What to look for in a scan?

[Timonator]

I'm a total noob to tuning.I have 99 TA that have installed headers,cam,heads,pulley,ls6 intake on.I've recorded a couple of scans and wanted to know what trouble areas to look for so I don't hurt my engine.The tune in it now is tolerable.But I know it isn't correct.

[EC_Tune]

Well, it's significantly lean virtually everywhere 13-16% in Scan 2 but in the March 30-07 it looks (STFT wise) Rich.

[Timonator]

Well, it's significantly lean virtually everywhere 13-16% in Scan 2 but in the March 30-07 it looks (STFT wise) Rich.

Scan 2 was a longer drive.the march 30-07 scan was just a trip around the block.How can you tell when it's lean?

[Timonator]

You mean the LTFTs are rich,right?

[EC_Tune]

LTFT's that are + are lean, - LTFT's mean it's richer.

[Timonator]

I got it.How hard is it to richen it up?

[Bill@HPTuners]

I got it.How hard is it to richen it up?

usually a simple copy & paste will work as long as you've filtered out bad info or cells.

[Timonator]

This is my most recent scan.From what i can tell I think it's telling me that I need injectors.What do you think?

[EC_Tune]

MUCH better near idle but everywhere around it is still lean.

[Timonator]

How do I richen it up?Or do I have to buy injectors?

[EC_Tune]

You are at that decision point. However without a wideband you have no idea how rich/lean things are at WOT. It may be rich for all we know. If it's rich, then you have enough injector (for now ).

[Timonator]

I'm guessing it's lean at high rpm because according to the scan It goes lean and the injector duty cycle is maxed at high rpm.Can I richen up the fuel trim cells?Will that help?If Iever get a wide band do I need 2,1 for each side?What would you do?

[EC_Tune]

I wouldn't assume it's rich or lean. Stock narrowband sensors are highly *un-reliable*.
I have seen 11.5 with the wideband and NB's were 820mv
I have also seen 13.5 with the wideband and NB's were 960mv

Now which are you going to believe?

[Timonator]

I guess I'm going to wait till I can get a wideband.Will it work with just 1 or do I need 2?

[Timonator]

would this one work?
http://cgi.ebay.com/ebaymotors/INNOV...QQcmdZViewItem

[EC_Tune]

No reason to have two and yes the innovate will work.

[Timonator]

Thanks for the help.I'll be back after I get the wideband.

[Timonator]

Oh yea,I was also wondering why the KR kicks in every so often.Is that normal?

[Supraman]

This is just the sensor can you get by with wiring the sensor direct to HPT or do you need to get the display unit also?

[Bill@HPTuners]

you need the sensor and controller...some of the lower priced units have just these two things without the display. But work very well with hpt.