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K-jet troubles - totally stumped, K-jet expert needed!

Started by raueda1, 29 July 2022, 10:24 PM

rumb

Does it feel rich or lean when it bogs?   What do the spark plugs look like after a bog situation?

Weak spark?
'68 250S
'77 6.9 Euro
'91 300SE,
'98 SL500
'14 CLS550,
'16 AMG GTS

raueda1

TICKET CLOSED.  ;D

What a horrible waste of time this was.  The last problem turned out to be simple fuel starvation.  At the beginning of this whole saga I discovered that the inline sieve-filter on the FD had collapsed on itself and was pretty clogged.  I replaced it with one from another FD  that had much freer flow. But maybe not free enough, or all the system disruption knocked loose a lot of particulate junk.  All that lead to the fuel pump, filter and WUR mysteries.  What seemed to happen during all that was that an extremely fine rust powder had severely occluded the fuel line FD filter.  So I was kind of going in a circle, solving one problem but creating another. 

Anyway, the car now seems to be better than ever. Thanks to all for ideas and support and tolerating my whining.  Maybe somebody can learn something from all this.  :o  It's good to be back on the road.  I was hoping to drive it to an MB club outing tomorrow and now it looks like I'll be able to.  ;D  Thanks again and cheers,
-Dave
Now:  1976 6.9 Euro, 2015 GL550
Before that:  1966 230S, 1964 220SE coupe, 1977 Carrera 3.0

raueda1

Quote from: rumb on 31 July 2022, 01:40 PMPerhaps start considering sending the WUR and FD to CIS Flowtech for testing and calibration?
i called them today in my darkest hour.  They're 9-12 weeks out!  wtf?
-Dave
Now:  1976 6.9 Euro, 2015 GL550
Before that:  1966 230S, 1964 220SE coupe, 1977 Carrera 3.0

revilla

I know it's too late, sorry been disconnected for some time, but that's why I apply a small deviation to the std written procedure when measuring system delivery volume: I mesure it 2 times; at the FD outlet first and after at the inlet and compare both to rule out FD internal blockage. The CIS KJet guide is great but in my experience it requires interpretation/understanding in so many different chapters, this one being an example. The good thing here is that the experience described will serve to other forum members in the future, and that's the spirit.
Robert
W116 1977 280SEL & 1979 280SE
[img width=150 height=100]http://revillagodfroy.com/MB%201977%20280%20SEL/album/thumbs/IMG_0371.JPG[/img]

UTn_boy

Quote from: raueda1 on 11 August 2022, 08:40 PM
Quote from: rumb on 31 July 2022, 01:40 PMPerhaps start considering sending the WUR and FD to CIS Flowtech for testing and calibration?
i called them today in my darkest hour.  They're 9-12 weeks out!  wtf?

They're that good.  It's worth the wait.   No one else in the U.S. can come close to how good they are at what they do. 
1966 250se coupe`,black/dark green leather
1970 600 midnight blue/parchment leather
1971 300sel 6.3,papyrus white/dark red leather
1975 450se, pine green metallic/green leather
1973 300sel 4.5,silver blue metallic/blue leather
1979 450sel 516 red/bamboo

raueda1

Quote from: UTn_boy on 12 August 2022, 09:42 PM
Quote from: raueda1 on 11 August 2022, 08:40 PM
Quote from: rumb on 31 July 2022, 01:40 PMPerhaps start considering sending the WUR and FD to CIS Flowtech for testing and calibration?
i called them today in my darkest hour.  They're 9-12 weeks out!  wtf?

They're that good.  It's worth the wait.   No one else in the U.S. can come close to how good they are at what they do. 
good perhaps but not perfect.  I got a rebuilt WuR back from them about 3 years ago.  It was all fine EXCEPT for fuel enrichment, which was about a 1.2 bar drop rather than 0.5 orso (coincidentally one of my recent problems).  Basically it didn't work.  By coincidence I had another working WUR.
-Dave
Now:  1976 6.9 Euro, 2015 GL550
Before that:  1966 230S, 1964 220SE coupe, 1977 Carrera 3.0

SteveDuNord

Quote from: revilla on 12 August 2022, 12:01 AMI know it's too late, sorry been disconnected for some time, but that's why I apply a small deviation to the std written procedure when measuring system delivery volume: I mesure it 2 times; at the FD outlet first and after at the inlet and compare both to rule out FD internal blockage. The CIS KJet guide is great but in my experience it requires interpretation/understanding in so many different chapters, this one being an example. The good thing here is that the experience described will serve to other forum members in the future, and that's the spirit.

Would the fuel inlet volume be higher than the outlet figure?
'77 280se

UTn_boy

Quote from: raueda1 on 13 August 2022, 10:47 AM
Quote from: UTn_boy on 12 August 2022, 09:42 PM
Quote from: raueda1 on 11 August 2022, 08:40 PM
Quote from: rumb on 31 July 2022, 01:40 PMPerhaps start considering sending the WUR and FD to CIS Flowtech for testing and calibration?
i called them today in my darkest hour.  They're 9-12 weeks out!  wtf?

They're that good.  It's worth the wait.   No one else in the U.S. can come close to how good they are at what they do. 
good perhaps but not perfect.  I got a rebuilt WuR back from them about 3 years ago.  It was all fine EXCEPT for fuel enrichment, which was about a 1.2 bar drop rather than 0.5 orso (coincidentally one of my recent problems).  Basically it didn't work.  By coincidence I had another working WUR.

We shouldn't let one mistake condemn them.  No company is perfect. 
1966 250se coupe`,black/dark green leather
1970 600 midnight blue/parchment leather
1971 300sel 6.3,papyrus white/dark red leather
1975 450se, pine green metallic/green leather
1973 300sel 4.5,silver blue metallic/blue leather
1979 450sel 516 red/bamboo

raueda1

Quote from: UTn_boy on 13 August 2022, 09:22 PM
Quote from: raueda1 on 13 August 2022, 10:47 AM
Quote from: UTn_boy on 12 August 2022, 09:42 PM
Quote from: raueda1 on 11 August 2022, 08:40 PM
Quote from: rumb on 31 July 2022, 01:40 PMPerhaps start considering sending the WUR and FD to CIS Flowtech for testing and calibration?
i called them today in my darkest hour.  They're 9-12 weeks out!  wtf?

They're that good.  It's worth the wait.   No one else in the U.S. can come close to how good they are at what they do. 
good perhaps but not perfect.  I got a rebuilt WuR back from them about 3 years ago.  It was all fine EXCEPT for fuel enrichment, which was about a 1.2 bar drop rather than 0.5 orso (coincidentally one of my recent problems).  Basically it didn't work.  By coincidence I had another working WUR.

We shouldn't let one mistake condemn them.  No company is perfect. 
That's true, and I don't.  Unfortunately my sample size is 1 and it was a dud.  And as it is, I'm back in business with the car.  So I'm gonna send it back and let them have at it again.
-Dave
Now:  1976 6.9 Euro, 2015 GL550
Before that:  1966 230S, 1964 220SE coupe, 1977 Carrera 3.0

Jan S

Quote from: SteveDuNord on 13 August 2022, 02:54 PM
Quote from: revilla on 12 August 2022, 12:01 AMI know it's too late, sorry been disconnected for some time, but that's why I apply a small deviation to the std written procedure when measuring system delivery volume: I mesure it 2 times; at the FD outlet first and after at the inlet and compare both to rule out FD internal blockage. The CIS KJet guide is great but in my experience it requires interpretation/understanding in so many different chapters, this one being an example. The good thing here is that the experience described will serve to other forum members in the future, and that's the spirit.

Would the fuel inlet volume be higher than the outlet figure?

If I understand your question correctly - yes.

The fuel supply from the rear assembly, if disconnecting the supply line from the FD, delivers maybe twice the amount (order of magnitude) compared to the return flow from the FD to tank. All due to the pump-curve -- less resistance leads to more flow and vice versa.
1975-mod W116 450 SE with 6.9 engine