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  #31  
Old 05-07-2006, 08:56 AM
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you might try swapping KE control units. I'd take the one from your 560SL and stick it in..I know getting the KE from the SL is a pain but that would be my next step.

BTW, these cars Really like .42 for a gap. Also, which plugs are you running? Are they the new R Bosch plugs? If so get rid of them and get some NGK BP6ES.

Jonathan

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  #32  
Old 05-07-2006, 09:00 PM
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I bought the recommended Bosch plugs from the MB parts dept at the dealership where I work, bought plug wires in the MB box and the shop foreman was the one who said .32 for the plug gap. I hate to say it, but I'm none too impressed with these geniuses at the service dept.
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  #33  
Old 05-07-2006, 09:04 PM
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I'm not touching the SL either...it actually runs and I don't want to make it not want to function...I'm running out of cars to drive. My 116's are not operational yet, and the funds I'm dumping into the 126 are keeping me from working on the 116's...and I'm a little peeved about it.
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  #34  
Old 05-07-2006, 09:41 PM
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Still check the plugs..the dealer will most likely sell the R's which these cars do not like as Bosch no longer makes the correct plug. The dealer also sells Bosch wires...which IMHO are just junk that's made in Spain. The good wires on the market are Beru's, still made in Germany and every single wire I've bought from Beru has worked perfectly. Also, the dealers don't know these cars anymore...all the techs know now is what the computer says..any old-timer would tell you M116/117's Really like a wider gap.

Pulling a KE from the SL should take you about 10 minutes if you take your time. The Best way to diagnose these cars is w/ known good bits from another car..doesn't get any more ideal then that.

Back when I got started w/ Mercedes I chased a bad KE control unit for many months and I spent lots of $$$ in the process...I only wish @ the time that i had another car around that I could swap parts back and forth.

Jonathan
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  #35  
Old 05-07-2006, 10:30 PM
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We have 2 tech's at svc that are willing/able to work on older cars...2 crusty old guys who, if you believe the service writers, are the second coming. The wires already had the sleeve on them so they stay together across the valve covers. They came out of a MB box, but I never saw the actual brand name on the wires.
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  #36  
Old 05-07-2006, 10:31 PM
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where is the KE unit on the car?
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  #37  
Old 05-09-2006, 06:25 PM
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Let's see - car running OK, but having high idle issue ... mechanic changes plug wires and it won't run hardly at all ... I've done this at least three times myself over the years ... greatest likelihood is wires no longer going to correct cylinders, or, more than one wire is bad ... I like the first one better ...

I have had one bad wire in 30 years (after 100K on a late model Chrysler), no completely bad plugs ever ... and three times of screwing up the wire to plugs order ...
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  #38  
Old 05-09-2006, 07:48 PM
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Quote:
Originally Posted by davestlouis
where is the KE unit on the car?
On the 126 passenger side kick panel. On the SL behind the glove box.

Jonathan
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  #39  
Old 05-09-2006, 09:27 PM
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Would you believe we got the plug wires on the right spark plugs and the stupid car ran 100% perfectly all day. One of the old wires literally broke in half, and spilled out what looked like green copper corrosion...I don't want to jinx myself but so far, so good. I purposely drove it to the intersection where it normally starts acting-up on the way home and it ran just fine. The warm idle is still 1050-1100 which is clearly high, but seems lower than it did prior to the plugs and wires being changed.
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  #40  
Old 05-09-2006, 10:16 PM
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I have had this experience. If the wires are old, simply "dressing" them can break them internally, or cause the jacketing to crack (look at running engine in the dark).
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  #41  
Old 05-09-2006, 11:36 PM
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I hope and pray this fixed the immediate problem with stalling. I'll experiment for a week or so, and if it's still running OK, I'll start addressing the high idle, then I have to put a fuel pump on the 450SE, try to un-gunk the fuel distributor on the 280SE and get a plan of action together to un-ugly the 560SL (rust and nasty seats).
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  #42  
Old 05-13-2006, 10:23 PM
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Would you believe, it's running perfectly?!!!!
The hot idle is still 1050ish, which is obviously too high, but aside from that the car is running like a scalded dog. The dealer rebuilt the front suspension, including upper control arms, ball joints and every bushing they could think of, and the car sits up higher, and drives MUCH better...I finally feel like, for the moment, I am improving this car, not just slowing its descent into decrepitude.

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