IP Timing OBD2

[matuva]

I'm using AE software for that.

ECT at or above 180° F

Most of the time, using Time set and TDCO learn commands, I succeed setting the TDCO at the value desired by the owner (-.05, -1.5 or -1.94)

What confused me, is that I never succeed having low value at desired and actual timing, +3.5 to +8.5

I can get values fluctuating around the +3.5 during time set, that makes very quiet engine, but it goes up as soon as I close time set command.

Most of the time, these values stay around +10 to +11.5

What am I doing wrong ? Would I have to perform a koko routine each adjustment or time set and TDC learn are doing the same ?

 

[NVW]

Would turning the pump slightly to pass side give a lower des. act. value?

 

[ak diesel driver]

I believe TDCO is doing the same things as KOKO with the exception you can control what it is set at.

 

[matuva]

Would turning the pump slightly to pass side give a lower des. act. value?

not really, but that does change TDCOffset value as the pump is retarded.

I believe TDCO is doing the same things as KOKO with the exception you can control what it is set at.

I think so, but may be the koko is more efficient ?

 

[buddy]

The timeset is the ONLY time you will see 3.5°

The PCM controls the desired timing during operation/idle and anytime other than during timeset, moving the IP will not change it at all. Most stock programs are around 8.5°. If when you enter timeset or TDCO it revs to 1000rpm that would explain why it might be at 11° when you see that. Some aftermarket programs or maybe even some factory programs will have it set to 11° at warm idle.

 

[matuva]

OK, thanks for the highlights buddy.
Gonna care about TDCOffset only, one goes with the others anyways, I mean IP position will generate actual timing and TDCO values anyways, so, as long as I get satisfied with TDCOffset value, I should be right ?

 

[ak diesel driver]

That's been my experience

 

[buddy]

As long as the TDCO value is where you want it you cannot affect anything else by moving the pump within valid ranges.