Has anyone come across a relatively permanent fix for the constantly malfunctioning central port injection system used on the 5.7L light truck engines?
I've had my 1999 GMC Yukon into the service dealer a dozen times in the last
4+ years because the fuel injector keeps sticking. The dealer simply flushes it with a detergent cleaner, but that doesn't last very long (between 1K and 3K miles).
I've tried different types & grades of fuel with no luck. I've also tried many over the counter fuel injector cleaners, but they don't seem to work either.
Two dealers have told me the same thing -- this is a known problem with this particular injection system and the only fix is to have it cleaned by the dealer every few thousand miles. Fortunately, GM recognized this problem and is offering the service as warranty even though the warranty period (3 years) has expired. It's quite a pain, however, to keep taking the vehicle to the service shop.
Appreciate any pointers on after-market fixes.
Thanks in advance for any advise.