C30 Engine : - Acceleration issues on 2009 C30 2.0D Auto

Schern · Apr 13th, 2018, 18:08

Hi, I'm having issues with the car. From cold there is an issue where on a constant throttle the car will act as though there is no throttle input. Coming off and on the throttle will cause the car to accelerate again but once back to throttle input being sufficient to maintain the current speed the car will go back to acting like the throttle has been released and starts slowing down. It makes roundabouts and slip roads a bit exciting! I kind of half suspect the EGR valve, I wonder if its sticking but could also be throttle position sensor I suppose. No engine lights seen so far but I plan to put a code reader on it this weekend. Any suggestions as to what the cause could be? Thanks in advance!

Schern · Apr 23rd, 2018, 07:46

Seem to have solved it. Posting in case it’s of use to anyone else.

I did two things, suspect it was the second that resolved the issue.

Firstly I took the butterfly mechanism off the inlet manifold, removed both sensors and gave them a clean. The temp sensor was covered in oil residue so gently cleaned that off. Checked the hole in the MAP sensor wasn’t blocked and that the butterfly valve was free moving and cleaned oil residue off it. Reassembled.

The second thing I did which I think is what fixed it was basically messed up. Discovered the bleed valve on the top of the fuel filter body. Opened it. Let air in to the system and the car stalled. Spent ages trying to bleed it through. Tried to open the filter housing but it was very very tight. Probably turned it through 90 degrees then thought better of it and tightened it down again. Finally managed to get the system bled through and took it for a run to clear any air bubbles. Gave it a good thrash in low gears. No problems since. Not sure if there was an airlock or maybe a dirty/compromised seal in the filter housing (either one of the bleed screws or the main seal itself) slowly letting air in to the system when it was stood for a few hours but my fiddling seems to have resolved it.

If symptoms return the first thing I’ll do will be take the engine cover off and watch the fuel lines for air bubbles travelling through the system when first started from an overnight stand (thank you Volvo for using clear line!). Hope this may be of use to someone else.

Apr 13th, 2018, 18:08	#1
Schern New Member Last Online: Apr 23rd, 2018 07:46 Join Date: Apr 2018 Location: Peterborough	Acceleration issues on 2009 C30 2.0D Auto Hi, I'm having issues with the car. From cold there is an issue where on a constant throttle the car will act as though there is no throttle input. Coming off and on the throttle will cause the car to accelerate again but once back to throttle input being sufficient to maintain the current speed the car will go back to acting like the throttle has been released and starts slowing down. It makes roundabouts and slip roads a bit exciting! I kind of half suspect the EGR valve, I wonder if its sticking but could also be throttle position sensor I suppose. No engine lights seen so far but I plan to put a code reader on it this weekend. Any suggestions as to what the cause could be? Thanks in advance!

Apr 23rd, 2018, 07:46	#2
Schern New Member Last Online: Apr 23rd, 2018 07:46 Join Date: Apr 2018 Location: Peterborough	Seem to have solved it. Posting in case it’s of use to anyone else. I did two things, suspect it was the second that resolved the issue. Firstly I took the butterfly mechanism off the inlet manifold, removed both sensors and gave them a clean. The temp sensor was covered in oil residue so gently cleaned that off. Checked the hole in the MAP sensor wasn’t blocked and that the butterfly valve was free moving and cleaned oil residue off it. Reassembled. The second thing I did which I think is what fixed it was basically messed up. Discovered the bleed valve on the top of the fuel filter body. Opened it. Let air in to the system and the car stalled. Spent ages trying to bleed it through. Tried to open the filter housing but it was very very tight. Probably turned it through 90 degrees then thought better of it and tightened it down again. Finally managed to get the system bled through and took it for a run to clear any air bubbles. Gave it a good thrash in low gears. No problems since. Not sure if there was an airlock or maybe a dirty/compromised seal in the filter housing (either one of the bleed screws or the main seal itself) slowly letting air in to the system when it was stood for a few hours but my fiddling seems to have resolved it. If symptoms return the first thing I’ll do will be take the engine cover off and watch the fuel lines for air bubbles travelling through the system when first started from an overnight stand (thank you Volvo for using clear line!). Hope this may be of use to someone else.

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