carb trouble

Reply Subscribe

Thread Tools

Search this Thread

Jul 12, 2009 | 03:40 PM

charlie goodman

Thread Starter

New User

Joined: Jul 2009

Posts: 1

Likes: 0

carb trouble

i have a 1983 F-250 that had a 302 with a 3 speed C-6 and i swapped for the 300. The moter was rebuilt just before i bought it. Some how it got 2 bent push rods and valves. i replaced them and did a valve job but i have never had any power out of it. i have 35" tires and stock 356 gears and i get 10 mpg. The big problem is that the truck runs fine for the first 1/4 to 1/2 throttle, execpt no power, but after that it bogs down and has NO POWER, barely runs. I believe it is the carburetor but i have rebuilt it twice with no change. Any suggestions.

Jul 12, 2009 | 06:25 PM

smoke20

Junior User

Joined: Jun 2009

Posts: 87

Likes: 0

From: boones mill,va

sounds kinda like a timing/ignition issue. if you have had the carb rebuilt twice and it still has no power. also check your compression. hope this helps I have a sick one right know myself

Jul 12, 2009 | 06:38 PM

91Bronc300

Elder User

Joined: Oct 2008

Posts: 708

Likes: 1

First thing I would suspect is a very weak spark

Jul 12, 2009 | 06:48 PM

81-F-150-Explorer

Post Fiend

Joined: Jul 2004

Posts: 8,786

Likes: 28

From: Northern California

Could be a Exaust Restriction.

Catalytic converter plugged?

Could also be vacuum or centrifugal advance or both.

Jul 12, 2009 | 06:54 PM

fmc400

MSEE

Joined: Apr 2004

Posts: 10,386

Likes: 35

From: Austin, TX

You need to run a compression check especially since you just did a valve job.

Jul 13, 2009 | 11:31 AM

Harte3

Postmaster

Joined: Dec 2006

Posts: 3,603

Likes: 10

From: Spokane, WA

And a vacuum check.

Jul 15, 2009 | 10:59 AM

AbandonedBronco

Moderator

Joined: Dec 2007

Posts: 7,987

Likes: 104

From: Boise, Idaho

The only thing I can see on the carb is if someone screwed with the jets at one point and they're too small.

Other than that, it definitely sounds like your spark. Maybe the vacuum advance isn't working? Check compression and vacuum, as others have recommended.