A couple screen shots with a question.
A couple screen shots with a question. I took a screen shot of my cruise scan, I can't seem to figure out what I've done wrong but right in the RPM area you see I have a bad surge and my LTFT's look like crap.
Can anyone give me some advice on where to start correcting this ?
Thanks
Jamie
Can anyone give me some advice on where to start correcting this ?
Thanks
Jamie
TECH Fanatic
Joined: Aug 2005
Posts: 1,691
Likes: 1
From: Sunny London, UK
Hi might be easier to paste in the line dash instead of the dial one.
Also your O2's for bank 2 are wrong you have bank 1 sensor 2 instead of bank 2 sensor 1.
When you say surge do you mean missing? bogging? lerching? etc.
Are you just cruising? Accelerating etc?
The line chart will show us that.
Also your O2's for bank 2 are wrong you have bank 1 sensor 2 instead of bank 2 sensor 1.
When you say surge do you mean missing? bogging? lerching? etc.
Are you just cruising? Accelerating etc?
The line chart will show us that.
Originally Posted by ringram
Hi might be easier to paste in the line dash instead of the dial one.
Also your O2's for bank 2 are wrong you have bank 1 sensor 2 instead of bank 2 sensor 1.
When you say surge do you mean missing? bogging? lerching? etc.
Are you just cruising? Accelerating etc?
The line chart will show us that.
Also your O2's for bank 2 are wrong you have bank 1 sensor 2 instead of bank 2 sensor 1.
When you say surge do you mean missing? bogging? lerching? etc.
Are you just cruising? Accelerating etc?
The line chart will show us that.
I'll fix that and take another look at it with the line dash.
When I say its surging I mean it bucks right in this area.
As for the throttle cracker table I have not done anything to it.
Thanks for the replies.
TECH Apprentice
Joined: Oct 2004
Posts: 360
Likes: 0
From: Katy, TX
Have you tuned your VE or RAF tables? I'm guessing not from the super rich LTFT's and the fact that the IAC is commanding 310 steps. Even though you have the rear driver side voltage O2, you can look at the correct one you are scanning and tell the LTFT are really off as stoich is 450 mV. Let us know what you've tuned so we can help you out. You can send me a copy of your tune if you'd like along with a correct log. I can get you going in the right direction. 
You should capture a plot of the O2 switching
waveforms (chart view or whatever you call it).
Scroll through it and see whether the O2s are
switching symmetrically or are mostly low with
an occasional jump-up, uneven-looking. This will
tell you whether it's an O2 problem driving bad
mixture & trimming, or something else.
waveforms (chart view or whatever you call it).
Scroll through it and see whether the O2s are
switching symmetrically or are mostly low with
an occasional jump-up, uneven-looking. This will
tell you whether it's an O2 problem driving bad
mixture & trimming, or something else.
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