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Discussion Starter · #1 · (Edited)
Knocking...rattling....noise.....at cold startup.....help!!!!

2005 EX-L w RES


We started hearing a loud rattling or knocking noise coming from the bottom of the engine bay area immediately after starting up the car. The noise slowly fades away as the car warms up. It is the loudest immediately after starting up the car and then the noise goes away after 3~4 minutes of leaving the car running. I can't tell if the noise is coming from the engine or exhaust.

This problem started during on our road trip. We were driving back and forth to Las Vegas from L.A. and Grand Canyon. We started hearing the noise one morning and has never stopped. Once the noise goes away we don't hear anything until the next morning we start the car again. When driving the car we don't feel or hear anything strange. It only happens for just a few minutes after starting the car cold. Any idea? Do you think the noise is coming from the engine or exhaust system?
 

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Hard to diagnose through the internet but if it is a knocking sound (as opposed to a rattle) it's unlikely to be the exhaust.

Sounds like you need a trip to the dealer.
 

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Always check the BASIC stuff first:

1. Open the hood and check all fluids. Maybe the engine oil level is low???

2. Check for any obvious loose parts.

3. Then best is to drive the van up a wood ramp (I posted info on wood ramps in the Engine Oil DIY thread), and check the undercarriage.

My guess is some loose (or broken) engine mounts?
 

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cnn said:
Always check the BASIC stuff first:

1. Open the hood and check all fluids. Maybe the engine oil level is low???

2. Check for any obvious loose parts.

3. Then best is to drive the van up a wood ramp (I posted info on wood ramps in the Engine Oil DIY thread), and check the undercarriage.

My guess is some loose (or broken) engine mounts?
My guess would be a lower bearing. If the noise goes away when the vehicle warms up, I wouldn't think it would be a mount. I'd also start by checking the oil, but if you have an engine knock, there will be engine damage. Even if the oil level is OK, you could have a bad oil pump that doesn't work properly when the oil is cold. Good luck and let us know what the dealer says.
 

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Jena,

Any resolution to the problem? Im having the same issue with my 2007. The rattling it pretty significant and my issue is exactly as you described. It sound like it is in the engine bay near the pulleys.
 

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Thank you CNN and New Dad. This rattling is giving me stress that it can be a internal engine issue. I hope I did not make a bad decision.

The TSB shows for my Odyssey 2007 EXL below.

From VIN 5FNRL3...7B000001
thru 5FNRL3...7B007592

From VIN 5FNRL3...7B400001
thru 5FNRL3...7B405900

My VIN 5FNRL3863B441660...it appears not to be in their list for this TSB. However, Im still going to look at that heatshield this weekend if loose and see if I can validate torque. I will also inspect all the engine mounts for torque, cracks and wear and tear. Im thinking more heat shield though. I will pump super and add gas additive just for grins. The problem goes away when the engine is warmed up and I do not hear it under light acceleration and it does not squeal. I can hear it on the passenger side under the pulleys. Not sure if this is the location of the heat shield. Im not that familiar with this engine..yet.

Thanks CNN for the TSB and NewDad for the engine mount suggestion.
 

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Build yourself a set of wood ramps (qty=2) using 2x10 lumber.
Use wood screws to screw the pieces together.
This will allow you to drive the van up and down for quick inspection.

Go to Home Depot and they will cut the lumber to lengths you want.
The cost is about $10-15 for the lumber needed to build both ramps (I have had these wood ramps now for 15 years).

You see the pics of the wood ramps here in the DIY Oil Change that I wrote a while ago:

http://www.odyclub.com/forums/14-pe...ssey-engine-oil-change-made-sweet-simple.html

If you need the exact measurement of the wood (3 layers + the "stopper" at the end), then here it is:

 

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http://www.odyclub.com/forums/52-20...help-me-troubleshoot-rattling-engine-bay.html

Does it sound like the noise in the above video clip? Mine makes the same noise - 2006 EX-L with about 92,000 miles and the noise is completley gone when things warm up. I changed the serpentine accessory belt, and it did not help. Power steering reservoir is new and have recently replaced the rear motor mount that was shot.

All things are pointing to the hydraulic tensioner for the timing belt. We are close to the 100K mile mark and might have the timing belt changed before Christmas (along with the tensioner and water pump).
 

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Anybody have any resolution on this issue? 07EXL here and I discovered this on my wife's car last night. Started it up, noticed a weird rattling - after I drove off it went away and did not reoccur when we made stops and restarted the engine after it sat for a while. Driveability is completely unaffected. Recently I did a tranny drain and fill - hat tip to cnn for the wood ramps idea, I like it a lot.
 

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I have the same problem on my ody 05 Touring, after changing timming belt, water pump and serpentine... Start little by little on cold start... After 2 or 3 minutes its gone! Any solution?
 

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Bought my wife a 2007 odyssey with 90k miles. She has put 5k miles on it. About two weeks ago it started knocking. It never goes away. It speeds up with the rpms of the motor. I pulled the serp belt off and crunck the van without the belt to eliminate the alt, ac, idler pully... ect. It still makes the noise. So i pulled timing belt covers and mashed down on the belt, it is tight. Any ideas? It is a loud knock, like a lil man is inside motor with a ball ping hammer!
 

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Paintslinger, I did a video write up similar to CNN. My problem was fixed by the timing belt tensioner. Search my postings. It clearly shows that my problem was the tensioner before it was replaced. I havent had the noise come back since.
 

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Well, looks like I have this problem too. Not really in a mood to DIY it, but the problem is that I suspect that the labor is not cheap, probably almost as much as replacing a timing belt. So, can you guys tell me what's involved in doing this? I've done a ton of these kinds of jobs on other cars. So, here are my questions:

1) Does anything need to be removed other than the accessory belt and the timing cover?
2) How complicated is swapping out just the tensioner?
3) I suspect that there's no way to get everything put back together without also rechecking the timing marks? I'm thinking if I zip tie the belts to the sprockets and mark them, all should be well once I swap out the one component, no?
3) How much time should I plan for this job?

This really sucks because I had the timing belt done just around 27K ago.
 
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