2007 Tucson Cold Start Rattle - Engine and Car Noises


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2007 Tucson Cold Start Rattle

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canicon25
New User

Jan 11, 2022, 5:09 AM

Post #1 of 5 (2044 views)

2007 Tucson Cold Start Rattle	Sign In

Hi,

My 2007 Hyundai Tucson 2.7L V6 makes a loud rattle noise on cold startup. It's only there for a couple seconds. Any suggestions what might be causing this noise. The vehicle is fairly high mileage (~225,000km) so I wouldn't be surprised if something is wearing out.

Tom Greenleaf
Ultimate Carjunky / Moderator
Tom Greenleaf profile image

Jan 11, 2022, 5:37 AM

Post #2 of 5 (2037 views)

Re: 2007 Tucson Cold Start Rattle	Sign In

? Could be normal for it's age, miles if that cold. Oil is thicker and engine bearings need oil fast upon start up is taking a second or two (count that it's a long time) suggests if you expect cold lower oil viscosity to low limits listed in owner's manual for this exact vehicle. The first # listed means thinner in lay speak the lower it is.
It's not a great sign for overall engine life left if what I think but you can extend time of good use with the oil chosen,

T

canicon25
New User

Jan 11, 2022, 6:24 AM

Post #3 of 5 (2025 views)

Re: 2007 Tucson Cold Start Rattle	Sign In

Thanks for replying. When I said cold start I just meant that it's been sitting in a heated garage overnight. When we start it up in the morning, it makes the rattle noise. I guess maybe oil is draining out of the engine and maybe it takes a second for it to pump back up?

Tom Greenleaf
Ultimate Carjunky / Moderator
Tom Greenleaf profile image

Jan 11, 2022, 6:35 AM

Post #4 of 5 (2016 views)

Re: 2007 Tucson Cold Start Rattle	Sign In

I'm guessing slow oil pressure not sure of it. YOU can tell with either a warning light or gauge on dash how fast it builds up or light goes out.

Test with KOEO (key on engine off) see the available warnings light up on dash. If somehow it doesn't work that's an issue.

Warm or not in a garage as engines wear it takes longer for oil pumps to get oil to critical parts.

OTHER! It could be an accessory that's belt driven? If so next time with a helper open hood and listen while helper starts it.

It's good that your paying attention as noises are sometimes warnings of serious problems or ones that can wait but you do need to know,

Tom

Hammer Time
Ultimate Carjunky / Moderator
Hammer Time profile image

Jan 11, 2022, 7:26 AM

Post #5 of 5 (2009 views)

Re: 2007 Tucson Cold Start Rattle	Sign In

Quote

I guess maybe oil is draining out of the engine and maybe it takes a second for it to pump back up?

That is exactly what is happening but it still indicates excessive wear in the engine. Sometimes a better oil filter will help that situation but it's not a good sign.

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