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Join Date: Jan 2003
Location: Burlington, Wisconsin
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car dies what to look for?
ok my car is prety far from stock in the fuel and igntion catagories it has the following to give you and idea
MS ECU for the EFI 12 plug dizzy customer curved for my application msd 6al msd twin coils and most the orginal harness is gone from the cis etc. When driving the car it runs well but yesterday while cruising the car @3000rpm the car just died. I looked to make sure all the power was still on and it was. as soon as I hit the key to restart it fired right up.. I tend to think it was just the stock fuel pump relay but how often do they really go bad? I am thinking ECU issues ![]()
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Ben 914-6 2.4s GT tribute. 914-6werkshop.com manufacturer of 914-6, GT, Conversion parts |
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Join Date: Dec 2001
Location: MA USA
Posts: 2,938
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I would guess a wiring problem. Most ECUs are very reliable. All it takes if one bad connection and your car dies. I would try to eliminate things. Can you hook up a laptop while driving to see if the ECU looses power? You could make up a test light for fuel pump power and see if the light goes out when you car dies.
Good luck
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Dean 911 SC turbo, 3.0L 930 motor, G50, 930 brakes, DTA EFI, 352 RWHP DynoDynamic dyno, |
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You always have to at least consider the voltage regulator making power spikes happen...
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Don't forget about ALL the ground wires. Many more in these EFI systems.
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sudo apt-get purge 930
Join Date: Jul 2006
Location: Brandon, FL
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Mine was doing that and it turned out to be the red over boost relay in the back. Replaced it and problem is long gone. Relays do go bad.
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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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it did it to me once last year right before I put it away. I figured it was a fluke. So I rewired to clean up everything back there and got really good grounds. etc. I am hoping upon all hope that it is just the fuel pump relay but could be voltage spikes as well..
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Ben 914-6 2.4s GT tribute. 914-6werkshop.com manufacturer of 914-6, GT, Conversion parts |
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I swapped a 3.2L from a roll over into a '71. Had start and run issues then finally found a corroded/intermittent ground in the engine harness. Lots of them with Motronic.
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I read some of the guys run filters on the main power to the MS or any ECU for that matter to prevent V spikes. Maybe worth a shot
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Ben 914-6 2.4s GT tribute. 914-6werkshop.com manufacturer of 914-6, GT, Conversion parts |
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930s rule the wasteland
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possible ignition switch
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1980 930 Turbo 1993 Corrado 1983 944 1984 944 2001 VW golf TDI |
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Ben, is your motor still Motronic with crank speed and position sensors?
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thats new
as to what eninge it is an 81sc engine base with 3.2 intake and 98mm 8-1 turbo pistons(je) running MS as the fueling ECU running an 12 plug dizzy for ignition.. I fire two coils with 1 MSD.. I just drove it again and did it once for me. it started right back up as soon as I cranked it
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Ben 914-6 2.4s GT tribute. 914-6werkshop.com manufacturer of 914-6, GT, Conversion parts |
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Porschaholic
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Fuel pump relay BINGO... my car was doing the same thing and once replaced, problem solved.
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Im wondering if the MSD is having a fiesta at your expense...
Ive had intermittent problems with my old 6al before.
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Kris @ Tech9 86' 930/GT-40R Sold ![]() 94' Rustang GT daily (long gone) 2008 C6/Z51 Corvette |
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Crotchety Old Bastard
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Don't discount the ignition switch. They commonly go bad with age as the connections simply wear out. Sometimes just wiggling the key with the car running will reveal the issue.
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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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I have often suspected it but kind of a somewhat expensive trial and error thing
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Quote:
replaced it last year with a new one.. oh and put a different relay in for the fuel pump with no luck ![]()
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As your set up is pretty custom, do you have an overboost switch built in. I know this topic has been brought up a lot, but the overboost will cut the fuel pumps, and if you have a short in there somewhere it may be bad enough for the car to stall.
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No it does not. But It seems very ignition related as it is very pronounced when it dies like key switch vs fuel would be a little bit slower I would think
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Ben 914-6 2.4s GT tribute. 914-6werkshop.com manufacturer of 914-6, GT, Conversion parts |
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well you need`d a fuel pressure gauge anyhow
![]() PS_pics of the car?
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Quote:
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