Another hesitation issue !!!!!
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Laughing Gas
Joined: Jul 2003
Posts: 884
Likes: 13
From: Bassett Virginia
thanks guys. Like I said, I tightened it up a couple of turns but I still remember checking to see if it was spraying when I started to move the throttle and it wasn't spraying as soon as the throttle started to move. Maybe the pump arm is bent slightly???? I will look at it again this weekend and see what's going on. Where do you put the washer? Do you unscrew the top lock nut and put it there and tighten her back up? Just in case I can't get it to work the other way if course!
Posting Guru
Joined: May 2010
Posts: 1,867
Likes: 3
From: Alton, MO
Something that may sound odd is I had a hesitation in my Holley carb on the old 302. I went through this when doing my suspension swaps. The heavier the rake the worse it was. In any case I found resetting the floats did wonders. Doesn't make any sense but it worked. I too would be looking at the accelerator pump but if you have gone that route you might check the float levels. It is a simple & quick thing to do.
Lead Driver
Joined: Aug 2003
Posts: 7,592
Likes: 10
From: **** hole San Jose ca.
thanks guys. Like I said, I tightened it up a couple of turns but I still remember checking to see if it was spraying when I started to move the throttle and it wasn't spraying as soon as the throttle started to move. Maybe the pump arm is bent slightly???? I will look at it again this weekend and see what's going on. Where do you put the washer? Do you unscrew the top lock nut and put it there and tighten her back up? Just in case I can't get it to work the other way if course!
Okay remove lock nut pull down the threaded screw enough to put in the washer on top of spring then push back up through lever arm replace lock nut. Most small washer are about 0.25 Then re-check the 0.15 at WOT
The 0.15 gap is so you don't damage the acc-pump diaphragm. But you want as much pump shot though with no play in the spring at idle. A pump spray as soon as it moves to open the throttle. Keep adjusting till you get this correct and this should tune out the flat spot! If not I have a lot of extra main jets pump shot shooters 025-0.28-0.31. and some pump cams I'll give to you. I've been using a ad just a jet setup for a few yrs, just dial in the jet size with a screw-driver
PM me if you want some..orich.
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Laughing Gas
Joined: Jul 2003
Posts: 884
Likes: 13
From: Bassett Virginia
Crap! Oh OK. I will look this weekend mike, thanks! I was getting so frustrated with it I was even thinking about it...... I might need a pump cam to make it shoot a little quicker. Also willing to try some jets. PM sent, thanks!
Lead Driver
Joined: Aug 2003
Posts: 7,592
Likes: 10
From: **** hole San Jose ca.
Here's a link to help you understand what's going on with the pump cams
and how to set them up..
Carburetor Accellerator Pump Cams Video - Holley Carb DVD - YouTube
and how to set them up..
Carburetor Accellerator Pump Cams Video - Holley Carb DVD - YouTube
Logistics Pro
Joined: Jan 2011
Posts: 4,762
Likes: 54
From: Antelope Valley ,CA
william just reread orig post
on bottom back of holley is a big vacuum port are you using it ? alot of people miss this port when installing the carb and leave it open causing a vacuum leak.
10-11 hg vacuum sounds like you have a vacuum leak
on bottom back of holley is a big vacuum port are you using it ? alot of people miss this port when installing the carb and leave it open causing a vacuum leak.
10-11 hg vacuum sounds like you have a vacuum leak
Lead Driver
Joined: Jan 2003
Posts: 9,893
Likes: 12
From: Ohio
Just a note, I've seen the arm get bent on these carbs, leaving too much slop to adjust the nut/bolt for. I just grab the arm with a couple pairs of needlenose pliers and "tweak" it straighter again. Removing the cam might give you more room to bend it. The arm that rides on the cam should be pretty straight. If it has a curve to it, then it's been bent up.
You shouldn't have to add a washer to the nut/bolt on arm to get enough travel. That's a bandaid fix for the arm being bent.
You shouldn't have to add a washer to the nut/bolt on arm to get enough travel. That's a bandaid fix for the arm being bent.
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Lead Driver
Joined: Aug 2003
Posts: 7,592
Likes: 10
From: **** hole San Jose ca.
I guess it's any one's fix the way choose or not to as the right way.
But point is, Not all pump lever cam arms are made of stamped steel.
A form black type of plastic was used also on Holley's too. It may break being screwed. ..http://www.google.com/url?sa=t&rct=j...mpZXKRF9q_-xiA
tuning tips for a holley http://v8tvshow.com/content/view/110/28/
orich
But point is, Not all pump lever cam arms are made of stamped steel.
A form black type of plastic was used also on Holley's too. It may break being screwed. ..http://www.google.com/url?sa=t&rct=j...mpZXKRF9q_-xiA
tuning tips for a holley http://v8tvshow.com/content/view/110/28/
orich
Lead Driver
Joined: Jan 2003
Posts: 9,893
Likes: 12
From: Ohio
Oh ya, forgot about the latest, greatest version they have out with plastic arm. PITA. Then you don't have much choice in the matter, but like you mention it should break instead of bend.
I avoid any of the newer plastic parts on Holleys. All my junk is antique versions.
I avoid any of the newer plastic parts on Holleys. All my junk is antique versions.
Thread Starter
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Laughing Gas
Joined: Jul 2003
Posts: 884
Likes: 13
From: Bassett Virginia
Mine does have a mild cam so I know my vacuum will be lower than stock, but my question is how much lower? Is 10-11 too low????? My truck also has power brakes.
****Mine is not plastic, so no worries there. I will check out whats going on with it this weekend and post back then.
Cargo Master
Joined: Oct 2011
Posts: 2,246
Likes: 303
From: Kenner,La.
hesitation- stumble
W-W, get some vacuum hose and rig it up inside the cab and drive with a vacuum gauge watching how much vacuum is showing at the point where it really acts up. Hopefully it does not go to zero. If it does then you have a serious reversion problem, if it still shows vacuum Holley has several power valves with a lower opening . The valves have a stamping showing their opening. If you contact Holley they will want to know what camshaft you have and will be able to tell which power valve you need. Good Luck Kenny Nunez
Thread Starter
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Laughing Gas
Joined: Jul 2003
Posts: 884
Likes: 13
From: Bassett Virginia
OK, loosened the adjusting screw off at the pump and now she is squirting once the throttle moves. I think I may be having a problem with my modular valve so I started another post. you guys please chim in on your opinions. Thanks!
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