF 5.0 Mustang to exceed .95vdc. The MAF TPS has a narrower range, and the ECM is programmed to respond sooner than with the SD TPS. .995vdc will work, but is much too close to the 1vdc point for my tastes. Anyway, I would suspect an EGR problem or a vacuum leak. They both will cause a rough, stalling idle, but have little or no effect on above idle drivability. The IAB valve should be inspected as well, especially if these symptoms go away after the engine warms up. Take care, -Chris __________________ Webmaster: Rice Haters Club Jim Porter Racing Peckerwoods Pit Stop Support Your Local RED & WHITE!