Chasing a P0171 with FT data logs

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Jan 13, 2026 | 10:41 AM

CobaltSSlightning05

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Chasing a P0171 with FT data logs

Hey all,

first time here but I’ve wrenched for quite some time. I’m struggling chasing the lean code on a 05 Cobalt SS SC. I have decent trims at idle but I go very rich when applying load or RPM. I’ve changed the MAF, I’ve tested pressure at the rail (58) I’ve smoke tested numerous times and data logged via HP Tuners.

However the longer I watch the data the more confused and over thinking I believe I’m doing…

if I upload the log file would anyone else be willing to take a look and see what they can deduce?

Jan 13, 2026 | 10:59 AM

CobaltSSlightning05

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Log file

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Cobalt SS 1.71326.hpl (351.0 KB, 7 views)

Last edited by CobaltSSlightning05; Jan 13, 2026 at 11:30 AM.

Jan 21, 2026 | 06:40 AM

Jeffsss

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Quote:

Originally Posted by cobaltsslightning05

hey all,

first time here but i’ve wrenched for quite some time. I’m struggling chasing the lean code on a 05 cobalt ss sc. I have decent trims at idle but i go very rich when applying load or rpm. I’ve changed the maf, i’ve tested pressure at the rail (58) i’ve smoke tested numerous times and data logged via hp tuners.

However the longer i watch the data the more confused and over thinking i believe i’m doing…

if i upload the log file would anyone else be willing to take a look and see what they can deduce?

please look up chevrolet service bulletin number 06-06-04-033 i have the same dam problem, and i just read the service bulletin....wow.