 Honk Honk!.... " yea, I know I am stalled out and blocking the intersection @$$H*L$" |
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| rhodyguy |
 May 29 2022, 08:35 AM
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#21
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Chimp Sanctuary NW. Check it out.  Group: Members Posts: 22,249 Joined: 2-March 03 From: Orion's Bell. The BELL! Member No.: 378 Region Association: Galt's Gulch  |
This is a MittyvacII. You will know if the diaphragm is spent in short order. Silly question, have you replaced the fuel filter?
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| shredtherad |
May 29 2022, 10:49 AM
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#22
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Member Group: Members Posts: 86 Joined: 17-May 22 From: Longmont, Colorado Member No.: 26,559 Region Association: Rocky Mountains |
QUOTE(rhodyguy @ May 29 2022, 08:35 AM)  This is a MittyvacII. You will know if the diaphragm is spent in short order. Silly question, have you replaced the fuel filter? I just did the vacuum test on MPS and I could not get the pressure above 10 and immediately would drop down. So, if this not the issue, it is ONE of the issues. |
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| shredtherad |
May 29 2022, 10:54 AM
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#23
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Member Group: Members Posts: 86 Joined: 17-May 22 From: Longmont, Colorado Member No.: 26,559 Region Association: Rocky Mountains |
All, thanks for the replies and insights
I tested the map sensor with a handheld vacuum test and it failed. Recored the test. Vacuum Test |
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| brant |
May 29 2022, 12:40 PM
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#24
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914 Wizard Group: Members Posts: 12,020 Joined: 30-December 02 From: Colorado Member No.: 47 Region Association: Rocky Mountains 
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So that creates an ultra rich condition and the reason the car would flood out at idle
Should be rich all the time |
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| brant |
May 30 2022, 09:04 AM
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#25
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914 Wizard Group: Members Posts: 12,020 Joined: 30-December 02 From: Colorado Member No.: 47 Region Association: Rocky Mountains
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There is also an O’ring inside to seal the MPS case hallves
I’ve seen the oring crack also. But most likely it is the diaphragm It can take a couple of hours to disassemble with a heat gun while getting the epoxy from the threads Don’t force it As it’s easy to damage the aluminum plug adjustment threads Requires a discontinued wave tech meter or an AFR to readjust the mixture upon reassembling Takes a lot of time to get it right But on the plus side. It can be adjusted for todays fuel and more accurate than a stock one adjusted for the fuel available 50 years ago |
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| shredtherad |
May 30 2022, 05:45 PM
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#26
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Member Group: Members Posts: 86 Joined: 17-May 22 From: Longmont, Colorado Member No.: 26,559 Region Association: Rocky Mountains |
QUOTE(brant @ May 30 2022, 09:04 AM) There is also an O’ring inside to seal the MPS case hallves I’ve seen the oring crack also. But most likely it is the diaphragm It can take a couple of hours to disassemble with a heat gun while getting the epoxy from the threads Don’t force it As it’s easy to damage the aluminum plug adjustment threads Requires a discontinued wave tech meter or an AFR to readjust the mixture upon reassembling Takes a lot of time to get it right But on the plus side. It can be adjusted for todays fuel and more accurate than a stock one adjusted for the fuel available 50 years ago The previous owner of the car had an extra MPS unit and reached out after he saw my post on here. I drove down and grabbed it today! it holds pressure and I think the car is good now, no stalling (yet). If anything it is lean now, idle is really low and the acceleration has dropped off just a tinge. Rad community! so cool. Thanks. |
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