There has been much discussion on here about the failure of an injector on a DI or a Etec motor being the reason for an overall engine failure and requirement to rebuild or supply a new powerhead.

My question revolves around how the injector fails. I realize there is no way to predict or in some cases know why. But when a injector fails does it just quit putting fuel into the cylinder ??? If so, then there would be no damage to the cylinder as it would still be getting oil, just no fuel, basicly a dead cylinder. Am I wrong ??

It seems that what must be happening is that as part of the result of the failure, the cylinder goes lean either from an internal failure or possibly from being clogged or gunked up. We all know what that lean condition will do !!!

Seems like to me if the injector worked or did not work 100% in either case, repairs would not have to be so extensive. If an injector just went dead with no lean condition, Then only the injector would have to be replaced.

If my theory is correct, do you repair guys ever see a failure where just the injector needs replacing ?? If my theory is off, am sure the experts here will correct me.

Just Wondering