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Re: Which O2 sensor?
Posted by Dean (more from Dean) on Mon, 21 Jun 2004 06:48:42
In Reply to: Which O2 sensor?, Mattias.se, Mon, 21 Jun 2004 04:59:11
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Check the O2 sensor base ground resistances. Could be resistance in the exhaust system component joints etc.
If no faults with sensor grounds, could be both sensors at once (which seems not so probably), or low fuel pressure.
Check the VAC lines from TB to the MAP sensor, and from the TB to the fuel pressure regulator (FPR). If the FPR does not have a good VAC line, then the miture will be rich at idle and lean when on power. When the boost indicator shows around lower edge of yellow, the AF would be good.
A worn fuel pump or very restricted fuel filter could also create lean running. Or a bad FPR.
Might be a good idea to look at the plugs. The system can/might signal lean when the AF is still ok, but the system sees that it is needing to make extreme compensation to stay in the proper AF range.
posted by 68.93.19...
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