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Old 03-06-2002, 07:54 PM
Registered User
Join Date: Jan 2002
Posts: 177
My ignition coil is ticking

I just quited my noisey valve train with a valve adjustment,
only to realize that it wasn't only the valves ticking. It was/is also my ignition coil.
The car still runs lousy after warm up and restarting when warm.
Could this poor performance be coil related?
Fuel pressure, trigger points and vacuum lines seem to be ok.
The distributor is maximally advanced on it's mounting and reads 5 btdc @ 750 rpm
Car: 72 350sl, W117 engine

Thanks in advance for any assistance.
72 350SL #69
73 450SL Parts Car?
78 450sl Parts Car
79 450SLC - Sold
1985 280sl
87 190E 2.6 - Donated
90 300E-Junked
97 E420
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Old 03-06-2002, 08:14 PM
Registered User
Join Date: Mar 1999
Location: Suwanee, GA, USA
Posts: 4,712
Why not replace it?
Donnie Drummonds
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Old 03-06-2002, 10:26 PM
hill's Avatar
Registered User
Join Date: Feb 2001
Location: Northern Calif Sacramento
Posts: 736
Have you checked it in the dark?

Have you checked it in the dark? The ticking sound probably is arcing. Make sure the coil is clean.
Happy Benzing
Darryl, Hill
2005 SL55 AMG Kleemanized
1984 500 SEC
1967 W113 California Coupe
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Old 03-06-2002, 10:27 PM
Senior Member
Join Date: Apr 2001
Location: Baton Rouge
Posts: 485
I agree to that suggestion . Just dont touch it!!!!!!!!!!!!
euro 287
Mercedes Technician 7 Years (retired to Hyundai)
2000 Dodge Durango
98 Mazda truck
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Old 03-07-2002, 09:23 AM
kowached's Avatar
Rising Member
Join Date: Sep 2001
Location: Michigan
Posts: 74
Check it in the dark with a water spray bottle...

1. Fill an old windex spray bottle with water.
2. At night start your car and pop the hood.
3. Lightly spray the water around your coil and on your wires.
4. Look for little blue sparks jumping off of your wires and/or coil.

Replace anything that has spark jumping from it.

1998 BMW 540i Sport
1995 E320
1992 400E
1989 BMW M3
1979 Triumph TR7 (1st car)
1986 BMW 735i (Sold)
1980 BMW 320i (Sold)
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Old 03-07-2002, 09:27 AM
Registered User
Join Date: Aug 1999
Location: Florida / N.H.
Posts: 8,784
Make sure the primary wire is pushed all the way into the coil tower and seated. If there is a gap, you will not see it under the boot. But it will jump and make a ticking and show a power loss.

Also, clean the top of the coil.
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