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Tech / General Engine Is your car making a strange sound or won't start? Thinking of adding power with a new combination? Need other technical information or engine specific advice? Don't see another board for your problem? Post it here!

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Old 04-10-2006, 11:35 AM   #1
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Join Date: Apr 2006
Location: Missouri
Posts: 5
Car: 1991 RS
Engine: 350 TBI
Transmission: 700r4

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Computer Problem
I have a 1991 RS originally had a 305 TBI in it. I dropped a 350 TBI in it and having some problems that I cant figure out how to fix( Fan won't kick on w/o AC being on, Won't start when up to operating temp, slow throttle response) could any of that be due to the 305 computer in it. I went to the local automotive store and was told that the computer in my car is made only for a 305 and the 350 computer is different. Will that help with any of my problems?
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Old 04-14-2006, 01:09 AM   #2
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Join Date: Jun 2005
Location: dallas texas
Posts: 31
Car: 89 camaro
Engine: 305 tbi
Transmission: 700 r-4

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Did you change injectors and the knock sensor? Slow throttle might be caused by insufficient fuel. I am just thinking though. If you did do everything else then it is the computer. Just get a chip or prom made for you engine and it will run much better.
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Old 04-14-2006, 02:19 AM   #3
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Join Date: Aug 2005
Location: Yellowknife, NWT, Canada
Posts: 3,003
Car: 84 Z28
Engine: 357
Transmission: TH-350C
Axle/Gears: 3.43

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Well if the computer still thinks its a 305 its trying to run thats definately a problem...


Either get a PROM for a 350 or better/easier just go to the JY and get the whole ECM.
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Old 04-14-2006, 02:19 AM
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