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  #25  
Old 10-17-2013, 09:49 AM
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Re: O2 sensor: Location and testing

Well I'm done, guess I'll just wait till it goes in for other service and pay the guy $1000 to change that damn thing for me. In the mean time I'll just run it at 8.5-9 mpg till I see if maybe something else is causing this ridiculous mileage.

Thanks for the help everyone, Kirk out.
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Old 11-14-2013, 01:26 PM
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I have still been watching the data while I drive and even after the new sensor on the driver side I am still getting double digit LTFT (15-19) on BOTH sides when at idle and while off the throttle coasting. Research and logic has inclined me to believe that it may actually be a vacuum or exhaust leak since there is no change in LTFT on the driver side with the new sensor.

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  #27  
Old 11-14-2013, 09:37 PM
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Re: O2 sensor: Location and testing

You're right. Are you absolutely sure you don't have any exhaust leaks at the headpipe, or manifold to head connections? If you're still (after changing the front sensors) seeing virtually no change in LTFT at cruise or idle, I'd next take a real close look at this. Sometimes on deceleration and idle you will get double digit lean (I've never seen rich under these circumstances) readings, but the longer you sit at idle they'll normally correct back to near zero. Maybe Frank has some more ideas??
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  #28  
Old 11-15-2013, 08:49 AM
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Quote:
Originally Posted by jeepgcoman View Post
You're right. Are you absolutely sure you don't have any exhaust leaks at the headpipe, or manifold to head connections? If you're still (after changing the front sensors) seeing virtually no change in LTFT at cruise or idle, I'd next take a real close look at this. Sometimes on deceleration and idle you will get double digit lean (I've never seen rich under these circumstances) readings, but the longer you sit at idle they'll normally correct back to near zero. Maybe Frank has some more ideas??
Not sure about exhaust, if there is a leak it's not obvious. And the double digit numbers are on the + side and they are steady at idle, they don't go down.

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  #29  
Old 11-15-2013, 10:43 AM
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Re: O2 sensor: Location and testing

I started to change the front O2 sensors on my 07 WK 5.7L, spent half an hour dorking with the connector on the driver's side (including taking down the fender liner) with no luck, decided to wait for warmer weather.

Any hints from those who have managed to do it without dropping the transmission will be much appreciated.

thanks,
...tom
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Old 11-15-2013, 11:28 AM
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Quote:
Originally Posted by tomk View Post
I started to change the front O2 sensors on my 07 WK 5.7L, spent half an hour dorking with the connector on the driver's side (including taking down the fender liner) with no luck, decided to wait for warmer weather.

Any hints from those who have managed to do it without dropping the transmission will be much appreciated.

thanks,
...tom
That's so weird I could reach mine through the wheel well, must just be how they put them together at the factory.

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  #31  
Old 11-15-2013, 11:38 AM
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Re: O2 sensor: Location and testing

Does the STFT show the same positive high trend? Because they are the actual trim figures, any change you would first see here.
If they also still show double digit positive at idle and stable cruise, there most proba ly is some vacuum leak
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  #32  
Old 11-15-2013, 12:30 PM
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Quote:
Originally Posted by Frango100 View Post
Does the STFT show the same positive high trend? Because they are the actual trim figures, any change you would first see here.
If they also still show double digit positive at idle and stable cruise, there most proba ly is some vacuum leak
No the STFTs are normal.

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  #33  
Old 11-16-2013, 06:03 AM
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Re: O2 sensor: Location and testing

Low fuel pressure or dirty injectors will also cause the LTFT go into the positive high. I would measure the fuel pressure at the rail to be sure you don't have a fuel pressure regulator or fuel pump problem.
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  #34  
Old 01-10-2014, 10:41 AM
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Anyone no what the normal fuel pressure should be?

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  #35  
Old 01-14-2014, 02:35 AM
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Re: O2 sensor: Location and testing

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Originally Posted by phottomatt View Post
Anyone no what the normal fuel pressure should be?

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On the WJ its around 50 +- 5 PSI, so i would expect the same figures on a WK.
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  #36  
Old 01-14-2014, 10:54 AM
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Thank you very much, I found it just yesterday, it's 58+/-2 so pretty close.

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