What can be up with my o2 sensor

[cecil bass]

I'm having a problem with my oxygen sensor when I first start the car it runs fine after about 30 seconds to a minute my o2 drops to between 300 and 400 and my car starts to idle all funny. When i turn the car off started again and it'll run fine then after about 30 secs then it goes back to the bad idle......

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[earlbrown]

What's your fuel pressure at the rail when it's acting up?

 

[cecil bass]

Like 37 or 38 w/ line on

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[cecil bass]

And it is the single wire type

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[earlbrown]

are your cross counts updating when it's acting up?

 

[cecil bass]

What field is it in the pro logger im new to the pro logger and i dont have my scanmaster hooked up right now

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[cecil bass]

Ill see if i can just send file so you can see it

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[Chuck Leeper]

This from a cold start??

 

[cecil bass]

This from a cold start??

it doesn't matter....

 

[cecil bass]

it doesn't matter....

this is the idle ........

 

[cecil bass]

the same just a few rev's ..........

 

[cecil bass]

Any thoughts? ............ this didnt happen til i messed with the iac and tps........


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[earlbrown]

That's odd. One part of your log file shows the 02s tank yet the injector pulsewidth stays pretty much the same. I did notice your MAF was kinda high at idle reading 9 and nowhere on either file were you in closed loop. Do you have a chip that idles in open loop?

I'd swap out the 02 with a Denso unit and see what that does. It seems like the 02 started talking again when you blipped the throttle. Might just be a old age + heat thing. You wouldn't happen to have a Bosch 02 in there now would you?

 

[cecil bass]

I have a TT chipp 5.7 not sure if it idles in open or closed loop. I do have a heated o2 sensor w/ harness i put it in does the same thing. Not sure what kind the heated one is but i did get it from kirbans. The one wire sensor is a bosch unit ..... i have no clue whats going on. Any suggestions?

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[cecil bass]

By the way both units are brand new....

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[turbo nasty]

Try a new o2

 

[cecil bass]

Try a new o2

They both are new!!

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[earlbrown]

Try a new Denso 1 wire. And when you're under the hood, give all the 02 wiring a good tug and look for weak spots, corrosion, etc..

Just to eliminate a variable, I'd probable ground the 02 wire under the hood then probe the 02 wire on the ECM plug to see how close to 0ohms it is.

 

[cecil bass]

How would I wire the o2 wire under the hood? If the signal coming out of the ECM matches the signal that the prologger is showing whats the next step? Has anyone seen this before?

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[earlbrown]

The powerlogger reports what the ECM tells it to display. If the 02 input is compromised the powerlogger can't show the compromise.