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930 suggestions on trouble shooting

Recently my 88 930 has been experiencing problems.
The car looses spark and just dies when it get's to operation mid/temperature.
I can go back to the car after an hour turn it on and move it .
So I know it's not battery or electrical related .
Carl's place in Las Vegas Nevada;
Believed it was from the CDI box .( controlling ignition )
Sent it off to pelican and had it rebuilt . Didn't fix it .
Prestine motorsports in Huntington Beach ;
Told me to check the ignition cut off relay .
Turbo boost control relay . & both crank shaft marker sensors.
Any ideas .? Thank you for your time and consideration
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Scott D Anderson
88 930 Turbo
74 914 LE Bumble Bee
Old 09-20-2017, 04:45 PM
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Check out our thread on why our cars won't start or just stop running:

Sticky for common answers to why "My car doesn't start...."

Probably a relay. Could be yellow relay in engine bay. Would also suggest fuel pump relays in frunk but you said you are losing spark. You may also want to check the coil since you did not mention checking it already.

Let us know after you look through this thread and do some more checking. You'll find the cause, don't worry.
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Emery

1988 930 coupe - Silver Metallic
stock 3.3L w/GT35R, B&B Headers, RarlyL8 muffler, B&B intercooler, Tial wastegate, Electromotive tecGT based phased sequential EFI & ignition, Wevo shifter
Old 09-20-2017, 05:51 PM
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you say it loses spark.
did you verify this by checking for spark when it will not run?

if so it could be the coil.
its a 50-50 shot when the engine loses spark when it hot as to the coil or the CD.
the coil is cheaper, plus if it is not the coil, at least you have a spare.
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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 09-21-2017, 04:31 AM
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coil bosch
Old 09-21-2017, 10:45 AM
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All new:
1)coil, 2) cap, 3) rotor 4) points 5) plugs 6) CDI ( brain box )
Moving to Ignition relay next.
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Scott D Anderson
88 930 Turbo
74 914 LE Bumble Bee
Old 09-21-2017, 04:59 PM
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No points in that car.

My bet is you have a bad relay. Probably a cracked board, wire trace, or solder joint. When it heats up the gap expands and electricity ceases to flow. When it cools the gap shrinks and the connection is remade.
Old 09-21-2017, 05:15 PM
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Don't forget the green wire ...
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Old 09-21-2017, 05:48 PM
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Absolutely; the distrubutor's green colored, coaxial wire is a known failure point (gets old and heated, and insulation cracks off of it - usually very close to the distributor body). Visually check it out and also see if you can cause the engine to stall by moving it around while engine is running.

Quote:
Originally Posted by ScottDAnderson View Post
. . . & both crank shaft marker sensors.
No such sensors on your car.
Old 09-21-2017, 07:06 PM
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THATS the problem, he put points in it!!

you HAVE to check for spark when it will not 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 09-22-2017, 03:55 AM
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Oops. No points. Was stuck in 914 mode.
MSD Electronic Ignition.
1) will check green wire.
2) Not sure where the board is
A) I replaced mother board on my 914 but 930.?
B) doesn't the CDI act the same as the 914 mother board

Thank you for all the help.
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Scott D Anderson
88 930 Turbo
74 914 LE Bumble Bee
Old 09-22-2017, 06:50 AM
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is the MSD a new 6al with the LED that shows that it is getting the trigger from the dist.
if so look for the trigger.

have you verified it is not getting spark or just assuming it is not getting spark
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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 09-22-2017, 07:08 AM
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No LED on the MSD.
I can put the pen that shows spark,
To the MSD component and check that as well.
We tested the CDI box and the pen showed spark, then cut out and the car would die.
that was BEFORE we sent it off to Pelican. Now that component is new/rebuilt. And moving on to the Yellow relay next.
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Scott D Anderson
88 930 Turbo
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Old 09-22-2017, 09:02 AM
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Quote:
Originally Posted by ScottDAnderson View Post
No LED on the MSD.
I can put the pen that shows spark,
To the MSD component and check that as well.
We tested the CDI box and the pen showed spark, then cut out and the car would die.
that was BEFORE we sent it off to Pelican. Now that component is new/rebuilt. And moving on to the Yellow relay next.
You can remove the relay and jumper the sockets to run the car without it and prove whether it is the problem or not before you go get another one.

here is a great description on what to do that can be found in the sticky for common answers to why my car doesn't start.

Sticky for common answers to why "My car doesn't start...."


When I took mine apart, it was obvious that is was bad and I was shocked the car ran at all.
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Old 09-22-2017, 09:11 AM
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the yellow relay controls the fuel pumps NOT the ignition.

I don't understand your last post?
pen?
cut out and car would die? what does that mean,

pull a plug wire and put a spare plug on and test for spark.
you can also use a timing light, I prefer the spark plug.
you need to do this when it will not 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 09-22-2017, 09:30 AM
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If things all check out as mentioned by pelican members as above and problem still there, it may be your speed relay under the driver seat, if that is bad it will shut pumps off at any rpm.
Old 09-22-2017, 09:50 AM
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The mechanic used a pen / tool that he could place on the wires (would show spark / light up )
The pen tool and was dark when there wasn't any spark.
We placed it on the wires coming out of the CDI box .
This was Lit up showing light/ spark then showing failure, or no spark ( dark pen/tool )
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Scott D Anderson
88 930 Turbo
74 914 LE Bumble Bee
Old 09-22-2017, 10:23 AM
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The jumper test on the fuel relay is an easy try.
i like the "If it's not broken, don't fix it"
Feel dumb fixing the CDI box and that's not the problem .!
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Scott D Anderson
88 930 Turbo
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Old 09-22-2017, 10:27 AM
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yes, that's why I am trying to get clear info on what you have done.

not sure what pen he is using and what or where he is putting it on the wires so I don't trust the results. the voltage coming out of the CD is only about 450v, coming out of the coil it is 100x that, about 45kv. yea you can use a neon bulb to pick up voltage but I don't know if it will work on the low voltage side plus I have never done it on an ignition.

either use a sparkplug on a plug wire on use a timing light when it will not start.
you HAVE to confirm spark at this point.

if it is ignition then its probably the coil.
the coil is the first thing I would have replaced, its cheaper plus if that is not the issue you know have a spare coil.
next would be to verify the CD is getting power all the time.
I don't know what MSD you have but they usually want one power source going directly to the battery and the other source is switched power.
if switched power Is from the CD connector then it is coming from the delayed action relay that keeps power on the CD once the switch is turned off.

if has spark we can down that path.

a plug or timing light,
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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 09-22-2017, 11:04 AM
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Thanks Fellow Enthusiast's...!
I will pick this back up next Monday.
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Scott D Anderson
88 930 Turbo
74 914 LE Bumble Bee
Old 09-22-2017, 01:47 PM
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Quote:
Originally Posted by ScottDAnderson View Post
The jumper test on the fuel relay is an easy try.
i like the "If it's not broken, don't fix it"
Feel dumb fixing the CDI box and that's not the problem .!
It would be a great help to those trying to help you if you would use complete sentences, appropriate punctuation, and reasonable grammar to write an actual narrative describing the problem, the components, and the history of the problem and attempts to correct it. It would be much easier to follow than the tiny servings of fragmented English, sentence fragments, and incomplete information provided to date.

Perhaps consider starting over?
Old 09-22-2017, 02:43 PM
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