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S40 new member help with misfire and p2110

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Old Aug 1st, 2015, 16:45   #1
Sciroccotune
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Default S40 new member help with misfire and p2110

Hi guys,

Just joined so hello to you all

I'm after some help with my friends 2005 55 plate 1.8 s40. He has had it since new and its been very reliable but in the last week it has developed a fault that has gone from intermittent to every time you drive.

Basically the car starts up and but the revs are high and if you push the accelerator the revs take drop a bit to slow. After about 50m of driving the car goes into a limp mode and the engine runs like its on 2 cylinders and you get a message reduced engine performance / limp mode. It's so bad it can't really be driven.

In the last few days I have replaced the throttle body and an O2 sensor but still get the same fault code
P2110 forced reduced rpm.

I have tested the whole engine side loom and all checks out, I am now thinking PCM /ECU.

Any advice that saves me having to take it Volvo would be amazing

Thanks

Chris
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Old Aug 1st, 2015, 17:32   #2
XcOM
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Check the CEM contacts, if they are dirty or loose all sorts of magic things happen, are the injectors clean and clear, that could be another thing
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Old Aug 1st, 2015, 17:55   #3
Sciroccotune
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Thanks for the reply,

I haven't checked the cem but will do, is it under the drivers side dash panel (UK car)?


Thanks
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Old Aug 2nd, 2015, 12:16   #4
XcOM
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it's under the passenger footwell



Reverse the image for UK car's, so in otherwords, its under the glovebox, kill all power before you touch it though.
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Old Aug 4th, 2015, 10:37   #5
Sciroccotune
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Thanks, everything looked fine with it.
Sadly the car is now booked in with Volvo for diagnostic on Thursday.

Will roport back in case it can help other members in the future
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Old Aug 12th, 2015, 11:47   #6
Sciroccotune
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Hi all,

I finally sorted the issue. Volvo couldn't figure it out which was a wast of time!

Finally found that the breather pipe on the back of the manifold was perished and split. Had to remove the whole manifold and replace the pipe. It can not be accessed with out fully removing the manifold

Pipe was 32 pounds from Ford or Volvo and it's about 4 inches long.
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Old Nov 19th, 2016, 23:14   #7
Tolemy
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Default P2110 forced reduced rpm

P2110 forced reduced rpm

I have a 2005 V50 1.8i and recently got the code P2110 forced reduced rpm. I got this code after high rpms at cold start (1500-2000rpm) then dropping to 1000prm. If I drove off the car would move into limp mode and there would be engine no power.

If I let the car warm up for 5mins. this did not happen, but the revs would not reduce to below 1000rpm.

In general the rpms always dropped more slowly than normal after revving so I looked for vacuum leaks but found none.

I let the car warm up and used it this way for a while, but the problem got worse. Higher rpm (up to 3000rpm) when starting from cold and going into limp mode. I could pull over stop and restart the engine, this reset the engine out of limp mode and I could use the car again.

Also when coming to a halt at traffic lights with the car in neutral the rpms would rise to 1500-2000rpm and drop again without my foot on the accelerator. I collected the ODB data stream during these events and the MAP sensor reading was varying rather than steady. Hence I think the computer was compensating for an inlet pressure change by revving the engine.

Finally I decided it must be the MAP sensor or PCV valve. Removing the inlet manifold I found a split breather pipe and replaced the PCV valve since I am close to 100,000 miles. Shaking this valve it sounded a bit sticky not a very scientific test.

Now the car is back to normal, close to 750-800rpm when warm and rpms drop quickly after revving.

My part numbers were:
1) PCV valve from Volvo part no. 30711779 cost 28.80+VAT
2) Breather pipe with clips attached Volvo part no. 30777588 cost 13.20+VAT
3) Due to the age of the car I also changed the manifold gaskets since they were hard and not very flexible 14.67 inc VAT. They are the same as on a Ford CMAX MPV 1.8i.

Hope this will help someone.
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Old Oct 19th, 2019, 15:37   #8
Scrannigan
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Quote:
Originally Posted by Tolemy View Post
P2110 forced reduced rpm

I have a 2005 V50 1.8i and recently got the code P2110 forced reduced rpm. I got this code after high rpms at cold start (1500-2000rpm) then dropping to 1000prm. If I drove off the car would move into limp mode and there would be engine no power.

If I let the car warm up for 5mins. this did not happen, but the revs would not reduce to below 1000rpm.

In general the rpms always dropped more slowly than normal after revving so I looked for vacuum leaks but found none.

I let the car warm up and used it this way for a while, but the problem got worse. Higher rpm (up to 3000rpm) when starting from cold and going into limp mode. I could pull over stop and restart the engine, this reset the engine out of limp mode and I could use the car again.

Also when coming to a halt at traffic lights with the car in neutral the rpms would rise to 1500-2000rpm and drop again without my foot on the accelerator. I collected the ODB data stream during these events and the MAP sensor reading was varying rather than steady. Hence I think the computer was compensating for an inlet pressure change by revving the engine.

Finally I decided it must be the MAP sensor or PCV valve. Removing the inlet manifold I found a split breather pipe and replaced the PCV valve since I am close to 100,000 miles. Shaking this valve it sounded a bit sticky not a very scientific test.

Now the car is back to normal, close to 750-800rpm when warm and rpms drop quickly after revving.

My part numbers were:
1) PCV valve from Volvo part no. 30711779 cost 28.80+VAT
2) Breather pipe with clips attached Volvo part no. 30777588 cost 13.20+VAT
3) Due to the age of the car I also changed the manifold gaskets since they were hard and not very flexible 14.67 inc VAT. They are the same as on a Ford CMAX MPV 1.8i.

Hope this will help someone.
I think this is exactly what I'm experiencing, done the CEM, throttle body and all that stuff, only just found this post about the breather hose, how much of a ball ache is it to do, I'm quite mechanically inclined, but never had to remove a manifold before
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