 Distributors and Trigger Points (New Dizzy Installed), Troubleshooting Parts - CHT appears bad |
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| emerygt350 |
 Sep 28 2021, 05:41 AM
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#41
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Advanced Member  Group: Members Posts: 2,087 Joined: 20-July 21 From: Upstate, NY Member No.: 25,740 Region Association: North East States  |
All great suggestions, and I would start with the compression.
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| tvdinnerbythepool |
Sep 28 2021, 09:26 AM
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#42
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Member Group: Members Posts: 310 Joined: 24-July 18 From: Olympia, WA Member No.: 22,336 Region Association: Pacific Northwest 
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Thanks all.
I've made a list with the above and will get to work! Gluten for punishment I guess (IMG:style_emoticons/default/piratenanner.gif) |
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| tvdinnerbythepool |
Sep 29 2021, 11:31 AM
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#43
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Member Group: Members Posts: 310 Joined: 24-July 18 From: Olympia, WA Member No.: 22,336 Region Association: Pacific Northwest
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CHT cold (63 degrees F) 49.5K ohms
Well...there's your problem! (At least part of it right?) Running part 012 from 914Rubber. According to PBanders I should be at 2.85K ohms at 61F. Previously tested good but now it doesn't. Still testing the rest of the above items. Thoughts? Attached thumbnail(s) 
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| tvdinnerbythepool |
Sep 29 2021, 11:56 AM
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#44
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Member Group: Members Posts: 310 Joined: 24-July 18 From: Olympia, WA Member No.: 22,336 Region Association: Pacific Northwest
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What are peoples experiences between the URO (part 041) vs the 914rubber (part 012)?
I'm always the first to support Mark and the guys over at 914...maybe I just got an intermittent sensor which I've heard is not unusual. |
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| emerygt350 |
Sep 29 2021, 01:15 PM
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#45
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Advanced Member Group: Members Posts: 2,087 Joined: 20-July 21 From: Upstate, NY Member No.: 25,740 Region Association: North East States |
I would start with that blow by (compression test).... I know it can be scary but if you have big mechanical issues going on your CHT isn't really going to matter...
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| tvdinnerbythepool |
Sep 30 2021, 03:00 PM
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#46
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Member Group: Members Posts: 310 Joined: 24-July 18 From: Olympia, WA Member No.: 22,336 Region Association: Pacific Northwest
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Update below
CHT: measured 49.7K Ohms at 63 degrees (OUT OF SPEC - NEW ONE IN THE MAIL) MPS: -Vacuum holds all day long at 15" -Calibrated with Wavetech to PBanders specs, very close specs to another sealed unit I have to compare to. TPS: Tested perfectly, Mild wear on the Board but not needing replacement. Cleaned and re-calibrated. Compression test: These are cold numbers, will repeat when new CHT installed with some hot numbers. #1: 145psi #2: 150psi #3: 155psi #4: 155psi Pleasantly surprised by those numbers, all within 10psi so whatever wear exists is nice and even. Will install new CHT hopefully tomorrow night if it gets here in time. Still need to check the intake plenum and possibly bypass the CSV. I am not convinced it's a vacuum issue as I have very low idle issues, not high, but will inspect. Really looking like the CHT is the culprit or the ECU. And now I have the infamous modified 13mm deep socket, Lol |
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| emerygt350 |
Oct 1 2021, 07:44 AM
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#47
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Advanced Member Group: Members Posts: 2,087 Joined: 20-July 21 From: Upstate, NY Member No.: 25,740 Region Association: North East States |
The engine is designed with particular vacuum leaks expected, like the pcv.
Does your idle screw do anything at all? |
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| DRPHIL914 |
Oct 1 2021, 11:10 AM
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#48
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Dr. Phil Group: Members Posts: 5,766 Joined: 9-December 09 From: Bluffton, SC Member No.: 11,106 Region Association: South East States
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QUOTE(tvdinnerbythepool @ Sep 30 2021, 05:00 PM)  Update below CHT: measured 49.7K Ohms at 63 degrees (OUT OF SPEC - NEW ONE IN THE MAIL) MPS: -Vacuum holds all day long at 15" -Calibrated with Wavetech to PBanders specs, very close specs to another sealed unit I have to compare to. TPS: Tested perfectly, Mild wear on the Board but not needing replacement. Cleaned and re-calibrated. Compression test: These are cold numbers, will repeat when new CHT installed with some hot numbers. #1: 145psi #2: 150psi #3: 155psi #4: 155psi Pleasantly surprised by those numbers, all within 10psi so whatever wear exists is nice and even. Will install new CHT hopefully tomorrow night if it gets here in time. Still need to check the intake plenum and possibly bypass the CSV. I am not convinced it's a vacuum issue as I have very low idle issues, not high, but will inspect. Really looking like the CHT is the culprit or the ECU. And now I have the infamous modified 13mm deep socket, Lol i have the d-jet as well but '75 so they are set up just a bit different, sounds like once you hvae a good CHT( i have 3 on hand just in case) you will get it going, but, did you try to get new set of trigger points plate for the FI triggers? they are out there, i have several but will not part with them as i keep them for my OEM distributor for back up in case of 123 failure and for originality etc . Anyway i have run the 123 for 3 years and it is doing fine, i dont have vac advance so running Curve D for no vac advance for a '75. set your timing, follow instructions, verify proper function of CHT and MPS before you throw the 123 aside., Keep your OEM one, get a set of fi tp plate contacts and get Norburt's calibration tool for the FI triggers. |
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| tvdinnerbythepool |
Oct 1 2021, 12:28 PM
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#49
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Member Group: Members Posts: 310 Joined: 24-July 18 From: Olympia, WA Member No.: 22,336 Region Association: Pacific Northwest
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@emerygt350 idle screw does work and is very effective in adjusting idle speed
@drphil914 I am running the analog 123 distributor for now. I will keep the OEM, source some trigger points etc but hope the 123 will be the way to go. Waiting on a new CHT from 914 and will also get a URO as a spare. Hope this thing is up and running soon. I will troubleshoot the CSV if I still have issues with the suggestion of it possibly leaking and also will suspect the ECU. People say they don't go bad but the one that came in this car was shot. Probably the $30 sensor though! Thanks for all the help guys. |
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| emerygt350 |
Oct 1 2021, 03:44 PM
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#50
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Advanced Member Group: Members Posts: 2,087 Joined: 20-July 21 From: Upstate, NY Member No.: 25,740 Region Association: North East States |
If the idle screw works can you bring the idle up with it or is it unstable (seems fine but when you drive it it drops low again)?
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| tvdinnerbythepool |
Oct 1 2021, 09:00 PM
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#51
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Member Group: Members Posts: 310 Joined: 24-July 18 From: Olympia, WA Member No.: 22,336 Region Association: Pacific Northwest
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QUOTE(emerygt350 @ Oct 1 2021, 02:44 PM) If the idle screw works can you bring the idle up with it or is it unstable (seems fine but when you drive it it drops low again)? Correct, I would adjust the idle screw out to raise the idle but didn't solve the inconsistency of sometimes having correct idle and a few minutes later too low idle. It never was "too high"... Parts are taking their time in the mail so hopefully Monday I can see where i'm at. |
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