I just installed MAC headers.

The driver side has a O2 sensor in it. Its not even plugged in though (its a universal).

The passenger side has the correct O2 sensor in and its plugged in to the factory harness.

The 2 rear O2's are not even there, The plugs just hang.

My SERVICE ENGINE SOON light is on.

But am i damaging the car at all. Besides gas mileage.

And how much power do you think I am losing because of it?????

 

lots of power loss, probably flooding the engine some

 

Loseing gas milage = running rich = bad.
Loss of power to im sure.

 

Its not necessarily running rich or lean because the one pre-cat sensor is disconnected. The PCM can't go into closed loop without the O2 sensor being connected and working. Since it can't go into closed loop, it has no way to know it that bank is running rich or lean, and no way to correct for a faulty A/F ratio. If in fact is was running severley rich, you could be washing the lubrication off the cylinder walls, and diluting the oil. If its running lean, you could be running into detonation problems. Both of those conditions may damage the engine.

Why would you even attempt to run the engine that way?

 

yea my cars doin the same thing, i have to get these o2 sims or convert to obd1..in the meantime im trying not to drive it

 

After-cat O2 sensors are not a problem... they only check to see that the cats are there and working. Its running without a pre-cat sensor that might do damage.

 

I know its bad. UGH Injuneer, why cant you be like "yea man go ahead ull be ok" lol

no im jk i wouldnt want you to say that.

Im buying parts heres and there. I want to get the heads milled and cleaned up and also throw a cam in and port out the heads. But it taking me longer than usual to save money. Economy sucks