Timing off — Intake Cam Retarded

Brian Owner Parma, Ohio Posted   Latest   Edited  
Case Study
Driveability
2009 Hyundai Sonata GL 2.4L (C) 5-spd
Crank / No Start

Hello everyone, the following is a rundown of how I handled this problem. I am all ears for constructive criticism and comments as I am still learning a ton about in cylinder pressure analysis.

This vehicle did not sound right when cranking. I started by checking DTC's, and there were none, the tech that was working with stated it had many codes including timing codes before they swapped pcm's but they did not record them :O(

I wanted to check for injector pulse and ignition primary and I as surprised to see the 2nd ignition event on the exhaust stroke. Is this common, or is the PCM doing this because of a timing issue? diag​.​net/file/f73b7rtlq…

Next I went I went incylinder #1 We have Low compression​. ​The first thing that I noticed that did not seem correct to me is the that the injector is being commanded on so late. Then next thing that caught my eye was the negative pressure after 360 on the intake stroke. I was assuming late intake event. This would explain the injector getting pulsed when on compression stroke. diag​.​net/file/f6oxqmjlm…

I also scoped crank and cams, however unable to locate known good cranking, the running patterns that I did locate show the crank missing tooth before the ignition event has both cams low. This vehicle never had both cams low when the missing tooth. diag​.​net/file/f4je5azmn…

We pulled the cam cover for a look and sure enough the chain was flopping and rotating the engine to TDC#1 the exhaust cam was really close if not dead on, but the intake cam was way off retarded. 

diag​.​net/file/f1s7ukhec…

The technician is going to inspect test for cylinder leakage, and take into consideration the 160k miles on the engine before selling a timing chain , guide and tensioner set. If repairs are made I will make effort to get good cam and crank signals. I have had my pressure transducer for a little over 2 months and didnt know what I was missing!

+4
Joel Diagnostician
Soquel, California
Joel Default
 

good stuff ,

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William Diagnostician
Austin, Texas
William Default
 

I would have to assume that by the timing of the second ignition event, that would be a waste spark system.

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Brian Owner
Parma, Ohio
Brian Default
 

I agree, it is a COP system though. I was thinking some kind of back up ignition strategy the pcm using because the cam timing was off. I want to catch another one of these that is running good!

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Brian Owner
Parma, Ohio
Brian Default
 

Here are some captures from a 2010 Tucson with a 2.4L that I was able to get my hands on. This engine has some upper end ticking and noises, and the used car dealer that is at states that it will set multiple timing codes after driving for a while in addition to the P0011 and p0014 that were in history. That being said I am not confident this is a good cam crank relationship, but it is good…

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Brian Owner
Parma, Ohio
Brian Default
 

youtu​.​be/QwIoqHtqBu0

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