Loud Knock in Engine but no check engine light is on.

Tiny
KDZEE
  • MEMBER
  • 2002 SUZUKI AERIO
  • 10,400 MILES
I just bought this car to do a engine swap with a 2008 SX4 donor car I have. I found the head to be different, with the cam position sensors. This is a 2002 Suzuki Aerio 2.0L engine. No smoke or check engine light is on. Could this be a cam position sensor problem? The car runs fine, just knocks.
Friday, May 17th, 2013 AT 10:14 AM

10 Replies

Tiny
HMAC300
  • MECHANIC
  • 48,601 POSTS
If there is aloud knock try to seeif it comes form a certain area. Short out pluge wires by disconnecting them one at a time and see if knock goes away if it does then it's cylinder and it may be a rod bearing knock. Or if at top pull a valve cover and look for a cam follower/camshaft problem.
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Friday, May 17th, 2013 AT 10:17 AM
Tiny
KDZEE
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I did pull each plug wire being a old school mechanic, and the knock never went away before reading your post. I will pull the valve cover and see what I find. I think the noise is coming from the top. The guy I bought the car from brother is a Subaru Tech and said it was a rod knock. Maybe I will get lucky on this car. Thanks, Kdzee
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Friday, May 17th, 2013 AT 10:50 AM
Tiny
HMAC300
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If it's a rod knock it will drop oil pressure at idle or be low
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Friday, May 17th, 2013 AT 10:51 AM
Tiny
KDZEE
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No drop in oil pressure. I pulled the valve covers on both engines and the chain is real super loose on the 2002 Aerio and tight on the SX4. With 104,000 miles it's probably time to change the chain. Luckily their was no damage to the gears or the chain came loose. Now is this tensioner adjustable?
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Friday, May 17th, 2013 AT 2:06 PM
Tiny
HMAC300
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Doesn't look like it as it says to move intake cam backwardsto relieve pressure. Besides if you get a chain kit a new one should be with it.
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Friday, May 17th, 2013 AT 3:08 PM
Tiny
KDZEE
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Thanks, I will get a timing chain kit and change everything.
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Saturday, May 18th, 2013 AT 5:46 PM
Tiny
KDZEE
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  • 28 POSTS
I have the timing cover off.I will inspect tomorrow.
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Sunday, May 19th, 2013 AT 11:24 PM
Tiny
KDZEE
  • MEMBER
  • 28 POSTS
I am replying to this old post. Car is still sitting because I have been working on the road. Yes the oil pressure drops at idle and also the knock changes when I pull one of the plug wires off. When I did this test before it was at idle, now I pulled the plug wires off at around 2,000 rpm's
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Friday, January 9th, 2015 AT 3:25 PM
Tiny
HMAC300
  • MECHANIC
  • 48,601 POSTS
If oil pressure drops and knock changes when plug wire is pulled then it's probably an internal problem like a rod bearing/main or maybe piston. If you pull oil pan and see one of the rods blue or a lot of side play in it that is the one to pull the cap off of as it's probably destroyed or well on it's way. If crank isn't hurt like still very smooth you might get away with just a bearing but normally that isn't the case.
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Friday, January 9th, 2015 AT 4:42 PM
Tiny
KDZEE
  • MEMBER
  • 28 POSTS
I will drop the oil pan to see what I have. I have another bad 2.0L engine with a upper end problem, if lucky the crank and rods are good. I believe a valve hit a piston on that one. This was a old post, and want to get this Aerio running for the new year, 2015. Thanks for your help, I'm motivated.
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Friday, January 9th, 2015 AT 6:51 PM

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