Weber 38 Probs

[cameljockey]

Okay so i havn't posted for a really long time (but i've been watchin some wonderful things going on) and i also haven't driven my car for a long time ('66 ford mustang 200 ci 6) bottomline school and life in general got really busy but my summer school is finally over and i figure i'll dive right in with some carb issues.

I hadn't driven the car for a while so i changed all the fluids from the oil in the engine to the gas in the tank. disassembled and cleaned my carb (Weber 38 DGES w/ electric choke) and added a fuel pressure guage which now reads a healthy and constant 6 psi. I did some research and found that these carbs like something around 2-3 psi so 6 psi is to high right but that shouldn't keep it from running should it : i even changed the plugs and they're always covered with a reddish brown my local parts place told me that's normal but me thinks it's a little lean

other thing i noticed is that when it's cold the engine fires right up and purrs like a kitten i was even able to lower the idle speed and adjust the timming to that specified in the chiltons manual. BUT as the engine warms up and the choke plates open the engine starts to die! So i hold them part way closed and the engine picks back up! I've also looked for vacuum leaks and did a compression leak down test and come up with bup kiss!
Please help I'm at my witts end :x

in the mean time i have ordered a fuel pressure regulator which will be here tomorrow and installed just as soon.


Thank's guys and Keep sixin'

 

[addo]

The reddish brown colour on your spark plugs, is from MMT, a fuel additive. Since the loss of lead from fuels, and the increasing of additive packages, it's all but impossible to "read" plugs as once was done.

 

[Stubby]

It sounds lean. You have ruled out a vac leak. I would examine the idle circuit.

How many turns out on the idle mixture screw? (recomended 1 1/2 to 2)
How many turns in on the idle speed screw? (recomended approx 3/4)

The excessive pressure should cause a rich condition. After reducing the fuel pressure, you might have to adjust the float level.

 

[falcon fanatic]

go to weber.com and download the "lean best idle adjustment" sheet.

 

[HighVolkage]

i had some problems getting my webers to idle, turned out to be too much fuel pressure (~7 psi i think) but i turned the regulator down and now it idles like a dream. 8)

i'd try that before you dig into anything else

 

[falcon fanatic]

Yep, a cheap pressure regulator from Autozone will do the trick. I run mine at 3psi.

 

[cameljockey]

Thankyou all for comming to the swift aid of an IDIOT
(That's ME) :x :x :x

I added the regualtor and that marginally improved things so i decided to try and hunt for vacuum leaks again and low and behold a leak manifested itself when I buttoned up everything and sprayed carb cleaner at the base the idle picked up so I will replace the gaskets tomorrow and hopefully i won't be posting again

Thanks again and keep sixin'