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Where is roll-over valve located on 79 930?

Where is roll-over valve located on 79 930? Thanks
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Old 03-01-2007, 03:44 PM
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Are you talking about a valve in the fuel line or a switch?
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1979 930 (475 rwhp at 0.95 bar)
Old 03-02-2007, 03:24 AM
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the switch

the switch
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AMG V8 SL55 Mercedes, 993 C2, 86' Carrera 3.6 hot rod, Purple 1998 993 that didn't make the cut, 3 very old 930s, A/Fuel Dragster CH3NO2 (R.I.P.), Blown Alcohol TAD, AA/AA, 360 Maxim wingless, Cummins Turbo Diesel. Amateur Welder, Painter and sculptor sort of. -
Old 03-02-2007, 03:26 AM
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I don't believe there is a roll over switch and I've spent many hours looking at the wiring diagram. Are you having a specific problem?
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Old 03-02-2007, 04:51 AM
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problem

1979 930. Pretty fresh engine/electrical throughout. Not old used up and fagged out piece. Stalled at stop sign today. Key off then key on to start and car fires up. Count to four and car stalls. Key off, key on to start - cranks but no fire. Same procedure a few times more. Finally wiggle relays - I can hear them working. Car now starts again, but count to four and it stalls (still not in gear). Wiggle WUR wire out of desperation - look for anything out of sorts. See nothing. Try to fire again and it does. Drives 5 miles to home and seems trouble free.

It has been suggested that roll over valve switch may be bad. Also suggested to run small ground wire from #85 pin on red fuel pump relays to assure best contact. Also to check time delay switch (Where is it?)
EPS
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Old 03-02-2007, 05:14 AM
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The only delay switch I know of is the delay relay to the CDI. It's the square relay by the engine fuse box. I don't have any ideas on what it could be, but it does sound electrical. I emailed you something that might help.
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Last edited by David; 03-02-2007 at 06:11 AM..
Old 03-02-2007, 06:06 AM
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Does it still have a stock intercooler? I had this problem once after installing an after market I/C. It was a grounding issue with the I/C and the engine. The overboost switch mounted on the intercooler was cutting out due to bad grounding. I also noticed that it would run fine for a while, but cut out under boost caused by improper mounting of the I/C - the pressure in I/C piping openned the ground connection for the same switch.
One way to quckly check this is to gound the overboost switch by connecting the wire from the overboost switch to ground and try to see if things are ok).
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Old 03-02-2007, 06:22 AM
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By-pass fuel pump relays sometimes front pump does not properley work on start up( happened to me ) I removed front pump cover and used my english car wrench ( hammer ) to tap pump and it started pumping twice as fast. I then tested my pump finding out it was on it's last legs . I replaced both pumps with one aftermarket pump no more power and stall issues. If it happens on start up the pumps contacts are starting to go. It's worth the $ 300.00 for a new heavier duty pump vs. a tow.
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Old 03-05-2007, 03:19 AM
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pump replacement

Stephen: Curious to know brand and source for single replacement pump.
Cheers - EPS
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Old 03-05-2007, 10:56 AM
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www.sx-performance.com part # 18203 good for 45 p.s.i. up to 1200 h.p. Where the 2nd pump was I installed a electronic fuel pressure sender and I have a fuel pressure/a.f.r/boost gauge shift light pod on left drivers pillar . Works great most important gauge under boost is fuel pressure !
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Old 03-05-2007, 01:02 PM
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