LT1_E85_Corvette

Alright guys, I am having some weird behavior from the beast the past couple of days.

Behavior:
-Idles like it's Misfiring
-While driving it stumbles, and sounds horrible
-Coolant Temp is not going over 165 degrees

Codes:
P0030 - Heated Oxygen Sensor (H02S) Heater Control Circuit Bank 1 sensor 1
P0053 - Heater Resistance Bank 1 Sensor 1 (PCM)
P0132- Heated Oxygen Sensor (H02S) Circuit High Voltage Bank 1 sensor 1
P0135 - Heated Oxygen Sensor (H02S) Heater Performance Bank 1 Sensor 1
P0137 - Heated Oxygen Sensor (H02S) Circuit Low Voltage
P0172 - Fuel Trim System Rich Bank 1
P0300 - Engine Misfire Detected


After I put about 5 miles on the car it acts PERFECT, and the coolant temp goes right back to 185 degrees as it should...... What is the deal?

Mods: Headers (installed for about 10 months now), 165 degree thermostat

THANKS SO MUCH FOR YOUR HELP!

DSteck

Replace your driver's side O2 sensor.

LT1_E85_Corvette

Would this cause the miss fires and fuel being rich? I was thinking it might be a bad injector however, I'm not 100% sure

JUIC3D

I don't think Dave would have posted if he wasn't fairly confident.

I'd try the 02.

JUIC3D

Not to mention 4 of your 7 codes have the 02 sensor in them..

If it walks, talks, acts like a duck...

LT1_E85_Corvette

awesome - Thanks for the advice guys! I will order the O2 that is pre cat, and get it installed.

Any reason why it would just clear up after driving it for a bit, and does the fuel trim depend on this O2 for fuel measurements?

Thanks!

JUIC3D

02 sensors are heated and rely on heat to function correctly. I don't know a great deal about them but maybe the heater inside is broken? After the motor warms up and enough hot exhaust gases flow over the sensor, it starts to work normally?

Just a shot in the dark.

And yes--your fuel trims are almost exclusively controlled by your front 02 sensors. The computer constantly adds/removes fuel based on the reading received from the 02 sensors.

LT1_E85_Corvette

You are a gentleman and a scholar. I will get this dialed in as soon as I can get the part in. I might have to uninstall the driver side header to get it installed. Tried to take it out last night however, my O2 sensor socket doesn't give me the correct angle to get it out...

Does anyone have any suggestions on what is the best O2 sensor to pick up?

JUIC3D

Get an OEM one. I don't think there is another viable option.

LT1_E85_Corvette

Done and done - Thanks again... i have to drive it home which is about 8 miles. It's parked until it's fixed.

JUIC3D

Good deal. Keep us posted.

DSteck

What I assume is happening:

Heater circuit is dead, so it trips heater code. Since it can't heat up, it's just showing high voltage, hence that code. High voltage tells the PCM to pull fuel. It keeps pulling fuel to the point that the trims max on that bank at -25%, so it throws Bank Rich. It is running that bank extremely lean, which is likely causing the misfires.

It clears up after a little while because natural exhaust heat warms the sensor enough to sort of operate. If a new sensor doesn't fix it, you've got a wiring issue.

JUIC3D

^ What I said, only more elegant

LT1_E85_Corvette

Another highly detailed post! thanks guys. My local GM dealer ordered a new O2 sensor. It should be in mid next week (sooner the better), and I will update you guys on the results.

Is it comment to burn out O2 sensors with our cars?

LT1_E85_Corvette

OK - I was able to get my hands on a o2 sensor, and... wait for it... wait for it.....

FIXED THE ISSUE!

Something so simple made my car run like it was on 4 cylinders! Thanks everyone for your help, time, and consideration!

JUIC3D

And people wonder why their cars run like crap when they get doo doo 02 extensions for header installs. OEM connectors or nothing in my opinion.

Anyway, glad to hear that solved the problem.