No throttle response, stuck at idle?!? - Defender Source
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  #1  
Old December 30th, 2015, 08:46 PM
doktorno
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Chris deZ.
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No throttle response, stuck at idle?!?

My Father borrowed my '95 NAS to make an hour long drive up to a ski basin. When he arrived at the parking lot (elevation 10,350 and outside air temp of 20) he parked the truck, but was immediately directed to move to a different spot. When he stepped on the accelerator, nothing happened, car was stuck at idle. Checked by pressing the accelerator with his hand, but nothing. As described it did not stumble, nor did it rev, just idled. He rolled it downhill into a different spot and left it.

I showed up in the afternoon and it started up and ran with no issues. Only oddity was the center diff was locked.

The next day I drove it to the same basin. When I returned in the afternoon, it would crank but not start until a few tries. I assume with an OAT in the high teens this was the cold start flooding issue.

No binding on the throttle cable, and all connections appear secure. Likely two separate issues, but from my understanding of 14CUX no throttle/stuck idle seems difficult. Any ideas?
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  #2  
Old December 30th, 2015, 10:25 PM
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Jason England
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Throttle position sensor issue or more likely the simple answer - the throttle cable mechanism stuck. Clean it all up and make sure it moves freely ... you don't want it sticking open. You can test the TPS with a voltmeter.
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  #3  
Old December 31st, 2015, 01:51 AM
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If the cable is not broken or bound up (or was frozen) the throttle body is all gunked up and it was sticking. This is a reasonably common issue on GEMs trucks (wide open throttle is no fun, but rest assured in neutral it will just bounce off the rev limiter), but I have never seen it on a 14CUX. Clean out the throttle body and replace all your PCV lines and clean out the PCV filter thing on top of the valve cover.
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  #4  
Old December 31st, 2015, 02:32 AM
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I don't think it's possible for a vehicle with a throttle to sit at idle when you open the throttle. Like...not physically possible.
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Old December 31st, 2015, 03:14 AM
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Exactly, which is why the throttle body was likely stuck closed by gunk. The cable moved, but the butterfly stuck.
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Old January 1st, 2016, 01:44 AM
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Hehehehehe ...........Your father somehow & for unknown reasons put the T case in N then started the truck, applied throttle and nothing happened! He must have tried a combination of things without success and ended up leaving the T case locked! Theres nothing wrong with your truck!
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Old January 1st, 2016, 08:57 AM
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Chris deZ.
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evilFJ, will check throttle body for obstructions but I cleaned the TB in October. TPS was a thought, I will pull and check the POT. Departing90, yes Sir, I have been unable to replicate...

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Old January 1st, 2016, 10:56 AM
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Quote:
Originally Posted by evilfij View Post
Exactly, which is why the throttle body was likely stuck closed by gunk. The cable moved, but the butterfly stuck.
i dont see how this is possible i could see it getting stuck open
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Old January 1st, 2016, 11:10 AM
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Trevor Griffiths
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Can't see how a mechanical throttle couldn't respond - I'd want to confirm the butterfly operation when the throttle is opened. I would think with a faulty tps, the engine would respond when mechanically opened, a stumble, an intake backfire, something. Is the throttle body heater still in- line? Have access to a scan tool that can give dynamic data, like tps voltage at idle and voltage across the range of throttle motion to wide open throttle?
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Old January 1st, 2016, 09:53 PM
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Quote:
Originally Posted by rover4x4 View Post
i dont see how this is possible i could see it getting stuck open
I have had them stick open, never closed as you say.
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Old January 1st, 2016, 11:23 PM
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Chris deZ.
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Roverlab, I picked up the 14CUX interface cable but have yet to track down a Windows Laptop. Thinking an ECUmate would be a good addition to the vehicle tool box. Will check on the throttle body heater, thought it was connected. In the aviation world we have carb icing, almost wondered if it was the same thing. Agree with the faulty TPS, if the TPS did not send the signal to the ECU the lean mixture would have done something.

Drove the same route today, and all it did this afternoon after a few hours in the cold was flood at startup. Had to pull the injection wire off the coil and crank/wait.
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Old January 2nd, 2016, 08:22 AM
Roverlab
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Trevor Griffiths
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Forgot to say when one is checking the voltage sweep across the TPS, it can be viewed with the key on , engine off! No need to test the rev limiter.....
Additionally, a faulty engine coolant temp sensor could be telling the ECU incorrect data, holding the pulse width open too long.....
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