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Notices Follow Rennlist on Facebook for News and Forum Updates 924/931/944/951/968 Forum Porsche 924, 924S, 931, 944, 944S, 944S2, 951, and 968 discussion, how-to guides, and technical help. (1976-1995) Sponsored by: Community Links Social Groups Pictures & Albums Users List Search Forums Show Threads Show Posts Tag Search Advanced Search Find All Liked Posts Go to Page... 944 Turbo no Spark Reply Subscribe Thread Tools Search this Thread Jun 23, 2017 | 12:57 AM Share Share Options #1 ekmxryda Thread Starter AutoX Joined: Jun 2017 Posts: 11 Likes: 0 From: North Shore Mass 944 Turbo no Spark Looking for help with thoughts to get this 68,000 mile very clean, no rust, no water damage, 1988 951 Silver Rose back on the road after previous owner left in garage for ten years. Have been reading posts on Rennlist for the last month and it has been very helpful. Also ran a bunch of tests from Clark's Garage. Went through fuel system first, drained tank and cleaned pick up screen, replaced line to fuel pump, fuel filter, and blew out lines. Sent fuel injectors out to be cleaned and flow tested, checked line pressure at 36 lbs and leakdown test held well. New battery, spark plugs, checked cap and rotor plus the set screw and they look ok. Turns over fine but no spark. Checked grounds, all fuses and relays. DME relay is fine with proper voltage at pin 30 and 86, 12V at injectors. Was getting tach bounce while cranking over but after reading a bunch of posts on bad speed and reference sensors I went ahead and replaced them. Have 12V at Coil positive and negative posts, still wasn't seeing output from Coil. New Coil installed acts the same. Checked DME plug and pin 4 (start signal) is only 10.5 V while cranking. 12 V on pin 1 (ignition pulse to coil), and pin 18. The car had a Clifford alarm at one point but I cant find any signs of it now. Factory alarm relay G18 was missing from the fuse box. If it was an alarm issue would I be getting 12 V at the pin 4 on DME plug? I am wondering if it is a bad DME? Or just a break in the harness somewhere, I am not the best at electrical troubleshooting so forgive me if I have missed something obvious. Any other quick tests I could run before sending off DME for service? Thanks, Eric Reply 0 0 ekmxryda View Public Profile Find More Posts by ekmxryda Jun 23, 2017 | 10:13 AM Share Share Options #2 Jfrahm AddictRennlist Member Joined: Mar 2002 Posts: 6,873 Likes: 206 From: Boulder, CO This thread might help. https://rennlist.com/forums/944-turb...989-951-a.html Otherwise where are you located? Maybe someone nearby has a spare DME/KLR Reply 0 0 Jfrahm View Public Profile Find More Posts by Jfrahm Jun 23, 2017 | 11:44 AM Share Share Options #3 ekmxryda Thread Starter AutoX Joined: Jun 2017 Posts: 11 Likes: 0 From: North Shore Mass Thanks Joel, I will check out that alarm bypass. I am just north of Boston Mass if anyone has a spare DME / KLR to try out. Reply 0 0 ekmxryda View Public Profile Find More Posts by ekmxryda Jun 23, 2017 | 03:31 PM Share Share Options #4 GPA951s Three Wheelin' Joined: Dec 2016 Posts: 1,962 Likes: 275 From: Outskirts of Buffalo NY There also could be a problem with the airbag module, The power is sent Through the airbag module so In the event of deployment it shuts the car down, To test, unplug the big round connector and jump pins 3 and 4.. Might be worth a try... Reply 0 0 GPA951s View Public Profile Find More Posts by GPA951s Jun 24, 2017 | 12:45 AM Share Share Options #5 ekmxryda Thread Starter AutoX Joined: Jun 2017 Posts: 11 Likes: 0 From: North Shore Mass Ok good to know, I can check the airbag module tomorrow thanks. Reply 0 0 ekmxryda View Public Profile Find More Posts by ekmxryda Jun 27, 2017 | 02:40 PM Share Share Options #6 ECU Doctors Former Vendor Joined: Dec 2009 Posts: 268 Likes: 17 From: Fort Lauderdale ekmxryda Any luck with this yet? Is there fuel pressure in the lines? Do you have injection at least? Reply 0 0 ECU Doctors View Public Profile Visit ECU Doctors's homepage! Find More Posts by ECU Doctors Jun 27, 2017 | 03:31 PM Share Share Options #7 ekmxryda Thread Starter AutoX Joined: Jun 2017 Posts: 11 Likes: 0 From: North Shore Mass Hi I do have good fuel pressure 36lbs and leakdown test held. Sent injectors out for cleaning and flow test, have 12 V at injectors. I have not had a chance to work on the car, hope to this week. Need to rope in some help somehow, feeling lost. Thanks, Eric Reply 0 0

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ekmxryda View Public Profile Find More Posts by ekmxryda Jun 27, 2017 | 04:01 PM Share Share Options #8 ECU Doctors Former Vendor Joined: Dec 2009 Posts: 268 Likes: 17 From: Fort Lauderdale Ok so fuel pump is good. Can you confirm that you have injector pulse? Can you smell fuel after cranking the car? Is yes, then your sensors are fine, but 1 of the 2 Control units (DME or the KLR) is not working properly. Reply 0 0 ECU Doctors View Public Profile Visit ECU Doctors's homepage! Find More Posts by ECU Doctors Jun 27, 2017 | 05:17 PM Share Share Options #9 ekmxryda Thread Starter AutoX Joined: Jun 2017 Posts: 11 Likes: 0 From: North Shore Mass Yep smell fuel after cranking over. Could just be a leak though! Friend said he would let me borrow his Noid light set to test to make sure they are firing. Along the same lines as the Airbag Module, just was wondering if a bad Turbo water pump relay could keep the DME from firing? Reply 0 0 ekmxryda View Public Profile Find More Posts by ekmxryda Jun 27, 2017 | 06:30 PM Share Share Options #10 ECU Doctors Former Vendor Joined: Dec 2009 Posts: 268 Likes: 17 From: Fort Lauderdale No it wouldn't keep if from running as far as I know. The noid light test results will be great info once you have it. Reply 0 0 ECU Doctors View Public Profile Visit ECU Doctors's homepage! Find More Posts by ECU Doctors Jun 28, 2017 | 11:03 AM Share Share Options #11 PerryB Instructor Joined: Apr 2014 Posts: 236 Likes: 10 From: Creede, CO ekmxryda, When you replaced the speed and reference sensors, what brand did you use? Reply 0 0 PerryB View Public Profile Find More Posts by PerryB Jun 28, 2017 | 02:30 PM Share Share Options #12 GPA951s Three Wheelin' Joined: Dec 2016 Posts: 1,962 Likes: 275 From: Outskirts of Buffalo NY Are the ref sensors Gapped Correctly? Were they done one at a time? connectors switched.. ? Reply 0 0 GPA951s View Public Profile Find More Posts by GPA951s Jul 9, 2017 | 03:06 PM Share Share Options #13 ekmxryda Thread Starter AutoX Joined: Jun 2017 Posts: 11 Likes: 0 From: North Shore Mass Hey guys, Used FAE sensors, made sure to mark connectors so I wouldn't swap them by mistake. Wiring was good, checked pins on DME plug. Used same spacer that was there so gap should be good. New coil checks out ok, followed Clark's coil test procedure. No voltage out of coil when cranking. Injectors firing. Pretty sure I have checked all the grounds? Have not looked at the Air Bag Module yet. Looking for that info... http://www.paragon-products.com/Pors...606.115.00.htm Reply 0 0 ekmxryda View Public Profile Find More Posts by ekmxryda Jul 10, 2017 | 10:28 AM Share Share Options #14 Jfrahm AddictRennlist Member Joined: Mar 2002 Posts: 6,873 Likes: 206 From: Boulder, CO I doubt if the airbag module shut things down it'd allow the injector pulse. Here is a KLR bypass thread: https://rennlist.com/forums/944-turb...lr-bypass.html Some pretty good troubleshooting here too: http://forums.pelicanparts.com/porsc...r-problem.html ...also verifies jumpering the pins to run w/o a KLR. -Joel. Reply 0 0 Jfrahm View Public Profile Find More Posts by Jfrahm Jul 10, 2017 | 11:17 AM Share Share Options #15 ekmxryda Thread Starter AutoX Joined: Jun 2017 Posts: 11 Likes: 0 From: North Shore Mass Hi Joel, Thanks for the links I will check them out, more great info! Reply 0 0 ekmxryda View Public Profile Find More Posts by ekmxryda Thread Tools Show Printable Version Search this Thread Advanced Search Thread Tools Show Printable Version Email this Page Advanced Search User Control Panel Private Messages Subscriptions Who's Online Search Forums Forums Home Rennlist Help and Welcome Sections New Member Welcome Area Rennlist Forum Glitches - post them here. Test posts are permitted. 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