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Hey y’all. I have an 84 carbureted f150 with a 302. I rarely ever floor it. However, today I noticed if I floor it the trans doesn’t really kick down and acceleration is slow. I accelerate way faster if the pedal is half way to 3/4. But once I hit full it doesn’t really go anywhere. If I give it full throttle from a stop or very low speed (say like 10mph) it’ll accelerate relatively slowly and once it hits about 45, it stops. It doesn’t cut out or die, it just stops accelerating. If I give it full throttle already in top gear it will accelerate, but extremely slowly.
any ideas? Is this a kick down issue or more of a fueling/carb issue? Maybe a combination of both?
First thing to check is the accelerator pump on the carb. Look down the carb and open the throttle and see if a solid stream of gas is going down the throat of the carb. You have to open the choke plate if closed to see. If you don't see a solid squirt you should rebuild the carb.
First thing to check is the accelerator pump on the carb. Look down the carb and open the throttle and see if a solid stream of gas is going down the throat of the carb. You have to open the choke plate if closed to see. If you don't see a solid squirt you should rebuild the carb.
Yep! That’s all good. I get nice squirt from both sides.
Take the aircleaner off, open the choke door if it's in the way and then get someone to hold the pedal to the floor. With a flashlight look down the carb throat. Are the throttle blades in the bottom of the carb sitting straight up and down? Lots of things can interfere with this such as carpet and throttle cable needing adjustment as it gets older the the cable stretches a little bit.
Hey y’all. I have an 84 carbureted f150 with a 302. I rarely ever floor it. However, today I noticed if I floor it the trans doesn’t really kick down and acceleration is slow. I accelerate way faster if the pedal is half way to 3/4. But once I hit full it doesn’t really go anywhere. If I give it full throttle from a stop or very low speed (say like 10mph) it’ll accelerate relatively slowly and once it hits about 45, it stops. It doesn’t cut out or die, it just stops accelerating. If I give it full throttle already in top gear it will accelerate, but extremely slowly.
any ideas? Is this a kick down issue or more of a fueling/carb issue? Maybe a combination of both?
Sounds like it could be a kick down issue. What trans is in it AOD or C6? A pic of the carb, throttle side would help...
What is the history of the acceleration no kick down issue? All of a sudden it started or did it get worse over time? Also when was your last tune up?
I rarely give it full throttle to begin with. So to say its gotten worse over time I can’t really say for sure. I do know previously if I’ve had to floor it, I do recall it kicking down and accelerating.
I just changed the oil, and all the distributor parts, plugs, wires are new.
Here’s a photo of the throttle linkage side of the carb.
upon suggestion I made sure the pedal was down and took a flash light to look down the carb to see if the throttle butterfly’s were opening fully. They are not. With the pedal fully depressed the throttle plates were open about 1/2-3/4 open. Makes a lot of sense now.
Oh brother an Edlebrock and Lokar No wonder you are having issues. Regardless you need to back off the nits circled below and unscrew the cable sheath to tighten the accelerator cable. This should give you more throttle travel. As for the kick down don't even know where to begin there. No idea what kind of cluster they have set up for the kick down.
Oh brother an Edlebrock and Lokar No wonder you are having issues. Regardless you need to back off the nits circled below and unscrew the cable sheath to tighten the accelerator cable. This should give you more throttle travel. As for the kick down don't even know where to begin there. No idea what kind of cluster they have set up for the kick down.
haha! That’s the way I got it. I’ve tried adjusting those little nuts a bit. I figured it would be like adjusting my bikes throttle cable. But even with it fully out it still doesn’t open up fully.
as far as the kick down, if I open the throttle by hand, at the carb, I can see that it pulls the kick down. So I’m thinking it’s really a throttle cable adjustment and the kick down isn’t engaging because it’s not getting far enough to actually pull it.
Can you take a drill bit and open that smaller hole up in the throttle arm below where it is now? That would move it forward, so you would have to loosen the cable, but that would give you a little more travel and it would also put it closer to the throttle shaft which would also give more movement. It will make the throttle more sensitive also, so you would have to try it. If it didn't work just simply move the ball stud back up to where it was before.
Can you take a drill bit and open that smaller hole up in the throttle arm below where it is now? That would move it forward, so you would have to loosen the cable, but that would give you a little more travel and it would also put it closer to the throttle shaft which would also give more movement. It will make the throttle more sensitive also, so you would have to try it. If it didn't work just simply move the ball stud back up to where it was before.
aaah! I see what you’re saying. I’ll definitely consider it. Looks like it’ll be a no harm no foul situation. Thanks for the suggestion
aaah! I see what you’re saying. I’ll definitely consider it. Looks like it’ll be a no harm no foul situation. Thanks for the suggestion
So sounds like you do not even the have the clearance to get full throttle. Then Daves suggestion is the way to go move the mounting location of the ball stud forward. This will do 2 things make the available travel longer but also change the ratio so less pedal movement will result in more throttle movement. That should fix it up.
Also, just curious any chance the cable lock has backed out of the ball stud socket? That may have been the issue also.
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