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04-11-2013, 05:38 PM
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#1 |
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Registered User
Join Date: Dec 2011
Location: bryants store ky
Posts: 33
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350 engine problems
ok i have a 54 chevy on a s10 frame with s10 wiring harnes for a 4.3 i put a 89 350 with tpi fuel injection changed the computer i have it running but it surges up and down an then it quits will strat back but it still surges anybody have this problem how did you solve the problem
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04-11-2013, 08:02 PM
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#2 |
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Registered User
Join Date: Sep 2012
Location: Oregon
Posts: 3,303
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Re: 350 engine problems
So you have wiring for a 4.3 and an ecu for a 350...what other electronics are 4.3? is the tbi 4.3 or maf/map/temp etc?
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04-11-2013, 09:59 PM
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#3 |
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Registered User
Join Date: Dec 2011
Location: bryants store ky
Posts: 33
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Re: 350 engine problems
i have changed the tps,map,egr sensor ,computer , throttlebody temp sensor the only thing that i havent changed is the distributer and wiring harness
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04-11-2013, 10:19 PM
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#4 |
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Senior Member
 
Join Date: Jun 2011
Location: North Beaver TWP PA
Posts: 833
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Re: 350 engine problems
You might want to spend some time here reading the info. http://www.lt1swap.com/
I believe you may need to swap a couple wire pins around at the computer plug depending on what computer you are using. Not sure if that is your issue but there is a wealth of knowledge on that site. You could email Brendan (its his site) and he will help you. He sent me wiring schematics to help me convert from a vortec 350 to vortec 454 using a newer style computer.
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___________________________ 1959 Apache Short Fleetside, 1959 Apache NAPCO Long Stepside, 1957 3100 with 59 fleetside bed 1957 5700 LCF Crew Cab "Big Bertha",1959 GMC F370 1958 GMC 600, 1946 Chevy, 1959 Viking 60 LCF 1974 Elcamino SS, 1979 6500 GMC Tilt Bed Wrecker Big Bertha Build |
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04-12-2013, 12:08 AM
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#5 |
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Registered User
Join Date: Jul 2007
Location: Toppenish, WA
Posts: 15,713
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Re: 350 engine problems
Are all of the sensors hooked up as they should be/ My little drive to work box with wheels is doing pretty much the same thing and I found that a wire to one of the temp sensors got broken during a trans swap when I was moving things around. All the wires and hoses are in the same spot just over the bellhousing part of the trans on that particular car. A sensor that isn't hooked up or working correctly may be the issue.
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Founding member of the too many projects, too little time and money club. My ongoing truck projects: 48 Chev 3100 that will run a 292 Six. 71 GMC 2500 that is getting a Cad 500 transplant. 77 C 30 dualie, 454, 4 speed with a 10 foot flatbed and hoist. It does the heavy work and hauls the projects around. |
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04-12-2013, 02:03 PM
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#6 |
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Registered User
Join Date: Feb 2012
Location: Camano Island, WA
Posts: 166
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Re: 350 engine problems
Did you repin the wiring harness to match the TPI ECM? Going from a TBI wiring harness to TPI isn't a simple process.
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