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6.9 K-jetronic rough and high idle cold start

Started by Jan S, 10 June 2021, 05:36 PM

Jan S

Found a few leaks with the smoke machine, relatively easy. I guess it's among the usual suspects.

Leak 1-4 will be easy to fix. The two larger rubber parts - in and out aux air valve - I already have. Need to buy the 4mm and 5mm leak lines. And maybe the two small rubber parts on WUR.

Leak 5 will be a bit more challenging. The rubber hose with part number 100 090 01 82 is not easy to find? Any tips?

The injectors incl. seals are new and they looked fine. But I expect more leaks under the air intake.

The hunt continues as soon as the new "smoke machine" is in place.
1975-mod W116 450 SE with 6.9 engine

daantjie

#46
Yup I would say that "100" hose will be a challenge for sure.  Likely NLA from Benz.  If the hose is still pliable you can try and put a hose clamp on that connection but likely it's rock hard from getting baked by engine heat.
Daniel
1977 450 SEL 6.9 - Astralsilber

rumb

Might be real, might not:

https://www.eggmalltech.com/en/products/details/1389234.html

Somewhere in Thailand.
'68 250S
'77 6.9 Euro
'91 300SE,
'98 SL500
'14 CLS550,
'16 AMG GTS

ptashek

It's listed as available, and costs around 65EUR at Mercedes.
1993 "Pearl Blue" W124 280TE
1988 "Arctic White" W124 200T
1979 "Icon Gold" W116 450SE

Jan S

Fantastic, thanks to all of you!

I will check with MB on Monday.
1975-mod W116 450 SE with 6.9 engine

Jan S

Called MB today. The part is NLA.

Tomorrow I will call Mercedes Classics Center, last resort, before I start assembling a solution based on several individual hoses (elbows, reducing elbows, straight, etc.), will be a puzzle.
1975-mod W116 450 SE with 6.9 engine

rumb

Quote from: ptashek on 12 February 2022, 02:33 PMIt's listed as available, and costs around 65EUR at Mercedes.

https://partssearch.mercedes-benz-classic.com/parts/A1000900182?tt=automatic

Says no longer available.
'68 250S
'77 6.9 Euro
'91 300SE,
'98 SL500
'14 CLS550,
'16 AMG GTS

ptashek

That's a pity then. Hopefully you can get around it.
1993 "Pearl Blue" W124 280TE
1988 "Arctic White" W124 200T
1979 "Icon Gold" W116 450SE

Jan S

Disassembled the "100 090 01 82" hose today.

47 years old, hard as stone. No wonder there's a vacuum leak at that hose.

The hose is NLA, need to find a solution. I guess I will use several hoses with clamps. We'll see....
1975-mod W116 450 SE with 6.9 engine

daantjie

I'll be following your progress with this hose for sure.  Can you do this with the fuel distributor and other crap in the way?
Daniel
1977 450 SEL 6.9 - Astralsilber

rumb

If the hose is still solid you could try using plumping teflon tape on the fittings.
'68 250S
'77 6.9 Euro
'91 300SE,
'98 SL500
'14 CLS550,
'16 AMG GTS

Jan S

Quote from: daantjie on 26 February 2022, 01:39 PMI'll be following your progress with this hose for sure.  Can you do this with the fuel distributor and other crap in the way?

I had to remove 2 hard fuel lines on the right side, to get access. Relatively easy to remove, with all the rest in place.
1975-mod W116 450 SE with 6.9 engine

Jan S

Quote from: rumb on 26 February 2022, 02:10 PMIf the hose is still solid you could try using plumping teflon tape on the fittings.

Thanks for the tip, rumb. The hose is beyond repair - I need to find new hoses. A fix for the long-run.
1975-mod W116 450 SE with 6.9 engine

Jan S

Quote from: Jan S on 26 February 2022, 04:25 PM
Quote from: daantjie on 26 February 2022, 01:39 PMI'll be following your progress with this hose for sure.  Can you do this with the fuel distributor and other crap in the way?

I had to remove 2 hard fuel lines on the right side, to get access. Relatively easy to remove, with all the rest in place.

... and remove the fuel supply line to FD.
1975-mod W116 450 SE with 6.9 engine

Jan S

Still working on the vacuum leak. 5 leaks found.

New rubber boots, new vacuum lines, etc. ready to be installed. And gave the aux air valve. the idling house and bolts a thorough clean.

Waiting for 1 hose to arrive, and working on the solution for the "100"-hose.
1975-mod W116 450 SE with 6.9 engine