So, here’s the deal. I purchased a 2015 Kia Sportage with the GDI engine (non-turbo). I did some research and primarily found that as long as you use Top Tier fuel (which I always do) this will eliminate the carbon build-up. I also had KIA run their fuel additive through my system to clean up any ca…

Last time we had this discussion somebody had a link to a Ford (I think) engineer’s comment that they solved the problem through some design tweaks. So it seems like some cars might be less liable to have the problem. I don’t know if Kia is one of those. But these days it’ll be very hard to avoid…

I’m at 61,500 miles in my GDI Mazda 6 without any issues.

@Mike That blow-by ends up going through the PCV system and into the intake manifold. So if you drive “vigorously” and as your engine wears you will have more and more blow-by depositing stuff in the intake system. I agree that periodic cleaning is recommended, since the purging action of gasoline …

“I’ve yet to see any study that shows that Top Tier helps direct injection engines stay cleaner.” Shell claims that their “nitrogen-enriched” gas has the ability to keep GDI engines clean. It’s probably just advertising hype, but…

I have 62,000 miles on my Hyundai GDI engine (with turbo) and have had no engine issues. I do use primarily top-tier gasoline but do not use fuel additives or cleaners. I haven’t heard of any problems related to carbon build-up in these engines.

I’m sorry for my ignorance (I’m not a gear head), but will keeping the RPM’s up say when merging onto the highway help with the carbon build-up or would I be better keeping them lower in the long run? Most of my driving is a 45 minute highway commute, so I am definitely getting up to temp which is …

Just drive the vehicle like a normal person and find something important to worry about. If this is really something you lose sleep over just trade when the warranty is up.

I don’t think it’s going to matter. Get the revs up when you need to go faster, and keep them low when you’re just cruising, just like people do anyway. This is kind of one of those “we didn’t used to have to do this, but it’s going to become routine maintenance” things. Kinda like “we didn’t used…

I guess in summary these engines are still too new and the empirical data too sparse to really know. Toyota uses an interesting setup in the heads used on the Toyota FRS/Madza BRZ joint project. They use both port and direct injection together, the ECU controlling the bias depending on the engine de…

GDI engines - yes or no?

Maintenance/Repairs

texases July 11, 2016, 9:42pm 9

There’s are Ford and GM youtubes showing how gas flows by the intake valves when they’re open on their GDI engines. So more detergents can make a difference, it seems.

Topic		Replies	Views
GDI Engine Question Maintenance/Repairs	50	10975	April 26, 2016
What is GDI General Discussion	15	3355	May 21, 2016
GDI causing carbon buildup Maintenance/Repairs	21	10873	February 2, 2015
2017 Hyundai Tucson - Top Tier gas? Maintenance/Repairs hyundai	32	5493	May 30, 2019
Avoiding carbon buildup on intake valves (2015 Mazda Mazda6) Maintenance/Repairs mazda , mazda6	10	13349	October 30, 2019

GDI engines - yes or no?

Related topics