 1.7 d-jet '73 almost running |
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| isdyl |
 Feb 29 2020, 06:15 AM
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#1
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Member  Group: Members Posts: 113 Joined: 13-June 18 From: Woking, UK Member No.: 22,217 Region Association: England  |
Hi all - so I've refitted d-jet on my 1.7 which had a single weber when I bought it. It's almost running but I've run out of ideas as to what to adjust or check. I've recorded a video of it starting. You'll hear that it starts quite lumpily and wants to stall. I manage to get the revs up by feathering the throttle and they go up to 2.5 or 3000 revs on their own for a second, and then it all dies again. I can keep it running by feathering the throttle again.
https://www.youtube.com/watch?v=Y06kdQC2IZg Fuel pressure when running is 2 BAR. Theres no cold start valve connected. All injectors are 'squirting' as I took them out and checked in a jam jar. I've tried adjusting timing, mixture screw, air screw. I haven't checked the valve clearances yet but have had the distributor in 100 different settings with no improvement. I just wondered if anyone has any ideas please? Thanks, Dylan |
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| BeatNavy |
Mar 1 2020, 06:59 AM
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#2
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Certified Professional Scapegoat Group: Members Posts: 2,945 Joined: 26-February 14 From: Easton, MD Member No.: 17,042 Region Association: MidAtlantic Region 
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These are legit suggestions, but IMO you do have to prioritize the fundamentals such as valves and dwell/timing (which can be difficult if it won't stay running of course). If it won't stay running after that then it is definitely time to test / troubleshoot the D-Jet components that have the biggest impact on mixture (e.g., MPS and CHT). After you get it to the point that it will stay running, then you can focus things that impact drivability and reliability more (e.g., TPS, AAR, CSV, decal valve, etc.). As Spoke says the AFR is good for troubleshooting that at some point if you don't already have one.
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| isdyl |
Mar 1 2020, 10:33 AM
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#3
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Member Group: Members Posts: 113 Joined: 13-June 18 From: Woking, UK Member No.: 22,217 Region Association: England |
Great - thanks. I'll get on to it. D
QUOTE(BeatNavy @ Mar 1 2020, 06:59 AM)  These are legit suggestions, but IMO you do have to prioritize the fundamentals such as valves and dwell/timing (which can be difficult if it won't stay running of course). If it won't stay running after that then it is definitely time to test / troubleshoot the D-Jet components that have the biggest impact on mixture (e.g., MPS and CHT). After you get it to the point that it will stay running, then you can focus things that impact drivability and reliability more (e.g., TPS, AAR, CSV, decal valve, etc.). As Spoke says the AFR is good for troubleshooting that at some point if you don't already have one. |
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Posts in this topic
isdyl 1.7 d-jet '73 almost running Feb 29 2020, 06:15 AM
BeatNavy You haven't run out of ideas - you haven't... Feb 29 2020, 06:29 AM
isdyl Ok thanks - I was hoping to avoid climbing under t... Feb 29 2020, 06:41 AM BeatNavy
Ok thanks - I was hoping to avoid climbing under ... Feb 29 2020, 06:52 AM BeatNavy I will add that if you've had the distributor ... Feb 29 2020, 06:45 AM isdyl Yes I'm not sure where it is set now! I in... Feb 29 2020, 06:54 AM BeatNavy Don't forget that dwell though (assuming you h... Feb 29 2020, 06:57 AM TheCabinetmaker Have you checked vacuum on the mps? How about the ... Feb 29 2020, 06:02 PM Bleyseng
Have you checked vacuum on the mps? How about the... Feb 29 2020, 07:48 PM Spoke It would help to have an AFR sensor to tune your F... Mar 1 2020, 12:08 AM isdyl Hi - Thanks for your replies. I have checked the h... Mar 1 2020, 02:07 AM isdyl Follow up - TPS is all working correctly.
Hi - T... Mar 1 2020, 06:56 AM euro911 :agree: on the valve adjustment taking priority. M... Mar 1 2020, 02:45 AM isdyl Thanks - I'd better get under that car....
... Mar 1 2020, 03:09 AM Tdskip Just a thought - you have flow when testing the in... Mar 1 2020, 04:40 PM isdyl Hi - there is a cold start injector but it’s not... Mar 2 2020, 12:47 AM ndfrigi
Hi - there is a cold start injector but it’s no... Mar 2 2020, 01:03 AM isdyl Yes that’s about 2 bar - should it hold at that ... Mar 2 2020, 01:13 AM BeatNavy I've heard conflicting things on whether it sh... Mar 2 2020, 06:02 AM isdyl Thanks very much, and yes I'm on the case re t... Mar 2 2020, 07:29 AM isdyl Hi all,
So I've checked the valve gaps and all... Mar 14 2020, 10:59 AM 914_teener
Hi all,
So I've checked the valve gaps and al... Mar 14 2020, 12:22 PM porschetub [quote name='isdyl' date='Mar 15 2020,... Mar 14 2020, 02:58 PM Bleyseng We check a MPS by putting 15 hg of vacuum on them ... Mar 14 2020, 12:54 PM isdyl Thank you. I'll do as you suggest. Dylan Mar 14 2020, 01:56 PM TheCabinetmaker Just because the mps holds vacuum does not mean it... Mar 14 2020, 02:48 PM isdyl Thank you for your suggestions. From the video I p... Mar 15 2020, 04:11 AM BeatNavy Go ahead and take out and clean the dizzy as Porsc... Mar 15 2020, 05:57 AM isdyl Will do, and thanks again for your help.
Dylan
G... Mar 15 2020, 11:43 AM ClayPerrine Dylan,
That stuff sat in my garage for years bef... Mar 16 2020, 11:44 AM isdyl Thanks Clay - I’ll do all those things. There wa... Mar 16 2020, 12:10 PM PCH We've recently problem solved the following: G... Mar 16 2020, 12:18 PM isdyl Thanks. Actually there is a spare set of trigger p... Mar 16 2020, 02:52 PM isdyl Hi,
I've spent a long time trying to improve t... Apr 15 2020, 10:07 AM BeatNavy There are some vagaries about which sensor you sho... Apr 15 2020, 10:32 AM isdyl Hi - yes I'm sure I have the timing & dwel... Apr 15 2020, 10:44 AM isdyl Oh I forgot to say that it will only 'tick ove... Apr 15 2020, 10:48 AM isdyl I swapped the sensor out for a 2k resistor just to... Apr 15 2020, 01:25 PM BeatNavy So you just put a 2k resistor between wiring harne... Apr 15 2020, 01:48 PM isdyl Yes, just the resistor between the harness wire an... Apr 15 2020, 02:11 PM Bmw635 Check your fuel filter as it may be clogged. I flu... Apr 15 2020, 02:25 PM isdyl Thanks - I've had that on a few previous cars ... Apr 15 2020, 02:30 PM ctc911ctc Hi,
I went down all of the paths that you did wit... Apr 15 2020, 03:42 PM isdyl Thanks - ok so I've done a bit of testing this... Apr 16 2020, 03:22 AM isdyl Hi - sorry to keep asking questions - I'm stil... Apr 20 2020, 03:36 AM ctc911ctc Getting all of those leaks will result in a fine r... Apr 20 2020, 08:14 AM Bleyseng yes, the spacers come with a paper gasket glued to... Apr 20 2020, 07:55 AM euro911 I didn't read through all the replies so I... Apr 20 2020, 12:22 PM isdyl Hi, I haven't actually, but that's mainly ... Apr 20 2020, 02:11 PM ctc911ctc Does it die as if you turned the key off? Or does ... Apr 20 2020, 03:06 PM isdyl Not quite as quickly as if the key is switched off... Apr 21 2020, 04:39 AM isdyl Hi - here's a video of it just running out of ... Apr 21 2020, 10:51 AM isdyl Plugs are very sooty so maybe too much fuel? Quest... Apr 24 2020, 11:42 AM BeatNavy You would see abnormally high fuel pressure. Apr 24 2020, 11:49 AM isdyl Thanks
I would love to solve this issue myself bu... Apr 25 2020, 10:58 AM isdyl It's working! It's working!! I... May 5 2020, 09:26 AM BeatNavy Was it a blown diaphragm on the MPS? I can't ... May 5 2020, 12:20 PM isdyl I'm not sure - it seems to not leak when you s... May 5 2020, 02:27 PM |
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