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#4473818 - 07/29/17 10:52 AM Is this conn rod knock?
berniedd Offline


Registered: 03/24/08
Posts: 593
Loc: A Warm place to live in
2007 I4 cyl 2.0 liter Kia Sportage automatic with 53,000 miles. Noticed a few weeks ago some metallic knocking sounds from the engine when accelerating slowly. Sounds like marbles dropping onto a metal plate. Happens only when accelerating from rest or 5mph till 20 mph. (or maybe it's still there but I don't hear it bec road and engine noise drown it out) Never happens when I take my foot off the gas pedal. It is worst when the aircon is on and car's going up a ramp at 1st gear and gets louder if I speed up slowly while going up said ramp. The manual calls for 87 octane gas and that's what I use. I filled up a few days ago with 91 octane but knock seems unchanged. Other than that, car runs fine and no check engine light. What do you think, guys?

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#4473819 - 07/29/17 10:56 AM Re: Is this conn rod knock? [Re: berniedd]
Danno Offline


Registered: 10/07/12
Posts: 2021
Loc: Northern Ontario, Canada
Same noise at idle? If no, could be a bad engine mount.


Edited by Danno (07/29/17 10:58 AM)
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#4473833 - 07/29/17 11:21 AM Re: Is this conn rod knock? [Re: berniedd]
berniedd Offline


Registered: 03/24/08
Posts: 593
Loc: A Warm place to live in
Nope, no noise at idle.

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#4473842 - 07/29/17 11:34 AM Re: Is this conn rod knock? [Re: berniedd]
rooflessVW Offline


Registered: 12/24/11
Posts: 4310
Loc: North Carolina
Marbles in the pan is pinging. Try some premium and see if it goes away.
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#4473861 - 07/29/17 12:17 PM Re: Is this conn rod knock? [Re: berniedd]
spk2000 Offline


Registered: 02/19/13
Posts: 998
Loc: Prospect, KY
Take a phone video with sound and post.
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#4473884 - 07/29/17 12:46 PM Re: Is this conn rod knock? [Re: berniedd]
bubbatime Offline


Registered: 03/18/08
Posts: 5722
Loc: South Florida
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#4473926 - 07/29/17 02:06 PM Re: Is this conn rod knock? [Re: berniedd]
mehullica Offline


Registered: 08/19/09
Posts: 564
Loc: Modesto,CA
Does it make noise in park at idle or off idle? You could disable one ignition coil or fuel injector at a time by disconnecting the electrical connector & listen for the knock to disappear. Then you'll know what cylinder is bad if the knock goes away.

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#4473929 - 07/29/17 02:09 PM Re: Is this conn rod knock? [Re: berniedd]
turtlevette Offline


Registered: 12/24/13
Posts: 3649
Loc: Massachusetts
Knock under load is a main bearing. Its probably something else with only 53k miles. Do you have an oil pressure gauge?
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#4473964 - 07/29/17 02:55 PM Re: Is this conn rod knock? [Re: berniedd]
bullwinkle Offline


Registered: 10/09/04
Posts: 7721
Loc: Cincinnati, OH, USA
When I've had bad rod bearings, usually when you rev it up to 2500-3000 RPM and hold it at steady RPM with the throttle is when it gets the loudest. Otherwise it'll take dropping the oil pan & bearing caps to verify what the problem is. Or put in 20W50 & drive it until one comes out the side of the block & then put in another engine.
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#4474078 - 07/29/17 06:30 PM Re: Is this conn rod knock? [Re: berniedd]
kc8adu Offline


Registered: 08/02/05
Posts: 896
Loc: dayton oh
bunch of bad engines recalled.
get it checked asap.

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#4474113 - 07/29/17 07:51 PM Re: Is this conn rod knock? [Re: berniedd]
DdDd Offline


Registered: 06/08/17
Posts: 191
Loc: NY
Korean car. Transmissions and engines have been known to let go long before 100k miles. 10yr warranty winds up being a joke.

When they were half the price of a Toyota I could see the point. Their cars are now costing more than an American model!

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#4474584 - 07/30/17 11:11 AM Re: Is this conn rod knock? [Re: berniedd]
berniedd Offline


Registered: 03/24/08
Posts: 593
Loc: A Warm place to live in
Thanks for the comments, guys. I've already tried the filling up with 91 octane gas when my tank was half full, will try premium gas at next fill up. It is hard to record the sounds because there is no knock when engine is at idle or revved up if in the parking lot. It happens when the aircon is on and I'm gently accelerating up a ramp in first or second gear (auto transmission) or accelerating from 5 mph to 20 mph on level road. I don't know if the knock is there beyond 20 mph because of road noise and of course the engine is louder.

@bubbatime
Fortunately, my knock noise is not the rod knock you posted.

@turtle
No, I don't have a mechanical oil pressure gauge. Just the dumb oil pressure warning light. Once the engine starts, it never lights up.

I discovered something today. I'd parked the car on the street behind the condo. Tried to record the knock with my iPhone on the dash by starting the cold engine and going up the condo ramp to my parking slot on the second floor. It always knocked before when doing that as I'm coming home from work. But there's no knock today with the engine cold. So it seems there's knock only when the engine has warmed up. That's encouraging to me. Roofless, you may be right. And it may be pinging only once the engine's hot. Let's see if it goes away with next gas up with premium.

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#4492755 - 08/19/17 11:42 AM Re: Is this conn rod knock? [Re: berniedd]
berniedd Offline


Registered: 03/24/08
Posts: 593
Loc: A Warm place to live in
Update: I filled up 2 weeks ago with premium when the tank was down to half, and the knock is largely gone. Still happens but very very rarely but now softer sound quality and still only when under load with the A/C on. So I guess it's the gas quality. I've been patronizing only one gas station for the last 3 years and I changed to another station this time.

I'll be soon trying water injection into the air intake through an atomizer and see if it's also carbon deposits in the combustion chambers.

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#4493176 - 08/19/17 08:02 PM Re: Is this conn rod knock? [Re: berniedd]
pezzy669 Offline


Registered: 03/27/04
Posts: 222
Loc: Atlanta, GA
Originally Posted By: berniedd
Update: I filled up 2 weeks ago with premium when the tank was down to half, and the knock is largely gone. Still happens but very very rarely but now softer sound quality and still only when under load with the A/C on. So I guess it's the gas quality. I've been patronizing only one gas station for the last 3 years and I changed to another station this time.

I'll be soon trying water injection into the air intake through an atomizer and see if it's also carbon deposits in the combustion chambers.


Yeah sounds like spark knock, you probably have been putting gas in that did not have enough detergents to avoid deposits. The deposits create hot spots in the engine and effectively increase the compression of the engine leading to spark knock, stick to top tier gas moving forward and maybe try a fuel system and combustion chamber cleaner (Redline fuel system cleaner is a good one that goes a long way). Good thing you caught it when you did as spark knock can grenade an engine.
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#4493198 - 08/19/17 08:18 PM Re: Is this conn rod knock? [Re: berniedd]
Merkava_4 Offline


Registered: 01/30/07
Posts: 17501
Loc: Clovis, CA
That's not connecting rod knock; that's spark knock.

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