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rough idle, smelly exhaust 200 1985

posted by  someone claiming to be TomD on  Wed Sep 18 02:18 CST 2002 [RELATED]

brickstr,

Check the Fuel pressure regulator (FPR) to see if it has a pinhole leak and is letting gas into the intake via the vacuum line. You can do this by pulling the vacuum line off the FPR and see if you smell gas there.

Since you believe the AMM is good, have you checked the O2 sensor voltage?

'85 was a year with the biodegradable wiring harness so you may have some problems there. Check the temp sensor (under intake runner #3) wiring. Often it is bad. If it is not making proper contact or the sensor has gone bad, it interprets the temperature as "extremely cold" and the computer causes the injectors to dump in extra fuel.

Just a couple ideas, hope some others will jump in...

Good luck,

TomD
'86 240
'93 240






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