OK.
My 65 coupe with a stock 289 misfires and then dies at higher RPMs while driving, especially over 55. It'll start back up and maybe misfire, maybe be fine in park, but once in gear, it'll give me hell until I get home. Here is what I have and have done:
New Edelbrack 500 cfm carb
New Carter fuel pump
New fuel filter
New PCV
Re-routed fuel lines from engine to reduce heat
Replaced fuel lines from pump to carb
Tried with and without fuel pressure regulator
Pertronix Ignitor ignition
New distributor cap and rotor
Tried with and without vacuum advance
None of this has helped. It does this hot or cold, day or night, every time. So I think I have one of two problems:
1) Not enough fuel (despite the new pump)
2) Exhaust restriction (despite new exhaust)
I know you can hook up a vacuum gauge to check for an exhaust problem. What will happen to the vacuum if there is a problem? Too low? Too high? As far as the fuel pressure goes, I know too little pressure will cause the engine to run dry. All I have is a vacuum gauge/fuel pressure gauge contraption. Can I use this? Will enough volume pump through despite the tiny line needed to hook up the gauge?
I plan on checking both late this weekend beginning with the vacuum test (because it smells funny when it breaks down). Any numbers or trends to look for would be greatly appreciated. I am dying to drive this thing, but its starting to make me really mad after four weeks and about a thousand bucks into it. Thanks much for any suggestions!
My 65 coupe with a stock 289 misfires and then dies at higher RPMs while driving, especially over 55. It'll start back up and maybe misfire, maybe be fine in park, but once in gear, it'll give me hell until I get home. Here is what I have and have done:
New Edelbrack 500 cfm carb
New Carter fuel pump
New fuel filter
New PCV
Re-routed fuel lines from engine to reduce heat
Replaced fuel lines from pump to carb
Tried with and without fuel pressure regulator
Pertronix Ignitor ignition
New distributor cap and rotor
Tried with and without vacuum advance
None of this has helped. It does this hot or cold, day or night, every time. So I think I have one of two problems:
1) Not enough fuel (despite the new pump)
2) Exhaust restriction (despite new exhaust)
I know you can hook up a vacuum gauge to check for an exhaust problem. What will happen to the vacuum if there is a problem? Too low? Too high? As far as the fuel pressure goes, I know too little pressure will cause the engine to run dry. All I have is a vacuum gauge/fuel pressure gauge contraption. Can I use this? Will enough volume pump through despite the tiny line needed to hook up the gauge?
I plan on checking both late this weekend beginning with the vacuum test (because it smells funny when it breaks down). Any numbers or trends to look for would be greatly appreciated. I am dying to drive this thing, but its starting to make me really mad after four weeks and about a thousand bucks into it. Thanks much for any suggestions!