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PorscheMoparLiterbike
Join Date: May 2010
Location: up and down the east coast
Posts: 179
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Rpm switch problem car won’t start
Hi guys I’m kind of stuck
New RPM switch part of a kit with Leask WUR All wired per instructions verified connections with MM..Power to solenoid check power to RPM switch check ground check Car cranks fires stumbles tach jumps up to 7000 RPM and back...will not run Disconnect white signal wire from the switch to black and Violet tach signal from CDI car starts normally runs normally Disconnect ground from RPM switch car starts normally tach doesn’t work(white wire connected to black violet) Since I had black violet wire exposed checked voltage to ground with ignition on ...six-ish volts not sure if this is significant normal etc. Any ideas |
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04-24-2020, 02:42 PM
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Sorry I can’t help but I’m following- I have one in the box and was figuring on installing it once I’m back together. Is BL himself responsive?
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Ken 1986 930 2016 R1200RS |
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04-25-2020, 02:11 PM
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PorscheMoparLiterbike
Join Date: May 2010
Location: up and down the east coast
Posts: 179
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Bought the kit from Brian at rarely l8 he’s been great and both of us scratching our head after I described to him the situation.
I believe he forwarded info to BL. I believe this is something in my electrical system but just speculation at this point. Everything seems to operate normally I did end up troubleshooting the yellow relay that was letting my pumps run during ignition on .....had a spare that solved the problem. |
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04-25-2020, 02:28 PM
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PorscheMoparLiterbike
Join Date: May 2010
Location: up and down the east coast
Posts: 179
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Also thanks for chiming in Ken ... looking forward to see your build.
I’m 600 miles plus into initial break in with my engine so kind of a bummer ....didn’t want to keep dumping 10 to 1 AFR during mid range...I haven’t adjusted the WUR threshold yet so may try that as an interim Band-Aid |
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04-25-2020, 02:41 PM
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I can send you my unopened one if you want to swap it in and see if it’s the unit itself.
I’m weeks from roadworthiness... LMK
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Ken 1986 930 2016 R1200RS |
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04-25-2020, 03:04 PM
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PorscheMoparLiterbike
Join Date: May 2010
Location: up and down the east coast
Posts: 179
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Awesome thank you Ken...sent you a PM
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04-25-2020, 04:30 PM
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Replied and just saw your tools/stomski offer on my build thread. Thank you back!
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Ken 1986 930 2016 R1200RS |
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04-25-2020, 06:30 PM
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PorscheMoparLiterbike
Join Date: May 2010
Location: up and down the east coast
Posts: 179
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found this on page 3 - may confirm my 6V measurement of blk/vlt tach signal wire with ignition on
Tach not responding 
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88 930 BnB Kinesis tial 1bar k27/29, Turbokraft IC+blocks+rokr loks+ ported intake,edelweiss cams, KEP/Sachs, Verden Tool 38mm PP heads, ARP bolts/studs, twin plug for future |
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04-27-2020, 07:23 AM
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PorscheMoparLiterbike
Join Date: May 2010
Location: up and down the east coast
Posts: 179
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Tried another new rpm switch (thanks Ken!)..same behavior.
Went back to my sometimes working MSD box ...fired up normally although I didn’t test it driving. May have to go MSD route. Unfortunately no solution to the original problem with the stock CDI. |
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05-02-2020, 04:23 AM
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PorscheMoparLiterbike
Join Date: May 2010
Location: up and down the east coast
Posts: 179
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05-02-2020, 04:33 AM
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Quote:
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Steve 1981 SC Steel Widebody Outlaw in Pacific Blue and Artic White, 930/51 to 3.2l, K27 7006 Turbo, P&P Twin Plug heads, Twinfire Ignition, BLwur, Ruf Intercooler, Powerhaus headers, Zork, CIS Euro FD, 009 injectors, DOD, DP Lid, 044 pump, 930 4 sp LSD, Mocal 44 w/fan, LM2, Brembo, Retroair, Euromeisters. |
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05-02-2020, 04:51 AM
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PorscheMoparLiterbike
Join Date: May 2010
Location: up and down the east coast
Posts: 179
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Yeah I definitely was thinking about it but other priorities took over if I’m moving AC is decent sitting in traffic hot weather it goes off on high head I just open the windows. But definitely something to consider for the future
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05-02-2020, 09:06 AM
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PorscheMoparLiterbike
Join Date: May 2010
Location: up and down the east coast
Posts: 179
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Ok got rid of my German hillbilly test rig and buttoned Everything up MSD box switch solenoid good..... went for a 50 mile drive yesterday before the rain hit. Had a 4200 rpm chip...It’s working ...especially noticeable upon boost threshold car is much more responsive hi 11s AFR instead of immediately dropping to afr 10/high nines at about 3000 3300 before switch install. Appears to get richer 3500 to 4500 with a drop to low 10’s after switch opens solenoid.
Tough to watch all the gauges at once and the road...I’m going to take my youngster out for some observations...so far so good |
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05-04-2020, 04:07 AM
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So, your Leask RPM switch is working but only with the MSD CDI and not the original factory CDI box?
What do you think made the difference with the Leask RPM Switch working or not? Thanks, Rahl
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1976 930 turbo Carrera, "Ubich". Mostly stock, lightly sweetened. She’s an angry schwierigkeit. She doesn’t want flowers, she just wants to dance! And when she does, she shakes her hips to the rythem of the road. Drive her like you hate her! |
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05-04-2020, 08:43 AM
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PorscheMoparLiterbike
Join Date: May 2010
Location: up and down the east coast
Posts: 179
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Hi Rahl...that’s correct..msd6al2 yes..porsche CDI no....unfortunately I didn’t have the skill or the time to properly troubleshoot why it wouldn’t work with the stock Porsche CDI. maybe some thing with my stock box ...who knows?
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05-04-2020, 04:17 PM
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PorscheMoparLiterbike
Join Date: May 2010
Location: up and down the east coast
Posts: 179
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Just a follow up..with the switch active ..boost enrichment delayed at 4800 rpm ...the afr drops as Soon as system goes from closed loop lambda control to open loop 14+ to 10s about 3000 rpm...Starts running out of fuel 6000 RPMAFR at low 13s....Time to start thinking about EFI in the near or intermediate future
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05-15-2020, 06:28 PM
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Crotchety Old Bastard
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If the only problem is running out of fuel then the fuel distributor can be swapped out for a Euro model or modified for more flow.
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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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05-17-2020, 03:08 AM
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Registered
Join Date: Jul 2003
Location: Glorious Pac NW
Posts: 4,184
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Quote:
Quote:
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'77 S with '78 930 power and a few other things. |
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05-17-2020, 04:39 AM
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PorscheMoparLiterbike
Join Date: May 2010
Location: up and down the east coast
Posts: 179
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Appreciate your input Brian and Spuggy...this was not unexpected based on my engine build...I’m at the well traveled crossroads of mod CIS vs EFI...but have a few leaks I’m chasing...also I have some suspension stuff to take care of
 Will contemplate which way to go...Ultimate goals and use for the car....Also time and money factors |
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05-17-2020, 12:13 PM
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911 Turbo
Hot Euro (from PO)
1976 Porsche 930
78 Porsche 911SC 3.0L, 3.3Turbo soon. 
