C36 AMG, C43 AMG (W202) 1995 - 2000

Auto start vs. hold key until starts

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Old Apr 5, 2021 | 10:29 PM
  #1  
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1998 C43 w/ 55 swap Wavetrac LSD and 6-Speed manual
Auto start vs. hold key until starts

I don't know the correct term for this feature - which is probably why I can't find anything searching.

Car is a 1998 C43 (w/ 55 swap but that was 6000 miles ago and this problem is new.)

What I'm talking about is how the ignition key typically is twisted clockwise to the start position and then released - car will crank as much needed to start the car automatically.

Lately that is only working about 50% of the time. When it fails it will crank for a split second only. I then have to turn the key counter-clockwise and then back clockwise to start and HOLD until the engine starts.

The engine always starts and it starts with a normal amount of cranking...I just need to hold the key.

Battery is good.
Same result w/ a new key (couple months old) and original key
New crank position sensor (no change)
New cam position sensor (no change)

Any ideas? Doesn't look like a K40 relay issue based on what I've read.

Thanks
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Old Apr 6, 2021 | 02:04 AM
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05 c55 silver, 98 Imperial Red C43
Theres a small window underneath on the trans. Grease up the gears in there.
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Old Apr 6, 2021 | 03:14 AM
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12' W204 C63 AMG coupe "T-Rex", 12' W451 Smart Fortwo Pulse (99' W202 C43 AMG + Ultima Can-Am sold)
Originally Posted by PJmak
Theres a small window underneath on the trans. Grease up the gears in there.
What grease do you use to apply to the cogs?
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Old Apr 6, 2021 | 07:03 AM
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1998 C43 w/ 55 swap Wavetrac LSD and 6-Speed manual
You are talking about the ring gear on the flex plate?
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Old Apr 6, 2021 | 10:21 AM
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05 c55 silver, 98 Imperial Red C43
Originally Posted by x463
You are talking about the ring gear on the flex plate?
Yep. I had it done once or twice and it seemed to have resolved the issue.
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Old Apr 6, 2021 | 10:22 AM
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05 c55 silver, 98 Imperial Red C43
Originally Posted by DRBC43AMG
What grease do you use to apply to the cogs?
Honestly I dont remember but im sure anything will work
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Old Apr 7, 2021 | 10:31 AM
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Could be your electronic ignition switch going bad? Do you hear a click when you put the key in and take it out? Mine went bad and had to be replaced.
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Old Apr 8, 2021 | 10:50 AM
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1998 C43 w/ 55 swap Wavetrac LSD and 6-Speed manual
Not sure about the click. Will pay more attention. Is that an expensive dealer only repair w/ Star programming?
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Old Apr 8, 2021 | 01:38 PM
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Yes, mostly likely has to be done by the dealer. If I recall correctly, it was around $300.
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