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I recently bought a 1990 GMC c1500 with the 4.3L V6. I’m going to be doing a lot of driving and moving with this truck throughout the next few months. I even thought of using it to begin helping people move. Besides the basics… (air/fuel filters, tires, regular tune ups, etc.) what are some things I can do to make this thing get even better mileage??
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Might want to see if your truck has the updated injectors, I might be wrong but that motor uses a spider style Injector. The old style only had a central style injector and the updated version has injectors at each cylinder. To check which version have youll need to look at the injector system , the old style only had hoses the new syle has a wire that runs to each cylinder. I swapped mine for an ac Delco unit when I had an s-10 because, the OE developed leaks and the new unit improved mpgs. Stay away from any type of after market air filers or exhaust they are only for noise these trucks move a ton of air an the 4.3 uses the same intake and exhaust size as the 5.7 so it’s oversized for the 4.3 to begin with. New diff fluid will go a long way also.
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Thank you. I was kind of thinking about changing the oil in the diff and tranny along with filter. I thought it may give me better mpg but thank you for confirming it! As for the injectors. I was also thinking about replacing the injector filters but…How large of a difference would the newer ones make? And what type of wiring hassle would I face if I didn’t have the newer setup??
see if this helps.
http://www.ericthecarguy.com/faq/finding-and-fixing-the-causes-of-poor-mpg
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