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TPS and IAC on Ranger

 
Old 01-04-2019, 07:14 AM
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Default TPS and IAC on Ranger

Need some knowledge here, '04 Ranger, 3.0, 5 speed manual.
Took off yesterday, drove a few miles until the engine warmed up, slowed down for a stopsign. Shoved the clutch in, and engine wound up to around 2500 rpm. It would intermittently do this for the next 30 miles. It finally threw a P1120 code, TPS out of range. By the time I got home and shoved the clutch in again, it revved to 3800 rpm. I ordered a new TPS. If the IdleAirController, IAC, was to stick open, I can see that causing this problem, but would it also cause me to see the P1120 DTC?
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Old 01-04-2019, 07:20 AM
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Originally Posted by johnday View Post
Need some knowledge here, '04 Ranger, 3.0, 5 speed manual.
Took off yesterday, drove a few miles until the engine warmed up, slowed down for a stopsign. Shoved the clutch in, and engine wound up to around 2500 rpm. It would intermittently do this for the next 30 miles. It finally threw a P1120 code, TPS out of range. By the time I got home and shoved the clutch in again, it revved to 3800 rpm. I ordered a new TPS. If the IdleAirController, IAC, was to stick open, I can see that causing this problem, but would it also cause me to see the P1120 DTC?
what happens when you turn the a/c on? does the idle tank and almost stall?
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Old 01-04-2019, 07:23 AM
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Never thought of that, I think I see where you going. I'll give that a shot this morning to see what happens. Thanks DJ.
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Old 01-04-2019, 10:15 AM
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OK, went for a short drive and got things warmed up. It was still running up close to 2K, but idled down to 750 slowly. I tried switching on the AC, and idle stayed at 750, no slowing down and almost stalling. Ran it thru all heat/cool settings, no change. I think you were gonna say blend door actuator?
I'm gonna pull the TPS off just to see if there's any rough spots, and also check the throttle body to see if it's loose. Might even squirt some cleaner in the IAC, then some Fluid Film, just in case it may be sticking.
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Old 01-04-2019, 10:23 AM
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With the engine at idle disconnect the IAC, the engine should die out. If not there could be a vacuum leak. I'd want to look at PID's before changing any parts. How many miles on the beast?
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Old 01-04-2019, 10:53 AM
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Originally Posted by Rnlcomp View Post
With the engine at idle disconnect the IAC, the engine should die out. If not there could be a vacuum leak. I'd want to look at PID's before changing any parts. How many miles on the beast?
.
I've got just under 170k on it. I'll pull that connector off and see what it does before I try clean/lube.
All I have is a codereader on my UltraGauge.
Thanks Robert!
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Old 01-04-2019, 03:32 PM
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Pulled the pigtail on the IAC, idle dropped down to 500 from 750.
I think I found the trouble, about 95% sure it's the TPS. I took it off, and the guts were discolored, and could hardly turn the the pot. I could also see where the plastic slot appeared worn, and seems like the shaft from the TB may have been binding on it and staying open further than it should. I've got one that should be here tomorrow in the mail, they say.
Hope that's it, easy fix.
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Old 01-04-2019, 04:44 PM
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You can prove that theory by removing the TPS but leave it plugged in, fire it up then unplug the IAC. The truck should die out. Wouldn't be the first time I've seen a binding TPS.
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Old 01-04-2019, 04:58 PM
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Thanks Robert, I'll do that 1st thing in the morning.
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Old 01-04-2019, 06:04 PM
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Hey guys, is there anything I have to reset like idle, KAM, or anything once I stick that new TPS in?
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