I need help engine knocks after warm up but goes away when reaching a certain rpm
Monkey627
21 - 32 of 32 Posts
Ya they was all with in range
So, if the knocking is only after warm up, what oil do you use? For example if you use 5w-30, try 5w-40, it's not going to fix a mechanical issue, but perhaps it might make a difference. Not a Subaru, but I have an 5.7 LS1 Holden (GM) 2000 model. Oil spec is 10w-30, but it seems better with 10w-40, pretty sure it has less of a taping noise than it did running on 10w-30.
The noise in the video doesn't sound much different than my car. It could be wide valve clearances which I think is an engine out job to fix as the clearance shims are under the buckets not on top.
I run 5w-20 the engine calls for 0w-20 but the knock started after hitting a deer and I do understand that subarus are known for piston slap and engine noise my neighbor that works on subarus is also stumped on the issue
I dunno... that really sounds like rod knock to me. BUT I would take the time to probe at the timing cover with a stethoscope (or a piece of vacuum tubing or a really long screwdriver or whatever) and see if it is more prominent from there. The "goes away at X RPM" part could also be a bad timing chain tensioner since they are oil pressure-dependent. Doesn't really sound like timing chain though.......
This has been going on for almost a year now ive listened to the timing cover and all over the top and bottom on the engine bc cant pin point the location I know I took the exhaust off and just ran both cats and the knock would only be there when it was cold outside
On our MX5 (Miata) there was a noise that I thought was a failed cam advance solenoid and it turned out to be a flat on alternator v-belt. When you hit the deer did the engine come to an instantaneous stop?
No the motor was still running after I hit the deer in drove the car home
You mentioned that engine shifted on its mounts, what about the exhaust system, I'm wondering if parts of the exhaust are touching body work and engine sounds are transmitted different or exhaust brackets broken or pipes bent etc. since accident with the deer. You mentioned you're using 5w-20 oil try 5w-30 synthetic.
I have gone over the exhaust everything checks out good I know one of my cats are going bad or is bad and I currently have 5w30 in the motor now and it hasn't made a difference been running it for a few weeks now
21 - 32 of 32 Posts
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