Is this the end?

Vacu · Jun 11th, 2016, 13:12

Hello All,

Driving down the motorway 70mph no problem then after 20 miles all of sudden dramatic power loss.

Now very slow to get the revs up and even when they do climb very little power, going up hill and pulling away almost impossible. No lights showing on dash, checked vac pipes as best I can, all seem okay. Disconnected MAF, no difference. Changed air and fuel filters 5k ago with genuine Volvo.

Any ideas chaps?

druid · Jun 11th, 2016, 13:16

The ever popular N75 valve?

Vacu · Jun 11th, 2016, 13:29

Cheers Druid, is there a way of checking and repairing it?

cheshired5 · Jun 11th, 2016, 14:40

Quote:

Originally Posted by Vacu

is there a way of checking and repairing it?

https://www.youtube.com/watch?v=dkPuEmwP4oQ

Vacu · Jun 11th, 2016, 14:53

thanks chesh, i'm going to give it a go

skyship007 · Jun 11th, 2016, 15:14

Before you start buying lots of parts, it would be a real good idea to get the hidden fault codes read.

volvoid · Jun 11th, 2016, 15:20

The End is Nigh

ilikewatch · Jun 11th, 2016, 16:35

Quote:

Originally Posted by skyship007

Before you start buying lots of parts, it would be a real good idea to get the hidden fault codes read.

I'd second this, - get the codes read if there's no obvious fault. If your car is a 2003/2004 model you may be able to read them which a cheapo ELM327 reader costing a couple of quid, otherwise it will need a professional diagnostics setup or original/clone DiCE.

Vacu · Jun 11th, 2016, 17:27

mechanic says no fault codes showing. mechanic thinks most likely a blocked cat?

cleaned n75 as per chesh's video but shows no improvement.

when i disconnect the n75 vac pipes there is some improvement in power ie: it doesn't stall from stationary up a camber.

not mentioned before, there's quite a bit of greyish smoke when revved this also improves when i disconnect the n75?

i've rechecked all vac pipes all seems good.

thanks for replies so far

skyship007 · Jun 11th, 2016, 17:55

Quote:

Originally Posted by Vacu

mechanic says no fault codes showing. mechanic thinks most likely a blocked cat?

cleaned n75 as per chesh's video but shows no improvement.

when i disconnect the n75 vac pipes there is some improvement in power ie: it doesn't stall from stationary up a camber.

not mentioned before, there's quite a bit of greyish smoke when revved this also improves when i disconnect the n75?

i've rechecked all vac pipes all seems good.

thanks for replies so far

Make 100% sure your mechanic is using the correct code reader, as many have a habit a sayiing there are no codes as a result of using the wrong code reader.

It's very unlikely that the CAT is at fault, as they don't seem to block. About the only reason for replacing one is when it fails the MOT due to corrosion of the outer can.

Jun 11th, 2016, 13:12	#1
Vacu Member Last Online: Dec 28th, 2022 14:29 Join Date: May 2015 Location: London	Is this the end? Hello All, Driving down the motorway 70mph no problem then after 20 miles all of sudden dramatic power loss. Now very slow to get the revs up and even when they do climb very little power, going up hill and pulling away almost impossible. No lights showing on dash, checked vac pipes as best I can, all seem okay. Disconnected MAF, no difference. Changed air and fuel filters 5k ago with genuine Volvo. Any ideas chaps? __________________ V40 - 2002 - Diesel T - 161k miles

Jun 11th, 2016, 13:16	#2
druid V40 Owner Last Online: Dec 13th, 2020 01:28 Join Date: Aug 2006 Location: Tonyrefail, Souh Wales. View Photos By: druid	The ever popular N75 valve? __________________ *An MS Warior living one day at a time* "Neville" 207,000 so far. Water use 0 - oil negligible....

Jun 11th, 2016, 13:29	#3
Vacu Member Last Online: Dec 28th, 2022 14:29 Join Date: May 2015 Location: London	Cheers Druid, is there a way of checking and repairing it? __________________ V40 - 2002 - Diesel T - 161k miles

Jun 11th, 2016, 14:53	#5
Vacu Member Last Online: Dec 28th, 2022 14:29 Join Date: May 2015 Location: London	thanks chesh, i'm going to give it a go __________________ V40 - 2002 - Diesel T - 161k miles

Jun 11th, 2016, 15:14	#6
skyship007 Premier Member Last Online: May 2nd, 2018 08:14 Join Date: Sep 2011 Location: DownSouth	Before you start buying lots of parts, it would be a real good idea to get the hidden fault codes read. __________________ 2003 V40 1.9TD Mods: Scratches, bent bumpers, raised REAR mats & internal mud guards. SHELL ULTRA 5/40 & LIQUI MOLY CERATEC. Everyone should DYOR (Do Your Own Research)

Jun 11th, 2016, 15:20	#7
volvoid Monster Raving Loony Last Online: Nov 12th, 2018 20:03 Join Date: Oct 2013 Location: hitchin	The End is Nigh __________________ 1994 850 2.0 bought at 32,000 miles used daily now 45,000. Still like a nearly-new car 2004 filthy polluting diesel VW

Jun 11th, 2016, 17:27	#9
Vacu Member Last Online: Dec 28th, 2022 14:29 Join Date: May 2015 Location: London	mechanic says no fault codes showing. mechanic thinks most likely a blocked cat? cleaned n75 as per chesh's video but shows no improvement. when i disconnect the n75 vac pipes there is some improvement in power ie: it doesn't stall from stationary up a camber. not mentioned before, there's quite a bit of greyish smoke when revved this also improves when i disconnect the n75? i've rechecked all vac pipes all seems good. thanks for replies so far __________________ V40 - 2002 - Diesel T - 161k miles Last edited by Vacu; Jun 11th, 2016 at 17:32.

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