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MP-8 with a knock


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Had a truck come in with one of number one cylinder exhaust valves was burnt on it. Customer wanted to replace cylinder head and we did. Finished the installation and when we started truck up it runs for 15-20 seconds fine and after turbo spools up it develops a knock in the engine. If we cut number one injector out with computer knocks seems to dissappear.  We have removed pan and inspected cylinder wall, piston and bearings and also have changed out #1 injector. Does anyone have any ideas on what to check out next.

 

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I'm just going to throw this out there did you keep the injectors in the same holes when reassembly  took place ! Each injector has a trim code! if you didn't you might try gathering all the trim codes up and reinputing them in the the software in the right order including the new one see if it changes the situation! The ecu may be tring to compensate for a miss match! or cylinder imbalance! 

just soming to think on!

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1 hour ago, fjh said:

I'm just going to throw this out there did you keep the injectors in the same holes when reassembly  took place ! Each injector has a trim code! if you didn't you might try gathering all the trim codes up and reinputing them in the the software in the right order including the new one see if it changes the situation! The ecu may be tring to compensate for a miss match! or cylinder imbalance! 

just soming to think on!

Just love all those electronics!    terry:MackLogo:

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