And the GMTDScanner Says

[ak diesel driver]

Program won't allow tdco set until engine reaches 180 degrees in temperature.

 

[NVW]

No, the temp has to be 180.
Try moving it a RCH back to the pass side. Time set should only have to be done once after each IP move. Then do a learn, learn can be done several times if you don't get a result you like. Revving the engine can also give different results. If you see what you want stop the learn.

 

[Big T]

No, the temp has to be 180.
Try moving it a RCH back to the pass side. Time set should only have to be done once after each IP move. Then do a learn, learn can be done several times if you don't get a result you like. Revving the engine can also give different results. If you see what you want stop the learn.

OK in the GMTDScan program under Top Dead Center in the Tools it has Timing Set on the left and TDC Learn on the right. Both have buttons that say "ON". If I click on the button, then a button appears that says "Off". So I have a real basic question: when is it on? Is it on when the "On" button appears? Or is it on when the "Off" button appears?

If it's on when the "On" button appears, then does it only do the the Learn when the temp reaches 180? If that's the case, then I haven't brought it up to that temp. I believe it got just below that.

I really need to get that long wrench bent as it's a real PITA with it straight.

Moving it a RCH to the passenger side? I'm afraid to ask, but what's a RCH?

 

[Mudbath]

OK in the GMTDScan program under Top Dead Center in the Tools it has Timing Set on the left and TDC Learn on the right. Both have buttons that say "ON". If I click on the button, then a button appears that says "Off". So I have a real basic question: when is it on? Is it on when the "On" button appears? Or is it on when the "Off" button appears?

If it's on when the "On" button appears, then does it only do the the Learn when the temp reaches 180? If that's the case, then I haven't brought it up to that temp. I believe it got just below that.

I really need to get that long wrench bent as it's a real PITA with it straight.

Moving it a RCH to the passenger side? I'm afraid to ask, but what's a RCH?

I think it is twice the thickness of a BCH

 

[NVW]

When activated and it highlights off, then it's on and vice versa.
RCH- the first letter is "Red" I'll leave the rest to you

 

[NVW]

I think it is twice the thickness of a BCH

You don't know nothin, it's 1/2:smile5:

 

[Mudbath]

You don't know nothin, it's 1/2:smile5:

Red is twice the thickness of true blonde.):h

 

[NVW]

You've obviously never had a true red head

 

[Big T]

When activated and it highlights off, then it's on and vice versa.
RCH- the first letter is "Red" I'll leave the rest to you

And now you know why I was afraid to ask.):h

I had corrective lenses surgically implanted (vision was beyond safe correction with Lasik) and then had my vision touched up with Lasik. When guys ask how good my vision is, I tell them I can see a wild hair on the beach at 100 yards.

That IP is so hard to move that a RCH is about all I can get out of it.

Well it sounds like I'm getting closer. All I want is my truck back. I start a new job next week and will be on the road quite a bit, so little time for jacking around on this truck. I'll be shutting down and selling failed banks. Kind of the flavor of the moment in this economy.

 

[Big T]

When activated and it highlights off, then it's on and vice versa.
RCH- the first letter is "Red" I'll leave the rest to you

And now you know why I was afraid to ask.):h

I had corrective lenses surgically implanted (vision was beyond safe correction with Lasik) and then had my vision touched up with Lasik. When guys ask how good my vision is, I tell them I can see a wild hair on the beach at 100 yards.

That IP is so hard to move that a RCH is about all I can get out of it.:yumyum::001_07::34: Ain't nothing like going down on the fire.):h

Well it sounds like I'm getting closer. All I want is my truck back. I start a new job next week and will be on the road quite a bit, so little time for jacking around on this truck. I'll be shutting down and selling failed banks. Kind of the flavor of the moment in this economy.

 

[Mudbath]

O crap Big T now I am seeing double.

 

[Mudbath]

You've obviously never had a true red head

To be honest... no

 

[buddy]

When setting TDCO, you have to be warmed up, 170F is fine, I do it all the time, because mine wont get over 180 at idle. I'm not even sure GMTDScanTech has this requirement, but you should let it warm up so there is no cold advance applied and youre seeing the true timing.

Also, you have to clear the DTC88 prior to performing the learn function. So clear the DTCs, then Learn TDCO.

dont worry about the desired and actual values at idle. That is PCM controlled. For timing it, only look at that in the timing window when you hit Time Set On. That will show you the base cam timing and should be about 3.8 degrees average, and youll be set for about -1.75 TDCO, and if closer to 3.5 degrees average about -0.5 TDCO.

With the IP nuts loose you need a tool to turn the pump still. I took a bar and threaded two holes and put two 3/8 bolts through to make my own IP timing tool. Before that I used an oil filter pliers .

 

[Big T]

O crap Big T now I am seeing double.

The fire has a way of doing that.):h

 

[Big T]

When setting TDCO, you have to be warmed up, 170F is fine, I do it all the time, because mine wont get over 180 at idle. I'm not even sure GMTDScanTech has this requirement, but you should let it warm up so there is no cold advance applied and youre seeing the true timing.

Also, you have to clear the DTC88 prior to performing the learn function. So clear the DTCs, then Learn TDCO.

dont worry about the desired and actual values at idle. That is PCM controlled. For timing it, only look at that in the timing window when you hit Time Set On. That will show you the base cam timing and should be about 3.8 degrees average, and youll be set for about -1.75 TDCO, and if closer to 3.5 degrees average about -0.5 TDCO.

With the IP nuts loose you need a tool to turn the pump still. I took a bar and threaded two holes and put two 3/8 bolts through to make my own IP timing tool. Before that I used an oil filter pliers .

Thanks Buddy, particularly for the comments not to worry about desired and actual at idle. Those were bugging me and you were the first to answer my questions. I realize that for some this stuff is just understood and they gloss past it, but then there are others, like myself, who are on the steep part of the learning curve who need the clarification.

I will make the adjusting tool today and get than long wrench bent. Thanks on the suggestion.

Question: I clear the codes then go to Learn TDCO and it shows ON. How long does it take to learn? When do I know that it's done?

 

[buddy]

After you move the IP, make sure to perform the time set also. So you'll clear DTCs, perform the time set, then perform TDCO learn.

Both the Time Set and TDCO learn will end themselves after about 20 seconds. Or you can hit the OFF button yourself to stop them. time set needs to be done after you move the IP. You can stop Time Set after about 5 seconds, just so you can get a good idea of the average value. TDCO you can stop it too, whenever you see the value you desire. Heads up though, TDCO doesnt always stick when you hit OFF, and you might just have to try again (just hit TDCO Learn again).

For me if there is a TDCO value higher than I want, like if its right around -1.94, but goes to -2.02 (which will cause DTC88) I can rev up the engine a little and TDCO will come down a little and I hit OFF when I see the value I want. That is backwards for OBD2 trucks, maybe because they increase idle RPM when going into TDCO, but mine goes into TDCO at whatever idle is, like 600RPM. So the real point might be that revving might not help you increase TDCO like it does some others.

 

[Big T]

After you move the IP, make sure to perform the time set also. So you'll clear DTCs, perform the time set, then perform TDCO learn.

Both the Time Set and TDCO learn will end themselves after about 20 seconds. Or you can hit the OFF button yourself to stop them. time set needs to be done after you move the IP. You can stop Time Set after about 5 seconds, just so you can get a good idea of the average value. TDCO you can stop it too, whenever you see the value you desire. Heads up though, TDCO doesnt always stick when you hit OFF, and you might just have to try again (just hit TDCO Learn again).

For me if there is a TDCO value higher than I want, like if its right around -1.94, but goes to -2.02 (which will cause DTC88) I can rev up the engine a little and TDCO will come down a little and I hit OFF when I see the value I want. That is backwards for OBD2 trucks, maybe because they increase idle RPM when going into TDCO, but mine goes into TDCO at whatever idle is, like 600RPM. So the real point might be that revving might not help you increase TDCO like it does some others.

Thanks Buddy, now that is clear and simple to understand.

Question: Is there a targeted Time Set I need to hit before moving onto the TDCO?

 

[Big T]

Not Working At All

I'm giving up for now. Need to move on and focus on something positive.

I broke the male side of the plug off from the coolant sender that screws into passenger side of the crossover. There's still two exposed prongs to slide down on, but the connection is crap. If it's not connected, idle shoots up to 900. Connected it drops to below 600. With some jiggling and twisting I can get it to say for a constant temp reading on the GMTDScan.

Prior to that, I was doing the GMTDScan, clearing codes and doing Timing Set then TDCO Learn. Nothing happens. Timing set never shuts off. I shut it off manually and go to TDCO Learn and nothing happens. No matter where I move the IP, the TDCO always shows -2.02. All the way to the drivers side is -2.02. A wad of hairs past my scribe mark to the passenger side and it's still -2.02. Still generating codes 88 and 34.

So, like I said I'm giving up. Putting the tools away and parking the truck in the backyard. I'll need to buy a new coolant sensor. I'll regroup when that part arrives, but it looks it will be down for awhile with the pending work schedule and Holiday related activities. Hard to imagine I'm at this position for only changing a timing chain and a water pump. Should have left well enough alone. I guess no good deed goes unpunished.

 

[NVW]

Your stepper motor on the IP may not be moving

 

[Big T]

Your stepper motor on the IP may not be moving

What is a stepper motor? Why is it not moving?