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1988 Mercedes Benz 420SEL 258,000 miles (SOLD) 1991 300se 168,000 miles, ASR 1999 GMC Yukon 192,000
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Discussion Starter #1
after i got home from purchasing my 420SEL i noticed this wire hanging loose and melted to the side of the motor, im guessing it came loose from its casing and rubbed up against the hot engine block, but what it for?
 

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1988 Mercedes Benz 420SEL 258,000 miles (SOLD) 1991 300se 168,000 miles, ASR 1999 GMC Yukon 192,000
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1,376 Posts
Discussion Starter #2
another view

what ever it is can it be important?
 

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CH4S Admin , Outstanding Contributor
1985 500SEC, 1991 190E 2.6.
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39,643 Posts
Looks like a vacuum line.
You can find the vacuum diagram for your car with a forum search.
Cheers
 

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1988 Mercedes Benz 420SEL 258,000 miles (SOLD) 1991 300se 168,000 miles, ASR 1999 GMC Yukon 192,000
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1,376 Posts
Discussion Starter #4
and? this his bad, ive been driving for a week and havent noticed anything??
 

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1983-2007 MB's
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8,020 Posts
Look at your upper intake plenum after removing the air filter housing. On the left side there should be a cane shaped rubber fitting with a check valve (on some cars) - this is where this vacuum line went on my car. Check and see if the line is broken or came dislodged - that rubber cane fitting can get loose over time.

I think this line has something to do w/ the smog air pump system which is probably why you haven't noticed any serious repurcussions.
 

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1988 Mercedes Benz 420SEL 258,000 miles (SOLD) 1991 300se 168,000 miles, ASR 1999 GMC Yukon 192,000
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1,376 Posts
Discussion Starter #6
will there be i have to drive into philly tonight?
 

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1988 Mercedes Benz 420SEL 258,000 miles (SOLD) 1991 300se 168,000 miles, ASR 1999 GMC Yukon 192,000
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1,376 Posts
Discussion Starter #7
could i temporaralyy patch it with electrical tape?
 

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'82 Euro 500SEL, '85 Euro 500SEC AMG WB Cabriolet,'86 Euro 500SEC RUF
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9,487 Posts
I believe that is the vacuum shutoff line for the air pump. Does your airpump shut off after about 30 seconds of idling when first started? If not that is the reason why.
 

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1988 Mercedes Benz 420SEL 258,000 miles (SOLD) 1991 300se 168,000 miles, ASR 1999 GMC Yukon 192,000
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1,376 Posts
Discussion Starter #9
thanks for the response and yes it does..
 

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1991 420SEL, flirting with 200k
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150 Posts
I believe that is the vacuum shutoff line for the air pump. Does your airpump shut off after about 30 seconds of idling when first started? If not that is the reason why.
Do you mean the air pump for the pollution control system, geez I hacked the belt off of that thing, could that cause problems?
 

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1983-2007 MB's
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8,020 Posts
Yes thats it. How strict is Ohio's smog testing?

Having the system disabled should cause no issues, except for when Uncle Sam coems to do your smog test, at least here in Cali...

Do you mean the air pump for the pollution control system, geez I hacked the belt off of that thing, could that cause problems?
 

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1988 Mercedes Benz 420SEL 258,000 miles (SOLD) 1991 300se 168,000 miles, ASR 1999 GMC Yukon 192,000
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1,376 Posts
Discussion Starter #12
eff

well i have my emissions test tomorrow, i dont know how strict it is in PA but it doesnt matter cause my alternator belt burt to hell on 95, made it home but missed the game, hopefully it wont cost that much to put back on...
 

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1983 300 SD, 1991 420 SEL, 1979 300SD
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536 Posts
from reading the manual it looks like the air smog pump is designed to shut off if coolant temp is over 70 C degrees, shouldn't have any problems with emissions testing....i had my emissions done bout a month ago (very low emission #'s) and my smog pump's belt has been missing since i bought the car...i guess it's only purpose is to reduce emissions during engine warmup...
 

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1988 Mercedes Benz 420SEL 258,000 miles (SOLD) 1991 300se 168,000 miles, ASR 1999 GMC Yukon 192,000
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1,376 Posts
Discussion Starter #14
thanks for the reply....haha so you know anything about alternator belts...
 

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1987 420SEL
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1,133 Posts
If you're looking to remove the air pump, I'm going to be putting together a few little kits (Not sure as to the exact contents yet, depends on how elaborate I want to make these) to reliably plug the hole in the timing case cover that is left by removing the check-valve from the air pump.

The plug will be made out of an M22 x 1.5 bolt, and some sort of sealing piece, probably an O-ring and a specially shaped washer. I haven't decided yet.

I had to order a small quantity of the bolts, and I only need one, which is why I'm offering.
 

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1988 Mercedes Benz 420SEL 258,000 miles (SOLD) 1991 300se 168,000 miles, ASR 1999 GMC Yukon 192,000
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1,376 Posts
Discussion Starter #17
air pump

i dont think i could replace the air pump myself a little to advanced for me, iv just been wondering what to do with the loose hose for the time being.

thanks for the belt diagram
 

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1987 420SEL
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1,133 Posts
i dont think i could replace the air pump myself a little to advanced for me, iv just been wondering what to do with the loose hose for the time being.
Air pump's easy to do; a few bolts and it literally just falls off (if it hasn't already).

I was refering to removing it permanently; when you do that, it leaves a port in the front engine cover open.

After the engine is warm, the whole system is dead-weight. (It doesn't do much even when it is in working order.:thumbsup:)
 
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