DCOE equipped E-Type popping and farting excessively

[ianc9]

Finally got the car back from the Weber specialist. It's now ticking over sweetly and pulls nicely from idle (remember is has 32mm chokes - so should be good low down). It behaves well around town where revs rarely go over 2500.

However on open road at anything above 2500 and on light steady throttle it is missing and stumbling a lot.
Give it a small amount of additional throttle and it will clear the misfire - but then I'm heading to illegal speeds :).

In normal circumstances I would just bring it back to the "specialist" but my experiences of of them has been very poor.
- Initially they misdiagnosed the problem as poor compression - because they measured it incorrectly!
- They handed the car back to me "All fixed" only for me to discover 3 of the air correction jets to be missing!
- They left my E-Type outside in the rain even though I told them it was letting in water (Not related to the problem but just shows poor service)
And since they don't have a rolling road I cant see them getting to the bottom of it.

I'm really frustrated.

Does anyone have a recommendation of a Weber specialist in Ireland?

[Mich7920]

Hi Ian,
I don't think you have any particular interest in keeping your Webers.
As you don't know how to set up them, forget them !
You'll be frustated all the time and it's not at all what the driving experience of an E-Type does .
SOLD them and buy a set of SU with all the accessories and you'll re-discovered BIG smile.
Mich

[ianc9]

Hi Ian,
I don't think you have any particular interest in keeping your Webers.
As you don't know how to set up them, forget them !
You'll be frustated all the time and it's not at all what the driving experience of an E-Type does .
SOLD them and buy a set of SU with all the accessories and you'll re-discovered BIG smile.
Mich

I think the 3 pages of posts here show I am interested in getting them to work.
I do know the methods for setting them up and have done so a number of times on 70s and 80s Alfas without problems. I admit I do not have much experience in making them work on an XK.

My frustration is with the "Experts" I have engaged with so far (one in each of England, Ireland and France) who have "talked the talk" but have proved to be far from experts. Hence my ask here for recommendations.

A set of SUs will cost more than €6,500. I think I'd consider fuel injection if spending that much.

[44DHR]

Ian,
My apologies for not coming on here earlier to comment.
I have run triple Weber’s on my car for over 20 years - including some long European runs, into thousands of miles - with no issues or even having to change my settings.
Just go onto my “profile” on this forum and search “Weber” to see my relevant posts and my set up on the car. I am willing to send you my specific Weber settings - as I have done for others on here - if you send me a PM - to give you a view. However, be aware the you can’t just look at all the various settings in isolation and expect them to suit all 4.2 XK engines, but need consideration of the rest of the engine, such as in terms of the head - it’s work and valve gear - the exhaust and the ignition being used.

As a quick observation, you mention that you are running 32mm Chokes, (Post #41 “so should be good low down”), but I have alway run 38mm chokes without any problems on the road and occasional track use. I did note Christopher’s observation at Post #2 on his views on choke sizes.
Another observation - simplistically- is that “popping” often occurs on the overrun as unburnt fuel is drawn into the hot exhaust - depending on the exhaust construction material - especially with Stainless Steel.
Back to basics, it is crucial that the three throttle butterflies are perfectly aligned and matched to uncover the drilled progression circuit holes. These holes must all match - in number, drill size and position - and this is where I get the biggest number of issues with people’s Weber’s “stumbling” as the engine does not have a smooth transition from the idle circuit to the main circuit as the butterflies uncover these holes in sequence.
Just PM me if I can help.
Regards,
Dave

[ianc9]

Thanks Dave for this response.
I've sent a PM

[44DHR]

Ian,
I have opened your PM thanks.
I have done some replies with all my detailed Weber settings and then also included my valve and ignition timings.
The messages are just sitting in my “Outbox”.
I’m not sure if I have to do anything else or if they disappear from my Outbox once you open them.
If you could check your end please ?
Regards,
Dave

[ianc9]

Ian,
I have opened your PM thanks.
I have done some replies with all my detailed Weber settings and then also included my valve and ignition timings.
The messages are just sitting in my “Outbox”.
I’m not sure if I have to do anything else or if they disappear from my Outbox once you open them.
If you could check your end please ?
Regards,
Dave

haha! I liked the first reply most :) Will be in touch