Compression test was done - 100 percent. Three of the 4 pencil coils have been replaced. Car was at Hyundai on computer couldn`t find anything. This problem is ongoing for almost 3 months. Please help!
The main thing to check is to verify the operation of the VCT solenoid. You're looking for a sticking or stuck VCt solenoid valve caused by contamination. Refer to vehicle specific repair manual to perform component tests for the VCT unit. Notes: Dealer techs have advanced tools and the ability to follow detailed troubleshooting steps, including the ability to test components using a scan tool.
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have the camshaft timing rechecked. If there are no fault codes then the problem has to be mechanical. valve timing, hydraulic followers etc. It is strange that thee is no code for the MAF/VAFnot plugged in
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