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Remember: 1 silly mm in either direction = 2.5*, so - if you set it a little bit away from turbo it is advanced - if you set it a little bit toward the turbo it is retarded Leave it run as-is - if it self-corrects later, recheck the timing, go from there KOKO is done with engine off - you...

Check to be sure the crankcase vent is not stopped up - in any case, the surfaces to be RTV'ed must be cleaned with lacquer thinner to remove all oily residue - Autozone engine cleaner and water flush works well, also, on the valve covers but not on the heads with valve covers off - so, it's...

If you installed the IP in the same egg-zact identical position as the original, you can leave things alone, as that position fits those parameters If you installed it in the 90*vertical, you should do KOKO, which will reset the timing to factory spec, then you can readjust the IP to get the...

Over-sensitive, squirrely APP, incorrect timing parameters, fuel distributor position @ stock +3.5*BTDC incorrect for OS 'bumped' position @ +5* over stock

Did not even consider the OS Bump, because I had determined the consequences that would result with a mod that affected operation over the entire rpm range, idle to fwot - as I stated, there are some roads here where even the factory sensitivity is too great

Or algae, or rust or\and other oxidation due to water contamination stirred up by the lift pump and the fuel return line - all input is good, but the point is, don't assume the 9 month old fuel is good, then start looking for other causitive(s) when it's easy to eliminate the fuel as being causitive

May well be, but this is all moot if the fuel is cloudy - cloudy fuel ain't really-good fuel for the Optic Sensor, and won't run like good fuel - pouring fresh fuel in the cannister while the engine is running is a good test, quickly determining further requirement - ATF in the fuel cannot...

The early discrepancies were corrected in the later versions - they're way expensive, which is why TD still uses the parameter-challenged version

Fuel sitting idle from September fall thru winter thru spring into summer has had plenty of time to go stale due to local ambient conditions - if fuel is cloudy, pull the lp fuse, drain the fuel filter cannister, leave the top off, and pour fresh fuel into the cannister as the engine consumes it...

All the pcware scantools will load on a suitable pc without conflict, long as you don't try to open more than one app at a time, which would cause a communication link error amongst the ports, could even get you the blue screen of death GMTDScan is strictly for the GM OBD1 6.5 - AE is...

OK, NVW, just wanted to make sure we're on the same page - do the Bump, or advance the IP with TDCO - not both, they're not compatible because they do the same thing, with TDCO having the edge And low fuelrate is the symptom for too much bump Do the Bump and let it ride - PCM will auto...

Why are we talking bumping and TDCO adjustments in the same paragraph, NVW?

If the ESO is exactly vertical, engine should run, and continue to run thru the 50 starts, when PCM will measure and recalculate timing and TDCO - exactly vertical is factory-spec timing - current conditions sound a little abnormal, but not knowing fuel freshness and such, may be ok - let it run...

Have you done KOKO, or is that the parameters from the original pump, still in memory?

Correct, Louis - I would choose TDCO over Bump, right, for the stock throttle sensitivity, but there are those who like bumping it - but, there are some ruff streets here that require Cruise to prevent jerking the cross'n'bearing joints outta the 'shafts, even with normal APP sensitivity, and a...

It can drop into the 20's here in dead of Winter, mostly above 30's - generally 40's nite, warming up to 80's daytime, sometimes '90's - extremely harsh conditions, eh

As the OBD2 post states, Matt, if the ESO is exactly vertical, do a KOKO to make sure TDCO starts off at -0.5* - move the IP 2mm away from the turbo, lock it down, do KOKO and result will be within spec - just be sure to start off at exactly vertical - any problem, return it to vertical, do...

Read clear thru the OBD2 procedure - several methods are detailed, incl one that doesn't need a scanner http://thetruckstop.us/forum/showpost.php?p=144956&postcount=3

Refer to the DS4 thread up in sticky - the copy-link function is not working, here Post #1 is theory and background, or the long slow pitch - post #2 and #3 is practical implementation, or the fast curve-ball

Top Dead Center Offset, a negative number, seems a strange concept, as why would anyone design a system where advanced IP timing would result in better performance, then arbitrarily let PCM take away, or retard, some of that advance? (+) means advance, (-) means retard in timing numbers It...