S60 R - hesitation & slight loss of power

Fitzy · Mar 17th, 2010, 11:58

All of the posts related to anything similar seem to have been moved. I have a 2004 S60 R and I am experiencing slight hesitations when I accelate and in the mornings after drive a short distance and come to a stop the rev's often drop to about 400 and then spike to about 1,100 and then back to normal at 700. It has yet to cut out but it gets very close. I have had the dealer clear out the throttle housing but this made no difference.

When I accelerate somtimes it is fine and other times there is a slight hesitation at all different rev's - it seems to be intermittent but getting worse.

Over a year ago, I have had my volvo main dealer upgrade my ECU to take out the 3,000rpm's flat spot that some of you may know about. I was never confident it was idling pefectly after the upgrade was done. But at the same time I got a fully service, spark plugs, fuel and oil filter change etc. So it could be any number of these?

Has anyone had any simliar problems and been able to solve this?

I am going to get it plugged in, but as there are no warning lights etc, this is not likely to show anything. Any info/advise would be much appreciated.

jamie28 · Mar 21st, 2010, 16:06

Could be the fuel pressure sensor or boost control solenoid

GRN Motors · Mar 22nd, 2010, 00:12

A customers S60R was doing similair things, there was no warning lights on the dash, yet it would drive with no power, and when it did have power it would be very hesitant and run rough.

it turned out to be the MAF sensor on that one.

i would recommend getting it read anyway to cancel anything else out.

hth

chad

Fitzy · Mar 22nd, 2010, 00:26

Thanks Jamie 28 and GRN Motors. It turned out to be a Knock Sensor that was not making a proper connection. Running perfectly again but was the cause of the car not running great at idle for the past 14 months. I knew it was electrical.....thanks for the advise anyway

GRN Motors · Mar 22nd, 2010, 10:55

cool. Glad you got it sorted.

Mar 17th, 2010, 11:58	#1
Fitzy Fitzy Last Online: Dec 3rd, 2010 21:46 Join Date: Mar 2010 Location: Cork	S60 R - hesitation & slight loss of power All of the posts related to anything similar seem to have been moved. I have a 2004 S60 R and I am experiencing slight hesitations when I accelate and in the mornings after drive a short distance and come to a stop the rev's often drop to about 400 and then spike to about 1,100 and then back to normal at 700. It has yet to cut out but it gets very close. I have had the dealer clear out the throttle housing but this made no difference. When I accelerate somtimes it is fine and other times there is a slight hesitation at all different rev's - it seems to be intermittent but getting worse. Over a year ago, I have had my volvo main dealer upgrade my ECU to take out the 3,000rpm's flat spot that some of you may know about. I was never confident it was idling pefectly after the upgrade was done. But at the same time I got a fully service, spark plugs, fuel and oil filter change etc. So it could be any number of these? Has anyone had any simliar problems and been able to solve this? I am going to get it plugged in, but as there are no warning lights etc, this is not likely to show anything. Any info/advise would be much appreciated.

Mar 21st, 2010, 16:06	#2
jamie28 Member Last Online: Aug 22nd, 2021 12:03 Join Date: Dec 2001 Location: middlesex	Could be the fuel pressure sensor or boost control solenoid __________________ I unleash my hammer with sadistic intent

Mar 22nd, 2010, 00:12	#3
GRN Motors Chad Last Online: Jan 13th, 2017 16:39 Join Date: Aug 2006 Location: Birmingham	A customers S60R was doing similair things, there was no warning lights on the dash, yet it would drive with no power, and when it did have power it would be very hesitant and run rough. it turned out to be the MAF sensor on that one. i would recommend getting it read anyway to cancel anything else out. hth chad __________________ Independant Volvo Specialists RICA Authorised Distributor (www.rica-uk.com) Shark Performance Authorised Distributor (www.sharkperformance.co.uk) www.grnmotors.co.uk (site under construction) info@grnmotors.co.uk

Mar 22nd, 2010, 10:55	#5
GRN Motors Chad Last Online: Jan 13th, 2017 16:39 Join Date: Aug 2006 Location: Birmingham	cool. Glad you got it sorted. __________________ Independant Volvo Specialists RICA Authorised Distributor (www.rica-uk.com) Shark Performance Authorised Distributor (www.sharkperformance.co.uk) www.grnmotors.co.uk (site under construction) info@grnmotors.co.uk

Mar 22nd, 2010, 00:26	#4
Fitzy Fitzy Last Online: Dec 3rd, 2010 21:46 Join Date: Mar 2010 Location: Cork	Thanks Jamie 28 and GRN Motors. It turned out to be a Knock Sensor that was not making a proper connection. Running perfectly again but was the cause of the car not running great at idle for the past 14 months. I knew it was electrical.....thanks for the advise anyway

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