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04-10-2010, 09:00 PM
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#1 |
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Registered User
Join Date: Jul 2007
Location: Salina, Kansas
Posts: 1,998
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truck cutting out?
its cutting out on highway and i dont know what else to look at.. its got a rebuilt holly carb.. just adjusted the rockers.. did those at 1/4 turn and it seems a whole lot better in town.. like it idles and drives smooths.. sounds good.. but then on highway it wont go past 70... what do i do now?
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1972 C-10...402/400..flowmaster 40 series 1967 Mustang 347 stroker/C-4 1966 Mustang 289/3-speed 2013 Mustang V6/6speed w/300 ponies I may be 23, but i sure do knows 67-72s are sexy! Its not MPG its smiles per gallon! build started 11/25/08 build thread: http://67-72chevytrucks.com/vboard/s....php?p=2993796 |
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04-10-2010, 09:01 PM
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#2 |
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Registered User
Join Date: Jul 2007
Location: Salina, Kansas
Posts: 1,998
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Re: truck cutting out?
its hei to by the way
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1972 C-10...402/400..flowmaster 40 series 1967 Mustang 347 stroker/C-4 1966 Mustang 289/3-speed 2013 Mustang V6/6speed w/300 ponies I may be 23, but i sure do knows 67-72s are sexy! Its not MPG its smiles per gallon! build started 11/25/08 build thread: http://67-72chevytrucks.com/vboard/s....php?p=2993796 |
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04-10-2010, 09:15 PM
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#3 |
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Shake and Bake!
 
Join Date: Feb 2010
Location: Central Coast, CA
Posts: 609
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Re: truck cutting out?
What type of fuel pump are you running, electric or mechanical? Have you tested your fuel PSI?
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"All tyranny needs to gain a foothold is for people of good conscience to remain silent." Thomas Jefferson "You are remembered for the rules you break." General Douglas MacArthur "Support Our Troops And The NRA" |
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04-10-2010, 09:18 PM
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#4 |
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Registered User
Join Date: Jul 2007
Location: Salina, Kansas
Posts: 1,998
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Re: truck cutting out?
mechanical and its not even like 3 months old
__________________
1972 C-10...402/400..flowmaster 40 series 1967 Mustang 347 stroker/C-4 1966 Mustang 289/3-speed 2013 Mustang V6/6speed w/300 ponies I may be 23, but i sure do knows 67-72s are sexy! Its not MPG its smiles per gallon! build started 11/25/08 build thread: http://67-72chevytrucks.com/vboard/s....php?p=2993796 |
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04-10-2010, 09:19 PM
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#5 |
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Registered User
Join Date: Jul 2007
Location: Salina, Kansas
Posts: 1,998
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Re: truck cutting out?
and no i have not whats all the steps involved
__________________
1972 C-10...402/400..flowmaster 40 series 1967 Mustang 347 stroker/C-4 1966 Mustang 289/3-speed 2013 Mustang V6/6speed w/300 ponies I may be 23, but i sure do knows 67-72s are sexy! Its not MPG its smiles per gallon! build started 11/25/08 build thread: http://67-72chevytrucks.com/vboard/s....php?p=2993796 |
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04-10-2010, 09:26 PM
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#6 |
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Registered User
Join Date: Dec 2008
Location: Austin, MN
Posts: 117
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Re: truck cutting out?
If you mean kind of sputtering and not shutting off completely, I had something similar on my old 440 mopar. At about 70-75 mph it would sputter and pop. Lifted the hood and ran the rpms up in the dark and there was quite a light show. The spark was jumping thru the plug wires to the engine. Re-routed the wires and it was ok.
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04-10-2010, 10:44 PM
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#7 |
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Registered User
Join Date: Feb 2010
Location: conway ar
Posts: 122
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Re: truck cutting out?
Yea I would get a fuel pressure gauge and test that first. Could also need different size jets. What is your idle mixture screws set at? I would put new plugs in it, drive it while its cutting out, find a place to shut it off while its running and check the plugs. Check back and tell us what your plugs look like, and that would help alot on whats going on. You cant really test the plugs after its been idling, you need to turn the key off while your driving it. Do you have a timing light, that could also have something to do with it? fuel filter cloged? Sorry so long of a post but theres a few things that could be wrong.
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04-11-2010, 01:47 AM
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#8 |
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Too many toys,not enough money
Join Date: May 2008
Location: Bozeman,MT
Posts: 237
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Re: truck cutting out?
I know you have a few other threads going, I have not read them all. But have you changed the fuel filter with all this going on??
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Looking for all Montana members. PM me or send friend request.http://www.67-72chevytrucks.com/vboa...36#post3813336 |
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04-11-2010, 08:31 AM
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#9 |
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Junior Member
Join Date: Dec 2006
Location: Southeast Missouri
Posts: 2,436
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Re: truck cutting out?
You might also check for colapsing rubber fuel lines. I just found that the one from the tank to the fuel pump on mine is.
I just put a new one on a couple of weeks ago, but the normal rubber hose now days is crap so I am going with the heavier duty type I use on the power steering suction. Danny
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'67 Chevy C-20 short stepper - build complete, 454/SM-465. '75 C-30 Single Cab DRW-350 small block/NP-435. '77 GMC-6500 Dump Truck, 427 Tall Deck. '92 GMC K-3500 Duallie, 454/4L80E. |
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04-11-2010, 10:16 PM
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#10 |
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Registered User
Join Date: Jul 2007
Location: Salina, Kansas
Posts: 1,998
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Re: truck cutting out?
new fuel filter and new rubber lines put on back in july but they might be failing like yall said.. ill check the plugs out this weekend and possibly get new ones.. new plugs went in in july but they couldve gone bad since the carb was all screwed up
__________________
1972 C-10...402/400..flowmaster 40 series 1967 Mustang 347 stroker/C-4 1966 Mustang 289/3-speed 2013 Mustang V6/6speed w/300 ponies I may be 23, but i sure do knows 67-72s are sexy! Its not MPG its smiles per gallon! build started 11/25/08 build thread: http://67-72chevytrucks.com/vboard/s....php?p=2993796 |
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