knewell

Turbo boost valve

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Hi All,

First post on this site, but have been trawling through it over the last few months as have an acceleration/power problem and this has been really useful for help and research! 

Initially, I would lose acceleration intermittently or on hills, but more recently it has turned into a permanent loss of power where I struggle to accelerate all the time which made my motorway journey at 60mph (couldn't go any faster) quite fun. An engine light finally came on after struggling up a hill in second gear and the mechanic said I need to replace my turbo vacuum boost valve (VSV or part number 25819 27040). I am looking on ebay and saw there are two options:

Option 1: https://www.ebay.co.uk/itm/NEW-TURBO-BOOST-TOYOTA-RAV4-RAV-4-2001-2005-VACUUM-VALVE-1CDFTV-25819-27040-/252308245813

Valve.thumb.jpg.66b300ed15c38eaeae1560286f20762f.jpg

Option 2: https://www.ebay.co.uk/itm/223054880804

1679833521_valve2.thumb.jpg.c0dafc57c0a92170fe2d383a0cf928b2.jpg

Questions:

  1. Option 1 is 90 pounds and option 2 is 170 pounds. Assume option 2 is more expensive because it is apparently OEM, can anyone advise if I would be ok purchasing the cheaper option as it's a saving of 80 pounds. Is the OEM version going to be better?
  2. I notice the cheaper one is missing the black cap thing that option 2 has on top of the unit. Is this a critical element of the valve? Is it removable and therefore I might be able to recycle the original one? If so, would there be an issue reusing this cap?

Thanks in advance for any help you can offer!

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Hi Korre. I have one of these for sale, Toyota part that I purchased on ebay. I put it in the for sale section on this forum. Have a look in that section. This part definitely helped my problem though didn't cure completely. The we cap that is missing from the first picture is removable and is on ur own original boost valve, and not critical in my opinion. There could maybe be other possible cause's tho ur mechanic sound's pretty sure. Search power loss problem's on this forum. I hope u get it sorted, good luck.

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This fault has been misdiagnosed many times just a thought 

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1 minute ago, Longcock said:

This fault has been misdiagnosed many times just a thought 

Usually isn't that but I sopose it is possible 

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Thank you both, I ended up ordering one on eBay in the end which arrived today, so will fit it and see what happens.

If it doesn't work what do you suggest next? SCVs seems to be the most common answer? Can't help but feel this is an issue with no known fix, just trial and error till you replace the right part

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Yes I know I've been there and done it over the years I looked on this forum a few years ago and thought i needed scv.s so I bought some  £150 I was gutted against my better judgement. Anyway it wasn't them just see if that works fingers crossed at the end of the day the mechanic should know more than me. Let me know if it works I would love to know 

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Will let you know how it goes, planning to fit tomorrow. If not I'll move onto EGR valve clean and SCVs...issue is I don't know anything about cars, where the SCVs or EGR is or have a socket set. Lot's of youtube videos ahead of me I think...

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You tube has helped me a lot scvs are Allen key easy but last resort as very expensive good luck 

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Replaced the turbo boost valve...as you predicted still no acceleration 😞

Don't want to waste further money replacing parts it could be, might have to take it to Toyota/garage for a proper diagnosis as would rather fix the problem directly then keep guess.

Longcock, did you ever fix this? I called an idependent toyota specialist and he said without looking at my car and from his experience it is often a new turbo that is required due to sticking vanes. Foreign language to me, but sounds expensive.

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2 hours ago, knewell said:

Replaced the turbo boost valve...as you predicted still no acceleration 😞

 

Yes I will post later when I get home but there is a few people on this forum that know a lot more than me maybe one or two of them would like to step in and help? 

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If it is the vanes sticking clogging then I'm not sure why you would have to buy a new turbo you can free then. The easiest way I think is to undo the cat from the turbo then I know this sounds daft but spray Mr muscle oven cleaner must be the orange one because of aningredient it has . In to the turbo and fill it don't worry about using to much then put cat back on and leave it for 30 to 60 mins the longer the better then off you go sorted if that's what it is . Have you given your egr a good clean ?because that would be my first port of call .This is probably nonsense if you don't really mess with cars but if you know anyone who does then this should help but remember I haven't seen the car and I'm not a mechanic .just trying to help 

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Thanks Longcock

Mr Muscle?! How do you get it back out of the turbo? My dad is good with cars, so will get him round to help.

not sure if I should change SCVs for the sake of it. Haven’t even had the turbo diagnosed, just what the Toyota specialist I called suggested. 

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Car would need to be put  to be put on a good computer to get closer to the source of problem - I think. The SCV's can be cleaned to see if problem improve's. EGR can be blocked off totally or cleaned.  I wud try not to buy any more part's unless I was sure they were the problem, it cud end up being a very expensive elimination process buying thing's to see if they work. As I said I never cured mine completely, boost valve helped a bit, it was just a real pain. Get it connected to a computer.

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Thank you both for the replies so far, agree it  is probably wise to avoid buying more parts for the sake of it. I will check the EGR valve this weekend and on my way to Halfords now to try wynns diesel turbo cleaner. Some additive you put into your fuel which may help with sticking turbo vanes 

Aside from this, I guess I should start driving it Again to try and force an engine management code. At this point I can get someone to plug it in and diagnose it.

 Ant rav Did you ever fix yours, or just get rid of it?

 

 

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You don't remove it as it will remove it's self when engine is running and if you blank the egr you will need to get an egr delete As they electronic rather than diafram but can be done .

Happy tinkering 

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I simply could not fix it mate so got rid of it. My mechanic tried hard, he had it on his computer and said the problem seemed to be the valve. It was my decision to try the new valve. But my problem was an intermittent one,  the rav would loose power just when u needed it most - overtaking other car's etc dangerous. pulling in and switching off the car and then restarting and all was good again till the next time. But I took the boost valve I had bought, back off the car when I sold it and put the old one back on, and it was worse, so as I said the new valve helped but did not cure. I have read where people put new turbo's on and still no good, u cud spend a fortune on bit's and still have the problem. Frustrating. Maybe if ur dad help's to clean everything scv, turbo, maf sensor, egr. U might get lucky. There is plenty of reading on here regarding this Power Loss problem and hopefully other's on here might share their opinion's with u.Good luck.

( Forgot to say, mechanic did mention it cud be a problem with an injector. )

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Start simple, check MAF, clean, test and or replace with genuine only

Replace fuel filter, genuine Toyota

Then go from there

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Latest update: engine light came on today, got it diagnosed and code P0627 (fuel pump a circuit open) came up. Called the Toyota specialist near me and he said its the SCVs. Ordered the parts and going to replace tomorrow morning. Will let you know how it goes!

p.s. Added the Wynns diesel turbo cleaner and saw no noticeable improvement, which might suggest it isn't the turbo and replacing the SCVs is a good move. Who knows!

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Replaced SCVs on Saturday, taken on two long drives and driving like a dream. Planning to stop using supermarket fuel if posts on this site are true. Fingers crossed this has fixed it, will let you know if not. Thanks all! 

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