car still in shop...

[Guest Anonymous]

URL: http://cruiserco.com/lance_hawkins_fj40.htm

I took my car to a new shop and they are still a bit baffled by the

problem. As I posted before, the car misses at higher rpms. Now

it revs great and you can't even tell anything is wrong until you

take it for a drive. Under load is the only time it really cuts out.

The mechanics put in a tii distributor with points and condenser

with a blue coil and the problem still persists. I went through the

carbs and cleaned all the jets and made sure nothing was gunked

up. Also made sure idle mixture and side-to-side adjustment for

the dual 45s was right. I guess all indications point to something

in the motor. Hopefully the mechanics will figure it out tomorrow,

but does anybody have any clue what the hell is going on?

thanks again,

dewar

p.s. pictured is my roommates car that i am riding around in until

mine is fixed. 66 fj40 with a vortec 350...awesome. link shows

complete conversion that po did

[Guest Anonymous]

(nt)

[Guest Anonymous]

(nt)

[Guest Anonymous]

URL: http://store.summitracing.com/productdetail.asp?p=309

With this Volvo B-20 that i built with cam ported head and duel

40's. I was trying to get by with the mechanical fuel pumf figuring

that the pressure might be low but the flow would be ok since the

car originally had duel SU's. I recently installed a Carter P4070 (49

bucks at Summit racing) fuel pump and it cured all the problems I

was having sorting out the webbers. I have heard that you should

use this pump only with side draught Webbers , and that the little

Facit type vibrating pump is just not sufficent. I used to think this

was bull because the last motor I had in my 02 used the same

40's and a Facit type electric pump. But now that i look back at it I

did have a stumble intermitently above 6500 RPM. I'm sure i

wouldn't have had the problem with the Carter 4070.

Highly recomended!

http://store.summitracing.com/productdetail.asp?p=309

john

[Guest Anonymous]

Revving in neutral opens the throttle very shortly and

requires little fuel. Opening the throttle under load requires a

lot more. The fact that the mixture is correct at idle is no

guarantee it will be right under load. I suggest rolling-road

session, or fit a lambda sensor with readout for starters.

Good luck,

Hugo

[Guest Anonymous]

tried substituting new spark plug terminals--the long bakelite things? They've been known to go bad since they have radio suppression resistance built in... Just a thought. But it does sound like high-speed fuel starvation...

Mike

[Guest Anonymous]

ya gotta figger out which!

I use the cheap 02 sensor setup- if it's spark, it'll stay happy, with maybe a quick stutter in ratio.

If it's carbs, the mix will go massively lean (or maybe rich) but it will do so over a longer period of time.

Then you can diagnose from there.

The electrical faults will 'usually' be more abrupt than the carbs, but I had a partially- failing condenser once that felt EXACTLY like a mid- throttle lean- out...

fwiw,

t