Knocking sound

Tiny
MYLADYGLORIA
  • MEMBER
  • 2006 CHRYSLER PT CRUISER
  • 57 MILES
Knocking sound coming from. Some where on the car. By REPLACING the P0325 KNOCK SENSOR. MAKE THR NOISE GO AWAY?
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Monday, March 26th, 2012 AT 3:01 AM

31 Replies

Tiny
RASMATAZ
  • EXPERT
The knock sensor only detect engine noise it does not cause it. It sounds like you have a rod knock or valve train noise can you tell if the noise is in the upper part of the engine or the lower?
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Monday, March 26th, 2012 AT 3:05 AM
Tiny
MYLADYGLORIA
  • MEMBER
Knocking sound.. When I speed up it stops completely.. When I brake or start out slow it knocks.I believe the noise is coming from the lower part of the engine engine. Does that help?
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Monday, March 26th, 2012 AT 3:20 AM
Tiny
RASMATAZ
  • EXPERT
It sounds like you have a spun rod bearing. I would remove spark plug wires one at the time to see if you can get the noise to change.
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Monday, March 26th, 2012 AT 3:28 AM
Tiny
MYLADYGLORIA
  • MEMBER
Ok, I used to have a very quite running engine. The engine light came on so I took it in. Computer test found fault code p0340 and p0325. They replaced the p0340 but did not replace p0325. By the time I got home the engine was so loud I thought a helicopter was following me. Of course I called a shop and they said what you did, a rod knock going to cost $1800.00 to fix! Boo. Thanks for your help though I love this site
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Monday, March 26th, 2012 AT 3:41 AM
Tiny
RASMATAZ
  • EXPERT
Use 2CarPros anytime, we are here to help. Please tell a friend.

Cheers
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Monday, March 26th, 2012 AT 6:31 AM
Tiny
MYLADYGLORIA
  • MEMBER
  • 2006 CHRYSLER PT CRUISER
  • 57 MILES
Ok, I used to have a very quite running engine. The engine light came on so I took it in. Computer test found fault code p0340 and p0325. They replaced the p0340 but did not replace p0325. By the time I got home the engine was so loud I thought a helicopter was following me. Of course I called. But I was told to bring it in if the light came back on. No light just louder and louder engine noise and now the knocks?
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Friday, May 15th, 2020 AT 12:22 PM (Merged)
Tiny
ASEMASTER6371
  • EXPERT
The 340 is a cam sensor code.
The 325 is a knock sensor code which may be set from the noise. In other words, it is doing its job but the knock is still there.

You need a shop to listen to the noise and give you an idea of what the issue is.

Roy
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Friday, May 15th, 2020 AT 12:22 PM (Merged)
Tiny
MYLADYGLORIA
  • MEMBER
When I took it in and the 340 cam sensor code and
the 325 knock sensor code came up the car was not knocking at the time. The noise started after they repaced the 340. Should they have replaced the 325 since it came up also?
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Friday, May 15th, 2020 AT 12:22 PM (Merged)
Tiny
ASEMASTER6371
  • EXPERT
No, the knock sensor has nothing to do with the noise but the sensor is coding because it cannot get rid of the noise.

Roy
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Friday, May 15th, 2020 AT 12:22 PM (Merged)
Tiny
VIC21772
  • MEMBER
  • 2002 CHRYSLER PT CRUISER
  • 103,000 MILES
My 2002 Pt cruiser has a knocking coming from the engine, but it only seems to knock when idling, seems to run fine other wise. It only seems to knock when idling, seems to be fine other wise, it seems to go away when you rev it up, just knocks when idling.
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Friday, May 15th, 2020 AT 12:22 PM (Merged)
Tiny
FIXITMR
  • EXPERT
Does it matter if engine is warm or cold? Sound change at all?
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Friday, May 15th, 2020 AT 12:22 PM (Merged)
Tiny
VIC21772
  • MEMBER
Well it seems to get louder when the car warms up, it may be there when you first start it but it is hard to hear it over the fuel injection, but once it warms up it it very noticeable. And aain only seems to happen when it is idleing.
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-2
Friday, May 15th, 2020 AT 12:22 PM (Merged)
Tiny
FIXITMR
  • EXPERT
Well 2 things might account for the difference. Increased oil pressure above idle and a rotational balancing increase. Usually it's the crankshaft that exhibits this kind of behavior.
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Friday, May 15th, 2020 AT 12:22 PM (Merged)
Tiny
FIXITMR
  • EXPERT
A timing chain can also exhibit these symptoms. Hard to diagnos over net.
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Friday, May 15th, 2020 AT 12:22 PM (Merged)
Tiny
VIC21772
  • MEMBER
Hard to say, but the timing belt, and water pump were just changed about a month ago, and I just replaced the PCM about a week ago, and I just changed the sparkplugs 2 days ago, runs a heck of alot better but the knock is stil present.
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Friday, May 15th, 2020 AT 12:22 PM (Merged)
Tiny
FIXITMR
  • EXPERT
There was a TSB on 4cyl motors for cam knock. Said it was not sychronous/rhythmic but erratic tap noise.
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Friday, May 15th, 2020 AT 12:22 PM (Merged)
Tiny
CHADDWICK
  • MEMBER
  • CHRYSLER PT CRUISER
I have an 01 PT Cruiser, chrysler, 58,000 miles. That has recently starting making an irregular knocking sound. For days I will hear nothing and then at times when I am stuck in traffic for a while I will start hearing and feeling a knocking sounds. I can feel it right under my feet and it does not knock faster or slower with excelleration. It seems to be without pattern. It does not knock when I am turning the wheel or anything - just in a straight line after being in slow or stop-and-go traffice for a while.

When I speed up it slows down or stops completely. But then I may not hear it again for days.
AT first it was so irregular that I thought I was dragging something - also because I can feel it under my feet when it knocks. But I am not dragging anything.

Chadd.
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Friday, May 15th, 2020 AT 12:22 PM (Merged)
Tiny
SYNCRAIT
  • EXPERT
Do you notice it more when your braking or does it not matter. Or does it just do it most while changing speeds wether it be speeding up or slowing down. Good luck :)
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Friday, May 15th, 2020 AT 12:22 PM (Merged)
Tiny
CHADDWICK
  • MEMBER
Well to answer your questions it usually begins on slow acceleration. After I have already been driving a while. I have gone weeks without hearing it at all - until yesturday when I heard it again - but not as bad as the last 2-3 times.
I have noticed something else that may be important. I have realized that the knocking is only an issue when I am or have just used the Air Conditioner. I know nothing about cars - so I don't know if this is connected or a coincidence. But maybe that is why I only get it once in a while.

What do you think?
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Friday, May 15th, 2020 AT 12:22 PM (Merged)
Tiny
BUBBA_KOSKI
  • EXPERT
Check your knok sensor, harmonic balancer and timing chain/belt
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Friday, May 15th, 2020 AT 12:22 PM (Merged)

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