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Classic Mustangs Tech Forum

Technical discussions specific to 1964-1967, 1968-1970, and 1971-1973 Classic Mustang. Discuss all tech related to in-line six cylinder and V8 powered Vintage Mustangs here.

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Unread 04-04-2011   #1 (permalink)
65fastbackinsac is offline Made Member

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Default 65 mustang running rough

My 65 289 v8 with carter afb 4 barrel has been acting up lately. When I go to start it up in the morning when cold & sittin g a couple days I think it is popping back firing a bit through the carb until I get it up & running. It does not have a choke hooked up. lately though since it has been getting warmer, once it is warmed up, it will act like it is loading up & bogging down when taking off from a stop. It is a stick shift & usually you could push in the clutch & rev it up & clear it up. Now lately it has gotten much worse & I have been having a hard time keeping it running. I cant seem to rev it up & clear it out & so now it just dies. It will usually start right back up though but still loads up & dies. I pulled only one plug tonight & it looked good, mostly light brown on the electrode tip.

Anyone have any ideas where I should begin ? Start trying to adjust the carb, which I already did a bit by adjusting the two idle screws but was not help. Haven't check points yet & actually I am not even sure yet if it still has points or pertronics.
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Unread 04-05-2011   #2 (permalink)
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Default

It takes about 5 seconds to pull the cap and see if you have points or the pertronics module. Here's a link that should help you identify it...

If I were you I would make sure my choke is set up and installed correctly. Then double check my timing and check for a possible vacuum leak and go from there. It sound like you just need to get it good and tuned up...

Jason at NorCalMotorSports.com can set you up if you need a professional...
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Unread 04-05-2011   #3 (permalink)
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Check your fuel filter, are you adjusting the carb with a tach or vac. gauge? How much vac are you getting? How long since the carb has been rebuilt?
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Unread 04-05-2011   #4 (permalink)
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Default 65 mustang running rough

Hello 65fastbackinsac,

Sounds like very likely a cab issue.

The POPS when cold are most likely from a lean mixture.
This would happen if the choke is wide open when cold.

It is getting close to warm weather so you may be OK
pretty soon - -But something to consider is hooking up the choke.

I ran Hollies for years with NO choke and ran all winter.


Now for the bogging - -could be a number of issues.

Before I explain or list them, I would try SIMPLE first.

1. - Change the fuel filter and air cleaner
2. - Add some "Sea-Foam to the gas tank and let it run in.
3. - A little spreay on the carb would help as well for that you
need a carb and choke cleaner.

Once you do the simple things - - then check

1. - Points or ignition. How is the parts in the distributor cap?
2. - When weas the last tune-up. Perhpas old wires or sprak plugs.

if after that - -you are still having issues - - you may want to
rebuild the carb. That would be one of te last things I do however.

Do a good tune-up - -check timing and dwell (if points)

Let us know

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Unread 04-05-2011   #5 (permalink)
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Thanks guys for the feedback. I will look a bit closer at the fuel filter however I put an inline filter in I think last fall when I ditched the rubber fuel line frokm pump to carb & put a steel line in. I actually did not use a vacuum guage when adjusting the idle circuits. I (hate to say it but) just listened by ear. Not sure how long the carb has been rebuilt, it was on it when i bought the car about a year ago.
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