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steven c's Avatar
 
Join Date: Jul 2008
Location: Dallas, TX
Posts: 207
Ignition relay ticking

On my 91 965 after running the motor to full warm then shutting down the engine the ignition relay in the engine compartment ticks like a clock for 20 mins up to not stopping until I disconnect the battery or pull the relay. Most times when it cools down it stops?

Tried a new realy, same thing. Tracing the wires to it it looks like it gets its signal from the turbo control module. Any thoughts on this? Doesn't look repairable? Thanks
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Steve
91 964 turbo
63 SWC Vette Race Car since 1966
69 Vette Race Car since 1971
07 Z06 DD
Old 06-05-2010, 08:39 AM
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In Adrian's 964 book the relay that is ticking is the ignition delay relay. What controls this?
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Steve
91 964 turbo
63 SWC Vette Race Car since 1966
69 Vette Race Car since 1971
07 Z06 DD
Old 06-05-2010, 09:49 AM
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Thanks Mark! What I suspected...not repairable. Anyone have a spare turbo control unit?
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Steve
91 964 turbo
63 SWC Vette Race Car since 1966
69 Vette Race Car since 1971
07 Z06 DD
Old 06-05-2010, 06:13 PM
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Sorry,
I wanted to include a picture so I had to remove my "quick" reply.


I checked my 1991 965 schematics and it shows the ignition delay relay coil is powered from the battery through the central electrics panel (fuse panel). There are no switches, relays, fuses, or sensors in this circuit. The relay has +12v all the time. You can check this by removing the relay and connecting a voltmeter between the relay terminals 2 or 3 (they are jumpered) and ground.

The ground side of the coil is connected directly to pin 8 of the Turbocharger Control Unit under the driver's seat (P/N 965-618-130-00). The connector may be loose and causing this issue.

Your relay should be energized when the key is in the "on" position and de-energized 5 seconds after the key is turned to the "off" position to burn off any remaining fuel in the cylinders that may have some fuel vapor left over when the engine was switched off.

I would begin by checking the connections and if they are good, you may have a faulty Turbocharger Control Unit.

One more thing, on my car the wire connecting the battery to the ignition delay relay under the central electrics panel burnt through because it was supposed to be a red 4.0mm wire and it was a .5mm wire. Yes, Porsche made a mistake in the wiring harness. Turn your fuse panel over and look for a thin burnt wire in the vicinity of "Black" coded connector. I have attached a "before" picture. If you need info on how to repair this PM me. (The burnt wire is just below the center of the picture and the red color looks brown.

Mark
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1991 964 Polar Silver Metallic Turbo Coupe
Old 06-05-2010, 06:19 PM
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Well no burnt wire...so I am checking power next at the relay?
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Steve
91 964 turbo
63 SWC Vette Race Car since 1966
69 Vette Race Car since 1971
07 Z06 DD
Old 06-06-2010, 10:57 AM
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Gotta Jibboo
 
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I replied on Rennlist as well, but if it is your Turbo Control Unit that you think is bad, let me know, I have one that still works, but clicked every once in a while. I'd be open to shipping it to you if you promised to ship it back after testing in your car. You don't want to have to buy one if you don't need it, as they are about $700.

Bill
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2003 996TT
1992 964 Turbo (sold) Holy crap are these expensive now!
1986 911 Cabriolet (sold)

I don't know why I do the hillbilly things I do.
Old 06-06-2010, 09:06 PM
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Thanks Bill! I think I have one to use but if not I will take you up on the offer.
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Steve
91 964 turbo
63 SWC Vette Race Car since 1966
69 Vette Race Car since 1971
07 Z06 DD
Old 06-07-2010, 04:19 AM
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