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If you think the dealer is screwing you ask for a printout of the results. In order for your truck to qualify it must fail the return rate test, balance rates mean nothing. Your injectors are covered for 7 years or 200,000 miles from the delivery date. Its not a warrenty therefore it does not follow typical warrenty procedures. The injector service policy is just that, and injector service policy. If it is on a modded truck (big turbo ETC) it could be and unseated injector cup, bent rod or cracked piston. Take it to the dealer and have a return rate test performed. On a stock truck its usually injectors or possibly an unseated injector cup. If you have a balance rate out of spec, it means either a compression loss or bad injectors. And when you hit the throttle they will all go to 0 this is normal. If it is +/- 6 then you have something going on. You can also do this in drive with the park brake on. To perform the test get it up to operating temperature then when at idle in park if any of the balance rates are +/- 4 then you have something going on in that cylinder. EFI live will also perform this test as will other scan tools and of course a Tech II. Canned tuners are tunes that are not custom so anything besides EFI Live or HP tuners. There are a couple of aftermarket canned tuners that do this. If you suspect that your injectors are bad first perform a balance rate test. If you are experiencing any of these symptoms on your LB7 yes your injectors could be bad. Here is a thread with all of the juicy details. It can be fairly audible and on a fairly stock truck it will be normal, on a modded truck you will know that it sounds different and we can help you from there. Programmers exhausts intakes, trannys and other little things are still part of what I consider a stock truck.ĭoes your duramax tick or knock? It is normal to some extent. Thanks and enjoy.įirst off when I and others say stock truck we mean stock engine stock turbo stock injectors, stock that. Not that I don’t like you or don’t like helping you but with hundreds of repeat threads on here, it burys the new questions. And if you have a question, read this again.