98 talon awd failed emissions

[CiscoBite1Time]

i've searched and most people have mods on their cars. my car is stock with the exception of a magnaflow muffler. my car idles fine (~ 800 rpm), no idle surge, etc. my CEL was on right after i bought the car. I've swapped the current MAS w/ a spare i had, and bought new O rings, sheets, etc for my injectors. This past sunday I took off my o2 sensor hoping to replace it with another one i had laying around but the thread on the spare was messed up. I ended up putting my old one back on.

After putting my old one back on my CEL stopped showing for a good 1 1/2 days. i just got back from the local emissions station with a big FAIL. This is where my problem is:

HC: (Idle) reads: 264.2 should be: 220.0
CO: (Idle) reads: 2.37 should be: 1.20

all other equipment passed i.e. cat, PCV, oxygen sensor, etc. i really thought my o2 sensor was the reason but not too sure anymore. any ideas on this stock car?

 

[Slow 95 TSI]

i've searched and most people have mods on their cars. my car is stock with the exception of a magnaflow muffler. my car idles fine (~ 800 rpm), no idle surge, etc. my CEL was on right after i bought the car. I've swapped the current MAS w/ a spare i had, and bought new O rings, sheets, etc for my injectors. This past sunday I took off my o2 sensor hoping to replace it with another one i had laying around but the thread on the spare was messed up. I ended up putting my old one back on.

After putting my old one back on my CEL stopped showing for a good 1 1/2 days. i just got back from the local emissions station with a big FAIL. This is where my problem is:

HC: (Idle) reads: 264.2 should be: 220.0
CO: (Idle) reads: 2.37 should be: 1.20

all other equipment passed i.e. cat, PCV, oxygen sensor, etc. i really thought my o2 sensor was the reason but not too sure anymore. any ideas on this stock car?

98 Talons are junk, I think you should just part it out and be done with it. I'll buy the front bumper cover

Seriously tho what codes did it have when the light was on? That o2 sensor could cause a bad rich condition with that car. But if you post your code/codes I'm sure someone can help you on here.

So...... You ready to part it out yet?

 

[CiscoBite1Time]

oops sorry bout not putting the code. the code was P170 (or Po170) fuel trim malfunction.

 

[schoffs4]

ck for boost vacuum leaks that will mess the fuel trims ecu only can adjust so much before the light comes on

 

[CiscoBite1Time]

thanks for the help. just wanted to add that my CEL comes and goes as it wants.

 

[Slow 95 TSI]

ck for boost vacuum leaks that will mess the fuel trims ecu only can adjust so much before the light comes on

This is a good point. If you gas the car hard will it stumble and puff black smoke?

Fuel trim trouble can be caused by boost or vacuum leaks maybe even a bad FPR.

 

[Defiant]

Holy crap, put in a NEW O2 sensor. CELs don't come on and stay on, they store the error and wait for the next one.

 

[Artago]

For new sensors go to www.sparkplugs.com. Tom.