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Registered
Join Date: Feb 2002
Location: Planet earth
Posts: 867
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Turbo guys..could use your help here....
Little back ground first...
'91 964 Turbo 34K miles and just had valves adjusted by a Porsche master mech few months ago... Today was the first time i took the car out to the back roads here in KY and had fun making few 6000 rpm pulls.It was right after that,while driving at 70 mph,all of a sudden i noticed my RPM tach started wondering up and down so i immediatly pulled over.I never felt any noise,tapping,smoke or any other unusual stuff.. Car would crank but won't start.. 1)-so where do i look for loose hoses... 2)-Could bad valve adjutment account for this problem.. 3)-Would taking the valve covers off,make the oil spill out and how much oil are we talking here.. 4)-To check for compression,what's the easiet access to the spark plugs..My friend tells me,he can access the plugs through the fenders after taking the wheels off...Does that sound OK. 5)-Is some one kind enough to PM me their tele number to call should we run into problems . Any other suggetions.. Thanks Yasir |
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04-18-2009, 07:53 PM
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E-85 sippin drunk
Join Date: Jan 2002
Location: Warner Robins, GA
Posts: 1,554
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If the tach is bouncing all over the place...then you have an electrical issue.... There probably is nothing wrong internally with your engine. I am not sure, but does the C-2 Turbos have a CDI box? (permatune box) ... I would check all of the grounds, and make sure you are getting a spark at the coil. If not, then you have found your problem..
by the way, the wife and I drove my car up to Berea and Shaker village one year... LOVED the curvy country roads...
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Brad...930 gt-1 racecar, increased displacement to 3.6L, JB racing Cylinders, JE 8 to1 pistons, stroked crank, Carrillo rods, extrudehoned 3.2L intake, full bay Bell I/C, GT-2 EVO cams, Rarly8 headers, GTX-3584RS turbo, twin plug, P&P heads, Link G4 EFi system, G-50/50 with LTD slip and oil squirters/oil cooler, zork tube, full race coilover system, with carbon fiber body, full cage, E-85 sippin drunk Last edited by turbobrat930; 04-18-2009 at 08:03 PM.. |
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04-18-2009, 08:01 PM
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Crotchety Old Bastard
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Yes tach bounce followed by stranded on the side of the road is typical elecrical problem. Could be many things with the C2T as they are much more burdened with elecrtonics than the earlier 930.
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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 |
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04-18-2009, 08:10 PM
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sudo apt-get purge 930
Join Date: Jul 2006
Location: Brandon, FL
Posts: 4,838
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Quote:
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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 |
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04-18-2009, 08:14 PM
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Registered
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Thanks for the replies guys...However
1)-Any suggestions to look for common electrical problem areas.. 2)- Would taking valve covers spill the oil ? Thanks |
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04-19-2009, 06:12 AM
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Registered
Join Date: Jul 2007
Location: Taoos New Mexico
Posts: 661
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Check the green wire on the dizzy and yes you will spill some oil.
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04-19-2009, 07:00 AM
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Registered
Join Date: Mar 2006
Location: Elk Grove, CA
Posts: 513
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I had my tach bouncing all over the place and ended up being he alternator went bad. Replaced it and solved the problem.
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1987 factory Slantnosed 930 Cabriolet/Guard's red 2002 Midnight Blue 996TT X50 1999 Iris Blue 996 (Dash fire burned and totalled 9/07) |
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04-19-2009, 07:03 AM
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Crotchety Old Bastard
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Alternator could be culprit but you say the car cranked. If the alternator fails the battery will not charge then could not crank starter. If the aternator has a short it may crank but not start.
You need a wiring schematic to see what powers what in series.
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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 |
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04-19-2009, 07:13 AM
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Moderator
Join Date: Aug 2002
Location: OverlandPark KS (Kansas City)
Posts: 526
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Yes, check the voltage first. Two things can happen. One is the car is low on voltage. Anytime you start your car it takes 45 minutes of continuous driving to replenish what it took the car to start with. SOOOOO if you have a low battery and you start it and do a few short trips then you are really straining the system.
The other thing is the alternator could be going out. Take a volt meter and run the car to 2K (with someone’s help) check the voltage at the battery, it should be at 14 volts. Lastly, the diodes in the alternator can go out one by one causing massive dirty signals coming out of the system and the tach is sensitive to that voltage spike if you will. If this is the case everything will still work (for a while) but needs to be replaced and or rebuilt. FWIW the 91-94 Turbos didn't use the hall sensor in the dizzy, it was a hybrid of ignitions from the 3.2 and the 944/928 and used a ref sensor on the flywheel.
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Stephen 94 3.6Turbo 6-speed AWD |
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04-19-2009, 07:13 AM
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Registered
Join Date: Nov 2003
Location: BABYLON,N.Y.
Posts: 1,048
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tach bounce
tach bounce is bad voltage regulator..usually
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04-19-2009, 07:15 AM
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Registered
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Voltage is fine but no spark at the plugs ? Any suggetions where to look for the problem...
Thanks |
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04-19-2009, 10:44 AM
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After the next project
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Could be
Coil... If no spark, then coil could be going bad. Do you have another 930 around? You could borrow to check. Or it could be as simple as rotor or possibly CDI box.
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04-19-2009, 10:54 AM
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Registered
Join Date: Aug 2007
Location: Austin
Posts: 584
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fly wheel sensor unplugged ? no signal from fly wheel = no spark
on mine the female side deteriorated and the connection fell apart I held it together with a zip tie untill replaced it is on the top drivers side of the motor it has a metal holder |
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04-19-2009, 11:00 AM
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Registered
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Checking all that...Will get back to you guys in few minutes..
Thanks |
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04-19-2009, 11:12 AM
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Registered
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Quote:
Thanks to every one... Last edited by yasir; 04-19-2009 at 07:26 PM.. |
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04-19-2009, 11:22 AM
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E-85 sippin drunk
Join Date: Jan 2002
Location: Warner Robins, GA
Posts: 1,554
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Very good, glad you found your problem!!!!
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Brad...930 gt-1 racecar, increased displacement to 3.6L, JB racing Cylinders, JE 8 to1 pistons, stroked crank, Carrillo rods, extrudehoned 3.2L intake, full bay Bell I/C, GT-2 EVO cams, Rarly8 headers, GTX-3584RS turbo, twin plug, P&P heads, Link G4 EFi system, G-50/50 with LTD slip and oil squirters/oil cooler, zork tube, full race coilover system, with carbon fiber body, full cage, E-85 sippin drunk |
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04-19-2009, 11:27 AM
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Nice call, Black_Hat!
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Scott - 1987 930: 3.45L Supertec engine w/GT3 crank, California Motor Sports upgraded 930 trans, modified suspension, Zuffenhaus 9's and 11's, black on black..."The Black (Financial) Hole" 
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04-22-2009, 06:12 AM
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78 Porsche 911SC 3.0L, 3.3Turbo soon. 
Blacked 930, Fresno CA
