What is this noise?

10

Asked by Oct 20, 2016 at 05:55 PM about the 2005 Dodge Stratus SXT

Question type: Maintenance & Repair

Got a 2005 Dodge Stratus 2.7L. The check
engine light has been on for about a year
now with knock sensor reading. About a
month ago, the coolant air bleeder popped
off while I was driving on the highway, I
pulled over immideatly becuase I saw
smoke. After the car was towed home, I
replaced the unit myself and afterwards
added oil as I noticed it was low. When I
started the car back up, I heard a
thuddering, knocking type noise coming
from the lower side of the engine. Since
then I have driven the car seven or eight
times with no problem. I notice the noise
when the car starts, when i accelerate, and
if i have been driving it for more than a half
hour. The car also stalls a lot when I
reverse, especially when i have been
driving it for a while. Keep in mind i am not
a good mechanic at all, so I may have
messed up when replacing the air bleeder
(i follwed a youtube video). What could this
noise be?

4 Answers

93,135

Sounds like a loose rod bearing, the knock sensor may have been picking this up long before you could hear it, that's maybe why the light, nothing the computer changed would change the sound so it set the light and code, it may also be trying to retard timing, and that could cause your dying out when you change gears. If it is a rod bearing it won't last long if you continue to drive it, if your going to keep the car then fix it right away before it flys apart and ruins the engine completely.

2 of 2 people found this helpful.
Best Answer
66,205

Sounds like a bad knock sensor. If the noise is constant then, as tennisshoes said, it's probably a worn bearing. Do you have very low oil pressure at idle? Another worn bearing symptom. Since you have the code for the knock sensor I'd replace it and see if the noise goes away. If not, it's probably a bearing. HTH. -Jim

1 of 1 people found this helpful.
10

Very interesting. Yes the oil light comes on when the car is idle, also about six months ago it is as if it takes longer for the car to start (i have to turn the key more and for longer). Is this in anyway connected to the air coolant bleeder popping off? The entire top half of it just unlatched. What do you think the car is worth now at 160k miles? I assume its not worth much anymore and the repair is not worth it. Also is there a way I can test if it is the knock sensor or the loose bearing?

1 of 1 people found this helpful.
66,205

Since you're having an oil pressure problem at idle in addition to the knocking it's going to be a bearing. If the knock sensor isn't too expensive you can replace it just to be sure. But 9 times out of 10 a knock with low oil pressure at idle is a bearing. HTH. -Jim

1 of 1 people found this helpful.

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