heeelp W124 keep stalling
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Joined: Jun 2021
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1086 300e
heeelp W124 keep stalling
Hi All.. throwing my self on mercy of the forum.. I am in Australia, and my 96 yr old father has a w126... gearbox blew and fixing it ( on the cheap) has blown out to to over 12 months due to my other life pressures... he is about to drop off his perch and the Merc was his baby...so I decided to grab a cheap 1986 300E of nearly identical color and spec for him while sorting out W126 which has other numerous issues i have found anyway.. dont think its a keeper... W124 had a few teething probs but over all, after a bit of work is a really nice car!! my last remaining glitch is that after it sits idling for 5 to15 mins it simply stalls!.. for my father ( who will really only be driving it to the local shops as he is too decrepit to do much more, is still a worry as he might get rear ended/ sideswiped etc... the w124 had a weird issue where it would simply die randomly ( first 500km after buying it ran 100% perfect)... so i grabbed the ignition module from 126 and swapped in.. no longer have the random "sudden death problem" but still have this now latent issue... I thought was mainly caused by low idle ( 450 rpm) and fiddled with throttle cable to have it idle at 1000rpm for a easy ( albeit improper) fix for next few months... BUT after 5 -15 mins idling it still dies,!! have unplugged the um air/mixture controller plug?.. unit in front of intake under aircleaner ( that made it rev higher and last longer as a random experiment ) but still same prob... as its a 1986 no obd2 plug to diagnose.. really want to give it to him next week before his birthday.. he isnt now up to driving much at all , but at least seeing it in the driveway will give him joy.. totally stumped and on very slim budget... any ideas"?
Last edited by dahump; Jun 22, 2021 at 07:45 PM.
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Joined: Mar 2008
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From: Texas
S63 AMG Coupe AMG GT55
Great story and refreshing to hear your dedication to your father. We need more like you! Do you know or can you tell if it "runs out of gas" when idling? I believe this has the mechanical Bosch injection??? Was thinking at low demand a leak may/could cause it to run out of fuel, higher RPMs have a higher rate of fuel flow from the tank and would overcome a "leak":..... Just spit balling.... Keep us posted and give your father a hug from the MB community here in the States!
Thread Starter
Newbie
Joined: Jun 2021
Posts: 2
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1086 300e
Thanks for your input.... things escalated yesterday when car completly stopped ( at least now easier to diagnose).. had to get towed home... they tried fix it before towing and apparently its a fuel issue... Owner had a new fuel pump and relay installed a month before we got it.. ( have the reciepts)... now have to work out haw to back track and diagnose where the issue actually is!
