Jump to content
Do Not Sell My Personal Information

1.8F petrol engine coming back to idling slow


Recommended Posts


In the link you will find a video with me revving the car. 2006 S40 1.8F (petrol) Volvo. As I educated myself the same engine has been mounted on the Focus 2 and other Fords.
I think once I release the gas pedal it comes to the idling point pretty slow.
It's also weird to drive. When shifting quicker it always surprises me with some energy left in those revs.
I also noticed that driving downhill in "engine brake" manner will not result in a 0.0 instant consumption reading. It will go from 5l/100km to 0.0 in about 20sec of full engine brake at aprox 3000 rpm.

A bit of history:
1. Bought the car recently.
2. Had the P2008 code, engine light on. Replaced the solenoid valves that control some swirl things. Light went of, code didn't appear anymore.
3. Seeing the slow response went back to the shop, found the 1549 code with the intermittent mention. Apparently it refers to the intake manifold flap. Cleaned it, the car drives the same, the code did not appear yet (it doesn't light any bulbs on the dash).

Any idea is welcomed/valued.


Link to comment
Share on other sites

4 hours ago, CalinBradatan said:

once I release the gas pedal it comes to the idling point pretty slow.

To me, it looks like the throttle body may be gummed up with viscous oily gunk, or something. So it is responding, but slowly. I suspect it is motor driven open, then spring driven closed. That would be easier & cheaper than reverse driving the motor.

If it was too slow, then an error code would show up. But the response time on the video may be quick enough to avoid the DTC, but slow enough to be annoying.

I do not see any way the intake runner or swirl valves could cause this delay. Closing the throttle should cut both the air & fuel, regardless of these intake devices.

Link to comment
Share on other sites

Join the conversation

You can post now and register later. If you have an account, sign in now to post with your account.

Reply to this topic...

×   Pasted as rich text.   Paste as plain text instead

  Only 75 emoji are allowed.

×   Your link has been automatically embedded.   Display as a link instead

×   Your previous content has been restored.   Clear editor

×   You cannot paste images directly. Upload or insert images from URL.


  • Create New...