Strange happenings

1973-1980 : 280S, 280SE, 280SEL, 300SD, 350SE, 350SEL, 450SE, 450SEL, 450SEL 6.9
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Pete49
Adenauer
Posts: 329
Joined: Thu 09 Oct, 2014 4:42 pm
Model you own: w123
Location: Pt Augusta Sth Australia

Strange happenings

Post by Pete49 » Thu 05 Jul, 2018 2:02 pm

Today I went to start the 450SEL and nothing. It has fuel ( I checked lol) and spark to the cylinders (checked via timing light) but not a cough. In desperation I gave it a squirt of start ya bastard and it didn't even cough. (my wife turned the key and I squirted the stuff). Is there a relay or something that may be out? It was running a couple days ago, bit hard to start but did fire up and ran ok and with less tappet rattle. :) Just puzzling me.
Pete
1978 W123 300D Maple Yellow
1981 W123 300TD Classic White (now sold)
1983 W123 280TE Champagne
1975 W116 450SEL Silver blue

Pete49
Adenauer
Posts: 329
Joined: Thu 09 Oct, 2014 4:42 pm
Model you own: w123
Location: Pt Augusta Sth Australia

Re: Strange happenings

Post by Pete49 » Tue 10 Jul, 2018 1:48 pm

Further to this problem I checked the fuse box and all are good and all are copper :dance: I have put new fuel in and still no go. In the fuse box there are some relays (4 or 5) but I don't know if they are the problem or even how to test them. The fuel pumps are good. The only things not working on the dash are the clock and fuel gauge but can't see that being the problem as they didn't work before either.
Finding a suitable manual is also proving difficult. Where would I find out if the motor is original or replaced in this car and if it is a '78 motor or an earlier one.
Losing more hair daily,
Pete























i
1978 W123 300D Maple Yellow
1981 W123 300TD Classic White (now sold)
1983 W123 280TE Champagne
1975 W116 450SEL Silver blue

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AMG
OZBENZ Admin
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Re: Strange happenings

Post by AMG » Tue 10 Jul, 2018 1:59 pm

If you think it is a fuel issue, then:
in the reference library section, both d-jet and k-jet are covered.

for w116 body-specific tech and the same factory manual info we provide in the reference library section
get in touch with Michael Schlederer aka MForcer on this forum. He runs w116.org

https://www.w116.org/tech/

Consider giving thanks / donating to Michael's site if you find it useful, as he's a member on here and also runs w116.org free of charge, just like we run ozbenz
Current:
1987 560SL 4sp. auto Signalrot "Stella"
1987 190E 2.3-16 5sp. man. Blauschwarz "Hermann"
1992 300CE-24 6sp. man. Perlblau / Iceblau "Gretel"
1992 Range Rover Classic 4sp auto Ardennes Green "Oswald"
2012 E63 AMG Speedshift MCT Diamantweiß "Klaus"
Previous:
1986 560SEL Anthracitgrau "Schultz" - In Mercedes Heaven
1987 190E 2.6 4sp. auto Signalrot "Sabine" - which now resides/owns Andrew M's Garage
1972 350SLC Astralsilber "Lurch" - now in the loving care of Craig B
1989 2.5-16 Blauschwarz 4sp. auto (parted) formerly owned by Derek/Hasan.
2012 Renault Sport Megane RS265 Trophy 8:08 6 sp. man. Liquid Yellow "Jean Rédélé"

Pete49
Adenauer
Posts: 329
Joined: Thu 09 Oct, 2014 4:42 pm
Model you own: w123
Location: Pt Augusta Sth Australia

Re: Strange happenings

Post by Pete49 » Wed 11 Jul, 2018 1:17 pm

AMG I'm a member of the 116 forum but need to cover all bases as this is driving me crazy. Even a google search has let me down, surely this is not a rare problem?
Another thought is the fuel is not getting to the injectors but not sure how to test that theory yet. The search is ongoing and meanwhile I'll check the reference library.
Pete
1978 W123 300D Maple Yellow
1981 W123 300TD Classic White (now sold)
1983 W123 280TE Champagne
1975 W116 450SEL Silver blue

Pete49
Adenauer
Posts: 329
Joined: Thu 09 Oct, 2014 4:42 pm
Model you own: w123
Location: Pt Augusta Sth Australia

Re: Strange happenings

Post by Pete49 » Sun 15 Jul, 2018 1:40 pm

Mystery solved. When I removed the tappet cover I had to remove a hose and cable on the mudguard that came from a pump? to the back of the motor and the electrical plug wasn't pushed right in. While checking all connections I found it and made sure it fitted properly and hey presto it runs. Still have a tappet noise but a lot quieter than it was so back to it later.
Pete
1978 W123 300D Maple Yellow
1981 W123 300TD Classic White (now sold)
1983 W123 280TE Champagne
1975 W116 450SEL Silver blue

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