MPG Increase

[2for1]

I recently had some cleaner run through my intake. 3.8 rwd 32k miles. A Wynn induction service product was used.
Sucked it all in at idle and let it set 15 minutes.
Blew it all out afterwards around the block. Mostly blue smoke. Added a can to the tank. Reset the code it threw.

Just got back from a road trip to Canada. About 1700 miles. Averaged 28 plus.
On several prior road trips of this length, I never averaged more than 25 plus.

I'll be doing this more frequently.

Idle still a little rough with the ac on.

 

[surprisinguy]

Idle still a little rough with the ac on.

Great for the MPGs... Ive used injector cleaner in the past - some varieties are more intense in cleaning that others, the chemicals are more aggressive. Maybe that's why you're still having a rough idle. What I've found through my driving years is to use a Top Tier gas that has detergents in it as much as possible. If I have to use a non-detergent gas I dont usually fill up, just buy enough to get by, then fill up at a good gas station. Gasbuddy used to list top tier gas stations but no longer does. But you can google that and find plenty.

 

[2for1]

Yes, I run Top Tier when I can. Most of this trip was with it. But that doesn't clean the back side of the valves and intake on these GDI engines. It's a common problem with these engines across all manufacturers.

 

[BlancaGenny]

I recently had some cleaner run through my intake. 3.8 rwd 32k miles. A Wynn induction service product was used.
Sucked it all in at idle and let it set 15 minutes.
Blew it all out afterwards around the block. Mostly blue smoke. Added a can to the tank. Reset the code it threw.

Just got back from a road trip to Canada. About 1700 miles. Averaged 28 plus.
On several prior road trips of this length, I never averaged more than 25 plus.

I'll be doing this more frequently.

Idle still a little rough with the ac on.

My idle is a bit more "choppy" when the A/C is on. I don't think this is an injector problem. I just had all of my injectors replaced under warranty because on a cold start, the idle was rough for about 20 seconds and then evened out after that. It never threw a code and never gave me problems. I sit for about a minute before I put it in drive so it never affected me. However, I'm a stickler so I wanted it fixed. Your A/C puts an extra load on the engine which may be what you're experiencing. I think we have the same symptom so I wouldn't worry about it unless it dies or has an extremely low idle point.

The injector Hyundai/KIA/Genesis use on these engines are terrible. They have 6 little "jets" to make the a more precise air/fuel ration. While this may have benefits, it is easier to clog them with carbon. A catch can may help but that'll be after the warranty is up, if I still have it...

 

[NC356]

How will a catch can will help with clogged injectors? Can you explain?

 

[BlancaGenny]

How will a catch can will help with clogged injectors? Can you explain?

Catch cans take away the amount of carbon produced. Carbon is what clogs the injectors, especially on these GDI motors. They don't put it in the service manual which mind-boggles me. It should be at least every 20-25k miles.

 

[1FstYota]

Catch cans take away the amount of carbon produced. Carbon is what clogs the injectors, especially on these GDI motors. They don't put it in the service manual which mind-boggles me. It should be at least every 20-25k miles.

I'm curious to see how much blow by will end up the in catch can with these motors.

 

[2for1]

Looked around the web a little to learn about catch cans.
They do a good job of reducing oily crankcase gasses entering the intake air flow.
This should help keep the intake side clean. Might be worth installing on a GDI engine.
Especially a GDI as it has no fuel in the intake system to clean it naturally.
Don't know how it would affect your warranty.
But it wont help your injectors stay clean. Clean quality fuel does that.

 

[Gen127]

Looked around the web a little to learn about catch cans.

A good suggestion. For those new to catch cans, please be aware that not everyone who has or works on GDI engines agrees with the use of or the actual practical function a catch can serves in preventing carbon build up.
The cans do seem to collect material but I have yet to see actual evidence or see controlled studies of their use reducing or mitigating carbon buildup.