Not really Jaguar related but.....
I have used the CRC GDI cleaner and can tell you that is does not work, at least on a Porsche V8. I had the intake off to replace the starter and noticed the intake valves are pretty well covered in a thick layer of carbon. Car has 100k on it. I did not have the CRC cleaner at the time so I put the car back together after replacing the starter, leaving the valves as they where found. About 2 weeks later I got some of the CRC cleaner and followed the directions exactly and hoped all would be ok. Another month or so later, the vacuum pump went out and in order to access it, the intake has to come off again. I checked out the valves while the intake was off and there was absolutely no difference in the appearance of the valves, at least to the naked eye. The car uses maybe one liter of oil between services (10,000 miles) Save your money and if you want clean values, walnut blasting is the only way to effectively remove the carbon.

 

I have never used CRC, but I can tell you that the full BG44 induction system cleaner does indeed work. Walnut blasting will always be more effective than chemical, but if used every two years or so the BG stuff will be a big help.

 

Can you please let me know how you verified the results from the BG system?

Thanks

 

You are not supposed to see a visual difference- If it had taken the thick layer of carbon off in one shot- you would have destroyed the engine, even 25%.
You actually proved to yourself how safe it is. And carbon is a problem.
You cannot use PEA at 100,000 miles with heavy deposit and expect it to take it penetrate just the one time it passes over the intake valves.
Its going to take months to penetrate a thick layer of carbon, but the intake valve will never be in contact with PEA for months, so many applications- its cheap enough.

This is not the application for 1 can cure- at 100k on a VW engine, with heavy buildup- expensive media blasting is the only remedy.
The VW dealerships themselves use PEA and offer it as induction service. But only for revival at 25k, 50k, but at 100k and no maintenance, you have crossed over to physical removal.

Note no Jaguar will ever have the carbon a VW engine does.

 

I dynoed the XKR before and after, specifically to verify it. (The XKR had about 30K miles on it at the time.)
The immediate gained was 30ft/lbs of torque, which is substantial in my book.

The cleaning was done at my local Ford dealership as they were an authorized BG center, for about $200.

Vince
BTW, there was zero increase in HP

 

Interesting,

Sounds to me that the Ford/Jaguar engine does indeed suffer from carbon build up contrary to QC comments

 

This has always been a point of discussion. I'm on my 3rd DI car: Audi, Lexus and XKR, so I came into this with prior experience.

Audi blamed everything they could, from oil, poor maintenance, and even American gas before finally conceding it was a real problem.
Lexus avoided the issue by placing an "extra" injector in the intake, so intake valves received a wash.

Nearly all manufacturers now offer similar cleaning to BG44 under their own brand names. I just knew of the BG44 as the preferred method from a vast Audi community I was active with.

 

As do nearly all branded gasoline companies using the same PEA. At $2 a gallon their hands are tied and only offer a small percent of what is needed.
No other chemical has had such universal adoption as PEA and proven history spanning decades. Its like we all agree PEA is essential, but the amount and delivery mechanism is the debate, some think the amount is gasoline is enough, some think the inverse.
The existence of thick carbon on valves kinda disproves those who think gas is enough.

 

With GDI, how does the PEA get to the right parts of the intake valves?

 

Indeed.
Not sure if BK uses PEA, but as was said, I can walk into almost any name brand dealership, and find that this process is now a part of their "tool set".

It should be noted that fuel additives offer little except to clean the injectors and maybe a tad off the piston dome. Today's quality gas can do the same.

The BK system uses both an in-tank additive, along with a chemical feed into the intake itself. This feed is what attacks the carbon at the intake valves directly.

 

Through the air intake. (and to a much lesser degree through the same path the carbon takes)

However the thing to bear in mind is action and reaction being equal. You cannot simply undo 10 years of accumulation in 15 minutes of spraying.
You can undo a year's accumulation in 15 minutes. Basically one has to give PEA the same opportunity given to carbon.

It does prevent further accumulation too, again when used regularly.

 

From BK "BG 44K contains a very high level of PEA"
https://bgprod.co.uk/products/fuel-and-air-intake/bg44k