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  #1  
Old 09-05-2003, 09:30 AM
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Location: Convent Station, NJ
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Help me figure this problem out.......

Okay, I've read many of the CIS based problems/soulutions for the 107 SLs but one cannot always draw a solid conclusion. It seems no matter what your problem the answer could be mix or match.

Here's my problem and I was hoping for a reply from someone that experienced the same issue and repaired.

I have an '85 380sl with 56,000 miles. I'm experiencing hard WARM starts. It will fire right up when cold or hot....but 99% of the time I have to crank several times (read too many times) when warm. I think that if I pump on the gas pedal it seems to start easier in this situation. However, this could be my imagination.

next...

On several occasions I'd sit at a light with the car idling....all of a sudden the RPMs jump to about 2k....for NO reason. The car just decides to do it. So I pretty much ruled out the common stuck throttle linkage/cable. Sometimes if I turn the car off and restart it will return to normal...other times not.

Could these two problems be related?


Any clues?

Thanks guys!

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Rick

'85 380 SL (sold)
'85 Carrera Flatnose
'71 280 SL Signal Red/Cognac
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  #2  
Old 09-05-2003, 11:05 AM
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Join Date: Sep 2001
Location: Austin, TX
Posts: 563
The first problem sounds like you're losing fuel pressure. Classic symptoms of a bad fuel accumulator. You'll need a fuel pressure gauge to know for sure. J.C. Whitney has one specifically for CIS. http://www.jcwhitney.com/item.jhtml?ITEMID=1939&BQ=jcw2

I can only guess on the second problem, but I'd guess that you have an air leak somewhere. Check all of your vacuum lines. Stress fractures could cause intermittent problems that you would probably only notice at idle.
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1988 560SL Black/Palomino
1988 300SEL Black Pearl/Burgandy
1984 500SEC Anthracite Grey/Palomino
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  #3  
Old 09-05-2003, 01:01 PM
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Mike,

The accumulator is at the head of the list for the warm start problem. Thanks for verifying.

The Vacuum is an excellent suggestion...especially since my two center air vents stopped working.....I'll check the lines and connectors this weekend. Any particular area to check the lines or connectors?....certain color connectors?

Thanks a million.
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Rick

'85 380 SL (sold)
'85 Carrera Flatnose
'71 280 SL Signal Red/Cognac
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  #4  
Old 09-05-2003, 02:33 PM
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Warm start problem

When's the last time the fuel injectors where replaced? Over time they start to leak and that may be where your losing fuel pressure.
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  #5  
Old 09-05-2003, 02:41 PM
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Hmm, I doubt at 55k mile they've ever been replaced. Is it obvious if they're leaking?
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'85 380 SL (sold)
'85 Carrera Flatnose
'71 280 SL Signal Red/Cognac
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  #6  
Old 09-05-2003, 03:16 PM
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Look for black smoke when it starts.
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  #7  
Old 09-05-2003, 11:10 PM
moonflight
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sl hard start ....hot

Fuel pressure can aslo be lost at the fuel pump check valve and the fuel distributor fuel pressure control valve along with previously mentionted items.

The idle problem probably is not related. I also doubt a vacuum problem since it is intermittent. I suspect a defective idle control valve or a the the idle control ECU is more likely.

Good luck.

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