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2002 international 4300 throws code 521 according to servicemaxx, injector harness is new, suspecting ecm, but not sure if this could be a possible solution. all new clean power connections, swapped ecm relay, i get the 521 code even with injector harness disconnected during an injector test...

Hello all. I have a 2002 international 4300 DT466. Just purchased a few weeks ago, when purchased I suspected a few bad injectors, had 357,XXX on dash, had a miss, hard start w/knock when cold... Had injectors tested 5 out of six where bad.. So i replaced injectors with rebuilt/reman ones...

So I recently purchased a tow truck for a new business venture. It's a 2002 international 4300. When I purchased it I knew it would need a little work, it sat for a year, steel tank had rust, so the tank was replaced with a aluminum one. the truck ran, but was slugish on hills and had a...