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Engine GDI valve carbon build up
- Thread starter Alby
- Start date
Is this actually a measured observation? Do you actually manage to balance fuel price difference with better fuel econmy in the end?I suspect so, in any event I always use the better petrol, V-Power, Tesco 99 or the Costco premium, although it is more expensive it certainly gives better performance AND You use less, so in real terms it doesn't cost more, We are what We eat! Cars are no different, be it fuel,oil or screenwash, buy the best!
Just FYI, VW has switched to a twin-injection lately
The new Volkswagen Polo GTI's special technical features include an electronic valve-lift system on the inlet side, a dual injection system with TSI and manifold injectors (combined direct and manifold injection), three-part oil scraper rings, an engine controller with four core processors and a Miller combustion cycle.
I had not heard of this with VW. It seems big enough a problem that manufacturers have to do something. I am glad they are starting to address it.
Hi guys has anyone tried seafoam or crc intake cleaner? If so is there a vacuum hose i should spray it in?
If your catch can is then plumbed back into the intake (i.e the catch can traps and contains oil vapour) then I don't see it being an issue. It's more or less just having a filter between the crank case and the intake.
Our cars have 2 separate cyrcles to catch the oil. I installed mine between PCV valve and intake manifold (99% of vapours are coming from there). I havent installed another can between intake tube and rocker cover because there is no oil inside of that hose so far. Please do not connect catch can from PCV valve to the intake tube because system is not designed to work like this.
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Maybe... my MKv GTI (2006) was 98 in the manual and stated would run 95 albeit with reduced power output, that was from VW and explicitly stated in the manual
This is a VAG TFSI engine after 114.500 km.
Another one at 185.000 km:
There are several companies offering various cleaning methods, walnut sandblasting being one of the more popular (and effective) ones. Searched a bit today and the prices are about 300-800 EUR (DE), where as valve replacement costs as much as 1000 EUR (DE), depending where it is being done.
Check engine light, extended startup times, sluggy throttle, increased fuel consumption and rough idling are some signs that the valves need to be replaced or cleaned.
Very nice video having it done on a beemer:
Another one at 185.000 km:
There are several companies offering various cleaning methods, walnut sandblasting being one of the more popular (and effective) ones. Searched a bit today and the prices are about 300-800 EUR (DE), where as valve replacement costs as much as 1000 EUR (DE), depending where it is being done.
Check engine light, extended startup times, sluggy throttle, increased fuel consumption and rough idling are some signs that the valves need to be replaced or cleaned.
Very nice video having it done on a beemer:
Glad you posted this @Maverick. I was just looking through new posts and had not seen this thread before. Wow, have I learned alot today?! Thanks everyone, knew very little about this topic until now...
Due to fuel being injected within the cylinder, fuel type has a miniscule effect on carbon deposits, particularly on the back of the intake valves.
A true heated (via coolant) air/oil separator that returns oil to the system would be best, followed by a water/alcohol injection system, then dual catch cans (since they require routine maintenance).
A true heated (via coolant) air/oil separator that returns oil to the system would be best, followed by a water/alcohol injection system, then dual catch cans (since they require routine maintenance).
My question is because the N is programmed to pop/backfire by retarding fuel ignition, do you think this would make the N even more susceptible to carbon build up ?
If fuel is being sent directly up the valves which is hardly even combusted would this add even further to the carbon build up ?
Or could you even argue that the unburnt fuel would cover the valves and actually prevent carbon build up ?
If fuel is being sent directly up the valves which is hardly even combusted would this add even further to the carbon build up ?
Or could you even argue that the unburnt fuel would cover the valves and actually prevent carbon build up ?
I can't wait to see the responses you get from this.
I'm sure it will attract a lot of arm chair mechanics
hopefully a professional mechanic/engine builder could shed some insight.I'm curious on how retarding fuel timing to the point of backfires could affect the build up of carbon on the valve stems.
I guess we will see when some members on here reach 100000km's in their N and crack open their engines.
Isn't the carbon issue with the inlet valves? The unburnt fuel is exiting through the exhaust valves. The inlets still don't get washed by fuel.
Correct - you are on right way
The ALS system (backfiring due to retarding ign timing when throttle is closed) has no effect on the intake side of things. The intake valves are closed during the time it is active, would not help or harm carbon build-up. It does put a bit more stress on your exhaust valves, turbine wheel and catalytic converter/exhaust system but that's a separate issue.
About extending the warranty, was at my dealer again today (to replace the windshield, yay...) and they told me that once the 5 year warranty period comes to an end you can let them inspect the car and offer extended warranty. How long for or if it's even from Hyundai themselves I don't know.