98 379 pete

Hi everyone i have a problem my brother's pete has a 475 cat, it's not running strong and we're lost on trying to solve it! We tested the cac it was good we checked the timing it was right we checked the injectors and found a couple that was weak so we changed them it improved alittle but still not where is supposed to be. Cat checked it and could'nt find anything wrong. We talked to the previous ower about anything he replaced or had repaired he said he had a new cam and timing gears installed after it broke down on him, we are stumped we had two different mechanics check the timing and it was spot on please help also we three different computers thanks.

 

Thanks for the replies but we have checked fuel pressure and the lines also.

 

it boosts about 25 to 28psi and the filters are good donaldson is the brand we even ran them without the filters no luck i think the timing is retarded a tooth maybe what would happen if i advanced the timing 1 tooth

 

Thanks for the help guys we are still have power problems im trying to convince the owner my brother to get the ecm flashed by Mr Gainey we also think that the turbo is the problem to, monday im going to change the ecm and turbo wish us good luck.