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1986 930 Turbo no start

Good fuel pressure, starts for a few seconds with ether hence spark good, starts with air meter plate pushed down slightly but won't run- any solutions to my puzzle?
Old 10-31-2017, 08:01 PM
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User Brasch posted a diagram of the fuel system relays, etc in this thread.
You should be able to 'jump' one or more relays to see where the problem is.

1986 turbo - Troubleshooting ignition failure
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1986 911 turbo - less than 30k miles
Old 11-01-2017, 10:37 AM
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how do you know the Fuel pressure is good?

first thing I would do Is remove the connector on the top rear of the AFM, then try to start it.
this will run both pumps all the time.
then with the key on, I would remove each FP rly one at a time for just a second to verify BOTH pumps run.

does it have gas in it? don't ask....

check to make sure the CD whines with the key on. I know it appears that you have spark, it could be an issue with the ignition relay. just make sure the CD has power after you start it and it cuts off.

will it run if you keep the air meter plate pushed down?

does the frequency valve vibrate with the key on?
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86 930 42kmiles [__] RUNNING:[__] NOT RUNNING: ____77 911S widebody: SOLD
88 BMW 325is 200K+ [__] RUNNING: [__] NOT RUNNING:
05 BMW 330CI 130K:: [__] RUNNING: [__] NOT RUNNING:
08 VOLVO V70 190K:: [__] RUNNING: [__] NOT RUNNING:
90 B2200[] RUNNING:[_] NOT RUNNING:__2000 MER E320 WAGON [_] WRECKED:[]RUNNING:
Old 11-01-2017, 10:41 AM
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Make certain that none of your seals are leaking. You can sometime pinch a seal on the throttle body turbo or up-tubes.
Old 11-01-2017, 06:13 PM
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Runs with meter plate pushed down so what is the problem?
Old 11-02-2017, 04:46 PM
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you need to check control pressure. sounds like it is too hi.
may be a clog in the return side from the WUR.
check the inlet screen on the WUR

this was miss leading

"starts with air meter plate pushed down slightly but won't run
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86 930 42kmiles [__] RUNNING:[__] NOT RUNNING: ____77 911S widebody: SOLD
88 BMW 325is 200K+ [__] RUNNING: [__] NOT RUNNING:
05 BMW 330CI 130K:: [__] RUNNING: [__] NOT RUNNING:
08 VOLVO V70 190K:: [__] RUNNING: [__] NOT RUNNING:
90 B2200[] RUNNING:[_] NOT RUNNING:__2000 MER E320 WAGON [_] WRECKED:[]RUNNING:
Old 11-03-2017, 03:52 AM
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I had the same issue w/ my 86 930. In the end it turned out that the battery was bad. I replaced the battery and it's run since.

Also, prior to this there were numerous vacuum leaks that were due to cracked/old o-rings and hoses. These vacuum leaks led to high-idle and no-idle conditions as well.
Old 11-04-2017, 08:26 AM
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