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  #1  
Old 01-24-2011, 02:02 PM
JamesDean's Avatar
Electrical Engineer
 
Join Date: Apr 2005
Location: NE Ohio
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m117 560SEL Odd Behavior

Hey everyone,

I figured someone out here might be able to help solve this problem.

My buddys 560SEL acts wimpy, out of power, vacuum loss (measured by the econo gauge, stalls sometimes, when it hits 60C. Up until this point the car run fine. Once it passes this mark on the temp gauge all is right with the work again..

Anyone have any thoughts on this?

It has a recent tune up, new ovp, fuel pump relay....
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  #2  
Old 01-24-2011, 07:48 PM
Hit Man X's Avatar
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Kris, light that car on fire already.
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I'm not a doctor, but I'll have a look.

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  #3  
Old 01-26-2011, 07:30 PM
dpetryk's Avatar
Electrons can do anything
 
Join Date: Sep 2001
Location: Houston, Texas
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Replace the temp sensors that the ignition unit uses as well as the one for the engine ECU. Temperature related open circuit in the sensor makes the car think it is at a high or low temp. Mixture gets all screwed up. When the car warms up the sensor begin working properly and all is right with the world.
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82 242 Turbo Volvo - Manual - 270k
86 300e 5 speed manual - 210k
87 420sel - 240k
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  #4  
Old 01-26-2011, 07:53 PM
JamesDean's Avatar
Electrical Engineer
 
Join Date: Apr 2005
Location: NE Ohio
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The 4-pin CIS temp sensor has already been replaced. You do make a valid point though. I wonder if we were to wire in a resistor (= to 80C) if the car would exhibit the same behavior...
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Cruise Control not working? Send me PM or email (jamesdean59@gmail.com). I might be able to help out.
Check here for compatibility, diagnostics, and availability!

82 300SD 145k
82 300SD 265k
87 420SEL 230k
89 420SEL 210k
89 560SEL 118k
90 300SE 262k RIP 5/25/2010
90 560SEL 154k
91 300D 2.5 Turbo. 241k
93 190E 3.0 235k
93 300E 195k
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  #5  
Old 01-27-2011, 07:15 AM
dpetryk's Avatar
Electrons can do anything
 
Join Date: Sep 2001
Location: Houston, Texas
Posts: 1,071
That would be a good diagnostic test.
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I got too many cars!! Insurance eats me alive. Dave

78 Corvette Stingray - 3k
82 242 Turbo Volvo - Manual - 270k
86 300e 5 speed manual - 210k
87 420sel - 240k
89 560sl - 78k
91 420sel - 205k
91 560sel - 85k
94 GMC Suburban - 90k
97 Harley Davidson Heritage Softail - 25k
00 GMC Silverado 1 ton 30k
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  #6  
Old 02-07-2011, 10:01 PM
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Join Date: Jan 2008
Location: Arlington, Texas
Posts: 37
My 1986 500 sl had the exact problem. After testing all the systems, ignition, fuel, replacing lots of parts, I cut a hole in the exhaust before the cat converter and the problems all went away. Check for exhaust back pressure.
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  #7  
Old 02-08-2011, 12:26 AM
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Join Date: Jul 2008
Posts: 1,236
Wait, so it runs good cold until it hits 60, then runs crappy, then runs good again once it gets up to temp?


That totally sounds like a bad temp sensor. My 300SE is doing something similar right now, but I've been so busy with the heater core that I haven't looked at it yet. However, mine just runs like crap until it gets warmed up at this point. Temp sensors are testable.
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