stumble

[ddettloff]

Mild build 318 when launched at 4500 it falls on face sounds and feels like its running on just a couple cylinders.
I just noticed a slight miss at higher rpm.
On launch when it stumbles it will regain power after backing off gas pedal then pushed to floor takes off at a loss on what it is.
Replaced coil and put on orange box still same results.
Have one cylinder that is a little oily on plug and running lower compression than other 7 by about 30 lbs.
Any ideas.

 

[charger426]

My 5th ave with lean burn does the same thing... How fresh is the carb?

 

[70aarcuda]

check the floats...make sure one is not hanging up....

check the accelerator pump...that is squirting gas as soon as the throttle blades move...

what size are the squirters....

timing?.....

 

[ddettloff]

carb is a 1406 eddy about 6 mo old pump shot seems fine fuel delivered as soon as pedal depressed
Timing set at 20 inital

 

[charger426]

I wouldn't think the accelerator pump would need to be replaced after only 6 months of use (assuming low ethanol fuel used or fuel additives to help stop the effects of ethanol on the fuel system). But I could tell a night and day difference this weekend after doing a rebuild on my swinger. Granted its only a 1 barrel but everything looked good when hitting the gas (squirters had good flow) but it seemed to die when I pushed the gas. $35 in a rebuild kit, like $20 in a gal pal of carb clean to soak everything in and about an hour taking it apart and putting it back together gave me a brand new car.

 

[ddettloff]

I just tried to adjust air fuel mixture turned screws in all the way the right side did not have any effect on car , guess must be dirty will start with carb rebuild