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Old 08/12/18, 10:38 PM   #1
BruiserOutdoors
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Carb Issues - Advice Needed -

Bronco has a tough time starting, requires starting fluid on cold starts. Carb stumbles bad on acceleration. Any ideas or tips/tricks? Timing off? Vacuum problems? or ??



Trying to get this fixed in the next few nights so I can make it to the Northwest bronco roundup.


Carb is a Motorcraft D6TE 2 barrel. Just replaced the accelerator pump with no change.
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Old 08/12/18, 10:39 PM   #2
okie4570
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Fuel pump type and age?

1971 U15 302/np435/twin sticks
1966 U14 Born 9/65'
1966 U15 Born 10/65'
1966 U14 Born 9/65'- SOLD
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Old 08/12/18, 10:48 PM   #3
BruiserOutdoors
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Quote:
Originally Posted by okie4570 View Post
Fuel pump type and age?
mechanical and brand new. Could I have installed it incorrectly?
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Old 08/13/18, 06:37 AM   #4
okie4570
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Quote:
Originally Posted by BruiserOutdoors View Post
mechanical and brand new. Could I have installed it incorrectly?
Probably not, but I've heard of new pumps recently that have been bad out of the box. Did you have this issue prior to replacing the pump?

1971 U15 302/np435/twin sticks
1966 U14 Born 9/65'
1966 U15 Born 10/65'
1966 U14 Born 9/65'- SOLD
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Old 08/13/18, 07:08 AM   #5
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Are you getting a good shot of fuel from the accelerator pump, just look down the barrels with the engine off and work the throttle by hand. You should see two streams of fuel as soon as you move the throttle.

77 Bronco, 302, 4bbl, Hei, C4, PS, PB, BCB-A/C, 33" KM2s, D44/Lock-Right - Chromo axles, 9"/Grizzly locker - Yukon axles, Tom Woods driveshafts, 2.5" sl, 1" bl, Bilstein shocks, 1 ton steering, JB-fab twin stick, D20,

2017 F350 CC LB KR FX4
2005 F250 CC FX4
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Old 08/13/18, 10:33 AM   #6
Hozr
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Verify Timing. Vacuum advance or mechanical - verify timing advance. Check floats and make sure the bowls aren't flooding or empty.

1968(67?) Bronco Sport Street Tractor! Intercooled 4BT, ZF S5-42, 4.5" SL, 1.5" BL, 4.10/11 ARB's Front and Rear, 35x12.5 Toyo MT's on Allied 17" Bead locks.
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Old 08/13/18, 01:09 PM   #7
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Are your fuel lines in good shape? I had a kink and a split in the line where it connected at the rear tank, on the tank side of the line. Looked fine from visual inspection, but that part was hidden, until I grabbed the line and felt the split. This caused me to lose prime every night, and would starve on heavy throttle as well. I also had a split line over by the rollover valve on pass frame rail, contributing to my issues. Fuel filter condition and proper orientation are items to check as well.

77, 351 full roller, GT40X heads, headers, NV3550 w/ Twin Sticks, WH 2.5" SL & 1" BL, 33" BFG KM2s, 4.56s, under construction..
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Old 08/20/18, 10:05 AM   #8
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Cold start---follow adjustment procedure for choke.

Stumbles on acceleration...pull a spark plug and post a pic.

Kate - '77 Ranger, AT, PS, PDB, AC
She'll do the ton
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