The LT1 That Could

iTrader: (3)

27 - EGR Electrical Fault (QDM)
26 - EVAP Purge Control Circuit Failure
43 - ESC Module or Sensor Problem
48 - MAF Failure (duh)
77 - Fan 1 Fault

Codes 27 & 48 are fairly self explanatory. Fan 1 Fault is a weird one.

Fans are on ALL the time, and if i use my LO/HI manual fan switch....LO fan squeals, HI fan doesn't.......whats the fix on that??

anyways, need advice on these codes if anyone can help out! thanks!

97badass

iTrader: (8)

did you try shoebox?

The LT1 That Could

iTrader: (3)

not yet...good call!

anybody know if code 26 and 27 are just due to !EGR & !A.I.R., so I can just delete those out???

MEAN LT1

iTrader: (2)

Well if you dont have those items anymore than then yes delete them out.

infinitebird

iTrader: (11)

code 43 = knock sensor circuit fault. that is why your fans run all the time. it also pulls the max timing all the time so your car will feel like it has no power. if you deleted egr that would explain code 27. code 26 is for the evap canister. that's on the side of the intake.

The LT1 That Could

iTrader: (3)

Well, all those codes for nothing more than a basic tune-up. A heater hose had busted and leaked onto the pass. side of the opti, car ran like ****, fouled some plugs, prolly pulled some false knock...i dunno.....she was just sick.

After some new TR6s, new heater hose and some TLC, she is a happy car again!

I forgot that I had screwed up my old tune, and well basically over wrote the tune my buddy put in the car for me to !EGR and A.I.R., which is why I couldn't figure out why they were setting codes....

all is well now in LT1 land!