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Lexus LS Rear Wheel Drive System

16 messages,  Last post on Dec 09, 2009 at 10:53 AM

You are in the Lexus LS 400/LS 430 Forum.

What is this discussion about? Lexus LS 400, Lexus LS 430, Sedan

Messages Page 3 of 3

#15 of 16 Drive train question. by wwest

Nov 17, 2009 (5:26 pm)

'92 LS400 with 155,000 miles. Runs perfect, just passed WA state emissions test with flying colors. driving along at ~40MPH there is a rare "tug" feeling, and sound, as if the brake were applied just for an instant. Cannot readily duplicate. Sometimes "tug....tug...tug" and it seems anything I do, change, (a little less throttle or a little more, etc, etc) and it goes away
 
Car pulls STRONG, transmission seems to be fine, shifting okay, etc. ATF okay.
 
Suspecious of trac system triggering briefly and haven't had a chance yet to run with it turned off. Will also try running with OD off.
 
There is only one U-joint in the drive/line, shaft, anyone had one fail in this manner..?

#16 of 16 Re: Drive train question. [wwest] by wwest

Dec 09, 2009 (10:53 am)

Replying to: wwest (Nov 17, 2009 5:26 pm)
Problem turned out to electrical. The ignition timing sensor wiring from the driver's side engine bank was just barely "touching" the accessory drive belt. Shield braid was worn through as was one of the two sensor wires. Don't now understand why the engine ran at all. Especially don't understand why, as much as I drove the car in the TDCL check mode, no sensor error was recorded.
 
Looks as if the mechanic who replaced the timing belt missed putting the sensor cable back into the restraining clip.
 
Lesson....
 
If it ain't broke don't FIX it....
 
The nice aspect of all this is I inadvertently discovered a way to "fix" the traction control system. The major complaint I have had in the past is how long it takes to "unwind" the dethrottling aspects of the TC system and regain control of the engine RPM.
 
There are two screws that hold the (separate) TC throttle plate in place and I simply backed them out and removed the TC throttle plate. Now when/if teh TC activates the engine will no longer get dethrottled at all.

Messages Page 3 of 3

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