Idle problems - Mercedes-Benz Forum

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post #1 of 11 (permalink) Old 06-27-2004, 02:33 PM Thread Starter
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Vehicle: 1979 450 SL
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Idle problems

1979 450 SL when I first start my 450SL it will run @ 1800 rpms, after about 5 minutes it will drop to about 1000 rpm. It also idles very rough. Need help!

Jim
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post #2 of 11 (permalink) Old 06-27-2004, 02:46 PM
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RE: Idle problems

how to check and set things up
http://www.benzworld.org/publications/pub.asp?id=243
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post #3 of 11 (permalink) Old 06-27-2004, 05:11 PM
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RE: Idle problems

well now I am pissed [:(!]

my OS is running again
THAT IS BESIDES THE POINT
My MB user manual that I bought is a worthless pice of carp!
I just double checked the emissions issue. I have read that US models starting in 74 had catalytic converters... and my user manual verified that..
well I checked the required items and their locations. Basically my car should have the K-Jetronic plus a rather simple computer, lamba sensor and some other goddies... none of the items I could find.. I ripped half my interiour appart to find i.e. the CIS-E unit, altitude compensation device or the connectors for the O2 sensor.. nada.. zip .. zilch.. nothing. Looks all original....

Heck I am fine with that.. did not want a cat anyways and like the hiogher HP on the car.. but why the heck are there original Mercedes Benz stickers on my vehicle saying that I do have a catalytic converter on board???????????????

feeling better now....

Later... going to burn this uselss CD in my back yard now [:(!]
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post #4 of 11 (permalink) Old 06-27-2004, 06:15 PM
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RE: Idle problems

see your one of the lucky ones you got an import, now thats a nice end to the day[:)] somebody probably thaught the cat sticker looked good
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post #5 of 11 (permalink) Old 06-27-2004, 07:06 PM
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RE: Idle problems

hi .. man I would be delighted if this would be an import indeed... however I am rather afraid that the documentation I have is off and it shows a later emmissions system.....
I was quite amazed when I read the elaborate effort on this emmissions system. Looking back in the mid late 70's I would have guessed that is should have been a non regulated cat...

So I think it is something like this:
the car is a regular (low power :-(( ) US version. The cat sticker is real. The documentation I do have is not for my model year, instead for an older model. Even though the CD says 1978 on it, and some wire diagrams show that year, the CIS-E documentation just features page numbers.. and they are all scanned PDF files...

The only thing now is, what do I trust on this CD and waht not?
Or better yet, is there a 450 owner 77' - 79' that could confirm they run on an non regulated cataltic converter....

Cheers, Mike
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post #6 of 11 (permalink) Old 06-27-2004, 07:15 PM
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RE: Idle problems

if it dosnt have the o2 sensor then it never had the cat ( no need for it ) the cat would soon coke up if the system wasnt in place like all the things that go with cats (cannister purge valve,egr system ) as long as it passes the emmisions there is no problem, a little tip on htat is allways do a full service "oil & filter, air filter,plugs" before you take it in and use full synthetic oil it lowers the emmissions
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post #7 of 11 (permalink) Old 06-27-2004, 07:25 PM
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RE: Idle problems

if you read the service adjustments 1.3 on the Co you car should be fitted with air injection and thats the early clean systems
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post #8 of 11 (permalink) Old 06-27-2004, 07:34 PM
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RE: Idle problems

Hi teky
interresting indeed...
hmmm and I for sure thought I remembered "non regulated" cats in the early 80's back when I was in Europe....
I wish I could see a parts number on this muffler (it features 2 mufflers) and know for sure... but I will take your word for it.....
Besides, I do have a passive air injection (not the California version with an air pump) and an EGR system
.....
lol... strange place this is we live in....

are you actually in the UK or here in the US?

Thanks man
Mike
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post #9 of 11 (permalink) Old 06-28-2004, 12:35 PM
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RE: Idle problems

uk mate[:)]
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post #10 of 11 (permalink) Old 06-28-2004, 01:06 PM
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RE: Idle problems

wow [:D]you certainly run late hours dude [8D]
you are a real contribution to this forum!!!

Thanks
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