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Time set 1996 K1500

Works for OBD-IIs only you are in luck 96+ years are OBD-II, in addition to KO/KO & APP to floor, coolant has to be >170F and no stored codes in PCM, or TDCO learn will not activate with KO/KO. I actually prefer to have coolant >175F as I had one give me fits when coolant dropped below 170F at same time I was trying to run through the KO/KO learn.
 
Best way I've found for setting TDCO is to make the avg. in time set be 3.6/3.7 vs. factory recommended 3.5 base timing, when doing the higher setting avg. I'm within the desired -1.1/-1.94 range, so you are only adjusting the IP 1 time.
 
well i think i figured it out heath explained it a little more and i just wasnt looking at the scanner right. but alas now the guy i have to talk to to get the scanner is on vacation so i guess il wait. i could do the koko method but i woulknt know where i was at without looking at a scanner right.
 
After setting the timing on a 96 yesterday I do not envy you. It was a PITA even with the special GM timing wrenches. Could GM have made it any harder for you OBDII guys? Oh yeah, they did, because then they added another thermostat in 1997. On my 94, there is so much room around the t-stat xover and IP I can check it, loosen it, tighten it, and run the TDCO learn, and go back and tighten the lower nuts all in like 10 minutes. More like 2 hours with that reversed T-stat housing and AC lines in the way. I cannot imagine having to tweak and go back several times, I got lucky and hit -1.32 the first adjustment, and off went the happy driver. Quieted down his engine quite a bit, even though he was at -0.35 before. Wierd.

Although some other weirdness, whenever I first checked it, the TDCO had not ever been set, so it was reading -2.46 on Carcode, that must be Carcode's limit. The desired timing was 9 degrees and measured was 9 degrees. As soon as I actually set the timing and the IP was at -0.35 TDCO the desired timing came down to 8 degrees, and measured matched. That perplexed me, because I also did not get a timing code that it was out of tolerance and no SES light. So with the timing not set, it was out of tolerance and advancing more at idle than programmed to. After setting it, the truck actually lost a little pep, because it was only idling at 8 degrees advance. That was strange, and for anyone wondering, I recommend custom programs set to 10 degrees advance at idle.
 
buddy said:
After setting the timing on a 96 yesterday I do not envy you. It was a PITA even with the special GM timing wrenches. Could GM have made it any harder for you OBDII guys? Oh yeah, they did, because then they added another thermostat in 1997. On my 94, there is so much room around the t-stat xover and IP I can check it, loosen it, tighten it, and run the TDCO learn, and go back and tighten the lower nuts all in like 10 minutes. More like 2 hours with that reversed T-stat housing and AC lines in the way. I cannot imagine having to tweak and go back several times, I got lucky and hit -1.32 the first adjustment, and off went the happy driver. Quieted down his engine quite a bit, even though he was at -0.35 before. Wierd.

Although some other weirdness, whenever I first checked it, the TDCO had not ever been set, so it was reading -2.46 on Carcode, that must be Carcode's limit. The desired timing was 9 degrees and measured was 9 degrees. As soon as I actually set the timing and the IP was at -0.35 TDCO the desired timing came down to 8 degrees, and measured matched. That perplexed me, because I also did not get a timing code that it was out of tolerance and no SES light. So with the timing not set, it was out of tolerance and advancing more at idle than programmed to. After setting it, the truck actually lost a little pep, because it was only idling at 8 degrees advance. That was strange, and for anyone wondering, I recommend custom programs set to 10 degrees advance at idle.
Click to expand...
I think I unbolted the a/c line and was able to move it out of the way. That helped alot. Half the PIA was probably carcode. That program IMHO sucks. I have it and don't use it. I'm gonna get AE. I toyed with a Chinese knockoff tech 2 but decided against it.
 
Yea its a pain but i just remove the belt take 4 bolts out of compresser and one 10mm on line hold down and u can move it all over then. I just loosen them all and then put it back together and only play with the top ip bolt. It is a pain but ti doesnt take very long, maybe 15 min. then u get to do it all over again to tighten back up
 
get a 17mm 5 degree flex head wrench:

736167813701xl.jpg


Your life will be sooo much easier.

I built a special wrench for my 98:

ipwrench.jpg


I use either the flex head or my own wrench, both work well, mine maybe a little better because it's shaped for the truck.

then, I built one for "precision" moving of the IP:

ipturner.jpg


I do the same; remove belt, 4 bolts on the ac compressor, loosen the IP nuts except the top, bolts and belt back on, adjust pump, bolts and belts off, tighten all nuts, bolts and belt back on, recheck settings, close up the hood.

Half hour, 45 minutes tops. Longest part is waiting for the truck to get up to temp.

All done with car code, works fine every time. No hassles.

:)
 
I've never taken the belt off and only had to unbolt and slightly tweak the rear ac line on Chances burb. Car Code works fine for me too.
 
Well, HO Ho HO chevy dealer finaly got me in for a timeset. tdco was i fact at +1.8 and after 4 tries ( i was hoping for -1.3 or so) we got a -1.94 so i said enough is enough and left it there.
Now what kind of differces would u expect. its hard to notice much seat of the pants difference, what will it likly do to fuel mileage. and finally am i going to regret the -1.94 other than it rattling when its cold?
 
More torque & HP with advance IIRC on Kennedy's dyno RJ picked up 15 HP & maybe another 30#' of Tq going from stock TDCO to advanced TDCO, if you were actually @ +1.3 TDCO that was WAAY RETARDED timing even less than the factory -.25 to -.75 setting.

Try the -1.94 for now; check again in winter I didn't like the rattle at -1.94 & dropped to -1.5 delta for performance -1.94 to -1.5 not enough to talk about IMO and easier on neighbors on cold mornings.
 
Thanks guys im fixing to pull my camper a lot in the next 2 months so we will see how it works. Thanks again.
 
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