Hi all,
I have replaced spark plugs recently for my Sonata 99.
I bought NGK spark plugs at Napa, confirming Napa's database. But the part number does not match exactly to the HMA web site recommendation.
After the replacement, it seems that the engine is little bit louder now. Is this normal?
What can make the engine louder?
A disturbed throttle cable adjustment?
Out of heat range spark plugs?
Or, the computer being turned off, it forgot my driving style and need time to adjust?
Do I have to do additional things other than just replacing spark plugs, such as cleaning throttle body?
Thanks, Jae.