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multiply lightning strike (Read 107 times)
autosparky
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multiply lightning strike
Sep 30th, 2015 at 12:21am  
Mercedes V8 140 chassis
ignition system has 1 crank sensor, ignition module, 2 coils and 2 distributor(each does 4 cylinders)

The problem was backfiring, simple enough job to diagnose, unplug each king lead but it still back fires, after checking the firing order I found this
The cap towers were shorted
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IMAG0696.jpg (515 KB | )
IMAG0696.jpg
can't see, can't hear, can't remember
 
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autosparky
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blind worker

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Porirua, New Zealand
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Re: multiply lightning strike
Reply #1 - Sep 30th, 2015 at 12:30am  
So I killed some time to see what's happening on each plug lead

Didn't think it was possible but I got spark from all four leads.
I also plugged in some dummy spark plugs to see spark, yes weak but 3 or 4 were sparking at the same time.

Couple of new caps fixed the problem
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right_se_backfire_cranking.psdata (10269 KB | )
IMAG0695.jpg (484 KB | )
IMAG0695.jpg
can't see, can't hear, can't remember
 
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royd
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Trumbull, Connecticut, USA
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Re: multiply lightning strike
Reply #2 - Oct 3rd, 2015 at 5:23pm  
Very nice capture! Another very common secondary issue on these is the ignition rotor carbon tracing to the steel flange behind.
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