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Join Date: Jul 2009
Posts: 140
CDI does not want to turn off continously buzzing, humming

Hi fellow pelican members,

My CDI does not want to turn off even if the ignition & engine has been shut off. the CDi continously hums /buzz. The only way to turn it off is to detach the negative cable of the Battery. When the negatve cable is reattached to the negative pole of the battery the CDI does not buzz/hum. Only when the ignition is switched on and the engine is started. When I shut down the engine there continous buzzing /humming of the CDI.
The car is an 89 911 turbo coupe USA car.


Thanks in advice guys,


tdh888

Old 12-13-2014, 01:01 AM
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Crotchety Old Bastard
 
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Join Date: Jan 2000
Location: Huntsville, AL
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There is a timer on the CDI that allows it to run for a few seconds after the key is turned off. It sounds like that relay is sticking. There is a thread in the archives about the run-on relay and how to bypass or replace it. Jim Fairman posted a picture I believe.

Here is one:
Delayed Ignition Cut-Off Relay

Here is the one I was thinking of:
CDI help....PLEASE..before i sell the damn car

.
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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

Last edited by RarlyL8; 12-13-2014 at 06:21 AM..
Old 12-13-2014, 06:12 AM
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Location: Stockholm, Sweden
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Had the same problem a couple of years ago, it was the Delayed ign cut off relay.
Old 12-13-2014, 11:12 AM
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Thanks guys for the reply , i will ask my tech to check out the the delayed ignition cut off relay.

930
Old 12-13-2014, 12:16 PM
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Hi ,

Is this right part no. Of the ignition cut off relay 930 617 112 02 that I need for my car. If its not can someone please help me find the proper part no.

Thanks a lot guys,

tdh 888
Old 12-13-2014, 01:01 PM
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Hi guys,

Thanks to all of you who replied. It was indeed the Ignition Cut Off Relay w/c was the culprit. Brought the CDI & the Ignition Cut Off relay to my electronic tech whose expertise is repairing High End tube & solid state Hi Fi equipment.He checked them both .No problem w/ the CDI. The Ignition Cut Off Relay's diode was the culprit. He replaced both transistor (since its available) and diode w/ the same brand as the original parts . My mechanic installed it this morning and it works perfectly. It cost me less than $30 for parts & labor.

tdh888

Old 12-22-2014, 10:21 PM
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