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Message: [QUOTE="PSDEng, post: 431360, member: 1228"] This is directly from Swamp's website: CCT test: this test compares the RELATIVE BALANCE between the output of (not just the injs!) but everything that contributes to the power output of that cylinder...which includes quite a lot.. from that cylinders compression (piston ring sealing), the intake & exhaust valve sealing, valve lift, injector output, etc..we've even seen bad torque converters and flywheels cause enough engine vibration to cause various cylinder balance faults..so, while a scan tool can aid in the detection/direction of a problem... experience can & will outweigh a scan tool 9 out of 10 times..."no codes" doesn't mean everything is "OK"...and conversely...just because you HAVE a code...doesn't mean that there is a problem...or it has anything at all to do with a specific problem or issue. so...a truck could have 8 weak injectors...that show up FINE on these tests...or 8 GOOD injectors that could fail CCT in a worn out engine...balance is balance...so even if you DID have something show up on a CCTest...it doesn't mean it's BAD...hell we've seen guys replace the same inj, multiple times...leaving the other 7 w/ 200k+ miles...and call back saying that they still have the same code(s)...in these types of cases...a STRONG injector will show out of balance against the 7 old/weak injs... More rare issues, such as aerated engine oil...or aerated fuel can also cause goofy/poor/inconsistent running issues..that new injectors can't fix...or may only fix for a short time... the last thing we like to do is have someone purchase injs for a truck/engine that needed injectors...but later finds out that the injectors weren't the only problem. Compression is king...meaning....that if the compression is good...then the engine can be fixed, and is worth investing time/money in getting it to run properly...but if compression is poor or mediocre...no amount of injectors, sensors, fuel system/HPOil system improvements are going to make it 100% right...it may only make the situation/engine run "better"... What I'm getting at is....this might be completely unrelated to injectors and could be "something else" that contributes to the balance of the motor. [/QUOTE]