88 420 sel - Runs then no spark - PeachParts Mercedes-Benz Forum

kenalb · #1 07-21-2005, 04:53 PM

88 420 sel - Runs for ten min
then no spark.
0 volts at both term. of coil
then turn key off and then back on 12V
As it gets hot, the problem gets worse
Reference Sensor ?
Ignition Control Unit ?
Help

danwatt · #2 07-22-2005, 03:38 AM

The coil itself sounds shot. You've got the symptoms.

kenalb · #3 07-22-2005, 08:17 AM

The crank reference sensor
is at 900 ohms before and after the problem, so I think thats ok
I was also thinking coil, but why does it lose the 12v signal?
Ken

Kebowers · #4 07-22-2005, 02:56 PM

Sounds like the ignition control unit--but get a real good diagnosis first--those things are mucho dinero

Similar Threads
Thread	Thread Starter	Forum	Replies	Last Post
86' 420 SEL rough ilde after mechanic replace all 8 injectors....	mm888333	Tech Help	19	01-18-2012 11:20 AM
W126 Fuel Line For Sale - 1989 420 SEL	Cigar Havana	Mercedes-Benz Used Parts For Sale & Wanted	0	10-29-2004 10:12 PM
'84 300 td v. '88 420 sel	asti84	Diesel Discussion	4	06-23-2004 05:37 PM
help,dont know what to do 420 sel	Louis	Tech Help	10	03-16-2003 10:58 PM
W126 420 SEL Dome light diagnosis help...	96C220	Tech Help	14	11-07-2002 01:11 AM