Compression Ignition Addict
Join Date: Dec 2008
Location: port arthur texas
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Tunes and their effect on diagnostics
Once you throw a tune into the mix you are no longer STOCK.
All diagnostic procedures and self tests are based on OEM stock parematers.
With a tune in place and you run a scan you never know what values may be off and by how much mainly because tuners don't make public what they change or what they change it to.
This is their bread and butter after all and understandable why they don't share.
When I know their is a tune and I have to run diagnostics I ask that the tune and tuner be removed I have a better chance getting to the bottom of things.
Lord I shall lead them to the water but I will not try to make them drink