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79 International truck no power
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valleybusman
User
Jan 25, 2011, 10:20 PM
Post #1 of 2
(1984 views)
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79 International truck no power
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I have a 79 International 2ton truck with a 345 gas engine and a llison transmission with about 200000 miles on her . Well To start off with it started losing power I could hold it to the floor and it would go over 45 and took forever to get there . I found a clogged fuel filter and changed the pump not sure how it was . Then It started backfiring and bucking after that . So I replaced the plug wires and plugs and installed a new cap and rotor . This has the prestolite distributer . Things seem to be better so but no power . I rebuilt the carb and didn't find much crap in it . I timed this at 5 degrees BTC . Took it out and it takes off fast but still slow to build up speed and once it hits 40 if I put my foot into it nothing but if I back off and slow it back down it might take off . What could I be missing ? Control module ? Bad carb ? It has fresh gas and has been run everyday for months .Just started the last couple weeks .
I also checked the cylinders for compression and evry cylinder was 115 to 125 except one and it has 90 .
(This post was edited by 6.2man on Jan 25, 2011, 10:21 PM)
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Loren Champlain Sr
Veteran
/ Moderator
Jan 26, 2011, 5:41 PM
Post #2 of 2
(1966 views)
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Re: 79 International truck no power
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Just a wild guess, here....Check for exhaust backpressure. Check centrifugal advance, vacuum advance, total advance. Let us know the results. Doubt if the problem, but a fuel pressure test might be handy? I would think 5-7 psi should be okay?
Also, give us a vacuum reading at idle and at 2500 rpm.
Loren
SW Washington
(This post was edited by Loren Champlain Sr on Jan 26, 2011, 5:42 PM)
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