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79 930
 
MZ3 SBC's Avatar
 
Join Date: Sep 2014
Location: Northern NJ
Posts: 192
Garage
79 930- Unusual vacuum leak ?

Was chasing down an elevated idle on my '79 930. A smoker test immediately showed a worn throttle body shaft as the culprit.

Has anyone else experienced a similar issue ....is this a normal wear item? I can't seem to find much information anyware on rebuilding the throttle body shaft / butterfly ...which leads me to assume this is not usual.

Old 10-27-2016, 07:50 AM
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79 930
 
MZ3 SBC's Avatar
 
Join Date: Sep 2014
Location: Northern NJ
Posts: 192
Garage
Maybe more info would help?

Maybe the throttle body is suppose to leak a little? there is no other vacuum leak as per smoke test - and aux air bypass valve is functioning- took it out, heated it and cooled it. The 12v plug is getting power and is grounded ....then what ?

1) tight linkage- maybe sticking . I tried giving more play...
2) idle speed screw ( doubt it ) - I have it almost all the way it in
3) WUR ? no cold start problem - fires right up 1st crank
4) there is no decel valve or aux air regulator

What happens is - car starts and idles nicely at 950 -1000 right away / first crank.

As I drive it - idle starts to rest higher - once car is hot idle will stay around 1500-1600sometime I pull gas pedal back / pull floor at back and it falls a few hundred but it seems more coincidence than anything else.

Idle is great when car is cold - and is drive able right away

What I am being told -this is how these cars are....

Anybody want to share their experience ?
Old 10-27-2016, 06:11 PM
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