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worst injector problem ever,HELP!!!!
I replaced injectors in my dad's 2000 7.3l, originally pulled all 8 to have them cleaned,just had a rough cold start,but ran find after warm. We have a reputable injector repair service here in St.Louis that we use. Took them in to have cleaned and said 4 were bad and 4 on the way. Replaced all 8 with remans. On initial start had rough idle and knocking,put around 50 miles on it and knocking got louder,still rough idle. Did contribution test and said #3 fault,removed injector took it back and they gave us a new one(not reman)better idle(still rough),passed cont. test and buzz test,but still loud knocking. Narrowed knocking down to cyl. #4 or 6,pulled those 2 returned them and was givin 2 new ones(not reman) put back together and had rough idlestill noisy knock,cyl. #2 and 3 contribution fault,and now 1293&1294 fault. Replaced injector harnesses today and now it still idles rough,still knocks and on a buzz test cyl. #1,5,7,8 high low fault,1293 and 1294 codes. Still cyl. #3 fault on the contribution test.
So as of now, I replaced all 8 injectors/glow plugs and both injector harnesses,checked all wiring for chafing on drivers valve cover,all wiring crossing lifter valley.
Injectors are as follows:
All 3 new injectors have factory yellow solenoids
All 5 reman have black Delphi replacement solenoids(if any of that matters)
Seems like an electrical issue,but don't understand the knocking injector noise
Keep in mind,before all of thismthe truck ran excellent when warm,just had a rough idle and lack of power when cold.