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#3202555 - 03/24/13 03:10 PM mechanic needed
moondog
8 Point


Registered: 08/17/02
Posts: 1408
Loc: benton station tn usa

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I have a 78 bronco ,351m c6 tranny, I have been driving this truck since 1989, the truck will start and idle all day long, not even a hiccup, but when you pull it down into drive it will run until it shifts into second then it starts bogging down, when its starts doing this , if you put the tranny in nuetral it will rev up with not even a miss, put it back in drive and it starts the bogging again,I have rebuilt the carb, replaced the ignition module, dist cap,rotor button, coil,replced the mechanical fuel pump with an electric one, replace the vaccum advance, and the coil pickup in the distibutor, plugs and wires enven the ignition switch, this thing is driveing me up the wal , any suggestions?
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#3202567 - 03/24/13 03:21 PM Re: mechanic needed [Re: moondog]
Camp David
12 Point


Registered: 05/31/03
Posts: 5283
Loc: TN

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Torque converter?
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#3202569 - 03/24/13 03:23 PM Re: mechanic needed [Re: Camp David]
dh1984
10 Point


Registered: 06/14/09
Posts: 3717
Loc: union county tennessee

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 Originally Posted By: Camp David
Torque converter?


Thats what is sounds like.
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#3202575 - 03/24/13 03:34 PM Re: mechanic needed [Re: dh1984]
Good time Charlie
TnDeer Old Timer
12 Point


Registered: 10/08/99
Posts: 6997
Loc: Tazewell

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I would check the Modulator valve first..but like has been said it has to do with your torque converter.
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#3202596 - 03/24/13 03:57 PM Re: mechanic needed [Re: Good time Charlie]
fredfred
8 Point


Registered: 06/24/12
Posts: 1727
Loc: crossville, tn

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What's the timing set at?
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#3202598 - 03/24/13 04:03 PM Re: mechanic needed [Re: fredfred]
moondog
8 Point


Registered: 08/17/02
Posts: 1408
Loc: benton station tn usa

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When it starts this bogging or stuttering it seems more like an electrical problem, the tranny is shifting fine the truck will run but you have to stay abouve 45mph and seems worse when its in a pull such as going up a hill.
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#3202600 - 03/24/13 04:06 PM Re: mechanic needed [Re: moondog]
ImThere
10 Point


Registered: 08/24/06
Posts: 2767
Loc: Lewisburg, Tn

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Fuel pump
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#3202716 - 03/24/13 06:20 PM Re: mechanic needed [Re: ImThere]
SilverFox
10 Point


Registered: 10/16/10
Posts: 4925
Loc: Kodak TN

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Hope you figure it out. My old Ford did the same thing. Chased it for a month or so before it ended up being a cracked spark plug... But if you've replaced yours already I wouldn't think it's your problem.
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