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Vacuum pump issues

ezgn

Well-known member
Steel Soldiers Supporter
650
1,039
93
Location
Lake Elsinore Ca.
I checked the vacuum on the pump at the 3/8" fitting and it holds at a steady 26. At the small line going from the pump to the vacuum switch it flucuates rapidly from 18-14. Coming out of the vacuum modulator to the tranny is a steady 11. The truck is a 1986 M1008 shifts at 15 and 35. Any help would be appreciated. The lines are all new and tight.
 

Russm

Active member
244
69
28
Location
Ft. Wainwright, AK
From your description I don't see any issues. I've adjusted mine to also shift at 15 and 35.
Are the shifts rough or causing concern somehow?

Sent from my LM-G710 using Tapatalk
 

ezgn

Well-known member
Steel Soldiers Supporter
650
1,039
93
Location
Lake Elsinore Ca.
From your description I don't see any issues. I've adjusted mine to also shift at 15 and 35.
Are the shifts rough or causing concern somehow?

Sent from my LM-G710 using Tapatalk
My concern is that it fluctuates rapidly between 18 and 14 and I was wanting to know if this was normal or a symptom of the vacuum pod getting weak. Thanks
 

cucvrus

Well-known member
11,272
9,589
113
Location
Jonestown Pennsylvania
I agree with the previous poster. If it shifts fine and you have no negative problems keep on going. What is the concern? It will fluctuate it is on a distributor drive with a diaphragm. Finding new ones is getting hard. Are you having issues? If you dig deep enough you will find more problems. But if it were mine and everything was shifting fine I would drive on. That vacuum system works fairly easy. I usually get a local transmission shop to set mine up if I have issues with the shift and not shift. Works out better for me and is $20-$40. well spent. Good Luck.
 

ezgn

Well-known member
Steel Soldiers Supporter
650
1,039
93
Location
Lake Elsinore Ca.
I agree with the previous poster. If it shifts fine and you have no negative problems keep on going. What is the concern? It will fluctuate it is on a distributor drive with a diaphragm. Finding new ones is getting hard. Are you having issues? If you dig deep enough you will find more problems. But if it were mine and everything was shifting fine I would drive on. That vacuum system works fairly easy. I usually get a local transmission shop to set mine up if I have issues with the shift and not shift. Works out better for me and is $20-$40. wel
 

ezgn

Well-known member
Steel Soldiers Supporter
650
1,039
93
Location
Lake Elsinore Ca.
Thanks for the help. I didn't know that the vacuum pump readings fluctuates. I feel some relief. I know the pumps are getting scarce so I thought I should grab one for insurance.
 
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