Hesitation with cold engine
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Junior User
Joined: Oct 2003
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Hesitation with cold engine
Hi everyone, I'm back working on my trucks after a 4-5 month hiatus (job change etc).
I just put in a newly rebuilt carb on my '86 F350 with the 460 engine.
I also added in a 1 inch phenolic spacer under the carb.
Everything runs. However, when truck is cold and when I stomp on the gas, the engine will hesitate and sometimes die.
Has anyone else encountered a similar problem?
I am wondering if it is due to:
a. The phenolic spacer (condensed fuel)
b. Carb not properly adjusted (I had adjusted idle, fast idle and slightly enriched idle mixture : 1 turn or so of the screw).
The truck also has a fuel return line. Does anyone know if there's a fuel filter in the fuel return T-joint/junction?
Thanks.
Ben
I just put in a newly rebuilt carb on my '86 F350 with the 460 engine.
I also added in a 1 inch phenolic spacer under the carb.
Everything runs. However, when truck is cold and when I stomp on the gas, the engine will hesitate and sometimes die.
Has anyone else encountered a similar problem?
I am wondering if it is due to:
a. The phenolic spacer (condensed fuel)
b. Carb not properly adjusted (I had adjusted idle, fast idle and slightly enriched idle mixture : 1 turn or so of the screw).
The truck also has a fuel return line. Does anyone know if there's a fuel filter in the fuel return T-joint/junction?
Thanks.
Ben
Senior User
Joined: Jan 2005
Posts: 216
Likes: 2
Or the vacuum line going to the distributor is disconnected. Also could be the adjustment of the acellerator pump.
The tee fitting is part of the "hot fuel system". All that is in there is a .090" hole that allows for the fuel to circulate. Could be clogged I guess, but unlikely. You can remove it a blow backwards through it to clean out a screen that is on the inlet. I put an inline clear filter prior to tthat tee to avoid that problem.
The tee fitting is part of the "hot fuel system". All that is in there is a .090" hole that allows for the fuel to circulate. Could be clogged I guess, but unlikely. You can remove it a blow backwards through it to clean out a screen that is on the inlet. I put an inline clear filter prior to tthat tee to avoid that problem.
Thread Starter
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Junior User
Joined: Oct 2003
Posts: 83
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Thanks for the responses.
I'll check the timing and the T-fitting this weekend.
I am also wondering if there is a problem with the vacuum switch on the thermostat housing. The vacuum line to the distributor connects to that.
Ben
I'll check the timing and the T-fitting this weekend.
I am also wondering if there is a problem with the vacuum switch on the thermostat housing. The vacuum line to the distributor connects to that.
Ben
