[VintageLambo] Re: 2000rpm stumble

Probably it"s something else but .... I created such a stumble in my Espada by leaning the idle jets. These jets are in effect during the progression phase.If you"ve never done any carb work and this is a new problem, odds are it"s something else or a combination of things.But if you get a minute to pull a jet I"d enjoy knowing what the number is (the jets are a friction fit in the bottom of the high brass screws right under the little cover on the top of each carb).I might have a set of richer jets that you could borrow to see if it helps.You can install the complete set of 12 in 20 minutes after a tiny bit of practice. I switched my jets about 5 times until I got the right balance between progression stumble and too rich (dark plugs).The place where I was buying them (Pierce Manifolds - Is this any relation to Mike Pierce I wonder?) has a "no return" policy of course and the numbers on the original jets that were in the car didn"t seem to make any sense when looking at the fuel and jet oriface drillings in the jets.So I had to start over with reference to a Weber manual and the displacement per cylinder. In my ignorance, the first set I ordered was so lean that the car would barely progress at all. I then moved up to where I am now, which is with a tiny lag right where you described your problem. If I have a richer set than yours you can try them and see if it helps you. You can then order them from Pierce and send my "test jets" back. The jets cost about 4 or 5 bucks apiece as I recall. Just a thought. Rex --- In VintageLambo@yahoogroups.com, "lamboguy " wrote: > --- In VintageLambo@yahoogroups.com, "nashbap " > wrote: > > Hello Roy: > > > > The stumble I referred to can best be described by an example- when > I > > am in second gear around 2000 rpm and suddenly depress the gas the > > car bogs down for about a second and then accelerates. Other than > > that the car runs extremely strong. > > Hi Nash, > > I emailed Mike Pierce and here is his response: > > >>There are several things that can cause this problem.The most > common is today"s oxygenated fuel.IF you have owned the car since > it was new, ask yourself did this occur when the car was new? > Regards, Mike > Mike is a very busy guy, and I"m honored to get any response at all! > Hope this helps a bit. > > Here is Mike"s site: > > http://www.piercemanifolds.com/yourwebers.htm > > Scroll to the very bottom of the page to enter his tech site.He is > probably the best Weber technican in the country.He"s just a few > miles from Burtoni (you can see Al on that page) and has an amazing > shop, filled to the raingutters with webers and parts. > > Boy, what I"d give to have some of these guys as regular contributors > to our site! > > Best, > > Fred