79 300sd wont turn off - PeachParts Mercedes-Benz Forum

superdave · #1 10-20-2005, 12:28 PM

i have a 1979 300sd and about 2 months ago i had to start using the kill lever on the throttle linkage. please advise.

thanks,

dave

boneheaddoctor · #2 10-20-2005, 12:31 PM

Quote:

Originally Posted by superdave

i have a 1979 300sd and about 2 months ago i had to start using the kill lever on the throttle linkage. please advise.

thanks,

dave

check the shutoff solenoid...make sure the vacuum line is still there, its not sucking oil adn that if it gets vacuum when you turn key off then the shutoff valve is bad..if it gets no vacuum with key turned off start tpo look further back..

superdave · #3 10-20-2005, 12:40 PM

hey bonehead. this is dave i got the sunroof motor from ya. where is the shutoff seloniod located.

dave

boneheaddoctor · #4 10-20-2005, 12:53 PM

Quote:

Originally Posted by superdave

hey bonehead. this is dave i got the sunroof motor from ya. where is the shutoff seloniod located.

dave

it is the round thing with th evacuum line on the back of the IP....(facing the oil filter tower)

Turn the key off and it feeds vacuum to that pulling a fuel shutoff...internal to the IP.....

look here...

http://skinnerbox.steaky.org/Service/W123/w123CD2/Program/Engine/617/07_1-150.pdf

superdave · #5 10-20-2005, 01:01 PM

i pulled the vaccume line off and there is a bit of oil on the nipple. and when the car is running and key off i still get vaccume from the line. i guess this part is bad. do u know if it can be fixed or a rough cost on the part.

thanks again,

dave

boneheaddoctor · #6 10-20-2005, 01:08 PM

http://catalog.eautopartscatalog.com/mercedesshop/sophio/quote.jsp?clientid=catalog.mercedesshop&cookieid=1N40S3GMA1N40S3NSX&baseurl=http://catalog.peachparts.com/&partner=mercedesshop&year=1979&product=D2020-11537&application=000004564

Current price $66.50 from Phill at fastlane......put a mightyvac on the shut off valve... it should hold vacume...if it doesn't then its bad.....you will suck motoroil into the vacuum system when the diaphram fails.

superdave · #7 10-20-2005, 02:00 PM

hey hey, i do have oil all in the three lines that go to and come from the solenoid. i have had a rough oscilating idle for the same amount of time that i have not been able to turn it off. could this have anything to do with it. and will i need to clean out the lines of oil.

thanks thanks,

dave

boneheaddoctor · #8 10-20-2005, 02:02 PM

Quote:

Originally Posted by superdave

hey hey, i do have oil all in the three lines that go to and come from the solenoid. i have had a rough oscilating idle for the same amount of time that i have not been able to turn it off. could this have anything to do with it. and will i need to clean out the lines of oil.

thanks thanks,

dave

the solenoid only has ONE line going to it....its the round thing.....on the back...
the other two go to the plastic thing on top that meters vacuum for the transmission. the shutoff vacuum line goes back to the firewall,

The vacuum valce on top has one that goes to trans modulator and the other feeds via a T into the vacuum lines from the vacuum pump...different lines different purpose.

superdave · #9 10-20-2005, 02:29 PM

thanks again for all your help on this type of stuff u have been a big help. is this solenoid im looking for on the ip in the front side of the white plastic unit that the vaccume line goes to the trans module. the solenoid i see now is aluminum and has 1 large white line going to it. it has a part number on the body of 1627133150.

and do u know of somewhere i can put in this part number and it will tell me what it is.

thanks a bunch.

dave

superdave · #10 10-20-2005, 02:31 PM

i think i found it. it is on the very back of the ip. it has 1 brown line that goes through the firewall.

boneheaddoctor · #11 10-20-2005, 02:34 PM

Quote:

Originally Posted by superdave

i think i found it. it is on the very back of the ip. it has 1 brown line that goes through the firewall.

yes...on the very back.....the squarish thing on top is the ALDA...the yellowish plastic thing with two lines is the vacume valve...the roud metal canister sticking out the back is the shut off solenoid. And yes I remember it being a brown line at the firewall....mine has a clear piece sliced in before the shutoff valve.