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#1
09-24-2007, 04:15 PM
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Ignition Control Unit Test ??
I have a 84 380 SL with 165,000 miles that has been well maintained and garage kept. I'm having trouble getting it started. It is not getting any spark at the plugs or the coil wire at the distributor. I check the coil wire for resistance was okay, checked the coil, primary and secondary wiring are good. I now am suspecting the Ignition control unit.
Does anyone know if there is a wat to test the ICU? Thanks 
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#2
09-25-2007, 09:42 AM
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when this happened to me I found a short on the condenser line out of the distributor, years of vibration caused the mount to wobble and short out. If you want you can always bypass the ICU using a conventional point set up with resistor bars
__________________
Ron 2015 Porsche Cayman - Elizabeth 2011 Porsche Cayman - Bond,James Bond Sadly MERCEDESLESS - ALways LOOKING ! 99 E320 THE Queen Mary - SOLD 62 220b - Dolly - Finally my Finny! Sadly SOLD 72 450SL, Pearl-SOLD  16 F350 6.7 Diesel -THOR 19 BMW X5 - Heaven on Wheels 14 38HP John Deere 3038E Tractor -Mean Green 84 300SD, Benjamin -SOLD 71 220 - W115-Libby ( my first love) -SOLD 73 280 - W114 "Organspende" Rest in Peace 81 380 SL - Rest in Peace
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#3
09-25-2007, 12:39 PM
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Quote:
There is an outfit in FL (www.4mercedes.com) that will test your ICU for a fee which they subsequently credit towards a rebuild, if it's needed. Careful before you declare your coil ok by resistance testing the windings. Mine tested good that way, but turned out to be dud anyway. Coils are a lot cheaper than ICUs.
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#4
09-25-2007, 02:51 PM
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what is the part number?, I have several lying about
__________________
Ron 2015 Porsche Cayman - Elizabeth 2011 Porsche Cayman - Bond,James Bond Sadly MERCEDESLESS - ALways LOOKING ! 99 E320 THE Queen Mary - SOLD 62 220b - Dolly - Finally my Finny! Sadly SOLD 72 450SL, Pearl-SOLD 16 F350 6.7 Diesel -THOR 19 BMW X5 - Heaven on Wheels 14 38HP John Deere 3038E Tractor -Mean Green 84 300SD, Benjamin -SOLD 71 220 - W115-Libby ( my first love) -SOLD 73 280 - W114 "Organspende" Rest in Peace 81 380 SL - Rest in Peace
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#5
09-25-2007, 03:26 PM
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According to AllData, you need to replace the switching unit if:
- there is anything other than 0 volts between pins 4 and 5 of the diagnostic socket - dwell, measured at pin 1 of the diagnostic socket is > 23 degrees
__________________
Chuck Taylor Falls Church VA '66 200, '66 230SL, '96 SL500. Sold: '81 380SL, '86 300E, '72 250C, '95 C220, 3 '84 280SL's '90 420SEL, '72 280SE, '73 280C, '78 280SE, '70 280SL, '77 450SL, '85 380SL, '87 560SL, '85 380SL, '72 350SL, '96 S500 Coupe
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#6
09-25-2007, 04:27 PM
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Thanks for all the useful info. I'm in the Phoenix area, but don't know anyone in the area that I could test the unit (and coil for that matter). I don't want to just replace parts, I'd like to find the source of the problem.
Thanks again. 
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