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Old 09-13-2010, 11:48 AM   #1
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2.3L just started knocking..Please HELP!

My 2005 Focus St started knocking today. It starts knocking right at 2300rpm, it's not really loud but audible enough to hear from inside the car.
I checked the oil and it was a little low so I added 1 quart and it got it right in the middle of min and max, but the motor is still knocking.
Other than the knock the motor appears to be fine, it still revs freely, no CEL, and doesn't appear to have lost any horsepower. It's a 2.3L with 97,000 miles on it.
What do you think is wrong with it??


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Old 09-13-2010, 01:31 PM   #2
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Anybody??
I did the cheap mechanic stethoscope, by putting a long screwdriver at different spots on the top of the motor. All the cylinders sound the same from the top and the knock isn't audible from the top.
That leads me to believe it's coming from the bottom end, but I can't verify.
Do you think it's the rod bearing, or could it still be a valve or spring? or maybe something a little cheaper and easier to fix?
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Old 09-13-2010, 04:21 PM   #3
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Posted via FF MobileYou were a quart and a half low on oil, and I hate to think how long since the last change for it to get that low..... Most likely rod knock and major repair time, let it run this way for long and it`s new engine time.... You Decide.....
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Old 09-13-2010, 04:24 PM   #4
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Sounds like a rod.
A friend of mine has a Mazda 3 with the 2.3L, and your description and rpm where the knock is most prominent are right in line with his symptoms.

I hope that's not your problem, but I'd look into it sooner rather than later.
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Old 09-13-2010, 09:25 PM   #5
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Bad news gets worst...I lifted it up, took off the oil filter, and cut it open. It was full of metal shavings. I left it on the lift and will be borrowing someone's car. Tomorrow or Wednesday I'll drop the oil pan and see how far the rabbit hole goes.

Thanks to those who replied.
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Old 09-13-2010, 10:04 PM   #6
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Has anyone dropped the oil pan, Is there a gasket or do you just use RTV?
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Old 09-14-2010, 11:21 AM   #7
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Quote:
Originally Posted by slamnpoke View Post
Bad news gets worst...I lifted it up, took off the oil filter, and cut it open. It was full of metal shavings. I left it on the lift and will be borrowing someone's car. Tomorrow or Wednesday I'll drop the oil pan and see how far the rabbit hole goes.

Thanks to those who replied.
Are you sure those shavings are not from the oil filter when you cut it open?
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Old 09-14-2010, 11:28 AM   #8
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Quote:
Originally Posted by slamnpoke View Post
Has anyone dropped the oil pan, Is there a gasket or do you just use RTV?
Yes, it uses RTV - It's the Ford/Motorcraft "gray" silicone. about $18 a tube.

If you end up trying to fix this and need a good con-rod, I have some used D23 parts in good shape. (Might even have a crank?)

PM me if needed. I can sell to you very cheap, ready to drop in a box and ship whenever.....
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Old 09-14-2010, 11:43 AM   #9
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Posted via FF Mobile^^^^^ get in touch with tb1999 when you know the damage, he`s been doing a lot of engine & chassis experimenting... Good cheap parts are a godsend when you have trouble...
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Old 09-14-2010, 08:43 PM   #10
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Thanks for the help, I didn't have time to get to it today, but will tomorrow and I'll see how bad it is.
Some of the shavings might have been from cutting the filter open, but there were shavings on the inside and outside of each pleat, there was just too much for it to have all come from cutting it open. I have a magnetic drain plug on the oil pan so when i drop the pan I'll know for sure.


I wish this would have happened at more of an opportune time (when I had money) and I could have made this a rebuild N/A Beast thread. Oh well, right now it's a pick up the pieces thread.
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