Question about 2005 Hyundai Elantra
Sounds like it's either a coil pack or an injector to me, try switching the number four coil pack with any of the other coil packs if the miss follows the coil pack you need to replace that coil pack. if not it's either a fuel injector or a mechanical problem inside the motor, I would rent noid lights from a local auto parts store and look for injector pulse in the cylinder with a misfire, if the noid light is flashing it may be better to leave it to a professional as it is likely internal engine damage. hope that helps. chris
Posted on Feb 15, 2014
Testimonial: "Thanks Chris, I just took it down to auto zone to see if it was the spark plug wires, the looked fine...... but the guy said it could be internal too. he said it could be the coils...... but I don't know how to change them, i'm not much of a car buff"
Blocked exhaust system causing pressure to build up
Posted on Apr 11, 2015
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Posted on Jan 02, 2017
You are correct. The plugs are accessed below these coils. Disconnect the coil connectors and remove the 4 10mm bolts which hold the coils in place -- then you'll have access to the plugs. Here's a pic
By the way, how many miles on this 2007 Sonata? You know the powertrain is under warranty (1st owner 100,000 miles). If you're having problems, have Hyundai dealership diagnose it and fix it under warranty.
Posted on May 30, 2009
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