2004 Volvo V40 4 cyl Front Wheel Drive Automatic 98,000 miles
So this Volvo seems to act up with a hesitation after the fuel tank is filled. After accelerating it is fine and never comes back until next tank fill.
(PDF of freeze frame and recorded data can be supplied in PDF.)
Engine light on, Code P0171
Scanner displays at
idle the MAF reading of 0.31 Lbs/Min
At 2000rpm MAF reads 0.87 lbs/min=6.57 g/s
Did notice that at idle the TPS reads 12%? But that would actually richen it up I would think?
Temp sensor and all sensor data looks good, O2 Sensor switches normally. Rapidly at 2000rpm, less rapidly at idle but still switches well at idle. Only thing I did notice on o2 was after throttle blip it hesitates for a second or so before dropping and switching again.
Checked thoroughly for vacuum leaks, none found, tested engine vacuum, nice steady 18 at idle, looks good when run through rpm.
Fuel pressure is well within specs,
Replaced spark plugs and fuel filter for good measure.
It is a turbo charged engine and am concerned I may be overlooking something.
Please any help is good help.
Wednesday, October 27th, 2010 AT 6:06 PM