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  #1  
Old 01-12-2013, 09:48 PM
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Day 2 - 2 questions...

Day two of ownership of my 02 WJ Laredo 4.7 QTII and two things pop up looking for a little advice

1. At cold start (14* F) engine "hunts" 1500-1800 rpm idle, after warm-up it appears to stabilize however at highway speeds (55 mph cruise set) it "hunts again at first I thought it was because I was on a small grade but it did it again on the downhill. It doesn't do it constantly just occasionially. The hunting points to the TPS, can that be intermittent ?

2. Unable to turn key to lock position and remove without messing with the shifter which points to the tbis, which according to the factory service manual (thanks Milous) is a solenoid and cable controlled system. I have found a cable on the web and looked at the drawings but for the life of me I can neither find a solenoid available to purchase or in the drawing. Can someone tell me where it is located so I cam test it at the same time I attempt to adjust the cable...Thanks in advance

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Old 01-12-2013, 10:14 PM
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Re: Day 2 - 2 questions...

I can only help with your first issue, but you are right to think that it is the TPS acting up. I had the exact same 2 issues that you are describing, replaced the TPS and it is as good as new. Also, I would recommened removing the IAC valve and cleaning that as well.
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Old 01-12-2013, 10:42 PM
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Thanks for the input...guess i'll order that one...now to find a SLSA (selector lever sensor assembly) without spending $508 on a shifter or putting in a used part...

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Old 01-13-2013, 04:30 AM
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Re: Day 2 - 2 questions...

Defenitly TPS going out on the first one. Also as Evan mentioned, the idle air control stepper motor plunjer gets very dirty over time and the air canal as well, so that needs some cleaning. This will normally cause erratic idle problems.
The solenoid of the BTSI system is just below/behind the shifter. It will prevent taking the shift lever out of park position without pressing the brake lever. You can see it on the drawing of the shifter assy, its not connected to the BTSI cable and also is not your problem.
Your problem is just the adjustment of the BTSI cable. You seem to have the manual, but the adjustment pages are herby attached.
The 4.7 and 4.0 donīt have the SLSA assy, just a mechanical shifting assy without the fancy sensors of the CRD.
Attached Files
File Type: pdf BTSI.pdf (114.8 KB, 3 views)
File Type: pdf BTSI2.pdf (82.0 KB, 1 views)
File Type: pdf BTSI3.pdf (116.2 KB, 2 views)
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Old 01-13-2013, 09:18 AM
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Thanks Frango ! It was your reply on another post that lead me to looking for a slsa. I was pretty sure it was a cable adjustment (or maybe replacement...but its only $31 for it ) but the shop said there was an ink pen jammed in there which messed up the "sensor" which is why I looked in the manual...for the life of me I couldn't see where the cable connected to a sensor or solenoid. So just so I know what I'm talking about the cable is what prevents the key from removal if the vehicle isn't in park but what prevents the shifter from going into gear unless the brake is depressed...is that a solenoid inside the transmission ?

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Old 01-13-2013, 03:32 PM
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Re: Day 2 - 2 questions...

No, the solenoid is in fact part of the shift lever assy. You can see it on the picture i had send from the shift assy (on the right lower side). When the brake pedal is not depressed, you can't move the knob on top of the shifter to get it out of Park, and its the solenoid who locks it..
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Old 01-13-2013, 03:42 PM
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So if I can push in the button the solenoid is working then ?

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