96 f-250 xl
any help will be appreciated. old problem that never was solved. been running this truck like this for sometime cause i don't use it much. so this is the problem and what i have done to troubleshoot. problem is a nasty knock at one injector and rough idle.began with knock at #8 injector. moved that injector to #2 hole, knock followed. replaced with a rebuilt injector, no change. replaced with a new injector, no change. checked UVC for ohm value. all within spec and all the same value within less than 1 ohm. checked this from the IDM harness out to each injector and back. had all injectors flow tested, showed good. replaced IDM with known good one, no change.compression test on left bank shows 395-400 #s. truck seems to run fine on hiway, gets decent mileage. at idle sounds like it falling apart. any ideas as to whats going on? why would the knock move from one hole to another but not be an injector problem? fuel psi 55-60 #.
Last edited by danz; 01-16-2013 at 12:39 PM.