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Message: [QUOTE="golfer, post: 964801, member: 266"] A cylinder contribution test code is not an 'injector' code. 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... [/QUOTE]

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