Carbon build up on intake valves(THP)

[colganraz]

Any idea on cost yet jamie? Can you do timing aswell?

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[Jamie@SPTuning]

It will be around £200 looking at other companies pricing for the same service.

[Jamie@SPTuning]

Yes, we have the tools to do the timing chain...pretty easy job

[colganraz]

Thats a very fair price, i think my timing has slipped a little so i am gonna get the timing done, would you know what sort of price that would be? Im getting both done this year so would make sense to get them both done in the same place at the same time!

[sh0wtime]

i saw earlier somebody mentioned BG 44K. that is definitely one of the better fuel treatments on the market as it does actually work
trouble is though with direct injected engines the fuel (inc additive) doesn't really ever get to contact the rear of the inlet valve.
For the same reasons a Terraclean service would be unable to effectively clean these areas as it interupts the fuel system & enters the combustion chamber via the injector so cleaning the backs of the valves isn't immediately easy...
BG products also do a fluid called ISC (induction system cleaner). http://www.bgprod.co.uk/AutoProducts/Fuel&Air/211.htm
They say you should use it in conjunction with a machine that they supply BUT we have used it at work via one of the plastic brake cleaner spray bottles (the ones where you unscrew the top to fill it then pump it up manually). we've only used the diesel specific version on diesels so far (reckon it should be OK on petrol too) http://www.bgprod.co.uk/AutoProducts/Fuel&Air/246.htm
but it has been very effective because unlike pretty much all the other treatments this one goes into the inlet tract not direct into the cylinder via the injector.
is there a way of interupting the intake on the THP to enable spraying this in there? my concern would be getting it in after an airflow meter as i'm pretty sure it wouldn't be good for one of those at all!
its some pretty funky gear, you wouldn't want to breathe it in yourself for example!
i reckon a few good squirts with this, then shut engine down for a soaking in period & a few more shots while running should help remove the deposits..
for the cost of a litre of fluid & a brake cleaner bottle i reckon its gotta be worth a try.
we have recently got a bore scope at work so next time we have a terraclean or car with a carbon buildup or even a blocked DPF i want to get some before & after images so i can see exactly how effective any of these procedures are

just for the record EVERYONE who has had a terraclean service, petrol & diesel have all reported a "drive away difference" with improved pickup, smoother idle & often increased mpg.
when we got the machine personally i was a non believer which is why i always ask people to call me back & let me know afterwards, good or bad.

and no i'm not trying to sell anybody anything, if you're interested in the procedure do some research & decide if you think it will be of benefit to you

however i don't think it would necessarily help in these circumstances

[FatS]

That's an INLET valve?!?!?
So is that petrol/air 'clagging' up on the way IN,
or exhaust coming BACK up from the combustion chamber??
(or oil from guides?)
and, whatare the sparklie bits?? I've seen carboned exhaust
valves before but only brown/black carbon not multi-coloured
gritty bits?!?!

[cyclone]

That is from all the oil vapour that comes from the PVC system. That is about what any engines valves would look like without (thanks to the direct injection) the fuel air mix passing over them to keep that crap from building up.

[FatS]

Ahh, got it now. Cheers matie :rolleyes:
(think the UK mob are still snoozing! )

[Chris_Blue]

As Cyclone said FatS, its the oil crud that is recirculated via the PCV outlet, that goes via the air intake into the engine and is supposed to be burnt off
The oil is suspended in the air with moisture, (e.g. condensation) and hits the back of the inlet valves as it passes over, and due to heat carbonises and causes what you see, over time AFAIK.
Thats the reason for a catch can, which has a gauze in it, to try catch the suspended oil. It obvs dont catch it all!
So cleaning becomes required, just a matter of when i suspect.

[Toxic]

I really think Citroen should take a leaf out of BMW's Dealerships and start offering Walnut Shell Blasting to THP engines. I cannot see how they cannot ignore this issue.

[Toxic]

Didnt Citroen offer a "Special spray" as treatement. Good if you can offer a better service Jamie

Info Rapid for hestitation: http://mybrennan.co.uk/IRs/IR_Hesitation.pdf

[Superfly Guy]

Yes, we have the tools to do the timing chain...pretty easy job

@Jamie, how much notice do you need to book both of these, plenty of time til I'm home but need to squeeze it in within a two week timeframe.

[Jamie@SPTuning]

About a week at the moment.

[Superfly Guy]

About a week at the moment.

happy days, il email you closer to the time.

[colganraz]

About a week at the moment.

Can you pm me a rough quote jamie plz