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| Ron914 |
May 8 2025, 05:06 PM
Post
#1
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Member ![]() ![]() Group: Members Posts: 442 Joined: 19-April 22 From: Huntington Beach,Ca Member No.: 26,487 Region Association: Southern California
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Hello to all who have helped me with this project . @emerygt350 ,@TJB/914, @Superhawk996 , @ChrisFoley , @rjames , @MDTerp
I am in the middle of rebuilding my MPS and have a couple of comments and questions . First when I opened up the unit I found the most difficult job was removing the rivets holding the two halves together. When I removed the retainer plate to take out the old diaphragm it was in two pieces . I needed to take two measurements since I was replacing the stop screw , I needed to measure the the stop screw protrusion into the housing . The instruction sheet sent to me by a member had the measurements he must have made when rebuilding his MPS . His stop screw protrusion was 1.97mm and mine only measured 1.72mm. His inner/outer screw assembly depth in the old diaphragm measured 6.51mm . Here's one of my questions ? when I measured mine I got two measurements depth to inner/outer screw assembly was 4.03 and depth to the washer outside the inner/outer screw assembly was 5.46mm. Again there is a difference and since mine was never accessed before (epoxy over screw was not disturbed) is the difference in measurements ok and which measurement should I use I will try to attach a photo or two to help with my question. this one . I have not touched either of these measurements yet and awaiting any help/comments. I think it's this one to the washer on diaphragm . |
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| Ron914 |
Sep 8 2025, 12:05 PM
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#2
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Member ![]() ![]() Group: Members Posts: 442 Joined: 19-April 22 From: Huntington Beach,Ca Member No.: 26,487 Region Association: Southern California
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Getting back to my D-Jet issue , walking away is what I do when things get a bit frustrating , coming up with another plan .
Well I purchased this test device for D-Jet from a member here . Although I have tested with my DVM these connections /values it really made it easier to take the readings . I noticed when I checked my fuel pressure after 5 minutes I had a loss of 2 psi , not sure if this indicates a leak somewhere but I do still have a gassy smell inside my car . I have replaced the old plastic lines with SS ones and all fuel hose has been replaced with Cohline braided hose from the bird . The fuel tank was also removed and checked but I did not do a pressure test on it , the gasket inside the fuel cap was also replaced .( this is a separate issue and doubt it is the reason for my engine cutting out at 212F) . I also figured out why my Dakota digital was reading so low ( it was in Celsius mode ) so when I said the motor quits running at 100 that really is 212F . I had to call their customer service and have them send out a new plug as one of the sensor leads has come out of the factory plug .I have videos of motor start up and bad running but I don't think I will use YouTube to post as this makes all videos public . My coil seemed hot but I figured this was probably due to leaving my ignition on too long during voltage checks .I currently have the decel valve disconnected and bypassed , vacuum line disconnected from distributor . I can send a email or text the video to @Superhawk996 or @emerygt350 if you would like. My test results |
Ron914 MPS May 8 2025, 05:06 PM
Superhawk996 There you have it, now you know why it was a leake... May 8 2025, 06:36 PM
Ron914
There you have it, now you know why it was a leak... May 8 2025, 06:58 PM
MDTerp
There you have it, now you know why it was a leak... May 8 2025, 08:17 PM
Ron914 Well all done . I must say it was easier than I th... May 8 2025, 08:30 PM
JeffBowlsby Another documented case of a completely fractured ... May 8 2025, 10:15 PM
emerygt350 Way to go. I mean you are disassembling the most ... May 9 2025, 06:57 AM
rjames Crazy that it could hold vacuum at all! May 9 2025, 10:01 AM
Superhawk996
Crazy that it could hold vacuum at all!
Mine... May 9 2025, 01:24 PM
Ron914 Well I was optimistic that my car was going to run... May 9 2025, 05:37 PM
emerygt350 You can pull the wires one at a time till you find... May 9 2025, 06:09 PM
Superhawk996 This is going to be a tough love post.
When you ... May 9 2025, 07:26 PM
Ron914
This is going to be a tough love post.
When you... May 12 2025, 03:17 PM
Superhawk996 I’m going to post this over here
This is anoth... May 9 2025, 07:53 PM
rjames What Hawk said.
And you just rebuilt your MPS, so... May 9 2025, 08:17 PM
Ron914 Thank you Superhawk and emery ,You are correct in... May 9 2025, 08:27 PM
emerygt350 Once it is all back together, remember that inner ... May 10 2025, 04:22 AM
emerygt350 Don't worry about TDC, the distributor only go... May 12 2025, 05:50 PM
Ron914
Don't worry about TDC, the distributor only g... May 12 2025, 06:57 PM
fiacra
If only I didn't live in California I would b... May 12 2025, 08:03 PM
Ron914
If only I didn't live in California I would ... May 12 2025, 09:46 PM
Superhawk996 First on the to do list
MPS is leaking down too ... May 12 2025, 06:57 PM
Ron914
First on the to do list
MPS is leaking down too... May 12 2025, 09:44 PM
Superhawk996 Aren’t other guys in CA running 123’s?
Regard... May 12 2025, 07:00 PM
Superhawk996 Also with respect to the dizzy vs timing
Yes - s... May 12 2025, 07:19 PM
Ron914 As far as putting a 123 in my California car I was... May 12 2025, 09:11 PM
Superhawk996 I would open the MPS back up. I can post time lap... May 13 2025, 08:37 AM
Ron914
I would open the MPS back up. I can post time la... May 13 2025, 10:19 AM
emerygt350 I agree with hawk. The first time I rebuilt mine ... May 13 2025, 10:02 AM
fiacra Ron got that Pertronix from me, and yes it is olde... May 13 2025, 01:34 PM
Ron914
Ron got that Pertronix from me, and yes it is old... May 13 2025, 03:25 PM
fiacra
If I was to eventually pass a smog test I could t... May 13 2025, 07:00 PM
Superhawk996 Remote stater switch is about $15 and pricele... May 13 2025, 01:35 PM
Superhawk996 Z0n2aTFRMiI?si=W8rg02X2Kwp4r_54
I cut this off at... May 13 2025, 02:40 PM
rjames There is an art (and likely some luck) in getting ... May 13 2025, 03:00 PM
Ron914
There is an art (and likely some luck) in getting... May 13 2025, 03:10 PM
SVG223 Good luck with this, my MPS is leaking too, watchi... May 13 2025, 04:18 PM
Ron914 [quote name='SVG223' post='3205335... May 13 2025, 09:01 PM
JeffBowlsby Just a heads up, there are other places the MPS ca... May 13 2025, 06:18 PM
JeffBowlsby dbl dbl. May 13 2025, 06:18 PM
Ron914 Well I opened my MPS and found that the order in w... May 14 2025, 07:57 AM
ChrisFoley I switched from a round o-ring to square in my kit... May 14 2025, 10:45 AM
Ron914
I switched from a round o-ring to square in my ki... May 14 2025, 12:07 PM
emerygt350 I think that is exactly what I did the first time ... May 14 2025, 11:54 AM
Ron914
I think that is exactly what I did the first time... May 14 2025, 12:08 PM
Ron914
I think that is exactly what I did the first time... May 14 2025, 04:36 PM
emerygt350
I think that is exactly what I did the first tim... May 14 2025, 04:48 PM
emerygt350 Although no leak is best. That leak is pretty slow... May 14 2025, 12:29 PM
Superhawk996 Get rid of the adapters
Go straight from vacuum ... May 14 2025, 01:41 PM
Ron914
Get rid of the adapters
Go straight from vacuum... May 14 2025, 04:32 PM
Superhawk996
[quote name='Superhawk996' post='3205480' date='M... May 14 2025, 05:58 PM
rjames
[quote name='Superhawk996' post='3205480' date='... May 14 2025, 06:20 PM
Ron914
[quote name='Superhawk996' post='3205480' date='... May 15 2025, 12:29 PM
SVG223 Mine takes 45 seconds to leak from 10 in/hg to 5 i... May 14 2025, 03:12 PM
emerygt350
Mine takes 45 seconds to leak from 10 in/hg to 5 ... May 14 2025, 04:18 PM
ChrisFoley Problem with the old square o-ring is that it will... May 15 2025, 08:57 AM
Ron914
Problem with the old square o-ring is that it wil... May 18 2025, 01:41 PM
Superhawk996 :trophy: you’re getting there! May 18 2025, 02:17 PM
rjames No need to crack it open again to adjust if you ha... May 18 2025, 03:12 PM
Ron914 Well after putting the old square O ring back in ... May 24 2025, 08:40 AM
rjames Put the ecu knob back in the middle and adjust onl... May 24 2025, 09:16 AM
Ron914
Put the ecu knob back in the middle and adjust on... May 24 2025, 10:27 AM
rjames
Put the ecu knob back in the middle and adjust o... May 27 2025, 06:30 PM
Superhawk996
I need to add that I must set my timing still , ... May 28 2025, 05:36 AM
Ron914
I need to add that I must set my timing still ,... May 29 2025, 06:25 PM
JeffBowlsby Of those three pairs of wires, one is grounds for ... May 24 2025, 10:49 AM
Ron914
Of those three pairs of wires, 1 iz grounds did t... May 24 2025, 11:09 AM
Superhawk996 Those grounds are mighty crispy and corroded and a... May 28 2025, 05:31 AM
Superhawk996 My bad Ron
I completely forgot you were running P... May 30 2025, 04:15 AM
Ron914 Hello to all that have been helping me getting my ... Aug 19 2025, 03:10 PM
Superhawk996 Hi Ron,
Glad you haven’t given up.
Two thi... Aug 19 2025, 04:35 PM
Superhawk996 Here’s a little experiment you can do before the... Aug 19 2025, 04:46 PM
Ron914 I will try your suggestions later today and post t... Aug 19 2025, 05:03 PM
emerygt350
I will try your suggestions later today and post ... Aug 19 2025, 05:20 PM

Ron914
I will try your suggestions later today and post... Aug 19 2025, 05:30 PM
Superhawk996
I will try your suggestions later today and post ... Aug 19 2025, 07:50 PM
Ron914 @Superhawk996 I made the checks you requested and... Aug 19 2025, 10:39 PM
ctc911ctc Audio engineers Fluke!
[b]@[url=http://www.... Aug 20 2025, 09:52 AM
Superhawk996 Good job and report out on the testing Ron. :head... Aug 19 2025, 11:33 PM
Ron914
Good job and report out on the testing Ron. :hea... Aug 20 2025, 08:12 AM
Ron914 I made the tool needed to remove my CHT and I noti... Aug 25 2025, 12:30 PM
Ron914 I decided to verify the condition of the CHT wire ... Aug 25 2025, 12:46 PM
Superhawk996 Flukes rarely go bad
New leads are much cheaper ... Aug 25 2025, 12:59 PM
ctc911ctc
Flukes rarely go bad
^^^^^^^^^^^^^^^^
:agree:... Aug 25 2025, 01:27 PM
Ron914 Yes the car is still stalling after 5-10 minutes o... Aug 25 2025, 01:44 PM
Superhawk996
Yes the car is still stalling after 5-10 minutes ... Aug 25 2025, 03:54 PM
Ron914
Yes the car is still stalling after 5-10 minutes... Aug 25 2025, 05:39 PM
emerygt350 Your not at a higher altitude are you?
16 isnt en... Aug 25 2025, 02:04 PM
Ron914
Your not at a higher altitude are you?
16 isnt e... Aug 25 2025, 02:32 PM
emerygt350 At the least you can resell it. Just remember, th... Aug 25 2025, 03:22 PM
cgnj I'm curious where these diaphragms are being s... Aug 25 2025, 03:29 PM
emerygt350 Go for it! I love a carb too but this is like ... Aug 25 2025, 03:44 PM
Superhawk996 Ah - OK so you have a good wire from sensor to ECU... Aug 25 2025, 07:03 PM
emerygt350 I always do a visual before hand as well. Mps vac... Aug 26 2025, 05:37 AM
Puebloswatcop Where can I obtain a MPS re-build kit with a new d... Aug 26 2025, 06:46 AM
FlacaProductions Unless someone is going to sell you from their sta... Aug 26 2025, 07:17 AM
rjames I'm confused (happens often).
On August 19th y... Sep 8 2025, 12:38 PM
Ron914
I'm confused (happens often).
On August 19th ... Sep 8 2025, 03:00 PM
emerygt350 A 2 psi drop would lean the mix quite a bit.
That... Sep 8 2025, 02:21 PM![]() ![]() |
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