Correct me if I'm wrong but if you unplug the O2 sensor (the front one) then the ECU defaults to a constant rich map that does not deviate- Yes?

I took my car to the dealer to see if they could fix my mystery problem, and they said they need to replace the O2 sensor because that is the first step in the troubletree! 400 bucks for a part that will not fix the problem, so I told them to pull it outside and not to touch it....

My symptoms are on startup within the first 100yards it starts studdering and bogging down. If you floor it, things smooth out and its fine. Does it on every single start up, hot or cold and it is a BAD studder like its going to die, then everything is fine.

So if it were the O2 sensor I could unplug it and it would stop yes?

the dealer is full of crap and I am ready to drive this car off a cliff.

 

Yes to first question.

What year/engine Civic?

Is the CEL ON?

How many miles on the engine?

Are you getting poor gas mileage?

What condition are the plugs, wires, cap, and rotor?

 

00 EX D16Y8

The CEL came on for a bit - random misfire

111k

28 - 30 mpg

New:
Cap
Button
Wires
Plugs
TPS
Crank Sensor
O2 sensor
ICM
MAP
(all trying to chase down this problem)

 

and before you ask...

The IACV has been cleaned recently.

....

Oh and I am fairly certain the TPS is not calibrated correctly as I dont have probes that will get into the plug to test the voltage. It would be ALOT easier to check the resistance with the plug off, but I cant find anything that says what the resistance should be or even the current at idle.........

 

You need to calibrate the TPS. You can unplug the TPS connector and rig the ground wire and reference volts wire (5V) to the TPS and then take voltage measurements from the third terminal of the TPS.

Regarding the misfiring, have the coil in the distributor tested and also check the fuel injectors.

 

Oh yeah, ive replaced the coil as well.

If the injectors were bad, wouldnt the problem be consistent?