nidfd112 Posted May 9, 2019 Share Posted May 9, 2019 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. Quote Link to comment https://www.bigmacktrucks.com/topic/57114-mp-8-with-a-knock/ Share on other sites More sharing options...
fjh Posted May 9, 2019 Share Posted May 9, 2019 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! Quote Link to comment https://www.bigmacktrucks.com/topic/57114-mp-8-with-a-knock/#findComment-422276 Share on other sites More sharing options...
terry Posted May 9, 2019 Share Posted May 9, 2019 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 Quote Link to comment https://www.bigmacktrucks.com/topic/57114-mp-8-with-a-knock/#findComment-422287 Share on other sites More sharing options...
DJ Truck Repair Posted May 11 Share Posted May 11 Did you ever find out what the issue was??? I have the same problem and it’s driving me nuts!!! Quote Link to comment https://www.bigmacktrucks.com/topic/57114-mp-8-with-a-knock/#findComment-551526 Share on other sites More sharing options...
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