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Timing Belt change & Codes
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klinkster
New User
Nov 7, 2010, 5:13 PM
Post #1 of 6
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Timing Belt change & Codes
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2004 Hyundai Santa Fe, 3.5L, 120,000 mi.
Hello all,
I have an 3.5L engine in my 04 Santa Fe. I've done a few timing belt jobs on four cylinder engines, but this is my first six cylinder belt change and it made my other timing jobs feel like an Oil change! I've always had much success using Haynes manuals for my other cars, but the Santa Fe manual I just bought is almost worthless. This manual's instructions are so vague, so little pictures, I'm actually got more info from forums on the web!!
Anywho, I have 120k on my engine. This is the second belt on the car. The first the dealer did at 60k. I've replaced the water pump, belt, tensioner pulley, and stationary pulley. I also had to replace the crankshaft gear because the crankshaft position sensor plate broke while removing the belt pulley from the crank. I had a few setbacks doing the job, but I thought all was Ok when I started the engine, but now I have a problem.......
My car drives fine at normal speeds, but when in gear and idling, it idles a bit rough. My wife drove it a day or two and now today the check engine light came on. I scanned it and got six codes. P300, P303, and P305. All engine misfire codes. My gut is telling me that I'm off by a tooth on all the cams. When I checked them doing the job, the mark on the head lined up with the cam tooth that led to the cam mark, but the tooth was on the left side of the mark. All four cams lined up on this same tooth.
Before I buttoned it all back up, I even had a local mechanic neighbor take a quick look at all the marks and he said they were all lined up properly, but maybe he was mistaken as well? I know the CRANK cam was lined up properly, I don't think you can mess that one up.
Another forum I frequent, someone stated that it sounds like bad plugs and wires. I'm still using the factory set (I will be replacing them soon), but I don't think that is the issue because the rough idle and codes began after I changed the timing belt.
My questions before tearing it down again are:
1) Does this sound like a classic tooth misalignment?
2) Could the Crank position sensor be broken? It had no physical damage, only the plate on the cog was replaced.
3) If I am off by a tooth, is it just a retarded timing, or could I have possibly done some major damage to the valvetrain? Could one tooth be a killer?
Thanks for reading!
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Hammer Time
Ultimate Carjunky
/ Moderator
Nov 7, 2010, 5:21 PM
Post #2 of 6
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Re: Timing Belt change & Codes
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Yes, it sounds like your out a tooth on at least one of the cams. It's easy to do if you don't rotate the engine a couple times to take all the slack out of the belt and see if the marks still line up.
I doubt you did any damage with a single tooth off. The damage happens when you rotate the crank with the belt off.
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We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.
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klinkster
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Nov 7, 2010, 6:48 PM
Post #3 of 6
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Re: Timing Belt change & Codes
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Thanks for the quick reply.
I'm going to work on it tomorrow and I'll let ya know ;) I don't think its just one cam, because they all line up on the same tooth on each cam. The car runs fine with normal driving speeds, its just the sluggish idle and code that indicated a problem. I'll try moving the cams counterclockwise one notch and see if its better.
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Hammer Time
Ultimate Carjunky
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Nov 7, 2010, 6:52 PM
Post #4 of 6
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Re: Timing Belt change & Codes
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Don't just experiment by arbitrarily moving the belt around. You need to line up all the marks again and look at the alignment. I realize you think everything lined up the first time but my point is that slack in the belt can effect that and you need to rotate the engine toward the tensioner to check the marks again.
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We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.
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klinkster
New User
Nov 7, 2010, 7:08 PM
Post #5 of 6
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Re: Timing Belt change & Codes
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I understand what you mean. Its not a slack problem, more a question of which side of the mark I should have positioned the cam. I hand cranked the engine at least 10 times after releasing the tensioner, and the marks all lined up at the same point as I set them, so I'm thinking its not from slack, but my wrong positioning of the cams. It was difficult to tell because the marks on the heads is a raised "I", and the mark on the cams are a painted notch between two teeth. The tight clearances make it so you can't see them when the belt is on, so I had to use my finger to feel the head mark and line it down the cam tooth. When I had the bottom mark lined up(the easy one to set) the first tooth to the left of the cam mark lined up with the head mark. All the cams were set this way. That is why I'm thinking that I need to turn the cam counterclockwise. I know going clockwise would put the head mark TWO teeth to the left of the cam mark. I hope I am clear enough in my explanation.
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Hammer Time
Ultimate Carjunky
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Nov 7, 2010, 7:14 PM
Post #6 of 6
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Re: Timing Belt change & Codes
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Sure your clear. That doesn't mean I agree with you. Your sytem hasn't worked out too well for you so far.
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We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.
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