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Author Topic: Engine running rich  (Read 3084 times)

srisant

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Engine running rich
« on: July 22, 2016, 00:28:40 »
Hi I have got my engine overhauled and got overhauled fuel pump from Bud's Benz. Now engine seems to be running fine from before but I still have 2 problems. 1) engine start well when cold but more difficult when already warm 2) I use CO reading and I got 13.2 on idle which is way too high where it should be 3.5-4% as I was told. Can anyone suggest anything? I literally have change almost every parts that I can think off. It is quite frustrating to get it right when you are in Bangkok and there is no real specialist here for old cars.
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Tyler S

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  • USA, CA, Encinitas
  • Posts: 1613
Re: Engine running rich
« Reply #1 on: July 22, 2016, 01:38:29 »
It is runnng rich. Make sure the engine is at operating temp when measuring. If so, Click back the injection pump idle CO screw 1 click at a time with the engine off!!  Then restart and retest. Make sure your air filter is clean as a plugged air filter will cause high CO readings as well.
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1968 (67) 250sl. 4 speed manual. DB180 Silver
1955 220 Cabriolet A. White Grey
2019 E450 Wagon. Majestic Blue
1936 Ford PU Flathead V8. Creme on tan interior.
1989 Volkswagen T3 Westfailia Campmobile. Dove Grey (blue)

srisant

  • Guest
Re: Engine running rich
« Reply #2 on: July 22, 2016, 02:25:33 »
Let me try. Thanks
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ja17

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  • USA, OH, Blacklick
  • Posts: 7410
Re: Engine running rich
« Reply #3 on: July 22, 2016, 04:22:07 »
Make sure that the engine linkages are correct! Did you read "The Linkage Tour" ?
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Joe Alexander
Blacklick, Ohio
1969 Dark Olive 280SL
2002 ML55 AMG (tow vehicle)
2002 SLK32 AMG (350 hp)
1982 300TD Wagon turbo 4spd.
1963 404 Mercedes Unimog (Swedish Army)
1989 flu419 Mercedes Unimog (US Army)
1998 E430
1974 450SLC Rally
1965 220SE Finback

VincentR

  • Guest
Re: Engine running rich
« Reply #4 on: August 24, 2016, 10:21:27 »
Hello,
Check :
Linkage
Leaking injectors
Leaking pressure valves on IP
Cold start injection valve on manifold (with test light) and cold start valve sensor action (still in or out after start).

Best regards.
VincentR
280SL 1970
France
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srisant

  • Guest
Re: Engine running rich
« Reply #5 on: August 24, 2016, 10:29:52 »
After linkage fixed car runs perfect. Now have to sort out CSV. By disable it the car start much better.
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