Go to the local parts store and grab a new tps. They are under $50. If it doesnt fix the issue, return it.
Certainly sounds like it's the culprit.
Certainly sounds like it's the culprit.
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Got one on order. Picking it up tomorrow. I will update tomorrow nightGo to the local parts store and grab a new tps. They are under $50. If I'DT doesnt fix the issue, return it.
Certainly sounds like it's the culprit.
An EEC failure can also cause constant 5vdc at the green TPS wire, but you'd have more than just a surging idle.If it isnt the TPS, then what else could it be?
Thanks for the info.An EEC failure can also cause constant 5vdc at the green TPS wire, but you'd have more than just a surging idle.
Have there been any recent changes to the car? When did the surging idle start?
It's worth running KOEO/KOER self tests. Even if the check engine light isn't on. See attachment.
In general, a base idle reset should help with surging idle. See attachment. I'd run codes first though.
Any tuner worth his salt should tell you not to try to tune it while there are any type of issues. Get everything fixed and all codes cleared first.
Have you tried running the car with the MAF unplugged? Factory unit?
I have not tried that
Did you get the new TPS?
Yes. I am getting the correct reading now. Still doesnt run right
Good to hear its functioning correctly now. Possibly back to a vaccum leak. Did you try checking for leak with carb cleaner?
I performed a smoke test on the system. No leaks to be found
Update:
Replaced TPS- Was able to get my .98V reading
Changed to a X3Z computer.
Performed Base Idle reset
Idle still surges a little bit
1/4 Throttle seems like full throttle and doesnt return to idle right away
I switched it because it is the X3Z computer that is specifically for a Cobra so I thought I would put it in there and see what happens.Why did the switch the ECM?
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If you have .98 vdc at closed throttle, your computer should register WOT at 3.69 vdc. (Closed throttle voltage plus 2.71). You could monitor the voltage as you open the throttle to see how soon you get there.
I spent a little time tuning the X3Z in my coupe. I'm no expert, but I do remember there is something that controls how quickly it returns to idle. @decipha would be the best person to help you figure that out over at EFIDynoTuning.com.
I loaded one of his base tunes on mine and my coupe ran much better. It was a night and day difference for me. Still kills me that I never got it back to the track after the initial tune changes.
I used a QuarterHorse by Moates. 'QuarterHorse' for Fords [QH1] - $249.00 : Moates.Net
Man Ive been away from foxes ive forgotten a lot.
So do you get a steady idle at the correct RPM and it surges once the IAC is plugged back in?
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