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84 Porsche 911 with '89 930 engine dies

My M491 modified 911 died on the road the other day. And it wouldnt start again. If I left it alone for at least 10 minutes, the motor would try to run but no matter how I played with the gas pedal, it wouldnt stay running.

It feels like its starved for fuel so I bought a CIS bosch S&G tools fuel pressure gauge tester.

My results are (at 56 degrees):
Cold Control pressure 2.4 bar
Warm control pressure 4.0
System pressure 6.7

For my engine 930/68, I found these parameters online:

- System pressure: 6.7-7.4 Bar
- Cold control pressure:
- "Without charging pressure" = 1.4-1.8 bar at 10C; 2.0-2.4 bar at 20C; 2.3-2.7 bar at 25C
- "With charging pressure" = 0.9-1.3 bar at 10C; 1.5-1.9 bar at 20C; 1.8-2.2 bar at 25C

- Warm control pressure: 3.75 +/- 0.2 bar
- Full throttle enrichment: 2.9 +/- 0.2 bar

Leak test: min. pressure after 10 min = 1.6 bar; min pressure after 20 min. = 1.4 bar

What do I do now? Are my results within reason? Is it electrical?
I really appreciate anyone helping me with this!
I havent gotten to enjoy this car more than 15 total miles...and I've had it since September!
Eddie

Old 12-14-2019, 05:55 PM
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So, apparently you go the car home and it started to do the fuel pressure tests?
Is this correct?
If this is correct the problem could be your Bosch CDI unit.

For warm-up regulator Part No. 930.606.105.03 Bosch No. 0 438 140 054
I have these test specs. Should be accurate?

ccp: 1.2 to 1.6 bar
wcp: 3.65+/-0.2 bar

System Pressure: Testing value 6.0 to 6.7 bar. If out of this range use Adjusting value 6.2 to 6.5 bar

Leak Test Min. press. after 10 min. 1.6 bar
after 20 min, 1.4 bar

I don't think this is why your car died but will probably cause cold start problems.
Your ccp (cold control pressure) looks too high. This will be too lean for cold start. Needs to be made richer, 1.2 to 1.6 bar. You should track the time it takes to go from ccp to wcp.

We will need more history of this car to help you.

Rahl
Old 12-15-2019, 09:42 AM
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There's a great "sticky" that covers all the things you should check. "Why my car won't start"
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Old 12-15-2019, 09:43 AM
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More background info would be helpful. The chassis is 1984 Carrera (Motronic), the engine 1898 930 (CIS). What fuel system do you have in place? Two pumps or one? What ignition system?
1989 CIS should include a -145 FD and -153 WUR with Lambda. Is Lambda still connected?
.
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Old 12-16-2019, 06:15 AM
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Its a modified car with a non-stock ignition system. I'll have to get a better picture as I thought my phone took the picture but did not. My WUR ends in part no 153. I have two fuel pumps which look stock. I enclosed pictures of the engine bay.
Yes, I had the car towed home and it hasnt run since.


Old 12-16-2019, 11:44 AM
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Keep posting info about yur car so we know what you have.

It hasn't run since you brought it home. I assume you tried to start it? If so did you check for spark. You can pull a sparkplug and check for spark by grounding it to the engine.

Does it run at all now that you have it home?

Rahl
Old 12-16-2019, 07:30 PM
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More info on my engine: Engine code 930/68. Engine number 68K00802.
3.3 turbo motor from 1989.
Yes, I have tried to start it. But it will not stay running. It will turn over and try to run but not matter how much gas (or less, dont want to flood) it wont stay running.
The more I try, the worse it gets and soon it just turns over but no start. Eventually the battery will die if I keep trying.


On the firewall is this Electromotive electronic ignition system


The fuel distributor.


fuel filter


fuel accumulator

I guess, the next thing I will try is check for spark at the spark plug as someone mentioned.
Old 12-17-2019, 11:36 AM
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I have run Electromotive units for 20 years. Pull the wires off the coil pak and have someone watch the coil pac. It should arc back and forth between the terminals. You could have a bad coil.
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Old 12-17-2019, 12:00 PM
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Also remember that your WUR does not seem to be functioning properly. Your cold start is not rich enough.

Rahl
Old 12-17-2019, 12:52 PM
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Quote:
Originally Posted by Porsche 935 View Post
I have run Electromotive units for 20 years. Pull the wires off the coil pak and have someone watch the coil pac. It should arc back and forth between the terminals. You could have a bad coil.
Is this done with ignition key off?
Old 12-17-2019, 02:57 PM
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Quote:
Originally Posted by 356911930 View Post
Also remember that your WUR does not seem to be functioning properly. Your cold start is not rich enough.

Rahl
Rahl,
The numbers you posted for the WUR has a different part number.
My WUR part no is 0 436 140 153
Old 12-17-2019, 03:00 PM
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My 2 cents ....Never work on the Porsche without a battery charger connected. There are too many systems that are voltage dependent.
Mine is a little older but this would work for me:
Unplug connection at rear of fuel distributor which should make both fuel pumps run.
When you are sure both pumps are running you can check fuel pressures, the car doesn't have to be running. Since you are at 59f that is about 15c so a little colder than most quoted specs.
Since it sounds like the engine fires I would continue to check the fuel system, it may just be too lean which may require a slight ccp adjustment.
If your car starts and dies but won't idle you may back out the idle adjustment screw a turn to give it more air and help it idle.
Study the "Why my car won't start" sticky as mentioned above.
Good luck!
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Old 12-18-2019, 05:56 AM
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I checked the cold control pressure for WUR part no 0 436 140 153, at 56 deg F the pressure should be 1.6 to 2.0. You are still too lean at 2.4.

I would check this again to confirm if I am right or wrong.

This and what Porsche 935 has contributed is where I would look.

Rahl
Old 12-18-2019, 12:50 PM
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How were you driving it when it died? Reason I ask is once I went WOT through 2nd and 3rd gears then lost all idle and couldn't start the car. Turns out the WOT was the last straw for a very old and cracked turbo hose under the car. The hose let in so much air that the car wouldn't start at all.
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Old 12-24-2019, 03:57 PM
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Well, after the fuel pressure testing, I checked spark from coil to check that each cylinder is getting it. All checked out with spark. I decided to put everything together. And, well, it started! I'm happy that its running but not really sure what happened? Since I didnt solve, Im a little afraid to drive it because it may happen again. I'll keep you posted what happens next!
Old 12-29-2019, 09:59 PM
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next time check for spark first

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Old 12-30-2019, 03:52 AM
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