SL/R129: Crank Position Sensor
Thread Starter
Junior Member
Joined: Sep 2010
Posts: 19
Likes: 0
sl500 1995
Crank Position Sensor
Just on an instant: almost no start and running rough. Is it an intermittent problem? Or rather one that may come and go? Or hokey acting?
How common is the CPS problem. It is listed high on a website I found.
How common is the CPS problem. It is listed high on a website I found.
Member
Joined: Sep 2008
Posts: 203
Likes: 21
From: North East
04 E500, 00 SL500, 99 SL500, 94 E420, 92 500E, 92 500E, 92 300CE, 06 Lexus GX470
Same Info
It convinced me to be proactive and just change it out now.
$50 for a part that "generally" has a life span of 10 years is a no-brainer.
The only other thing I need is a 1/4 etorx socket set, $20..
So for $70 and about 30 minutes DIY time, that problem is avoided.
I already ordered one from AutohausAZ, it will be here in two days, and will save an expensive tow. I bet it's never been changed on my 99, even if it has, I'm making sure..$70 is cheap insurance.
The problems you are asking about don't fit that other information. CPS failures they described are GO-NOGO, nothing in the middle, the engine either runs correctly or it doesn't run at all.
Senior Member
Joined: Aug 2006
Posts: 391
Likes: 6
From: So California
2000 SL500
Crankshaft Position Sensor (CPS) DIY
The problem will exhibit itself when you are in traffic and the engines gets hot. All of a sudden it will just die with no CEL. So you have to wait awhile until the engine cools down and she will start until it gets hot again. The easiest way to diagnosis this problem is to have a gallon of water available to pour over the top back end of the drivers side of the engine at the bell housing where the CPS is located. The water will cool the sensor and the engine will start. VIOLA!
If you own a 99-02 SL buy your $45.00 CPS at AutohausAZ and carry it in the trunk for protection. Or until your ready to tackle this hard to get at location. Be prepared to drop the bolt that holds the CPS unless you read one of the DIY and take a suggestion from one of the guys as to how NOT to loose the bolt.
Last edited by lynns; Jun 27, 2013 at 11:26 AM.
Thread Starter
Junior Member
Joined: Sep 2010
Posts: 19
Likes: 0
sl500 1995
I searched the AutohausAZ site with no luck. Bought from Parts Geek @$102.nn Tried buying a Bosch from ?memory? and got an email back saying they were out or no longer supplying them.
Thanks for the advice; hope to run soon.
Thanks for the advice; hope to run soon.
Senior Member
Joined: Aug 2006
Posts: 391
Likes: 6
From: So California
2000 SL500
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Member
Joined: Mar 2007
Posts: 158
Likes: 0
From: Victoria Australia
C63 AMG, C36 AMG, SL500
I am worried my car may have this issue. Normally starts and runs fine for a while. Sometimes once warm runs really rough or evens stops at lower RPM. Sometimes will not restart till cool. Can someone post a picture of where the CPS is so I can see if I can try the water trick to cool it down. Note I have RHD model. Thanks a lot.
Senior Member
Joined: Aug 2006
Posts: 391
Likes: 6
From: So California
2000 SL500
Normally starts and runs fine for a while. Sometimes once warm runs really rough or evens stops at lower RPM. Sometimes will not restart till cool. Can someone post a picture of where the CPS is so I can see if I can try the water trick to cool it down. Note I have RHD model. Thanks a lot.
Senior Member
Joined: Aug 2006
Posts: 391
Likes: 6
From: So California
2000 SL500
Member
Joined: Mar 2007
Posts: 158
Likes: 0
From: Victoria Australia
C63 AMG, C36 AMG, SL500
Lynns, thanks very much for the link, I tried to search but did not come up with that thread. I used the water trick last night and that let the car run again so I ordered a sensor last night.
