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  #1  
Old 04-04-2021, 12:13 AM
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Join Date: Feb 2013
Posts: 95
89 560SEC crank sensor problem?

Hello all, been having extremely hard and sometimes non existent hot starts. I suspect crank sensor is possible culprit but donít have the resistance specs . I tested it cold and with car fully warmed up. What it reads is .890 Kilo-ohms cold or hot.. does anyone know if that reading is within specs?

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  #2  
Old 04-04-2021, 06:55 AM
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Join Date: May 2009
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Quote:
Originally Posted by 1971 280SE View Post
Hello all, been having extremely hard and sometimes non existent hot starts. I suspect crank sensor is possible culprit but donít have the resistance specs . I tested it cold and with car fully warmed up. What it reads is .890 Kilo-ohms cold or hot.. does anyone know if that reading is within specs?
Looks good to me. I've had a 1991 car for almost 25 years and the CPS has never failed. CPS failures on these is rare. Apparently more common on later cars.

I had 30 second hot start misfires and new injectors and seals solved that. Also ensure that all HT is in 1st class condition.

RayH

RayH
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  #3  
Old 04-04-2021, 10:53 AM
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Join Date: Feb 2011
Location: Modesto CA
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Quote:
Originally Posted by 1971 280SE View Post
Hello all, been having extremely hard and sometimes non existent hot starts. I suspect crank sensor is possible culprit but donít have the resistance specs . I tested it cold and with car fully warmed up. What it reads is .890 Kilo-ohms cold or hot.. does anyone know if that reading is within specs?
Spec is 680-1200 ohms.
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  #4  
Old 04-04-2021, 12:58 PM
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Thank you guys, I guess itís toast if those are the specs
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  #5  
Old 04-04-2021, 02:14 PM
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Originally Posted by 1971 280SE View Post
Thank you guys, I guess itís toast if those are the specs
Attention to decimal points is required:
.890 K-ohms = 890 ohms

right in the middle of the spec!!!
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  #6  
Old 04-05-2021, 05:56 AM
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You are absolutely correct. I am not the brightest bulb in the bunch sometimes. Would you know how I can test the EZL module?
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  #7  
Old 04-06-2021, 01:37 PM
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Join Date: Nov 2002
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you need to scope the crank sensor. i cobbled a harness from 123 abs sensors. hook it up to the ezl, then close the hood-builds heat. let it idle. when it stalls, crank it and see if the the scope line is flat. caught alot of the 102 and 103 crank sensors this way. they are more fragile than the ezl-easier to find when they fail. if the cranks sensor still has a signal, then look closer at the ezl.

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