Hptuner Help
08-01-2007, 02:15 PM
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Hptuner Help Hi! Sorry this is my first post if I do something wrong.
Im tuning a 04 turbo chevy truck w/ a 6.0. When I come to a stop for a few sec. the truck goes from a smooth idle at around 12% tps to 18%tps and Im having to stay on the brake hard to keep it from moving. I can move it to park and its fine then move it bake to drive and it fine, but if I move the truck 8feet and stop it starts agin.
Thanks for any help.
Im tuning a 04 turbo chevy truck w/ a 6.0. When I come to a stop for a few sec. the truck goes from a smooth idle at around 12% tps to 18%tps and Im having to stay on the brake hard to keep it from moving. I can move it to park and its fine then move it bake to drive and it fine, but if I move the truck 8feet and stop it starts agin.
Thanks for any help.
08-01-2007, 08:40 PM
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I would look to O2 sensors and some degree of mis-trimming,
it sounds like it's needing more and more air to hold idle and
that would be a consequence of the (real) mixture drifting.
Watch the STFTs as you enter stopped idle, do they slide and
does it seem like this is in sync with the go-to-**** behavior?
Do you seen the O2s' switching waveform frequency get slow
and "lumpy" as it sits?
it sounds like it's needing more and more air to hold idle and
that would be a consequence of the (real) mixture drifting.
Watch the STFTs as you enter stopped idle, do they slide and
does it seem like this is in sync with the go-to-**** behavior?
Do you seen the O2s' switching waveform frequency get slow
and "lumpy" as it sits?