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Old 01-07-2021, 12:07 AM   #1
RobertGary1
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1996 SC2
2006 VUE 3.5L
Default Leak at tb axle

I was bored and decided to play around with my smoke machine. Pushing smoke through the pvc hose and plugging the tb intake I got some smoke from the case via blowby I suppose and a fair amount around the tb axle at the spring. Wasn’t expecting that. Don’t seem to have any drivability issues but was surprised.

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Old 01-07-2021, 02:34 PM   #2
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Default Re: Leak at tb axle

Fortunately, this is an SD (speed-density) EFI, slight vacuum leaks don't matter at all; no MAF sensor to be being "cheated".
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Old 01-08-2021, 09:21 AM   #3
Highmile
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Default Re: Leak at tb axle

The only time the TB shaft is an issue is when it becomes so worn the throttle plate doesn't close consistently.

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Old 01-10-2021, 01:44 PM   #4
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Default Re: Leak at tb axle

Quote:
Originally Posted by Highmile View Post
The only time the TB shaft is an issue is when it becomes so worn the throttle plate doesn't close consistently.

Highmile
'95 SL1 722k and counting
Spray some chain lube and the vacuum will suck it past the ball bearing and flush out some of the road grit, extending the life of the bearing.
...
Competition Clutch 10Lb. Flywheel. 14 stalls to date (and loving it).
Oil use is 1 ounce per 100 miles with ~230,000 miles on the engine
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Old 01-17-2021, 02:52 AM   #5
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Default Re: Leak at tb axle

Good thinking, Bumpdraft !
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Old 01-17-2021, 03:17 PM   #6
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Default Re: Leak at tb axle

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Good thinking, Bumpdraft !
Your welcome
I was thinking...be careful the lube does not contain anything that would harm the oxygen sensor.
I was over-thinking...the TB butterfly return spring is strong. As a sort of an air filter, you might be able to wrap some oiled, thin felt cloth around the outside of the spring and staple the felt to itself. It would be best to remove the TB to wrap the felt and to verify that nothing dangerous would happen. Be careful.
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Oil use is 1 ounce per 100 miles with ~230,000 miles on the engine
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Old 01-25-2021, 10:51 AM   #7
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Default Re: Leak at tb axle

Quote:
Originally Posted by bumpdraft View Post
Spray some chain lube and the vacuum will suck it past the ball bearing and flush out some of the road grit, extending the life of the bearing.
The number of miles it took mine to wear out is well beyond what most will every see. Simply replaced with a low mile used unit. I want to say that it was well into the 500,000 mile range but my memory isn't as good as it used to be.

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Old 01-25-2021, 11:22 AM   #8
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Default Re: Leak at tb axle

> Simply replaced with a low mile used unit.

In previous relevant discussion, OldNuc made same suggestion.
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