If you live in California, the answer is yes due to the additives in the gas. GM has issued a TSB on 5.7L SPFI engines for California and extended the warranty on these injectors to 10 years / 200,000 miles. The TSB tells the service dealers to flush the injectors -- you can do the same thing by adding the cleaner to the gas tank.
It's not absolutely necessary in most cases but, it doesn't hurt. I use one in my vehicles about every 25,000 miles and everything woks great. If you want a cleaner that works well though, buy either Techron or Seafoam; they're the best of the additives that I've found. For a great spray carb cleaner, I use Berkebile 2+2 Instant Gum Cutter or you can get the NAPA brand (Mike's Carb Cleaner, I think) spray which is the same thing (both of them smell like mothballs and work like magic). I've tried dozens of other brands of carb/injector cleaners/sprays and these are the only ones that I've found to work as advertised. Rich B
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% There are two classes of pedestrians in these days of reckless motor traffic - the quick and the dead. ~ Lord Dewar 1933 ~
Climbing into a hot car is like buckling on a pistol. It is the great equalizer. ~ Henry G. Felsen 1964 ~
I'll put in my two cents here since I just within the last month researched and had my injectors cleaned using a "motorvac" which is the same as described using a fuel/cleaner mix that is run through the engine.
I had rough idle and miss on a '95 2.3L. It just wouldn't go away. I'd use Seafoam and that tank it would run great, then it was back to normal. I finally decided to have them cleaned using that method.
It worked wonderfully, and was fairly inexpensive, though not at all when compared to buying a can or bottle of cleaner.
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