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Old 06-06-2014, 11:27 AM   #1
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High Air/Fuel ratio

Recently my 95gt a/f ratio has been pretty high, it will range from anywhere between 15- 18, and its been going over 18 a lot more frequently. At idle it will jump from 14.5-17. Its naturally aspirated. Was curious to see if anyone else has had a similar problem. My best guess would be possibly dirty injectors? Maybe fuel filter needs to be replaced? I can't seem to find a straight answer online so far, thanks.
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Old 06-06-2014, 12:02 PM   #2
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What wideband are you using to measure the Air/Fuel ratio with? How long as it been installed for and how long have you been using the same oxygen sensor for the wideband? Also, whens the last time it was recalibrated (if it can be calibrated)?

There's a really good chance the wideband is just not reading accurately for one of the several reasons above. Keep that in mind before looking for any mechanical issues.

Hope this helps!

Shane
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Old 06-06-2014, 12:59 PM   #3
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It's an AEM digital wideband, it came with the car. not sure how long ago, or if the sensor was ever replaced. I've had the car for about 3 months now, and not totally sure how to even go about re calibrating the wideband. ive done a couple mods here and there since ive got it, but nothing i can think of that would actually affect the wideband reading.
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Old 06-09-2014, 03:04 PM   #4
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When are you getting this reading?


If this reading is from idle then it will raise and dip all the time. Your car also uses timing to help control the idle.
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Old 06-09-2014, 04:30 PM   #5
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Yeah I figured when idling, it would be all over the place, but its random all the time. Obviously at wot it stays more around 13ish but city driving and highway will be totally random

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Old 06-09-2014, 06:50 PM   #6
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That's normal then.
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Old 06-09-2014, 10:16 PM   #7
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Even though it will go past 18 for periods at a time? When I first got the car 3 months ago it never went past 18, now it frequently does it alot

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Old 06-09-2014, 10:17 PM   #8
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^^^^

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Old 06-10-2014, 10:48 AM   #9
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Ok let's start from the beginning.


You got the car 3 months ago.....have you done:


A full tune up? Cap, rotor, wires, plugs, fuel filter (obviously not), clean the MAF, PCV valve and screen?


Run your codes? What came out?


What's your timing?


What's your fuel pressure?

Where is the wideband installed?


A lot of factors come into play than just a gauge with numbers.
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