00JDAws6

iTrader: (1)

My dad has a 98 trans am and was putting headers on and crossed the o2 wires and now hptuners is reading no volts with brand new sensors any ideas? Could it possibly fry the pcm?

crainholio

iTrader: (2)

Which wires did he cross?

Just putting an Ohm-meter across the older 1-wire O2 sensors was usually enough to fry the sensor, for example.

00JDAws6

iTrader: (1)

He crossed the 02 sensor wires on the factory ones where you have to slpice it for the headers to extend it i think he switched the brown ones.

crainholio

iTrader: (2)

I'd try replacing the O2 sensor at this point. If that fails, and he's absolutely sure he's got the wiring right now, it's time for a replacement PCM.

00JDAws6

iTrader: (1)

Yea we bought new ones that dont need to extend them and still no volts on hp tuners. So new pcm ? no fuses or relays that could have went?

crainholio

iTrader: (2)

If he's absolutely, positively certain that he got the wires connected correctly it's PCM time.

The only powered circuit on the O2 sensor is the heater. And even without it, you'd still see sensor voltage albeit lazily until the sensor gets up to temp.

00JDAws6

iTrader: (1)

damn that sucks. yea were absoltutely sure there connected right. how much does a 98 pcm go for?

crainholio

iTrader: (2)

No clue, and you may need to have it tweaked to talk to your BCM so VATS will let it start.

Bet he's glad he tried to save $$ by splicing his O2 harness. Expensive lesson to come.

Shallow Bay

iTrader: (3)

Before you go and replace the PCM, make sure the ENG SEN fuse is not blown. It's located in the second fuse and relay center which is in the engine compartment.

ShevrolayZ28

iTrader: (4)

There's a good idea. I bet that's all that happened. Been there, done that.

00JDAws6

iTrader: (1)

Yea we did check that fuse its ok.

RedWS6 00

Depending on emisions rules in your area, you could run open loop all the time. That way you dont need the O2's. You would need to change some tables, could be a way forward.....

pphilli1

iTrader: (1)

Id recheck the 02 wiring & make sure its correct.I had that problem
& it set only misfire codes,no 02 faults.Worth a try before getting to deep.

Sharpe

iTrader: (7)

Do you have a friend w/ an PCM you could swap to test? Sucks man.

98Camarod

iTrader: (43)

Is the car running?

00JDAws6

iTrader: (1)

Yea the cars running but like ****. It falls on its face. The wiring is correct we bought bosch 13111 you dont have to splice them they are already exteneded and you plug them into the harness.

I have another question though I was looking at a new pcm and they said it needs flashed (reprogrammed) can Hp tuners do this?