No LT or ST readings....?

[Dave@EFI]

I was scanning the Z06 today and after a couple of spirited runs I noticed a DTC...checked it out and found that I was getting insufficient signal for LT & ST fuel trims. I know they were loggin before the runs....why have they stopped logging?

Any help is appreciated.

Aloha, Dave

BTW, Keith@HP I am still planning to fly you down here. Give me some time to get things arranged following the SEMA show, then I'll check in with you on your schedule.

[Screamn03]

What was the DTC (PXXXX)?

[Missing2]

BTW, Keith@HP I am still planning to fly you down here. Give me some time to get things arranged following the SEMA show, then I'll check in with you on your schedule.

I think you wrote my name wrong.. you ment "Billy" from rockville..

keith is overrated.. :rofl:

j/k If i had the money I would get keith to come my way as well..

[Dirk_Diggler]

is that rockville Mryland

[Dave@EFI]

I retrieved the following codes:

P0134 - HO2S Circuit Insufficient Activity Bank 1 Sensor 1 (SES) (OLD) (History) (Current) (Immature)
P0154 - HO2S Circuit Insufficient Activity Bank 2 Sensor 1 (SES) (OLD) (History) (Current) (Immature)
P0300 - Engine Misfire Detected (Immature)

Can anyone give me some feedback on what the problem is and how I can go about getting it fixed? Any help is appreciated.

Aloha, Dave

[jimmyblue]

The O2s are essential to closed loop operation and if they
fault I believe the PCM quits trying. The likely cause is
aging and cold (relatively speaking) operating conditions.
Is this a car with long tube headers?

[Dave@EFI]

Here's my mod list......

Go: I/C Mag,B&B Bullets,Hurst Shifter,Goodridge S/S Lines,LG Coil-overs,Hotchkis Swaybars,LG LT's w/cats
Show: 18x10 & 19x11 iForged Aero's w/Pirelli PZero Rosso's,Export Lenses,PIAA 1100x,Spectrewerkes C5R Stage II HID's,Raptor Lite,CF Brake Ducts,Cobalt FP & Boost,Wideband Commander,ACI Canards,MCM Mag Hood,EFI FRC's

[Keith@HPTuners]

Dave, it could just be aging O2 sensors.

If you had a fuse blown you would be throwing more codes than that.

Set those 2 dtc's to "No Error Reported", then clear your DTC's.. and your fuel trims should come back online..

However, if your O2's are laggy for whatever reason, tuning via the fuel trims will be more difficult.

How many miles are on these O2's?

[Dave@EFI]

Dave, it could just be aging O2 sensors.

If you had a fuse blown you would be throwing more codes than that.

Set those 2 dtc's to "No Error Reported", then clear your DTC's.. and your fuel trims should come back online..

However, if your O2's are laggy for whatever reason, tuning via the fuel trims will be more difficult.

How many miles are on these O2's?

Thanks Keith. I have 5600mi on the car. I already reset the codes, but if they come back I will do as you instructed.

BTW, when will you be free in the next month to come down to Hawaii?

[SideStep]

ttt
???

[Dave@EFI]

Alright gang, got this one figured out with some expert analysis from Keith@HP. I sent him a log and he sent me back the cure......

Problem: No LT or ST readings

Source: Rear 02's were hooked up and front 02's were not. During my header install we mistakenly hooked up the rear where the fronts should've been hooked up.

Excuse: LOL, had a long night before the install? ;D

Resolve: Hooked up front 02 sensors as they should've been, and deleted the rear 02's with the Tuner Suite.

Huge thanks to Keith. You fixed my problem from several thousand miles away with just a simple analysis of the file I sent. You da man!

Aloha, Dave