Why would I have gotten a code 42 after a fuel adjustment?

["Turbo-T"]

I've adjusted my turbo tweak chip many a times. Just a few days ago I reset it on the #1 parameter (fuel at WOT) from 132 back to 128. Once done I shut off the ignition and then back on again/started the engine. This was the only setting I messed with.

Immediately I noticed the engine idle rpms were not as high as usual and the check engine light on. The scanmaster revealed a code 42. I shut the engine off, waited a few seconds and restarted. This time it started normally.

Not sure if this was related to changing the chip settings for fuel...but a code 42 i believe has to do with the EST circuit?

 

[RegalT-type85]

Try setting it back, clear the ECM, see if it pops up again on the SM.

 

[we4Mateo]

Old thread but my car acts the same. I've gotten a code 42 four times now but ONLY after changing a setting in my TT chip...

 

[RIFF RAFF]

Try this

Double post opps ..

 

[RIFF RAFF]

Try this

Malfunction Codes Reference. MITE HELP BAD LINK FIRST TIME .

 

[we4Mateo]

My car runs great. I don't need the reference. I know what the code is but my car runs awesome and only sets the code after adjusting my chip. It never comes back if I don't adjust the chip, so I just reset the ecu and it's fine for as long as I leave the chip alone.

 

[we4Mateo]

I put in my chip settings again right after resetting the ecu and it's fine.

 

[Ghettopoptart]

Anyone have an update on this? I'm having exact same problems..Can't figure out what it is.