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CorsePerVita
Joined: 25 Jul 2008
Posts: 1992
Location: Redmond, Oregon
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 Posted: Thu Jan 05, 2017 3:15 am Post subject: Crank, no sparkie. |
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single digits returned. the turbo sputtered at me about 6 times, acted like it was going to fire, then nothing.
now it'll crank with absolutely no issues, but isn't sputtering. tried starting fluid. is acting like it just doesn't want to fire.
ol' reliable (my '79 924) fired right up. The turbo is starting to drive me nuts.
It ONLY does this in below freezing conditions.
- New MSD coil in the last year
- New wires in the last year
- Need to replace spark plugs but they aren't that bad
Do the MSD coils have cold issues? Currently 5F.
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- 1977 Porsche 924 2.0 N/A (Trackday Project)
- 1979 Porsche 924 2.0 N/A (The other daily)
- 1980 Porsche 931 (Daily)
- 1987 Lamborghini Jalpa
- 1999 Ducati 900SS |
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Mike9311
Joined: 14 Dec 2004
Posts: 1678
Location: Chicago-ish
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| Posted: Thu Jan 05, 2017 4:20 am Post subject: |
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WHat kind of plugs are they?
_________________
1980 931 since 1989
1981 Ideola 931 Club Sport
1982 931 Entwicklungsfahrzeug
1979 924 NA ohne 650 mit 471
1982 931 Red Resurrection - 951 IC
1982 931 parts car / resurrection?
1980 924 NA (R&D lightweight)
1982 931 wana-be GTR race car |
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ideola
Joined: 01 Oct 2004
Posts: 15548
Location: Spring Lake MI
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| Posted: Thu Jan 05, 2017 5:45 am Post subject: |
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You may have fouled the plugs in the process. Remove them, spray with brake cleaner, and burn off with a lighter/torch.
Check all the positive connections at the battery post.
Wondering if the ignition unit on the inner LHS fender is starting to fail?
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erstwhile owner of just about every 924 variant ever made |
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CorsePerVita
Joined: 25 Jul 2008
Posts: 1992
Location: Redmond, Oregon
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| Posted: Thu Jan 05, 2017 6:12 am Post subject: |
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| Mike9311 wrote: | | WHat kind of plugs are they? |
BP6RES if memory serves.
_________________
- 1977 Porsche 924 2.0 N/A (Trackday Project)
- 1979 Porsche 924 2.0 N/A (The other daily)
- 1980 Porsche 931 (Daily)
- 1987 Lamborghini Jalpa
- 1999 Ducati 900SS |
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CorsePerVita
Joined: 25 Jul 2008
Posts: 1992
Location: Redmond, Oregon
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| Posted: Thu Jan 05, 2017 6:14 am Post subject: |
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| ideola wrote: | You may have fouled the plugs in the process. Remove them, spray with brake cleaner, and burn off with a lighter/torch.
Check all the positive connections at the battery post.
Wondering if the ignition unit on the inner LHS fender is starting to fail? |
Well, it is 5F outside. I suppose it's possible it is trying to start so rich it's fouling. I have some brand new plugs. I'll go put them in and report back. Currently the snow is f***ing insane and up to my knees, so, wish me luck and stuff.
_________________
- 1977 Porsche 924 2.0 N/A (Trackday Project)
- 1979 Porsche 924 2.0 N/A (The other daily)
- 1980 Porsche 931 (Daily)
- 1987 Lamborghini Jalpa
- 1999 Ducati 900SS |
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Mike9311
Joined: 14 Dec 2004
Posts: 1678
Location: Chicago-ish
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| Posted: Thu Jan 05, 2017 6:26 am Post subject: |
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| CorsePerVita wrote: | | Mike9311 wrote: | | WHat kind of plugs are they? |
BP6RES if memory serves. |
ok, cool. I had an issue before with thin platinum electrodes that are even with the insulator. The gap turned out to be larger due to the electrode burning down into the insulator. I kept checking the gap and thought it was fine. Then I took a closer look and saw a hole instead of the electrode. Gap was actually MUCH larger
You don't have that issue
_________________
1980 931 since 1989
1981 Ideola 931 Club Sport
1982 931 Entwicklungsfahrzeug
1979 924 NA ohne 650 mit 471
1982 931 Red Resurrection - 951 IC
1982 931 parts car / resurrection?
1980 924 NA (R&D lightweight)
1982 931 wana-be GTR race car |
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CorsePerVita
Joined: 25 Jul 2008
Posts: 1992
Location: Redmond, Oregon
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| Posted: Thu Jan 05, 2017 7:00 am Post subject: |
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Just installed new BP7RES plugs. It fired 5-6 times, didn't start. Very close, but no go.
Going to leave it on the battery tender and block heater for a bit. It's still about 10F right now.
_________________
- 1977 Porsche 924 2.0 N/A (Trackday Project)
- 1979 Porsche 924 2.0 N/A (The other daily)
- 1980 Porsche 931 (Daily)
- 1987 Lamborghini Jalpa
- 1999 Ducati 900SS |
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CorsePerVita
Joined: 25 Jul 2008
Posts: 1992
Location: Redmond, Oregon
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| Posted: Thu Jan 05, 2017 9:20 am Post subject: |
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Hours later.... cranked and cranked and cranked and cranked and FINALLY started. Finally. Warming it up. So long as it stays warmed up and on the pan heater, it'll probably start in the morning despite it supposed to get down to like -5F tonight.
_________________
- 1977 Porsche 924 2.0 N/A (Trackday Project)
- 1979 Porsche 924 2.0 N/A (The other daily)
- 1980 Porsche 931 (Daily)
- 1987 Lamborghini Jalpa
- 1999 Ducati 900SS |
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CorsePerVita
Joined: 25 Jul 2008
Posts: 1992
Location: Redmond, Oregon
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| Posted: Thu Jan 05, 2017 3:24 pm Post subject: |
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Tried regular cranking, stubborn as hell. Seems to be running really rich. Was able to coax it to start at 5F with some starting fluid after some cranking and new spark plugs. Still stubborn as hell. Going to be -5 tonight. These temps can just go away. lol
_________________
- 1977 Porsche 924 2.0 N/A (Trackday Project)
- 1979 Porsche 924 2.0 N/A (The other daily)
- 1980 Porsche 931 (Daily)
- 1987 Lamborghini Jalpa
- 1999 Ducati 900SS |
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morghen
Joined: 21 Jan 2005
Posts: 8889
Location: Romania
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| Posted: Thu Jan 05, 2017 6:04 pm Post subject: |
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Does the cold start valve work?
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https://www.the924.com |
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CorsePerVita
Joined: 25 Jul 2008
Posts: 1992
Location: Redmond, Oregon
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| Posted: Sun Jan 08, 2017 11:03 am Post subject: |
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| morghen wrote: | | Does the cold start valve work? |
Seems to be. Cold start is 1500rpm, and then slowly moves to 1000rpm once warmed up. What should the high idle when cold be? I'm looking all over for a default value and can't seem to find one.
I just cleaned the cap and rotor, they were worse than I thought, and the car fired up a lot easier. So new plugs, cap and rotor cleaned up. Seemed to have a lot less effort starting.
So that's some progress. It's still being rather stubborn at these temps, but it's far better than it was. I think I must still be seeing some issues with the cold start valve, or perhaps injector. It's still snowing like a blizzard out there.
I at least checked the following:
Blaster coil resistance:
- Primary is .6.-7
- Secondary is 4600
This appears to be within acceptable spec.
I checked the AAV and it is indeed getting 13.6v once car is started and running. Resistance on the aav between the two points is 0.
Need to actually pull things so that I can test them and see what they are doing, but at least I got a brief window of time to try some things out. It's certainly firing a lot better than it was, and less temperamental.
_________________
- 1977 Porsche 924 2.0 N/A (Trackday Project)
- 1979 Porsche 924 2.0 N/A (The other daily)
- 1980 Porsche 931 (Daily)
- 1987 Lamborghini Jalpa
- 1999 Ducati 900SS |
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morghen
Joined: 21 Jan 2005
Posts: 8889
Location: Romania
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| Posted: Sun Jan 08, 2017 7:16 pm Post subject: |
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Cold start valve is that 5th injector, that's what I was asking if its firing at start.
If you have condensation in the dizzy cap it wont start. Maybe the dizzy cap is not seated properly on the dizzy body and humid air gets in?
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https://www.the924.com |
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CorsePerVita
Joined: 25 Jul 2008
Posts: 1992
Location: Redmond, Oregon
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| Posted: Mon Jan 09, 2017 5:48 pm Post subject: |
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| morghen wrote: | Cold start valve is that 5th injector, that's what I was asking if its firing at start.
If you have condensation in the dizzy cap it wont start. Maybe the dizzy cap is not seated properly on the dizzy body and humid air gets in? |
Pulled the cap earlier, no condensation in cap. Cap seated properly. After cleaning up the cap and rotor, it's firing easier, but still needing a bit of starting fluid in the extreme cold to get it to start up.
I'm wondering if the cold start injector isn't firing, because that seems to point to lack of fuel when cold.
_________________
- 1977 Porsche 924 2.0 N/A (Trackday Project)
- 1979 Porsche 924 2.0 N/A (The other daily)
- 1980 Porsche 931 (Daily)
- 1987 Lamborghini Jalpa
- 1999 Ducati 900SS |
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ideola
Joined: 01 Oct 2004
Posts: 15548
Location: Spring Lake MI
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| Posted: Mon Jan 09, 2017 11:03 pm Post subject: |
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It might be worth getting one of those el cheapo Harbor Freight ultrasonic cleaners and running the CSV in it.
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erstwhile owner of just about every 924 variant ever made |
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