302 engine issues.
Hotshot
Joined: May 2003
Posts: 11,141
Likes: 25
From: south louisiana
Might have better results changing the pump cam could be that cam is worn out. It should hesitate in all gears if the accelerator pump shot is off. You also need hose clamps on both sides of that filter.
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Elder User
Joined: Jun 2015
Posts: 664
Likes: 2
From: York Pa.
I have a orange pump cam, do you think I should try a different color? The filter is jammed in there hard and absolutely no chance of a leak. I don't even think I could pull the hose out if I wanted to.
Lead Driver
Joined: Sep 2003
Posts: 7,016
Likes: 209
From: SoCal
I had a stumbling problem with my 302 and Holley 4bbl after I assembled everything. I eventually found the accelerator to be sluggish. It turned out the diaphragm had gotten really stiff with age. If I watched the throttle bores while opening the throttle by hand, I see fuel being squirted, but it was hard to tell that there wasn't enough being squirted.
Hotshot
Joined: May 2003
Posts: 11,141
Likes: 25
From: south louisiana
The older Holleys had a ball bearing check valve retained by a thin strip of metal leading to the pump(s) this was replaced with a rubber umbrella valve. The older style would get corroded and/or crudded up slowing the flow of fuel to it. The diaphragm usually ruptures when it gets dried out, this and the PV diaphragm are the two parts in them that need changing after they've sat up for any length of time because of this.
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Elder User
Joined: Jun 2015
Posts: 664
Likes: 2
From: York Pa.
Hello again, I'm going to be buying a size 35 squirter tomorrow for my Holley carb. to see what it does for my hesitation issue, going up from a 31. I keep thinking about my timing, I'm set at 12 with total timing of 36 at 2700 rpms. I want to use the vacuum gauge and see if I can advance it further and hold a steady 20 vacuum. I also have my distributor vacuum hose attached to the manifold port. If I decided to hook the hose to the timed port do I have to readjust the distributor or do you just plug the hose into either manifold port or timed port and see which has better results?
Hotshot
Joined: May 2003
Posts: 11,141
Likes: 25
From: south louisiana
Hello again, I'm going to be buying a size 35 squirter tomorrow for my Holley carb. to see what it does for my hesitation issue, going up from a 31. I keep thinking about my timing, I'm set at 12 with total timing of 36 at 2700 rpms. I want to use the vacuum gauge and see if I can advance it further and hold a steady 20 vacuum. I also have my distributor hose attached to the vacuum port. If I decided to hook the hose to the timed port do I have to readjust the distributor or do you just plug the hose into either vacuum port or timed port and see which has better results?
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Elder User
Joined: Jun 2015
Posts: 664
Likes: 2
From: York Pa.
How did you set the timing in the first place ? Did you do it with the vacuum advance unhooked, or hooked up to the vacuum port on the intake ? To use the timed port on the carb (the nipple on the passenger side of the main metering block) unhook it, then set the initial timing then hook it back up. With it hooked to the intake, once you set it with it unhooked it's going to idle up the instant you reconnect the hose to the intake.
Lead Driver
Joined: Aug 2003
Posts: 6,305
Likes: 18
From: Boulder Creek, Ca
The 289/302 in my 65 has the Holley 1850/4160 carb where the advance operates off secondary vacuum. In my case, does not require blocking the line from metered port to distributor; although does not matter if I do. I set idle mixture then adjust timing at around 10 degrees and I am done, hit the start and zoom-zoom. Vac. gauge runs at constant 18. Drove the truck for few hundred miles and pull plugs to find running a bit rich, went from 67 jets to 65 and seems to run cleaner. Anyhow that is how I have been tuning the engine over these many years.
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Elder User
Joined: Jun 2015
Posts: 664
Likes: 2
From: York Pa.
The 289/302 in my 65 has the Holley 1850/4160 carb where the advance operates off secondary vacuum. In my case, does not require blocking the line from metered port to distributor; although does not matter if I do. I set idle mixture then adjust timing at around 10 degrees and I am done, hit the start and zoom-zoom. Vac. gauge runs at constant 18. Drove the truck for few hundred miles and pull plugs to find running a bit rich, went from 67 jets to 65 and seems to run cleaner. Anyhow that is how I have been tuning the engine over these many years.
Lead Driver
Joined: Aug 2003
Posts: 6,305
Likes: 18
From: Boulder Creek, Ca
Thanks daveenglelson for your input on how you tune your engine. I bought my size 35 squirter today and hopefully that helps with the hesitation. I am also going to try to advance my timing further just to see what type of effect it has. Do you know what size squirter your carb has?
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Elder User
Joined: Jun 2015
Posts: 664
Likes: 2
From: York Pa.
Going thru receipts and came across rebuild kit but in reviewing item description does not mention the nozzle size or type, I have requested information from supplier for the information. I do recall decided to replace the original straight type nozzle for the 'squirt type' and the receipt shows that it was for an 025 nozzle; having said that, I was going thru my trial and error phase and not clear what size nozzle I decided to settle on? If needed, and time permit I will pull the nozzle and check the size.