Very odd problem

[Jon91TSi]

Hey all..

My car has been acting up a bit lately, and I thought this was all due to an oxygen sensor but I guess not.. Anyway, when the car sits and idles, it has a slight miss and nothing shows up on my a/f gauge, when we hooked the datalogger up it showed .02 volts from the o2 at idle.. I replaced the o2 and im still having the same problem.. nothing at idle.. and while driving down the highway the af gauge flops around like normal untill you let off the gas, then it pegs rich for a second or 2 and then goes off the chart into lean and wont light back up untill you hit the gas.. I replaced my o2 with a DENSO sensor, best one u can get and im stumped.. my mechanic said he thinks my capacitors on my ecu may be bad? please help me, this is driving me nuts!


Jon91TSi

 

[TalonTSi-AWD91]

Could be right, it would be a good idea to check the caps anyways to make sure they're good. Only takes a few minutes to do.

 

[Jon91TSi]

Can anyone else help me out? I bought the capacitors today and will have them put in this week, but i was wondering if anyone else had anything to add?

 

[boost_dependent]

one of my friends put in a denso sensor and it wouldn't read right...... so he went to the dealer and bout the OEM(the best way to go) O2 sensor and it works fine now! so maybe goto satan and get the OEM sensor they are like 75 bucks though.

 

[Jon91TSi]

Hey,

I had it in with the stock o2 sensor before the denso one and it did the same thing.. It cant be the o2 sensor, it has to be something else interfering with the readings, but what???