GDI questions (concerns)

[tyler]

Im not 100% sure if this is the right forum for this or not, sorry if it isnt

I recently traded in my tucson as its at 215,000km stuff is starting to go on it. So i traded it for a new Elantra gt gls. Which uses direct fuel injection.
I did hear that carbon deposits form on the intake valves due to fuel not being there.
Which worries me as i haven’t seen, or found any solutions yet.
The car is still brand new so theres nothing wrong with it, but after break in i want to have something to do for that.
Does anyone have experience with this? should i be worried? as its concerning.

I’ve included a example photo of what i mean.

Attachments:

• Carbon-Buildup.jpg

Topic

[dan]

Carbon deposites wouldn’t necissarily form on intake valves because of a lack of fuel, carbon build up happens more commonly because of carbon build up because fuel is not being burned properly and sort of gathers on the valves as a soot.

Carbon build up is more likely to happen if your engine is running rich, without fuel you cannot have carbon build up because carbon build up is essentially a result of somewhat incomplete burned fuel.

[Rob]

Im thinking the are the values in your head is that correct…. now that could be a sticking or dirty valve arould the stopper part causeing the problem with getting carbin in it… I would do a compression test and check it out… also could be a sign of a crack or a bad part in the head

[Greg]

I have been to both Ford an GM gdi classes and in both classes the instructors have said that using low quality fuels are the largest contributors to carbon build up. They recommend top tier fuels be used in their engines to avoid this problem.

[Mike]

I don’t think it’s an automatic across-the-board recommendation or condemnation for GDI technology.

For example, looking at Ford’s engine specification page for the 2016 Focus, regular fuel is recommended for the 160 hp version of the 2.0 GDI engine. 91 octane fuel is recommended for the 252 hp version of the same engine, which actually has a lower compression ratio than the milder engine. Ford doesn’t seem to think that GDI engines require premium fuel in all cases.

Simply run your Hyundai on whatever fuel is recommended.

[Greg]

[quote=”Evil-i” post=172151]I don’t think it’s an automatic across-the-board recommendation or condemnation for GDI technology.

For example, looking at Ford’s engine specification page for the 2016 Focus, regular fuel is recommended for the 160 hp version of the 2.0 GDI engine. 91 octane fuel is recommended for the 252 hp version of the same engine, which actually has a lower compression ratio than the milder engine. Ford doesn’t seem to think that GDI engines require premium fuel in all cases.

Simply run your Hyundai on whatever fuel is recommended.[/quote]

The instructors were not concerned with octane level or grades of fuel at the pump they were talking about fuel quality in general like using Exon, Shell etc over the discont brands found at convience stores or discont retailers

For more information on top tier fuels check out http://www.toptiergas.com

[Mike]

You’ve answered your own question.

Stay away from poor quality gasoline and sketchy retailers. That advice is just as true today as it was in the 60s.

[Author]

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