 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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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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| Robarabian |
Oct 18 2024, 05:30 PM
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#3
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914 A Roo Group: Members Posts: 631 Joined: 11-February 19 From: Simi Valley, Kalifornia Member No.: 22,865 Region Association: Southern California
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Easy Supplier with warranty as well:
https://fuelinjectioncorp.com QUOTE(fiacra @ Oct 18 2024, 02:54 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! |
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Posts in this topic
slapshot D-Jet Conversion not going as planned. Oct 18 2024, 03:08 PM
slapshot
Not the person to ask about how to calibrate your... Oct 18 2024, 04:41 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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