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Discussion Starter #1
I have a 1996 sl 320 with about 60,000 miles. During the past 2 weeks twice after the car was turned off it would not start again until about 15 minutes later. Battery is nearly new and the engine spins over fine but it won't fire. I checked all fuses for ignition and injection and they are ok. Plenty of gas in the tank. I'm thinking crank position sensor but once running I noticed a dash light at idle indicating a brake malfunction which goes out once the car is underway. Any suggestions would be most appreciated. Thanks... Bill
 

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1997 SL320 Sport
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28 Posts
same issue...

97 sl320..just bought it..now wont start...just cranks and cranks...charged the battery still the same. Im thinking more along the lines with you..crankshaft Pos. sensor...does anybody know how to test it?
thanks
Michael
 

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1991 500SL V8 NEOKEN modified T/B. 2000 F350 4x4 V10. 1995 SL500
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201 Posts
Ignition switch module could be bad. The one behind the key switch. That's what was bad on mine. Same issue. If the engine is hot then it won't start then it's the CPS.
 

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1997 SL320 Sport
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ok...

well...im in a hole now...the CPS could still be faulty on a cold no start though right? Should I be checking for fuel and spark just like my Chevy? ( i know..its a bad word in here sorry)
 

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Discussion Starter #5
Although my thread has been somewhat hyjacked, my starting problem still exists. Where would I find the crank position sensor on my 6 cylinder SL 320 and how difficult is it to replace ? Thanks... Bill
 

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1997 SL320 Sport
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sorry you feel hijacked....not my intention...we have similar problems thats all..heres the paper from the dealer showing the CPS...however...im not sure which part it is? Any help guys? maybe #77?
 

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Greek God of the R129
SL500-500SEL-190E
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8,391 Posts
I don't know the six but I think that #22 is the sensor.
I think #77 is the knock sensor.

Regards,
aam.
 

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1997 SL320 Sport
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fixed...

You are correct #22 is the Crank Sensor, problem was the key. When I swapped the remote Key housing I may have damaged something, anyway...with the new $30 (remoteless) key it started right up. But the shortly after the first key started working again....so...maybe its the module behind the key?
 

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91 500 sl Japanese Import
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3 Posts
Starting problem

If it does eventually start. Try the fuel accumulator. It was the problem with my 91 500, it acts like a back flow valve. If it isn't functioning properly the fuel pressure will be released, hence hard to start.
 

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1991 500SL V8 NEOKEN modified T/B. 2000 F350 4x4 V10. 1995 SL500
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201 Posts
My car eventually started after about 20 trys. Still ended up being the contacts in the module for the switch. I took it apart and adjusted the contacts and WOALA.
 

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2000 Obsidian Black Metallic Mercedes SL 320 V6
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Guys I'm sorry to be pedantic but please update your profile with your car, year and location to help us help you in the best and quickest possible way. For us it’s extremely important you do this.

Cheers
 
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