Stepper Motor Cleaning - More Details Please - Defender Source
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  #1  
Old November 2nd, 2011, 11:17 PM
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Stepper Motor Cleaning - More Details Please

Plenty of great threads pointing to the simple task of "clean your stepper motor" as a step to troubleshoot idle issues.

I just pulled mine and cleaned it, however, I have a few more detailed questions I can't find the answers too...

1. Cleaning the stepper motor itself seems an obvious procedure, .. and the faces where the plenum/stepper meet the gasket, but what about the hole it came out of? How far in there should you clean, and what's the best thing to clean the hole with? carb cleaner?

2. How 'dirty' is a dirty stepper motor? Mine had minor black film over the pointy bit at the end, but wasn't especially filthy. I'm kind of looking for an assessment of "oh yeah that gunky mess for sure is the idle-issue culprit", vs . "huh, looks pretty clean/normal, onto the next thing..".

appreciate the pointers o-wise-ones.
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  #2  
Old November 3rd, 2011, 05:08 AM
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Did it fix your problem?

No matter how much I have cleaned the stepper motor the housing or the throttle body any time I have pulled the plenum there has been some "gunk" to clean.
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  #3  
Old November 3rd, 2011, 08:22 AM
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Bill Adams
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They're cheap enuf that it's better to just get a new one if yours is in doubt. However a light coat of carbon does not seem to be excessive crud. Untold gazillions of GM cars and trucks use this exact part.
The stepper motor is an adjustable air bypass device that opens and closes the hole by means of a screw driven plunger (the pointy thing). The ECU operates the "motor" that spins the screw drive mechanism depending on how much bypass air is needed. Usually on deceleration, the bypass airway opens to keep the engine from bogging and stalling.
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  #4  
Old November 3rd, 2011, 12:15 PM
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Quote:
Originally Posted by rover4x4 View Post
Did it fix your problem?
not sure.. its happening pretty sporadicly, so too early to tell. this is fleabus's old truck, and idle issues are not new to it (http://www.defendersource.com/forum/...ead.php?t=7057)... but they're re-surfacing after a multi-year vacation.
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Old November 3rd, 2011, 04:00 PM
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I am not up to speed on the GEM's trucks but it seems there is very little to go wrong other than 8 coil packs wires and plugs.


Background is nice, mileage whats been replaced how well has it been maintained? I generally throw parts at problems due to my lack of trouble shooting skill this generally solves my issues. Id say if its not throwing codes has good plugs and wires run some techron through it and flog it.
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Old November 3rd, 2011, 06:48 PM
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Chris Davis
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Keep in mind that vaccum leak problems are often to blame. These can be actual gasket leaks or hose leaks. Choke spray in the engine bay around all probable areas are the first thing I try... If the engine RPM goes up, you got a leak.
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  #7  
Old November 4th, 2011, 12:39 PM
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Thanks for the suggestions guys - I'll spin up another thread with all the maintenance history etc, maybe it will jog some thoughts... there's some ECU history worth mentioning. I'll try not to hijack this thread and keep it on-top of what to look for when cleaning the stepper.

Sadly, stepper cleaning didn't fix me, she stalled again yesterday.
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  #8  
Old November 12th, 2011, 01:37 AM
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quick update: i replaced the stepper with Napa/Echlin part. so far so good... 3 days stall-free...
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  #9  
Old November 12th, 2011, 02:03 AM
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brett...what napa part number. Need to pick one up for my 97 as well.
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  #10  
Old November 12th, 2011, 11:38 AM
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Quote:
Originally Posted by Roverdoc View Post
brett...what napa part number. Need to pick one up for my 97 as well.
Product Number: CRB 21856
Price: $68.33
http://www.napaonline.com/Catalog/Ca...856_0213481115
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  #11  
Old November 12th, 2011, 11:48 AM
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Dan Kemper
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thanks.
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  #12  
Old April 26th, 2012, 10:20 AM
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Troy Norton
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does this part come with a replacement gasket? I need to pull mine out and clean it first to see if that clears the code but I read in workshop manual about replacing the gasket when re-installing. Anyone know about this?
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Old April 26th, 2012, 10:53 AM
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Nick Vogel
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I have cleaned mine out once in 3 years. I always use throttle boddy cleaner and some clean rags. I didnt replace the gasket, but I did notice that the vaccum line going from the throttle boddy looked bad. When I grabbed it to pull it off, it fell apart. No more stalling since.
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  #14  
Old April 26th, 2012, 11:10 PM
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This is where I got mine. Works like a charm.

http://www.amazon.com/gp/product/B00...ls_o03_s00_i00
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