Originally Posted by 79chevy39.5's
so what kind of testing did they do? return rate? does the truck have any smoke, or a miss when it drops rail pressure? could indicate a sticking injector
ive never seen this on a duramax however I have had similar things happen on 5.2 Isuzu's
I didn't ask what they did. I assume they opened up the filter head, saw that the check ball and spring were missing, put them back, test drove it and observed no problem, then said it's done.
No smoke, no miss.