joeym4130
15+ Year Contributor
- 296
- 2
- Dec 8, 2003
-
philly,
Pennsylvania
Well my idle is still surging on my spankin "new" 91 talon 
. Very annoying I must say . Mine is the case where the idle surges between 1200-1500RPMs. Here is what went on so far, maybe you guys can help me finish the job. 
The car will idle a bit high, but steady when started cold. After about 2mins of sitting, the idle will start its surging cycle. Never stalls, just stays between 1200-1500
The car surged when I got it. So far, I have:
-Adjusted the BISS screw using proper procedure. O-ring is present, screw has no effect once sensors are back connected.
-Checked + adjusted IPS, checks out properly
-Checked the ISC motor. It had a bad coil and wouldnt operate properly so i got a used one from a boardmember. This one operates just fine, the pintle moves in/out smoothly when key is turned to "on" and power is applied.
-Cleaned out TB
-No vac. leaks i can find
-EGR valve blocked off
Im pretty much lost now. all I can think of is FIAV, but how can one check that? Or the o2 sensor, but I seem to be getting readings from it and there is no ECU code...but i am new to these cars, can the o2 go bad w/o being easliy detectable? And another note on the FIAV, I know that it operates w/ coolant hoses that attatch to the TB, is there a diagram online anywhere of how these lines are routed?? Cause on my car it appears that there are two ports on the underside of the TB, where it appears coolant lines would have hooked to, but I have none. Is that for the FIAV?? I havent the chance to research the FIAV much, and cannot find much anyway. Or i guess a remote possiblity of the bad ECU? but i doubt it? b/c i am having no other problems with anything. Please give some advice, im lost now! haha i cannot think of anything else...and I dont want to buy a new TB just yet, w/o exhausting every other option! Thanks a million!
. Very annoying I must say . Mine is the case where the idle surges between 1200-1500RPMs. Here is what went on so far, maybe you guys can help me finish the job. The car will idle a bit high, but steady when started cold. After about 2mins of sitting, the idle will start its surging cycle. Never stalls, just stays between 1200-1500
The car surged when I got it. So far, I have:
-Adjusted the BISS screw using proper procedure. O-ring is present, screw has no effect once sensors are back connected.
-Checked + adjusted IPS, checks out properly
-Checked the ISC motor. It had a bad coil and wouldnt operate properly so i got a used one from a boardmember. This one operates just fine, the pintle moves in/out smoothly when key is turned to "on" and power is applied.
-Cleaned out TB
-No vac. leaks i can find
-EGR valve blocked off
Im pretty much lost now. all I can think of is FIAV, but how can one check that? Or the o2 sensor, but I seem to be getting readings from it and there is no ECU code...but i am new to these cars, can the o2 go bad w/o being easliy detectable? And another note on the FIAV, I know that it operates w/ coolant hoses that attatch to the TB, is there a diagram online anywhere of how these lines are routed?? Cause on my car it appears that there are two ports on the underside of the TB, where it appears coolant lines would have hooked to, but I have none. Is that for the FIAV?? I havent the chance to research the FIAV much, and cannot find much anyway. Or i guess a remote possiblity of the bad ECU? but i doubt it? b/c i am having no other problems with anything. Please give some advice, im lost now! haha i cannot think of anything else...and I dont want to buy a new TB just yet, w/o exhausting every other option! Thanks a million!
its horrible! haha
) I am getting a reading of 0.00V - 0.01V from the o2, is it supposed to read anything else at idle? I wish it was a broken o2, that would be anice easy fix....
