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High MPG High CO
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Old 06 Mar 2007, 05:35 PM   #1 (permalink)
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High MPG High CO

Hello, I'm working on a 1995 WRX STi. The problem is: higher than normal MPG, cutting out on tickover (not all the time.....).
Can someone please tell me:
Where's the temp sensor for the ECU?
Is the idle CO adjustable?
Is the idle speed adjustable?

The CO was around 1.5%-2% at 2500rpm with Cat fitted, the rest of emissions were OK.
An oygen sensor was fitted 2K miles ago owing to open circuit heater element, it was a universal type)
It is a one sensor system.
Are the fault codes accessible without a code reader, if so how?
MPG is less than 150 miles per tank, it used to be 190ish...
If you raise the engine speed to just above idle, there is a clicking around the MAP? sensor area, is this normal (it's like a relay ticking on and off)?
Thanks Ian
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Old 06 Mar 2007, 05:37 PM   #2 (permalink)
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MAF maybe?

have you had it connected up to a diagnostic machine to see if its kicking out any fault codes?
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Old 06 Mar 2007, 05:51 PM   #3 (permalink)
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Check for fault codes

Info here http://www.saxonfields.freeserve.co....iag%20Page.htm
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Old 06 Mar 2007, 07:01 PM   #4 (permalink)
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lamba goosed or giving incorrect readings would be my call...............
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Old 06 Mar 2007, 09:54 PM   #5 (permalink)
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Thanks a good link. It will help a lot.
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Old 08 Mar 2007, 09:42 AM   #6 (permalink)
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let us know how u get on.
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Old 17 Oct 2007, 01:42 PM   #7 (permalink)
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Hi, it was a duff lambda sensor cured after MOT failure. Thanks everyone.
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Old 17 Oct 2007, 02:09 PM   #8 (permalink)
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lamba goosed or giving incorrect readings would be my call...............
Good call Alyn.
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