Join Date: May 2011
Location: Rhode Island, USA
Drives 2011 Sonata SE Turbo
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I am also having gas mileage issues and am about to check my plug gap. I am familiar with another thread in which Depeche93 indicated that the correct spark plug gap per Denso is 0.032 in. However hmaservice.com lists the correct gap for the 2011 2.0t GDI engine as 0.0394-0.0433 in. I wanted to call attention to this discrepancy because if these cars are coming out of the factory at 0.028 and should be around 0.040, that could result in a significant difference in performance. Also, if folks are checking their gaps and closing them down to 0.032, that might not be the correct thing to do either. What is the consensus? Thanks.
No such TSB exists for the YF Sonata, turbo or otherwise, on the HMA service site. The last TSB to discuss spark plug types and gaps in any detail dates to 2002. Aren't the gap guide lines listed in the back of the owner's manual?
The gap range of 0.0394"-0.0433" is the same given for the 2.0T engine in the QF Optima (2011-2012) on the KiaInfoTech website. The online version of the owner's manual is of no help.
I'm certain Depeche93 was mistaken. I called the consumer affairs 800 number for Hyundai, and there is no TSB for 2.0T spark plugs. We can put that issue to bed.
Ken99, the Sonata manual does not list spark plug gaps. However, hmaservice.com provides that information.
So Rob JS, you are asking what people are doing about plug gaps. Here's my answer: nothing. My Turbo engine is running great and my MPG's are nominal. At this point, I have no reason to re-gap my spark plugs.
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