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  #1  
Old 01-04-2010, 01:18 PM
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Talking Help Please, 1988 420sel keeps dying

Hi everyone, Just wanted to say thanks in advance. Also I did use the search button before I posted this. First off, I don't know if this has anything to do with it but the other day we got like two feet of snow and and I had to drive threw it so there was allot of snow on the undercarriage of the car. Well today I go to drive to work and I go outside to start the car and warm it up. Well it started fine and I went back inside to finish getting ready. Well I noticed the car was not running after about 5 minutes. I thought that was strange because it has never done this in the past. Well I get back in and attempt to go to work and it dies again. It seems the longer I let it sit the longer it will run. If it dies and then you start it up it will only run for about 10-15 seconds. if you wait a minute or 2 it will run for about 45 seconds. I noticed also that my RPM gage goes a little funky when it does this but none of the other gages go crazy. I tired taking of the fuel cap to see if maybe it was a plugged vent but that did not help at all. Next on the list is to check the fuel filter. I let is sit for a few minutes and started it and went to listen to the fuel pumps and they sound as they always do. Has anyone else ran into this problem or might know what I should do?
Thanks
Kevin
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  #2  
Old 01-04-2010, 01:32 PM
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Location: Great State of Texas
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Got enough gas?

Will it die even if the throttle is depressed?
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Unless stated otherwise, any question I ask is about my greymarket 1985 380SEL.
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  #3  
Old 01-04-2010, 01:35 PM
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Yes it does. Sorry I forgot to mention that also. If you let it run in park or neutral it will build RPMS then die. So I know it has something to do with the fuel... just not quite sure what.
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  #4  
Old 01-04-2010, 05:27 PM
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Location: St. Joe, MI; Manitowoc, WI
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Bump - does anybody have any ideas for my kid?

Something he didn't add - he recently fueled it up. I suggested he buy a new fuel filter, which he did, and he is now towing it over to a freind's place so they can work on it.
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Thank You!
Fred
2001 E430 Sport, 204,000 miles
1997 C280 Sport, 144,000 miles
1991 300SL, 189,000 miles
1987 420SEL, 149,000 miles
1986 190e 2.3 16v, 151,000
1968 W30 442, 78,000 miles
1988 46' US1 Cougar, 3 supercharged 572's
http://s4.photobucket.com/albums/y145/waybomb/
Warming the globe, 24 cylinders at a time
And I want a 126 wagon! Point me to one!
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  #5  
Old 01-04-2010, 08:05 PM
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New fuel filter, still same symtoms...
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  #6  
Old 01-04-2010, 11:29 PM
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Also both pumps seem to be running fine... Any thoughts? I also took a heat gun to all the fuel lines to make sure there was no ice...
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  #7  
Old 01-04-2010, 11:32 PM
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Location: Downey, SoCal
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I guess the next step would be to test fuel pressure?
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  #8  
Old 01-04-2010, 11:44 PM
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Quote:
Originally Posted by johnathan1 View Post
I guess the next step would be to test fuel pressure?
How to I test the pressure on these? Is there a shreader valve or?
Kevin
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  #9  
Old 01-05-2010, 12:11 PM
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Location: Great State of Texas
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Unplug the fuel pump relay and see if it'll start/idle on starting fluid alone (you'll have to push open the air sensor plate). If not, it's probably not a fuel issue.
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A.S.E Tech A1,A6,A7,A8 & MVAC 609 + EPA 608

Unless stated otherwise, any question I ask is about my greymarket 1985 380SEL.
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  #10  
Old 01-05-2010, 07:48 PM
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Location: St. Joe, MI; Manitowoc, WI
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Someone suggested to me to check the battery........
Kev just called me - it was the battery!

The car started fine. Makes no sense to me but if it works, it works!
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Thank You!
Fred
2001 E430 Sport, 204,000 miles
1997 C280 Sport, 144,000 miles
1991 300SL, 189,000 miles
1987 420SEL, 149,000 miles
1986 190e 2.3 16v, 151,000
1968 W30 442, 78,000 miles
1988 46' US1 Cougar, 3 supercharged 572's
http://s4.photobucket.com/albums/y145/waybomb/
Warming the globe, 24 cylinders at a time
And I want a 126 wagon! Point me to one!
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