85 sentra will not idle after warmed up

tendadpe · Jan 12th, 2006, 11:08 AM

I have changed distributor cap, plugs, vacuum lines, checked for vacuum leaks with wd40, Car goes dead when it is warmed up. Restarts fine with foot on gas. Car runs great but idle speed varies up and down as it warms up.
Has new timing belt, head job 12000 miles ago.

B11sleeper · Jan 12th, 2006, 12:24 PM

Don't those have a thermostatic vacuum switch? it's got 3 ports on it?
there is also a sensor with 2 wires for the ECU to monitor coolant temp.

the short answer is that you have a thermal switch that is bad. it might be a vacuum switch or it might be electric, but it's something that changes once the car warms up.

tendadpe · Jan 13th, 2006, 04:58 AM

Quote:

Originally Posted by B11sleeper

Don't those have a thermostatic vacuum switch? it's got 3 ports on it?
there is also a sensor with 2 wires for the ECU to monitor coolant temp.

the short answer is that you have a thermal switch that is bad. it might be a vacuum switch or it might be electric, but it's something that changes once the car warms up.

Yes there is a thermostatic Vacuum switch.
I idled the car up with the adjustment screw, pinched off one of the hoses and the car idled higher when the hose was pinched off... for a few times, then it did not idle up when I pinched off the hose.?

There is a little fuel dampness below a "window" in the passenger side of the carb? Could this be a contributing factor?