cold blooded, but beautiful when warm
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Senior User
Joined: Feb 2004
Posts: 159
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cold blooded, but beautiful when warm
I recently aquired a 1981 f250 4X4 with the 351m motor. It has a new edelbrock carb and intake manifold that was installed before I purchased it.
So my problem is that when cold, on light acceleration, the vehicle will either just completely cut out and die, or there will be a small backfire, and then it will keep running (but very rough). If the vehicle does the backfiring thing, it takes just a second, and then the engine will start running smoothly again. It is literally impossible for a smooth slow acceleration from a stop when the motor is cold. If I kind-of double pump the accelerator, then I can keep it running, but its one heck of a take off...
Once the truck warms up (10 minutes of driving) it doesn't miss a beat. Carb has been adjusted, and the truck idles fine. Just curious if this is a common enough of an occurance to get some info on where to start.
Thanks in advance...
So my problem is that when cold, on light acceleration, the vehicle will either just completely cut out and die, or there will be a small backfire, and then it will keep running (but very rough). If the vehicle does the backfiring thing, it takes just a second, and then the engine will start running smoothly again. It is literally impossible for a smooth slow acceleration from a stop when the motor is cold. If I kind-of double pump the accelerator, then I can keep it running, but its one heck of a take off...
Once the truck warms up (10 minutes of driving) it doesn't miss a beat. Carb has been adjusted, and the truck idles fine. Just curious if this is a common enough of an occurance to get some info on where to start.
Thanks in advance...
Post Fiend
Joined: Jun 2003
Posts: 5,643
Likes: 8
From: NE Texas
Adjust the choke linkage (if manual) or check to see it is hooked up properly if auto. The backfire is normal when the choke is open on a cold engine. The backfire sometimes can jog the choke, causing it to work - in that case it may be hanging.
check the choke
check the choke
