cuts out when I floor it

t-west

t-west

Well-known member
Hi all,

Hot or cold, choke or no, when I floor it from either a stop or while moving, the car cuts out like it's starved or something. I can accelerate moderately, but when I punch it it chugs.

I have a H/W from Stovebolt (2 mo.s old) w/ his adapter and I'm guessing that something is happening when the second barrel opens quickly. The linkage looks good, and I'm running a new DSII w/ Flamethrower coil, stock module, timing seems good.

Could my jets be that far off? Is my fuel pump unable to handle the load? Any other adjustments?

thanks,
--tom
 
Sounds more like a bad coil wire or distributor cap/rotor problem. To test, put the whole family and all your friends in the car, head up a steep hill in high gear at 35 mph and gradually step on the gas. An ignition problem will show up pretty quickly under heavy load/low speed. If it's just an accelerator pump problem and the ignition is ok it will lug fine as long as you don't open the throttle too quickly. If it's an automatic, unhook any kickdown linkage to do this test.
Joe
 
The coil, cap, rotor, dizzy, and wires were all new when I installed them about two months ago. I've just now started to drive it around, and so I'm just now noticing the problem. I'll check those out, but I'm betting they're fine.

The reason I'm wondering about the carb has to do with the way I have to floor it in order for it to do this. I also remember reading somewhere that occasionally H/W 5200's from Stovebolt have the same size primary and secondary jets, and for some reason this is a problem in our motors. I may just pull the jets to get their numbers down on paper.

Any other ideas?

--tom
 
I think the jets on mine are marked 170 and 185, so they are not necessarily the same size. Don't know about Stovebolt's, but if you gave 'em a call he might have some suggestions. Can you look at the plates and rev the engine up and see if there gas going in the secondary?
 
Could be the float in the carb. Smell the plugs after it bogs, right after, and if theyre fuel soaked, you got a float or choke (I know youre denying it) problem.

Could also be extremely lean, thats the first thing to figure out...too rich, or too lean.

I can almost bet its a rich condition. Have someone drive behind you and gun it, signal him/her with a hand up when you do, and have them pay attention what comes out of the tailpipe. Black=too rich.

Did you tune the idle air screw after installing? All the way in, one and a half turns out.

A slight movement of the choke can change tha A/F ratio....and so can weather changes, cooler outside etc.
 
HI
I'd say check the vacuum advance.. sounds like at wot your getting to much timming.. check idle timming then check full timming watch the timming as you incress speed. Maybe un-hook and plug the vacuum advance, take it for a ride and see if it helps.
tim
 
Here's what I've done so far: bought a timing light and "lowered" my timing to 14* (from up around 20* where it was) w/out the vacuum hooked up. Then I set the idle on my 5200 to about 1 1/2 turn in, my mixture started at 2 turns out, then I pulled it out another 2 turns to where it was idling smoothly. I then lowered my idle screw nearly 1 full turn and took if for a drive.

Bogs down even more now when I floor it than it did before.

Tried it without the vacuum advance (plugged it with a screw) and still bogs. I checked the two jets that you can get to easily (idle jets?). The primary says 80 and the secondary says 10 (or maybe it's 01?).

Any new advice based on this?

thanks in advance for your help.

--tom
 
Checked all the jets today and something seems screw-y.

Primary main: 132
Secondary main: 135
Primary air corrector: 180
Secondary air corrector: 195
Primary idle: 10
Secondary idle: 80

I'm not sure why some numbers are 10 and some 180 -- are there two different measuring systems at work? Also, just to verify, I assume that the secondary valve is the one that opens last.

At any rate, I know my idle is too small -- my screw is backed out about 4 turns. From this post: http://fordsix.com/forum/viewtopic.php?t=23153 I gather that I might need to make the following adjustments:

Change the primary idle (from 10 to 75)
Change the secondary idle (from 80 to 65)

Change the primary main (from 132 to 160)
Change the secondary main (from 135 to 160)

Change the primary air (from 180 to 185)
Change the secondary air (from 195 to 175)

Change the Pump Jet from a 3(?) to 60.

Until these jets arrive, should I switch things around so the primaries are bigger than the secondaries? Also, in an effort to save money, I'm going to reuse those jets that are close. If any of this is a terrible idea, please let me know.

Finally, my pump jet looks sealed off to the secondary. Is this normal? Because of the design it looks like it should be open, but maybe I'm not clear about its function.

best,
--tom
 
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