So my buddy Jeremy @ Disturbed Diesel Performance built me some injectors this past weekend. Bosch bodies with some 5x.012 SAC nozzles. We're thinking that I may have a bad injector or two, which is contributing to my 9-11mpg issues...

Wonder if its breaking up ...... did you bump up the timing ?

didnt touch the timing at this time, as we're trying to determine what the issue is. so leaving it stock timing keeps us at a baseline.

Well 13.5 degrees is your baseline ... no ?

Just thinking the extra timing may help with your mpg ... can always set it back

True, but he felt that with the timing being at stock, that is not the issue with the extremely poor fuel economy.  We'll up the timing later, but want to explore other areas to see if there's a culprit elsewhere.

just for giggles, measure your backlash in your timing! Verify also everything in the timing case is lined up. U sure engine is tdc (balancer hasn't slipped) during timing test?

I had a 354 perkins that didn't idle worth a dang, turned out it had a hammered out keyway on the

crank. The bottom of the keyway was wallowed, plus the moon key also way undercut. When the key

was sitting in the 'way, it looked perfect! But I could rotate the gear almost a full tooth by hand.

Those symtoms weren't loping though, it was more like an occasional chirp or bark in the exhaust, from random cylinders.

Edited February 26, 201411 yr by rancherman