my daughters Jeep is a 98 tj 4.0. She got it wet the other day. I disconnected the clock spring. There was water in the plugs when I pulled them off. After drying for a few days the airbag and engine light are off. However she is getting a high idle 2000 rpm at park and neutral. She also said her oil pressure is reading higher. 45-60. She stated it never used to go above 40. It’s been about a week. I know the clock spring can cause bucking and stalling but would it cause a high idle. Could it also be affecting her oil reading. Trying to figure out if we have new problems or if the clock spring is just junk now. Any help would be appreciated
Can a faulty clock spring cause high idle?
- Thread starter Momsjeep
- Start date
I've heard more about the clock spring causing underhood problems in the past week here than I've heard in the entire time I've been driving jeeps.
For high idle I'd first check if all your vacuum hoses are ok, and especially are they connected at the intake. There's another thread on exactly this right now.
For high idle I'd first check if all your vacuum hoses are ok, and especially are they connected at the intake. There's another thread on exactly this right now.
@Jerry Bransford may know better, but a bad clock-spring can apparently screw with the data bus and mess with the throttle sensor I think. I’ll wait for him to chime in. Different than the idle control sensor but I could be mixing the two up.
Somebody said the TPS shares a ground with the clock spring. I guess I need to trace the circuits, because the TPS shares a ground with the cam, crank, oil pressure, and probably 5 other sensors, so I struggle to understand why the clock spring would specifically cause this problem but not F with the cam & crank (and therefore the ability to start or stay running). But the proof is in the pudding, so I vow to verify or disprove this clockspring ground tale.
Some other night. Tonight is a hot tub night.
It does screw with the tps signal. The code I was getting before she dried was the tps code. 121 if I recall correctly. I’m thinking the high idle is an issue from it getting wet but everything I read seems to be more with it stalling than a high idle. Just trying to get the right parts tomorrow.
It does mess with the tps but that code did leave after drying. I read people saying there’s bucks and stall but hers is doing the opposites as the rpm is high plus the oil thing. Since it wasn’t having these problems before I’m led to believe it’s connected Or maybe is just another new problem.
That was me. It does share a ground. Near as I can tell, the difference is in the fact that the TPS is an analog signal (variable voltage) 0-5 volts, while most of the sensors are digital, on or off, and the pcm counts the pulses. The 5 volt signal would be very susceptible to any extra resistance. I don’t fully understand, but i did change my clockspring and it fixed my issues. I had my doubts too, especially since the old clockspring had continuity on every pin and I tried real had to find a break.
I’ll probably tear it apart and see if I can find corrosion on on of the traces or something
Well I unplugged the battery, cleaned the throttle body, and put a new IAC in and the idle appears to be normal now. Not sure if it was unplugging battery to reset the computer or if it was the iac . Found out the IAC that was in it was just a cheap Amazon one by the numbers on it so I didn’t even bother cleaning that, just replaced it, All that matters is everything looks ok now.
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