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924S No Start (New DME, ECU & REFF Sensors)
Hi, I have a 1987 924S.
I have done many tests and replaced many parts to no avail. Any ideas or any input would be very helpful. Thank you. |
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12-04-2016, 02:21 PM
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In the Fires of Hell.....
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List out in as much detail as you can what you have done already. Without that, everyone is shooting in the dark.
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PCA Instructor: '88 951S - with LBE, Guru chips, 3Bar FPR, 1.3mm shimmed WG, 3120 lbs, 256 RWHP, 15 psig boost |
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12-04-2016, 05:34 PM
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Registered User
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New DME, new ECU, new reference sensors, checked inside of distributor, pulled spark plug, checked for spark, fuel pressure fuel pump flowing, tested fuse panel. Cranks, but does not fire. Smell of Fuel present from tailpipe when cranking.
Please advise. I don't believe the timing belt has been done or is out of sync. Thank you. |
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12-04-2016, 05:49 PM
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Registered
Join Date: Oct 2002
Location: Boulder, CO
Posts: 1,206
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The DME *relay* is a more common problem than the DME itself. Also some of the cheapo new DME relays have been faulty from the get-go. For troubleshooting the jumper wire shown in clarks-garage is a reliable substitute.
Do you have a spark checker or other good way to test for a strong spark? It has to be able to jump around 10mm in the open air. -Joel.
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1987 928S4 1992 968 cabrio 2009 957 Cayenne GTS |
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12-04-2016, 07:44 PM
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Registered
Join Date: Feb 2003
Location: SF East Bay
Posts: 1,856
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Have you checked that the speed/ref connectors aren't reversed?
When you pulled plug and checked for spark, was there spark? What colour was spark. Measure supply voltage at coil Measure supply voltage at injectors Measure impedance of speed/ref sensors Measure peak-to-peak voltages of output waveforms from speed/ref sensors ('scope needed). 
Last edited by DannoXYZ; 12-04-2016 at 09:37 PM.. |
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12-04-2016, 09:33 PM
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Registered
Join Date: Jul 2004
Location: Upstate New York
Posts: 3,279
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I offer you $200 for your 924S as it sits...
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Good luck, George Beuselinck |
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12-05-2016, 11:39 AM
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Registered
Join Date: Feb 2003
Location: SF East Bay
Posts: 1,856
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George, you vulture !!!
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12-05-2016, 11:59 AM
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Registered User
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Hold please will try to get another test tonight.
Lodi Ca Craigslist has a early 924 for cheap. My new Ecu was $300, I think will keep working away. Thank you. |
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12-05-2016, 03:33 PM
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Registered
Join Date: Feb 2003
Location: SF East Bay
Posts: 1,856
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Note that your 924S is a 944 in 924 body. Early 924 and 924-S is VW and is not the same car.
Efficient troubleshooting (least amount of time & money) requires measuring parts and coming up with NUMBERS. Then comparing those numbers with what's listed in FSM will point out if a part is good or bad. Without the numbers, you're throwing random darts hoping something will stick. You're replacing perfectly good parts with new ones and nothing changes. Download the "DME test plan" and do the tests in order (ignore KLR tests for Turbo). You're just one step away from getting it running! Keep on going, you'll find it! |
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12-06-2016, 12:11 PM
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Registered User
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I made several tests before buying parts. It's relatively cheap compared to working on my 1985 911. I have a 1977 924, very different from the S. Please hold I have not got to test further. Ty.
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12-06-2016, 02:08 PM
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944 Turbo
