 Testing a four MPS, one holds vacuum but it's erratic |
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| Mark Henry |
 Feb 18 2021, 01:56 PM
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that's what I do!  Group: Members Posts: 20,065 Joined: 27-December 02 From: Port Hope, Ontario Member No.: 26 Region Association: Canada  |
Hi All!
Ethan just tested four MPS on a '74 2.0 we have here and it seems one holds pressure but it runs erratic. We tested the three other MPS and they tested good. I know that even if an MPS tests good, old MPS's the diaphragm's often fail once pressed back into service. Would the Tangerine MPS diaphragm kit help this, or is there something else likely going on? |
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| Mark Henry |
Feb 18 2021, 03:23 PM
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that's what I do! Group: Members Posts: 20,065 Joined: 27-December 02 From: Port Hope, Ontario Member No.: 26 Region Association: Canada |
Thanks Jeff, I see Chris' kit also has a couple of O-rings and a gasket.
I'll dig into it but I'll just order a kit. |
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| DRPHIL914 |
Feb 18 2021, 04:10 PM
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Dr. Phil Group: Members Posts: 5,769 Joined: 9-December 09 From: Bluffton, SC Member No.: 11,106 Region Association: South East States 
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QUOTE(Mark Henry @ Feb 18 2021, 04:23 PM)  Thanks Jeff, I see Chris' kit also has a couple of O-rings and a gasket. I'll dig into it but I'll just order a kit. more than likely its torn, it might just be a small tear, so will run but not well. even hold vac fine . someone recently had this happen, had a couple they opened up, both had diaphragms torn but held vaccuum. I would order 2 kits, rebuild 2 so you have a spare. the paper gasket and the o-rings will make sure you have a good seal once rebuilt with new diaphragm. i have 3 operating MPS right now for my 75 2.o d-jet. One was rebuilt by Jeff B for me and tuned then tested i believe on his car. In comparison to my one that i now have dialed in, that one still runs a bit lean. in fact every one i have ahd in my car or that was tuned to factory spec was too lean and had to be adjusted. but every car is different. Phil |
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Posts in this topic
Mark Henry Testing a four MPS Feb 18 2021, 01:56 PM
JeffBowlsby
Hi All!
Ethan just tested four MPS on a ... Feb 18 2021, 03:11 PM
Mark Henry Thanks Feb 18 2021, 04:22 PM MikeM Mark...I have one that has failed electrically. Th... Feb 19 2021, 11:20 AM Mark Henry Thanks, yes I figured as much.
The one that's... Feb 20 2021, 12:45 PM mgphoto I’ve rebuilt about a half dozen using Racer Chri... Feb 20 2021, 01:46 PM 914_teener I had one that was partially cracked.
Would opera... Feb 20 2021, 10:44 PM warpig Had a similar prob. Rebuilt MPS and would run erra... Feb 21 2021, 12:20 PM
r_towle Order kit (s)
Wait for arrival
Then open MPs Feb 21 2021, 06:25 PM |
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