Yes, unfortunately there are (too) many LB7 owners here that have had multiple sets of injectors replaced, all within the 200K/7yr period.
GM has been tightening up their 'goodwill' extensions on injector warranty. You need to push to get this done - sooner than later - siting
Sure sounds like you have a couple sprays hanging up. Sorry to hear that, but its not that uncommon with the LB7s. The smoke and fuel dilution are classic signs. I would ignore the compression variances, unless you are experiencing low power, rough idle, or unacceptable oil consumption.
- the unacceptably short lifespan of the first replacement set;
- ...the $1100 already spent on your dealer throwing parts at the problem, to no avail;
Don't take no for an answer! Ask that your request be elevated to GM's Customer Service. Get your timeline and your receipts in order, and documented thoroughly.
Remember: Even paying half of the next 8, would be better than receiving nothing. Right now, GM is not contractually obligated to replace them, since your warranty term has clearly expired.
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