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FlCracker82 · January 3, 2012

Hello fellow Chevy fanatics! I am new to this site and I just recently bought a 1989 chevy 1500 cheyenne with a 4.3l and a 5-speed manual. I was wondering if anybody had any tips on cleaning throttle body injectors. I am not getting the mpg I want and its running rich. Also I was wondering if I cut off the catalytic converter and ran a straight pipe into my muffler if I would gain anything besides a more aggresive sounding exhaust. Thanks for your time.

99silveradoz71 · January 3, 2012

Welcome

8.1HD/ALLISON · January 3, 2012

Welcome! Try running a fuel system cleaner like gumout or STP. Cutting the cat off won't help any unless its clogged up. Might check out the o2 sensor if its running rich.

pwall · January 3, 2012

Welcome!

FlCracker82 · January 3, 2012

Thanks everybody for the welcoming to the site. I recently replaced the o2 sensor,so its not that. I found out that the previous owner switched out the stock throttle body with one from a 5.7l. I think the injectors are dumping too much gas into my 4.3l. Does that sound like the problem or are some of the parts from the 2 different engines really interchangeable?