 D-Jet Conversion not going as planned., Car starts but will not run. |
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| slapshot |
 Oct 18 2024, 03:08 PM
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Member  Group: Members Posts: 109 Joined: 11-June 23 From: Utah Member No.: 27,409 Region Association: Rocky Mountains 
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I am converting back to D-Jet and my car will start but dies right after. It will not rev up applying throttle. I have a 1975 914 2.0. It was running great with Weber 40s prior.
The D-Jet system is from a 1974 2.0. All the parts came in visibly good condition. TPS calibrates good, AAV tested good, Thermo sensor good, air intake temp sensor good, and a new cylinder head temp sensor. The only test that I think is failing is the vacuum test on the MPS. It leaks. Video of testing the MPS.. The MPS has also been rebuilt at some point. The original part # has been removed. There's a good chance it is not calibrated for my car. I have all new vacuum hose and fuel pressure is between 28 and 30. I don't have any tools to calibrate the MPS. Should I try turning the inner screw on the MPS to see if it helps? Or should I send it to someone to have it rebuild again and recalibrated? If the later do you have any recommendations on who to send it to? |
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| fiacra |
Oct 18 2024, 03:54 PM
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#2
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Person.Woman.Man.Camera.TV Group: Members Posts: 444 Joined: 1-March 19 From: East Bay Region - California Member No.: 22,920 Region Association: Northern California
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Not the person to ask about how to calibrate your MPS, but if you are looking to have it rebuilt, or to buy a rebuilt MPS:
Jeff Bowlsby: https://bowlsby.net/914/WiringHarnesses/#Miscellaneous Auto Atlanta: http://www.autoatlanta.com/Porsche-Rebuilt...B039906051.html Tangerine Racing sells a repair/calibration kit, but the website shows the diaphragm as being out of stock right now. There are probably other vendors, but that's what comes to mind right now. Good luck! |
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| slapshot |
Oct 18 2024, 04:41 PM
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#3
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Member Group: Members Posts: 109 Joined: 11-June 23 From: Utah Member No.: 27,409 Region Association: Rocky Mountains
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QUOTE(fiacra @ Oct 18 2024, 03:54 PM)  Not the person to ask about how to calibrate your MPS, but if you are looking to have it rebuilt, or to buy a rebuilt MPS: Jeff Bowlsby: https://bowlsby.net/914/WiringHarnesses/#Miscellaneous Auto Atlanta: http://www.autoatlanta.com/Porsche-Rebuilt...B039906051.html Tangerine Racing sells a repair/calibration kit, but the website shows the diaphragm as being out of stock right now. There are probably other vendors, but that's what comes to mind right now. Good luck! Looking at the parts from Tangerine, it looks like the parts in mine. I have that brass diaphragm and the black cap on the outer adjustment hole. It might be the kit they used (IMG:style_emoticons/default/confused24.gif). Thanks for those options, if nothing else I will need to pickup one of those rebuilt ones. |
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Posts in this topic
slapshot D-Jet Conversion not going as planned. Oct 18 2024, 03:08 PM
Robarabian Easy Supplier with warranty as well:
https://fuel... Oct 18 2024, 05:30 PM
JeffBowlsby Try manually pumping the MPS up to 15 inHg and sta... Oct 18 2024, 04:28 PM slapshot
Try manually pumping the MPS up to 15 inHg and st... Oct 18 2024, 04:44 PM JeffBowlsby dbl post Oct 18 2024, 04:30 PM Craigers17 I’m sure you’ve already checked this off on yo... Oct 18 2024, 04:53 PM slapshot
I’m sure you’ve already checked this off on y... Oct 18 2024, 05:03 PM JeffBowlsby Post a photo of how the 123 wires are installed to... Oct 18 2024, 04:57 PM slapshot Here's a pic and a pic of the diagram from wha... Oct 18 2024, 05:12 PM JeffBowlsby Thx, that’s trigger points connection and looks ... Oct 18 2024, 06:19 PM TheCabinetmaker Do you hear the fuel pump come on for a half secon... Oct 18 2024, 05:42 PM slapshot
Do you hear the fuel pump come on for a half seco... Oct 18 2024, 07:27 PM JeffBowlsby Are you getting spark at the plugs?
Injectors ver... Oct 18 2024, 07:38 PM slapshot
Are you getting spark at the plugs?
Injectors ve... Oct 18 2024, 10:37 PM emerygt350 Can you keep it running with starter fluid? Oct 18 2024, 07:38 PM slapshot
Can you keep it running with starter fluid?
I tr... Oct 18 2024, 10:48 PM JamesM
I am converting back to D-Jet and my car will sta... Oct 18 2024, 08:49 PM emerygt350 That is very strange. Have you checked the oil? ... Oct 19 2024, 07:47 AM slapshot The CHT resistance is 2150 @ 65 degrees. Oct 19 2024, 10:29 AM emerygt350 That seems reasonable. Oct 19 2024, 03:29 PM emerygt350 One thing you could try is lowering the fuel press... Oct 19 2024, 03:32 PM slapshot I will try that. Oct 19 2024, 04:14 PM slapshot No change after turning it down to 24. The engine ... Oct 20 2024, 12:27 PM Spoke The engine starts while cranking but dies a second... Oct 21 2024, 12:27 PM slapshot
The engine starts while cranking but dies a secon... Oct 21 2024, 01:57 PM Spoke
[quote name='Spoke' post='3173882' date='Oct 21 2... Oct 21 2024, 02:11 PM brant fuel spark timing
I would verify spark with a tim... Oct 20 2024, 12:33 PM slapshot I'm not able to check timing since it will not... Oct 20 2024, 01:24 PM emerygt350 "and it wouldn’t crank over for a while... Oct 20 2024, 05:06 PM slapshot After spraying a good amount of starter fluid into... Oct 20 2024, 07:48 PM JeffBowlsby Do you know if this ECU is functioning? You can h... Oct 20 2024, 08:00 PM slapshot I don't know. I'll get a noid light tomorr... Oct 20 2024, 09:48 PM emerygt350 Again, i am confused by " it would not crank ... Oct 21 2024, 07:00 AM slapshot
Again, i am confused by " it would not crank... Oct 21 2024, 11:39 AM dr914@autoatlanta.com no calibration necessary, make sure that you have ... Oct 21 2024, 08:59 AM rjames As MJames stated, the MPS is critical.
Yes you... Oct 21 2024, 11:29 AM slapshot
As MJames stated, the MPS is critical.
Yes yo... Oct 21 2024, 01:50 PM rjames
As MJames stated, the MPS is critical.
Yes y... Oct 21 2024, 03:23 PM JamesM
How sensitive is that inner screw? If I move it ... Oct 23 2024, 04:07 PM emerygt350 And I don't think the injector timing will mat... Oct 21 2024, 06:15 PM rjames Just noticed that you stated early in the thread t... Oct 21 2024, 06:27 PM sixnotfour no injection.. Oct 21 2024, 06:51 PM slapshot I inserted a noid light on each injector wires, ex... Oct 21 2024, 11:08 PM Spoke Starter fluid in the TB seems to just flood it.
... Oct 22 2024, 02:37 AM slapshot I sprayed starter fluid into an open TB for two or... Oct 22 2024, 06:05 AM slapshot Here's a link to video of noid light test from... Oct 22 2024, 06:26 AM rjames
Yes, the outer most screw is the full load stop ... Oct 22 2024, 09:00 AM Superhawk996 Tangerine directions
Oct 22 2024, 09:42 AM slapshot I haven't pulled out the diaphragm on mine. I... Oct 22 2024, 10:41 AM emerygt350 To adjust it, as others mentioned, you need the sp... Oct 22 2024, 10:42 AM slapshot Here's a video of attemping startup.. Oct 22 2024, 03:19 PM Artfrombama
Here's a video of attemping startup..
I... Oct 22 2024, 04:49 PM brant
[quote name='slapshot' post='3174041' date='Oct 2... Oct 22 2024, 05:07 PM slapshot
[quote name='slapshot' post='3174041' date='Oct ... Oct 22 2024, 05:20 PM emerygt350 Sounds like really retarded timing. Sounds good o... Oct 22 2024, 05:26 PM brant Go back to the basics
Pull the distributor
Put t... Oct 22 2024, 06:25 PM sixnotfour switch the fuel fuel lines Oct 22 2024, 06:48 PM slapshot You all were right. I pulled the dist, set TDC an... Oct 22 2024, 07:04 PM Artfrombama
You all were right. I pulled the dist, set TDC a... Oct 22 2024, 09:27 PM slapshot Thanks to all that contributed. It sure is great ... Oct 22 2024, 10:34 PM emerygt350 Now you can get down to the fun of d-jet. Set you... Oct 23 2024, 05:17 AM FlacaProductions I've read that "canned air" (Dust-Of... Oct 23 2024, 02:30 PM brant Agreed
Don’t touch the MPs any more until you h... Oct 23 2024, 04:52 PM rjames You can make a cheap homemade smoke 'machine... Oct 23 2024, 04:53 PM JeffBowlsby
Even if someone were to calibrate an MPS for you,... Oct 23 2024, 05:24 PM slapshot
Also, do you know if they changed the cam on your... Oct 24 2024, 06:58 AM brant Did you set the timing with a strobe light yet?
A... Oct 23 2024, 05:04 PM slapshot I have a smoke box and pushed smoke through it tod... Oct 23 2024, 10:34 PM emerygt350 You can do that without moving the screws. It rea... Oct 24 2024, 05:31 AM slapshot
You can do that without moving the screws. It re... Oct 24 2024, 07:20 AM rjames
[quote name='emerygt350' post='3174192' date='Oct... Oct 24 2024, 10:09 AM slapshot
After you open the MPS there are 4 screws that ho... Oct 24 2024, 03:37 PM emerygt350
[quote name='rjames' post='3174214' date='Oct 24 ... Oct 24 2024, 05:47 PM brant I would get the tuned first
You can’t expect it... Oct 24 2024, 08:40 AM slapshot With the smoke test, I get smoke coming out each s... Oct 25 2024, 08:42 AM rjames
With the smoke test, I get smoke coming out each ... Oct 25 2024, 12:37 PM slapshot
With the smoke test, I get smoke coming out each... Oct 25 2024, 01:02 PM brant It’s rebuildable
But no kit
A difficult job with... Oct 25 2024, 09:07 AM emerygt350
It’s rebuildable
But no kit
A difficult job wit... Oct 25 2024, 10:49 AM slapshot Now the BIG issue. I am working on setting the ti... Oct 25 2024, 11:52 AM slapshot I set the timing even though I'm confused on w... Oct 25 2024, 01:18 PM emerygt350 That throttle shaft leak will add some rpms, is yo... Oct 25 2024, 03:28 PM slapshot I have the retard hose plugged into the dizzy but ... Oct 25 2024, 05:40 PM r_towle What is your dwell?
Timing set with no vacuum? Oct 25 2024, 06:31 PM r_towle Also, have you cleaned and re greased the advance ... Oct 25 2024, 06:34 PM emerygt350 It is a 123 towle, at least I think it is.
I wo... Oct 25 2024, 06:56 PM emerygt350 I suspect your misfires and stalls are timing and ... Oct 25 2024, 06:58 PM slapshot I do have a 123 dizzy so no dwell to mess with and... Oct 25 2024, 09:12 PM emerygt350 I use a boroscope to ensure tdc, but what you did ... Oct 26 2024, 05:46 AM slapshot
I use a boroscope to ensure tdc, but what you did... Oct 26 2024, 10:26 AM JamesM That's a lot of advance at idle. Likely kicki... Oct 26 2024, 03:09 PM emerygt350
That's a lot of advance at idle. Likely kick... Oct 26 2024, 04:50 PM slapshot
That's a lot of advance at idle. Likely kic... Oct 28 2024, 10:50 AM emerygt350
[quote name='emerygt350' post='3174553' date='Oct... Oct 28 2024, 11:32 AM Geezer914 There are throttle body shaft seals you can order. Oct 26 2024, 06:59 AM slapshot
There are throttle body shaft seals you can order... Oct 26 2024, 10:06 AM emerygt350 Well, looks like that TPS board is in your future.... Oct 26 2024, 12:25 PM emerygt350 If it's looking lean and you want to richen it... Oct 28 2024, 11:34 AM |
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