GDI engine care.

[zielritter]

I know there are manufacturers out there that have solved it. Was simply trying to state that there's a precedent for gas engines that has lead to all of the concern.

If I recall, there's a Youtube video illustrating how Hyundai's GDI system works. Doesn't it show, speculatively, a "double squirt" of fuel that actually catches the back of the valve and cleans it?

 

[NSXNEXT]

I'll need to take some. It's really not difficult to do. Just disconnect the hose that is connected to PCV valve near the throttle body, add separator to end of that hose, and then add a new hose between the separator and PCV valve.

Thinking about picking up this one.

http://www.ebay.com/itm/VMS-ALUMINU...ED-BLACK-/310500748496?_trksid=p2054897.l5664

 

[GRIFF]

Just watched a u tube video called "GDI Injection Failure" where they claim that the first GDI engines did indeed have issues with carbon build up on the intake valves.

The video further goes on to claim and depict how the later GDI engines have over-come this problem and engine inspections seems to show no carbon build-up on the intake valves.

I would suspect Hyundai is among the later.

GRIFF

 

[zielritter]

Thinking about picking up this one.

http://www.ebay.com/itm/VMS-ALUMINU...ED-BLACK-/310500748496?_trksid=p2054897.l5664

That's pretty unnecessarily expensive, imho. What I've linked below is very nearly identical to the model I have (couldn't find the same one). It's designed to fit to an air compressor hose and remove contaminates and moisture from the hose as air flows through (sound familiar?).

All that I did was remove the provided filter and add steel wool in the bottle instead. Probably could have left the filter but I didn't know how quickly it would clog up in this application. Works like a charm.

http://www.homedepot.com/p/Husky-1-4-in-Air-Compressor-Filter-HDA70403AV/100027474

I'll also add that you do have to buy the brass fittings that screw into my device so you can attach the hose. You can pick those up at the hardware store too obviously.

 

[path914]

Just watched a u tube video called "GDI Injection Failure" where they claim that the first GDI engines did indeed have issues with carbon build up on the intake valves.

The video further goes on to claim and depict how the later GDI engines have over-come this problem and engine inspections seems to show no carbon build-up on the intake valves.

I would suspect Hyundai is among the later.

GRIFF

Nope, sorry this is not the case. I have cleaned the valves on these engines (both v6 adn v8 models) and they acquire hard burnt oil residue on the intake valves just like every other GDI only engine.

I had quite a bit of experience with this issue on my last car (Mazdaspeed 6) which was significantly worse due to the added pressure of a turbocharger and poor seals on the OEM turbo. On that car, accessing the valves and cleaning took a full day and had to be done every 15k-20k miles. This is while blocking the egr and having an air/oil separator installed.

In comparison, on the Hyundai's GDI engines this takes a couple of hours max (mostly waiting for cleaning solvent to soak) and does not need to be done as often, 30k miles seems to be a good interval.

Seafoam does little to nothing to resolve the issue as has been determined by many people on several different platforms. While introducing it to the air stream under vacuum does push it past the valves, it simply does not have the "power" to affect the residue on the valves. It takes a good solvent soak and physical cleaning or abrasive blasting to even have a chance to get the stuff off.

I understand that GM has a pressurized system that forces a strong solvent through the manifold and by the valves, but this is a second-hand reference, so I cannot say for sure.

Audi and BMW has used blasted walnut shells in the past to resolve the issue, but this is always a temporary fix.

While more complicated, the only successful fix made by manufacturers so far seems to be the addition of secondary port injectors. However, this is an added expense that few have implemented.

 

[Mark_888]

While more complicated, the only successful fix made by manufacturers so far seems to be the addition of secondary port injectors. However, this is an added expense that few have implemented.

As I mentioned in my post above, Toyota/Lexus has implemented the dual injector solution (fuel injectors, and direct injectors).

 

[Gunkk]

So has anyone on this forum actually had a GDI-related problem with their GDI engine?

 

[Alwaysforward]

The engines you have worked on, what type of oil was being used? Any significant difference between regular oil vs Synthetics?

 

[path914]

As I mentioned in my post above, Toyota/Lexus has implemented the dual injector solution (fuel injectors, and direct injectors).

They would be part of the "few" that I mentioned. Not sure why this comment was needed? The Subaru/Toyota collaboration for the BRZ/FR-S is another example.

 

[path914]

The engines you have worked on, what type of oil was being used? Any significant difference between regular oil vs Synthetics?

Both regular and synthetic have been used, no difference from what I've seen or heard of from others. Either way, excess oil gets deposited on the valves and then hardened by the high temperature environment.

In relation to the question of anyone having issues related to this, few people would notice the issues as they are quite subtle for the most part. Slightly decreased efficiency and performance being the main issues until it is excessively bad (my guess would be around 100k mile range for these cars), then it can lead to more significant issues as many Audi, BMW, Mazda etc. owners have experienced.

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