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I own a 65 mustang and it has a 289 with a 4 barrel holly carb. Every time I let it idle for a bit or drive and pop it into neutral( it's a four speed) it just dies. I'm thinking it's the carb. What are other opinions?
1965 Mustang dies
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SO many places to start here!!!
the typical reasons are tune up related/ignition/carb.
make sure your point and spark plugs are in good shape and adjusted properly. As well, make sure your timing is set right too. Set base at 10-15 degrees, and total at 32-36 degrees (if you have a timing gun)
however, it's most likely a carb issue as you mentioned. The very first suspect is a vacuum leak. Vacuum leaks are sometime easily detected by a hissing sound under the hood. You want to look at all the ports off the intake and carb, follow the lines, make sure they're all terminated and none of them are disconnected. You can get a vacuum guage from autozone if you're unsure for about $20....that guage simply plugs into a vacuum source at your intake. 17-20 pounds and you're good. Any less and you have a leak.
If you have no leak, your idle speed could be too low. There is an idle speed adjustment on the dr side middle of the carb. it's a screw that you turn. you want the rpms to be about 700 give or take.
the typical reasons are tune up related/ignition/carb.
make sure your point and spark plugs are in good shape and adjusted properly. As well, make sure your timing is set right too. Set base at 10-15 degrees, and total at 32-36 degrees (if you have a timing gun)
however, it's most likely a carb issue as you mentioned. The very first suspect is a vacuum leak. Vacuum leaks are sometime easily detected by a hissing sound under the hood. You want to look at all the ports off the intake and carb, follow the lines, make sure they're all terminated and none of them are disconnected. You can get a vacuum guage from autozone if you're unsure for about $20....that guage simply plugs into a vacuum source at your intake. 17-20 pounds and you're good. Any less and you have a leak.
If you have no leak, your idle speed could be too low. There is an idle speed adjustment on the dr side middle of the carb. it's a screw that you turn. you want the rpms to be about 700 give or take.
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Hello AirmanFesler,
You have been given some GREAT advice already but I would like to add
a couple of things.
1. - If it is an older (year) Holley - -you should have site bowl screws on the bowls.
There are the brass screws on the pass side of the front and back portion of the bowl.
The bowls are the outside parts of the front and back of the carb.
Anyway - -start the car and let it run a moment.
Shut off the motor.
Unscrew the brass slotted screw (caution there is a washer behind the screw)
The level of the fuel in the bowl should be just touching the bottom of the hole
where the screw was removed.
If the bowl level is not correct, it is a simple adjustment. The 5/8 nut with a slotted screw on the top of the bowl is your adjustment. I will not bore you with adjustment
procedure unless you need it.
It is very likely a vacuum leak or perhaps the carb needs to be fine tuned.
In my opinion - Holleys are pretty simple to adjust and fine tune.
Check out all the advice and let us know
Print Dad
You have been given some GREAT advice already but I would like to add
a couple of things.
1. - If it is an older (year) Holley - -you should have site bowl screws on the bowls.
There are the brass screws on the pass side of the front and back portion of the bowl.
The bowls are the outside parts of the front and back of the carb.
Anyway - -start the car and let it run a moment.
Shut off the motor.
Unscrew the brass slotted screw (caution there is a washer behind the screw)
The level of the fuel in the bowl should be just touching the bottom of the hole
where the screw was removed.
If the bowl level is not correct, it is a simple adjustment. The 5/8 nut with a slotted screw on the top of the bowl is your adjustment. I will not bore you with adjustment
procedure unless you need it.
It is very likely a vacuum leak or perhaps the carb needs to be fine tuned.
In my opinion - Holleys are pretty simple to adjust and fine tune.
Check out all the advice and let us know
Print Dad
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