Regarding intake valve desposits with DI..

[EricJRoy]

EGR gunk is probably the culpright if DI engines do indeed still have this EVIL technology. I hate what EGR systems to the intake tracts of our vehicles. There has to be a better way.
The back of the valve heads should be mirror polished (not swirl polished)from the factory on DI engines that do not get the fuel spray wash.

Every new direction has its compromise

 

[UG_Passat]

Originally Posted By: EricJRoy
EGR gunk is probably the culpright if DI engines do indeed still have this EVIL technology. I hate what EGR systems to the intake tracts of our vehicles. There has to be a better way.
The back of the valve heads should be mirror polished (not swirl polished)from the factory on DI engines that do not get the fuel spray wash.

Every new direction has its compromise


the VW/Audi 2.0T does not have EGR.

 

[zoomzoom]

they do it is accomplished via intake exhaust valve overlap so gunk still ends up on intake valves and no fuel to wash it off.

 

[Audi Junkie]

I cringe when I see cotton K&N air filters in these apps.

 

[MCompact]

Originally Posted By: EricJRoy
EGR gunk is probably the culprit if DI engines do indeed still have this EVIL technology. I hate what EGR systems to the intake tracts of our vehicles. There has to be a better way.


My 71,000 mile MS3 recently required a new EGR valve- at the cost of $700. I'm pretty sure that the blown RR shock isn't DI related, but with this heap I'm not 100% certain...

 

[shpankey]

I cleaned my egr and egr pipe, map sensor, maf and air filter all at the same time around the time I noticed the power loss. The egr wasn't as bad as I thought it would be but it did need cleaning. I doubt it would shock anyone though as it was a pretty easy job cleaning it. I hoped at the time to get some power back but it didn't really do much. So I did a seafoaming and that helped for a couple hundred miles but went right back to where it was. I'm sure the intake valve deposits are from a combination of PCV and EGR, but I'd bet more of it comes from the PCV.

 

[Boomer]

Passat, read my post more casrefully before responding.

 

[UG_Passat]

Originally Posted By: Boomer
Passat, read my post more casrefully before responding.


if you're looking for a pre-ignition treatment.... Toyota already has the answer with the D4-S. Does not require any special additives to make it work

 

[unDummy]

Toyota's latest D4-S twin injection fuel system combines direct injection with traditional port injection. Using direct injection and port injection simultaneously facilitates more precise mixing of air and fuel under low and medium load conditions for greater efficiency, while high load conditions dictate the use of direct injection alone for maximum power.

I foresee Toyota's future sales rebounding!!

I wonder if its patented.

Steam from distilled-water injection will keep any engine clean. Add alcohol for colder climates as needed.

Boomer, they definitely need a "DI intake fluid". Might want to trademark "intake fluid". I wonder if E85 would work?

If for some reason a DI'd vehicle ends up in my driveway, I'll just give it water injection and call it a day. Not sure what the big fuss is. Aquamist, AEM, SnowPerformance, Coolingmist, AIS, RSR..... might just get a bump in sales as more owners become aware. And, there's always the Marvel or Ampco inverse oilers.

 

[UG_Passat]

People have tried water/methanol injection on VW 2.0TFSI engines.... doesn't do squat for deposits

 

[shpankey]

Really? Does it not flow over the intake valves? I have a water-meth kit but haven't installed it as I'm still debating. So this doesn't help prevent or clean intake valve deposits at all?

 

[dparm]

I really suggest you browse some of the Audi RS4 discussions on Audizine or Euroaddiction. They've been working on this issue for a long time with (and sometimes without) Audi's help. There are cases of motors losing 20-30% of their power because of buildup.

 

[Rickey]

Anyone notice the absence of reported of IVD problems with GM's DI?

Rickey.

 

[unDummy]

Absence??? Give GM a few years.

When something doesn't do squat, one must wonder about the quality of the DIY installation.

 

[shpankey]

Originally Posted By: dparm
I really suggest you browse some of the Audi RS4 discussions on Audizine or Euroaddiction. They've been working on this issue for a long time with (and sometimes without) Audi's help. There are cases of motors losing 20-30% of their power because of buildup.

That is about right where I'd say my car is on power loss. It's hard to explain to people because your car is still pretty fast but if you know your car well you can tell. BIGTIME. I'd say I lost maybe 25 to 30% of the power it had when I first got it. It's obvious to me because there are simple telltale things it used to be able to do that it can't do at all anymore. My car is closing in on 30k miles now and I know from looking at pictures of other direct injected cars that the intake valves are gooked all up and have resulted in the considerable power loss. It sucks because there isn't much you can do about it other than pay to have a shop remove the intake and have them manually clean them professionally, but then in another 20k you will be right back again.

 

[Rickey]

Originally Posted By: unDummy
Absence??? Give GM a few years.

When something doesn't do squat, one must wonder about the quality of the DIY installation.



I'm sorry if I misunderstand, and I'm not looking for an argument, however:

1. I disagree with the first part of your reply... Maybe a few decades??? If you can speculate then so can I!

2. I am left wondering how the second part of your statement is applicable to the discussion at hand.

Rickey.

 

[BigJohn]

20-30k miles???? Is that how often we should expect the buildup to negatively impact performance?

 

[dparm]

The RS4 guys were seeing a noticeable change in 10k. A lot of used RS4s for sale had obviously never been cleaned and looked horrendous by just 30k -- probably down 80hp or more (from the original 420).

 

[shpankey]

I started noticing it in mine around 12 to 15k miles. But I Seafoam before every oil change and had a OCC on for awhile, so maybe this delayed it a few k's. At 27k miles the difference is very substantial and extremely disappointing and frustrating! Over this last 10k miles it's become more and more and more noticeable to the point where it is now. The car feels extremely flat and neutered by comparison to the first 10k miles.

 

[dparm]

Pull the IM and have it professionally cleaned.