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Discussion Starter · #1 ·
CIMG7680 - YouTube

2006 Reno. Has been making this sound on and off for 2 or 3 years now. Normally at start up until engine is warm. It will do it subsequent start up's sometimes. And sometimes it won't do it at all. At recent trips to the alignment shop and for state inspection the alignment guy said he thought it was the catalytic converter, and the inspection mechanic (who I know personally) rattled off a few things it might have been, but he couldn't say anything 100%. He guessed at oil pump, timing chain tensioner (I told him it was a belt and he ruled that out) and something else but I don't remember what it was because I think he ruled that out as well. The car runs fine and there are no warning lights/check engine light lit up on the dashboard. It can be embarrassingly loud sometimes and sounds like a diesel until it gets warm. Anyone else experience this? Any remedies or repairs? Thank you!
 

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Whoa that's pretty loud... does it increase directly with revs? Does it change if you put load on the engine, like start to drive? From the video its hard to tell if it's something rattling like a heatshield, or possibly something touching one of the pulleys/belt on the accessory drive or even inside the timing cover. It doesn't sound like internal engine noise... I see your car is manual too - does it change if you push the clutch in at all ?
 

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I can't ID the sound either, but it is scary as hell. :(
 

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Discussion Starter · #4 · (Edited)
Actually, if you pump the gas in neutral, or actually drive it, the sound goes away. So I guess you could say as rpm's increase the noise decreases to a point where when it gets warm it goes away completely. It definitely seems to be directly relative to rpm's. It doesn't change when you push in the clutch. I do my own oil changes and have checked visible heat shields and belts, as well as the alignment guy and inspection mechanic.

I saw the subscriber who had an ignition switch problem in a Vitara. The one click guy with the YouTube video? It appears some Suzi's are prone to unexplainable phenomena/paranormal activity? Lol...

Thanks for the replies, all. Any other guesses anyone?
 

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Have you been using the recommended 5W-30 oil and changing it RELIGIOUSLY? :huh:

Look inside the opened oil fill port. Is the engine internally crapped up with black gunk or is it clean and shiny in there?

I'd remove the serpentine accessory belt and run the engine BRIEFLY to see if the noise goes stops, pointing toward an accessory (not engine) problem. ;)
 

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Discussion Starter · #6 ·
Religious on the oil changes, about every 4K with the 5/30 Super Tech. No crud/build up in the valve train, all clean n' shiny. Before I go taking stuff apart I'll wait and see if anyone else cares to offer suggestions, but the accessory and serpentine belt suggestion seems like a sound one. Thanks!
 

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Have you had a look at the power steering pump? Sometimes the gears can start to go I think this might cause a noise. Also just looking at the heat shields isn't good enough. They can break free but still be held in place. You need to get under the car with a screw driver and check the connecting points of the heat shields to make sure there all intact. Let us know what you find out
 

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My 2007 Forenza manual is starting to make this same noise when the a/c is on. Did you figure out what was making this noise? Will be taken to the shop next week. Thanks for your help.
 

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I had a similar noise... just not quite so loud. I finally found it by taking a long transmission funnel. And turning it around and making a hearing tube out of it. I finally found the noise loudest at/by gasket leak at the EGR valve sub-gasket (help me out with the correct name guys). The gasket that attaches the EGR/water hose/ sensor block to the head. The underneath of the gasket is only about 3/8" wide. And it had worn or blown out underneath the assembly. A huge amount of noise was blowing/sucking? out of a small leak.
 

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Sound has been ID'ed. It was the timing belt tensioner. This is my car and an old username I forgot the creds on. I just finished a t-belt n' water pump install and the tensioner was included in the kit. No more rattle. Sounds and runs really well now. I'll do a flush n' fill in a few weeks as soon as I know the WP isn't leaking :) as it's about 90% distilled water at the moment. I don't think we'll see any sub-freezing temps for awhile and summer ain't quite here yet...
 
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