Hey all, found a ZR2 Jimmy with 160,000km on it, convinced the seller to give me a steal of deal thanks to my new scanner lol! I have little experience with these scanners, but I have some info I can share and hope to make sense of.

No engine light on, but shows 3 stores and 1 pending code.
p0101 mass or volume air flow A circuit range/performance
p0171 system too lean bank 1
p0174 system too lean bank 2

pending
p0101 mass or volume air flow a circuit range performance.

will be posting more about it, noticed weak acceleration in first gear, and a lot of slop in the steering wheel, as well as steering wheel shaking when driving.
pushed on the tires trying to test ball joints and they seem ok. theyve been replaced.

anyway, the thing runs pretty good, idles good, shifts good, has some side damage (tent trailer spun into it) so ill be posting a lot trying to fix that. anyway.

thanks. ill upload pics when i pick it up/

 

Standard thing - post LT/ST fuel trims for bots bank for idle rpm and 2-3k rpm.

 

During this test, I had no issue with starting idle (used to sound like its about to die for the first minute or two), and scanner showed 0 codes of any sort.
IDLE
SHRTFT1 (%): -4.7 (Also, scrolling past the last value i added, it shows SHRTFT1%: -2.3% and lists long1, shrt2, long 2 at the same values)
LONGFT1%: 6.3
SHRTFT2%: -3.9
LONGFT2%: 5.5
SHRTFT11%: -3.1
SHRTFT12%: 99.2
SHRTFT21%: -3.9
RPM/min: 603

SHRTFT1 (%): 43.8
LONGFT1%: 0.0
SHRTFT2%: 43.8
LONGFT2%: 0
SHRTFT11%: 46.1
SHRTFT12%: 99.2
SHRTFT21%: 45.3
RPM/min: 2600

 

 

It looks to me, that Your system detects lean condition on 2600RPM and tries to compensate with a higher injection timing. I would start testing the fuel pump pressure.

 

 

It's in a sticky thread:
https://blazerforum.com/forum/2nd-ge...eakdown-88305/

 

 

Thank you guys, appreciate the sticky and input

 

Sold my red blazer, been driving this thing for the past 2 weeks.
Replaced fuel filter with a wix model

Hard start when cold - sounds like its about to stall out (leaking gas in the plenum?) for the first minute. After that it idles nice
Fuel trims are all over the place when I’m driving,
nowhere close to 0. 15+ On all readouts
MAF code (cleaned MAF - no help)
Throttle response can be nowhere to be found when I need it. Lot of lag sometimes, but when it works it works.
Decent mpg.

I’m going to start looking for either a vacuum leak or try and diagnose the fuel pressure regulator. Anyone have anything different to suggest? Its a 2005 w 160,000km