Nice forum! I have a problem that I'm hoping to get some advice on. I have a 2003 250 HPDI. The engine missed bad on #2 and #3 cylinders, ran lean on both of these cylinders and melted the pistons. I replaced with a rebuilt powerhead. After installation of the new powerhead, I still have a misfire on both of these cylinders. When I first turn the key on to start the engine, both cylinders fire according to my scan tool (Sierra STATS). Within 2 seconds, both cylinders show misfires again. I have replaced the trigger coil, no change. I suspect the injector control modules. The only other problem I've noticed is that when I first turn the key on, the fuel pump does not engage. As I understand, I should get a 2-4 second prime. Any suggestions? Thanks all!
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2003 HPDI Missfire on #2 and #3
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