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Power drops off like towing a truck when car gets to temperature

Help, Advice, Owners' Discussion and DIY Tutorials devoted to the second generation C70, S40 and V50 Volvos -- awkwardly model year 2004 ½ onwards -- plus where to go for advice and discussion on Volvo's sporty C30 Coupe powered by Volvo's ubiquitous inline 5-cylinder power plant.
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Scooby750
Posts: 10
Joined: Wed Sep 14, 2016 1:26 am
Year and Model: S40 2005
Location: Birmingham

Power drops off like towing a truck when car gets to temperature

Post by Scooby750 »

Hi guys I've a Volvo s40 2005 1.8s
I've just changed a damaged valve and valve stem seals & piston rings as when I purchased car two weeks ago it had only 30 psi on cylinder one this is now all good :)
But now the car starts runs and sounds great till you get to half way on temp gauge then it looses power like your towing the titanic :( and lumpy idle too and tough restart :(
I've cleaned egr as that came up on diagnostic but no difference any ideas please help would be great fully appreciated

Scooby750
Posts: 10
Joined: Wed Sep 14, 2016 1:26 am
Year and Model: S40 2005
Location: Birmingham

Post by Scooby750 »

Done the usual plugs air filter oil still no joy emissions are good it flew the mot today but just the loss of power when up to temp :(

Scooby750
Posts: 10
Joined: Wed Sep 14, 2016 1:26 am
Year and Model: S40 2005
Location: Birmingham

Post by Scooby750 »

Update I've now changed egr for new and still no difference help or advice desperately needed

difflock54
Posts: 471
Joined: Sun Sep 23, 2012 9:45 pm
Year and Model: V40 Nordic 2002
Location: Wellington. New Zealand.
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Post by difflock54 »

Could it perhaps relate to your engine temperature sensor? That adjusts the fuel mixture and also adjusts the timing when the normal engine temp' is reached.
Have you noticed that the car is running richer, maybe black exhaust smoke and/or increased fuel consumption?
Worth checking off the list anyway.

Scooby750
Posts: 10
Joined: Wed Sep 14, 2016 1:26 am
Year and Model: S40 2005
Location: Birmingham

Post by Scooby750 »

Have got new switch on order should have today no smoke at all :( confused

difflock54
Posts: 471
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Year and Model: V40 Nordic 2002
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Post by difflock54 »

This link explains my previous comments.

https://www.yourmechanic.com/article/sy ... ure-switch

Scooby750
Posts: 10
Joined: Wed Sep 14, 2016 1:26 am
Year and Model: S40 2005
Location: Birmingham

Post by Scooby750 »

Update I've now changed temp sender in back of cylinder head and cleaned map sensor now as I had to remove intake manifold as the torque head screw had rusted up and seized in
This has made a good improvement on its power but same again as soon as temp gauge gets towards half way it goes flat as a pancake again
I can only change map sensor now to try to fix if that don't work I'm up a creek without a paddle unless I change the knock sensor if it has one the crank sensor and the cam sensor but I'm hemeraging money on his car now and at my wits end :(

Scooby750
Posts: 10
Joined: Wed Sep 14, 2016 1:26 am
Year and Model: S40 2005
Location: Birmingham

Post by Scooby750 »

It's the 1.8 petrol duratec engine B4184S11 code if this of any help

Scooby750
Posts: 10
Joined: Wed Sep 14, 2016 1:26 am
Year and Model: S40 2005
Location: Birmingham

Post by Scooby750 »

Thank you for you input difflock54 look forward to any more if you can help

MadeInJapan
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Joined: Thu Mar 31, 2005 7:14 am
Year and Model: '98 S70 T5 '07S40T5
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Post by MadeInJapan »

Sorry I can't offer you any more help than others here
'98 S70 T5 Emrld Grn Met/Beige Tons of Upgrades Mobil-1
'04 V70 2.5T Red/Taupe Some Upgrades Mobil-1
'07 S40 T5 AWD 6 speed manual! Silver/Black Stage1 Heico & Elevate
'07 S60 2.5T Blue/Taupe- my kid's Volvo

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