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starting trouble (930 3,3 78)

Hello. my engine starte fine when it is cold ,and also fine when it is hot, if I start right away. but if I stop the hot, and stands in approx. 30min / 1,5 hour is very difficult to start, what can I do to solve this problem?? in 2005 got the new warm up regulator, and the engine is almost restored.

Regards john.
Old 06-06-2010, 07:59 AM
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sudo apt-get purge 930
 
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Search for fuel accumulator. Very common problem.
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Mark 1979 930 Euro ***GONE AND DON'T MISS IT AT ALL***

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Old 06-06-2010, 08:21 AM
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Quote:
Originally Posted by jeos View Post
Hello. my engine starte fine when it is cold ,and also fine when it is hot, if I start right away. but if I stop the hot, and stands in approx. 30min / 1,5 hour is very difficult to start, what can I do to solve this problem?? in 2005 got the new warm up regulator, and the engine is almost restored.

Regards john.
I had exactly the same problem and it was the fuel pressure accumulator
Old 06-06-2010, 08:55 AM
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Try cracking or pumping the throttle when starting the car. This will should help you get it started.
What happens when the accumulator fails is that fuel pressure does not hold when the car is turned off can cause longer starts when cold and vapor lock when hot.
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'78 911SC Widebody, 930 engine, 915 Tranny, K27, SC Cams, RL8 Headers & GT3 Muffler. 350whp @ 0.75bar
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Old 06-06-2010, 02:13 PM
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How do I check that it works as it should (fuel pressure accumulator) ??
Old 06-07-2010, 08:19 AM
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The 930 accumulator has a port on the bottom that is hooked to the recycle fuel line. When the diaphragm in the accumulator fails fuel will pool in the bottom. Remove this line and see if there is any fuel there.
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'78 911SC Widebody, 930 engine, 915 Tranny, K27, SC Cams, RL8 Headers & GT3 Muffler. 350whp @ 0.75bar
Brian B. (256)536-9977 Service@MKExhaust Brian@RarlyL8
Old 06-07-2010, 11:04 AM
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??

Last edited by jeos; 06-07-2010 at 12:13 PM..
Old 06-07-2010, 12:08 PM
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Quote:
Originally Posted by RarlyL8 View Post
The 930 accumulator has a port on the bottom that is hooked to the recycle fuel line. When the diaphragm in the accumulator fails fuel will pool in the bottom. Remove this line and see if there is any fuel there.
Is it when the engine has just been stardet or with cold engine??
Old 06-07-2010, 12:10 PM
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sudo apt-get purge 930
 
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Cold engine, you don't want fuel coming out on a hot engine!
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Mark 1979 930 Euro ***GONE AND DON'T MISS IT AT ALL***

"Worrying about depreciation on your car and keeping mileage down is like not ****ing your girlfriend so her next boyfriend finds her more appealing"
--clutch-monkey
Old 06-07-2010, 12:17 PM
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fuel pump must surely assets before or during the test?
Old 06-07-2010, 12:31 PM
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Nope, you're simply looking to see if any fuel has leaked past the diaphragm into the bottom of the accumulator.
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Mark 1979 930 Euro ***GONE AND DON'T MISS IT AT ALL***

"Worrying about depreciation on your car and keeping mileage down is like not ****ing your girlfriend so her next boyfriend finds her more appealing"
--clutch-monkey
Old 06-07-2010, 12:46 PM
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Now I have disconnected hose and gasoline runs out of the bottom so I will buy a new mount. in has been very helpful thank you.

Regards john
Old 06-07-2010, 01:42 PM
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Hello. I came to speak with a porsche mechanic and he claimed that there will always be fuel in the bottom due to return and maybe he's right. what do you say in that? fuel pump must do four bar but the pressure must be accumulated between bumping and motor or pressure disappears after a while when the engine is stopped?
Old 06-10-2010, 03:01 AM
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A real-time test requires plugging the return line. More safe method is to put a CIS fuel pressure gage on the system and time the pressure bleed. The system should hold residual pressure. If not then the accumulator or pump check valve is likely source of bleed.
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RarlyL8 Motorsports / M&K Exhaust - 911/930 Exhaust Systems, Turbos, TiAL, CIS Mods/Rebuilds
'78 911SC Widebody, 930 engine, 915 Tranny, K27, SC Cams, RL8 Headers & GT3 Muffler. 350whp @ 0.75bar
Brian B. (256)536-9977 Service@MKExhaust Brian@RarlyL8
Old 06-10-2010, 05:17 AM
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Hello. Now I have measured fuel pressure.( running 6.5 bar)- (stop 2.0 )-(after 10 min. 1.6 )(after 20 min. 1.3)- (and after 40 min. 0 bar). Is it as it should be?
Old 06-10-2010, 07:37 AM
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now I have pressure tested fuel accumulator and it is fine it has also gained a new pump valve . I think it is (cis) to leak inside where believe in it can be?
Old 06-10-2010, 11:22 AM
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I have now found out a cold start valve which opens after about 40 minutes I think it is too soon so maybe the engine drowns what do you think ??
Old 06-11-2010, 02:14 AM
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there must surely be someone who knows something about this time (40 minutes) I can not find information anywhere about it.

best regards, john
Old 06-11-2010, 10:36 AM
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Activation of the CSV is not time dependent but rather temperature dependent via the TTS (thermo time switch).
Your problem as I understand it is heat soak related; starts good cold and hot but not hot + time.
You have no residual pressure after 40 minutes. Your hot start problem begins at 30 minutes into heat soak.
I would still swap out the accumulator. If it is original it should have been replaced by now anyway during the course of scheduled maintenance.
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RarlyL8 Motorsports / M&K Exhaust - 911/930 Exhaust Systems, Turbos, TiAL, CIS Mods/Rebuilds
'78 911SC Widebody, 930 engine, 915 Tranny, K27, SC Cams, RL8 Headers & GT3 Muffler. 350whp @ 0.75bar
Brian B. (256)536-9977 Service@MKExhaust Brian@RarlyL8
Old 06-11-2010, 01:17 PM
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