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Tec Q on a V40 S40-V40

posted by  someone claiming to be EAN on  Tue Apr 8 21:42 CST 2003 [RELATED]

Hope there are some other good Volvo Tech on this board that can ansver my Q.

History:
The car is a V40 from 98 it is a B4204S and it has around 180.000 km on the counter.
Suddently the milage drops from around 12km/litre to 8 km litre only other sympton is a slight rough idle (not much but it is pendling around 750-800 rpm)it is same owner etc. so it is probably not due to changes in driving habits. Engine dosent use any oil or water.

This has been done:
-Plugs oil and all filters changed.
-Compresion check of all cylinders - 14kg - all ok
-Inspection of cylinders with endoscope - all ok
-Idle motor changed.
-Potientiometer in gas valve renewed.
-No fault codes in computer
-All gaskets/pipes in inlet manifold chacked for laeque
-Fuel injectors dismantled and cleaned and checked for spray pattern flow etc.

Still only gets 8 km/litre.

I am runing out of ideas can anyone help?

My last ideas:
-Could it be the Lambda sond (no fault codes!)
-Could it be the catalytic converter - and what would the symptons be form a bad cat?

Any other ideas?











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New Tec Q on a V40 [S40-V40]
posted by  someone claiming to be EAN  on Tue Apr 8 21:42 CST 2003 >


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