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#4478492 - 08/03/17 07:28 PM CRC GDI Intake Valve Cleaner Spray on Hyundai
JustinH Offline


Registered: 04/17/04
Posts: 5114
Loc: Texas
Car is a 2011 Sonata with 2.4L GDI engine.

It now has 45k miles and would ping badly on 87 octane, less on 89 and none on 93 octane.

I have ran various fuel system cleaners through the gas tank with no improvement.

Car gets 3750 mile oil changes with Valvoline 5w30 synpower.

I called around a few indy shops to get a price to have the GDI cleaning done. Prices ranged from $99 to $149, and none of the shops really explained what was done, or the service.

Anyways, I bought a 13 dollar bottle of CRC GDI Intake Valve cleaner from Amazon, decided to try it out. I bought the stuff because it had decent reviews, and it had a permanently affixed straw to the bottle. I was worried about blowing a plastic straw into a running engine!

Had my wife hold the throttle around 1500-2000 RPM's while I sprayed the can of cleaner into the intake.

Car sputtered a little bit but never stalled, and there was no smoke out of the tailpipe or unusual sounds.

Reading the instructions says to shut the car off after spraying in the whole bottle for one hour, and let it heat soak.

Then restart the car, and take a spirited drive.

I followed the directions exactly and never had any smoke or unusual sounds out of the engine.

So, I'm happy to report that I have burned two full tanks of Sams Club 87 octane fuel with almost no pinging at all.

Temperature has been around 100f the whole time. I can recall one time it pinged very slightly at a low speed in the past two tanks of gas. Other than that nothing.

I am not recording timing or anything with an OBD2 scanner, but I can feel the ECU is pulling timing on the 87 octane fuel, and it runs much better on 93, but I'll stick with 87 its not a Maserati.

I'll continue to dump a bottle of Techron into the fuel tank every 3750 miles, as per Hyundai recommendations, and I'll continue with the 3750 mile oil changes (severe service).

This motor is a dirty pig, but its nice to have it well sorted and running on regular fuel. Sams Club is not top tier, but it is a brand new station and they move a lot of gas.

CRC recommends to use their product every 10k miles in a GDI application. I think I might buy it once a year.

_________________________
'11 Hyundai Sonata GLS
'11 Scion XB

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#4478496 - 08/03/17 07:31 PM Re: CRC GDI Intake Valve Cleaner Spray on Hyundai [Re: JustinH]
demarpaint Offline


Registered: 07/03/05
Posts: 29390
Loc: NY
Hopefully it has a long lasting effect, and not just a few tankfuls of gas.
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#4478516 - 08/03/17 07:50 PM Re: CRC GDI Intake Valve Cleaner Spray on Hyundai [Re: JustinH]
Oil_Flunky Offline


Registered: 06/23/09
Posts: 78
Loc: Michigan
CRC GDI works well on carbon filled, short tripped, port injected engines also.
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#4478544 - 08/03/17 08:21 PM Re: CRC GDI Intake Valve Cleaner Spray on Hyundai [Re: JustinH]
walterjay Offline


Registered: 04/12/09
Posts: 204
Loc: Maryland
Good to hear. I have a Hyundai with a turbo and am thinking about using it. I am not sure if it can be injected and go through the turbo. Does anyone know?

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#4478552 - 08/03/17 08:28 PM Re: CRC GDI Intake Valve Cleaner Spray on Hyundai [Re: JustinH]
KrisZ Offline


Registered: 12/23/06
Posts: 7274
Loc: Toronto, Canada
Drive it spiritedly once a week or so and it should also help.
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2015 Dodge Grand Caravan-21k miles.
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#4478553 - 08/03/17 08:28 PM Re: CRC GDI Intake Valve Cleaner Spray on Hyundai [Re: walterjay]
rooflessVW Online   content


Registered: 12/24/11
Posts: 3663
Loc: North Carolina
Originally Posted By: walterjay
Good to hear. I have a Hyundai with a turbo and am thinking about using it. I am not sure if it can be injected and go through the turbo. Does anyone know?

I would unclamp the hose closest to the throttle body, insert the straw, and re tighten the clamp and spray from there.

You could spray through your turbo, but I think you'd only clean the turbo impeller.
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"Zed's dead baby, Zed's dead."

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#4478569 - 08/03/17 09:02 PM Re: CRC GDI Intake Valve Cleaner Spray on Hyundai [Re: JustinH]
JustinH Offline


Registered: 04/17/04
Posts: 5114
Loc: Texas
I will re-read the documentation, but I do believe it says safe for Turbos.
_________________________
'11 Hyundai Sonata GLS
'11 Scion XB

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#4478571 - 08/03/17 09:04 PM Re: CRC GDI Intake Valve Cleaner Spray on Hyundai [Re: JustinH]
Thax Offline


Registered: 11/07/10
Posts: 780
Loc: VA
Honestly this is pretty much what I do when I do a fuel induction service. I use a vac line that goes into manifold though , then clean the throttle body separately. Sounds like you have a good maintenance plan with your 2.4L, short OCI on syn is best for this and the 2.0T engine. If you are a DIY guy and dont use a dealership , I would advise to call the dealer periodically to see if your Sonata has any available updates. Hyundai/KIA regularly releases updates or "logic" improvements for various modules and systems. Some can be minor others are a huge benefit. As long as its under warranty it should not cost you a dime. Important updates are for the ECU and TCM modules which modify/improve engine performance,efficiency and transmission shift behavior.
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#4478667 - 08/03/17 11:38 PM Re: CRC GDI Intake Valve Cleaner Spray on Hyundai [Re: JustinH]
Nick1994 Offline


Registered: 02/19/13
Posts: 9823
Loc: Phoenix, AZ
I don't have any pinging driving around town. I think it does on 87 octane in the mountains though, I still don't 100% know what pinging exactly sounds like so I can't say for sure.

I need to head out of town into the mountains with some 87 octane then turn around and fill with 91 and see if it changes.
_________________________
2015 Hyundai Sonata 2.4L 76k PU 5w30 & OEM
2000 Toyota Camry 2.2L 227k M1 AFE 0w30 & Wix
1996 Jeep Cherokee 4.0L 145k M1 HM 10w40 & Fram Ultra

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#4478690 - 08/04/17 01:23 AM Re: CRC GDI Intake Valve Cleaner Spray on Hyundai [Re: JustinH]
Linctex Online   content


Registered: 12/31/16
Posts: 5702
Loc: Waco, TX
Ford and GM both make a pour-can additive designed to de-carbon and de-gunk intakes. I haven't held a can in years, but it's probably just seafoam or Berryman's B-12.

It works best when a LOT is going in QUICKLY.
So much so, that when the end of the can is near, it's supposed to *ALL* go in at once so it kills the engine (flooded) and then let sit for 1-2 hours.
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#4478842 - 08/04/17 08:40 AM Re: CRC GDI Intake Valve Cleaner Spray on Hyundai [Re: Nick1994]
JustinH Offline


Registered: 04/17/04
Posts: 5114
Loc: Texas
Originally Posted By: Nick1994
I don't have any pinging driving around town. I think it does on 87 octane in the mountains though, I still don't 100% know what pinging exactly sounds like so I can't say for sure.

I need to head out of town into the mountains with some 87 octane then turn around and fill with 91 and see if it changes.


Sounds like marbles in a can.
_________________________
'11 Hyundai Sonata GLS
'11 Scion XB

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#4478845 - 08/04/17 08:41 AM Re: CRC GDI Intake Valve Cleaner Spray on Hyundai [Re: Thax]
JustinH Offline


Registered: 04/17/04
Posts: 5114
Loc: Texas
Originally Posted By: Thax
Honestly this is pretty much what I do when I do a fuel induction service. I use a vac line that goes into manifold though , then clean the throttle body separately. Sounds like you have a good maintenance plan with your 2.4L, short OCI on syn is best for this and the 2.0T engine. If you are a DIY guy and dont use a dealership , I would advise to call the dealer periodically to see if your Sonata has any available updates. Hyundai/KIA regularly releases updates or "logic" improvements for various modules and systems. Some can be minor others are a huge benefit. As long as its under warranty it should not cost you a dime. Important updates are for the ECU and TCM modules which modify/improve engine performance,efficiency and transmission shift behavior.


I had the car in the dealer for two recall services, and asked them both times for ECU updates and they ignored me and said it was not necessary and there were none for my car.

I do not like my Hyundai dealer chain, but they are so close to my home I just take it there for recall work.

I am not under warranty, but I do have 10 year 120k mile engine warranty per Recall.
_________________________
'11 Hyundai Sonata GLS
'11 Scion XB

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#4479433 - 08/04/17 10:41 PM Re: CRC GDI Intake Valve Cleaner Spray on Hyundai [Re: Linctex]
GMBoy Offline


Registered: 11/22/04
Posts: 7682
Loc: Texas
Originally Posted By: Linctex
Ford and GM both make a pour-can additive designed to de-carbon and de-gunk intakes. I haven't held a can in years, but it's probably just seafoam or Berryman's B-12.

It works best when a LOT is going in QUICKLY.
So much so, that when the end of the can is near, it's supposed to *ALL* go in at once so it kills the engine (flooded) and then let sit for 1-2 hours.


Yes - the old GM TOP ENGINE CLEANER (old name) was very well known to be an aggressive cleaner. It is NOT seafoam or B12. Seafoam is basically so outdated and so inferior to today's cleaner I don't know why people still use it.

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#4479522 - 08/05/17 02:46 AM Re: CRC GDI Intake Valve Cleaner Spray on Hyundai [Re: JustinH]
ltslimjim Offline


Registered: 08/06/10
Posts: 5640
Loc: WatUpDoc
I use Amsoil's Power Foam since the GM or Mopar products are a smaller can. Same purpose. A good hour soak after ingesting into the intake when the engine is hot, closed hood after for heat saturation. thumbsup
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92 Civic Hatch (stolen frown RIP)
07 Honda Fit Sport (A/T) WELCOME thumbsup

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#4481589 - 08/07/17 09:04 AM Re: CRC GDI Intake Valve Cleaner Spray on Hyundai [Re: GMBoy]
steve20 Offline


Registered: 06/19/07
Posts: 3475
Loc: Morris County NJ
Originally Posted By: GMBoy
Originally Posted By: Linctex
Ford and GM both make a pour-can additive designed to de-carbon and de-gunk intakes. I haven't held a can in years, but it's probably just seafoam or Berryman's B-12.

It works best when a LOT is going in QUICKLY.
So much so, that when the end of the can is near, it's supposed to *ALL* go in at once so it kills the engine (flooded) and then let sit for 1-2 hours.


Yes - the old GM TOP ENGINE CLEANER (old name) was very well known to be an aggressive cleaner. It is NOT seafoam or B12. Seafoam is basically so outdated and so inferior to today's cleaner I don't know why people still use it.


I too, was a fan of the old GM TEC- I believe it was mostly butyl cellosolve. Worked well on every car I tried it on
Steve
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