Question about 1987 Toyota MR2

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Car has loud knocking sound. gets louder with rev of engine.

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Here's what you don't want to hear...A loud knocking noise from inside your engine is generally caused by a crank or rod bearing...when caught very early, sometimes they can be replaced. however, once the noise is loud, the attending crankshaft journal gets "hammered" out of shape and the job becomes very expensive and in most cases more costly than engine replacement. There is one other item that can cause a loud knock...your flywheel. Bearing problems generally cause low oil pressure. If you have that, it's gone...if not, have the flywheel checked before sending the engine to the scrapyard.

Posted on Jun 14, 2009

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Posted on Jan 02, 2017

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My 2000 Toyota Fourrunner made a super loud knocking sound when I was driving on the highway?


It is hard to say at this range. If a heavy knocking noise that gets louder if you rev up a bit, and it seems to keep time with the engine, you have a failed con-rod (big end) bearing, or less likely, a failed crank main bearing. A lighter knock may be a failed gudgeon pin (small end) bearing. Another possibility is that the engine has eaten a valve or 2.

A blown head gasket can make a noise but it is more like a 'chuff-chuff' sound, like a steam engine.

If the noise has nothing to do with engine revs, look for a loose road wheel or a failed axle bearing, but I doubt it is that.

If you decide it is the engine, the quickest way to investigate is to drain and remove the sump, and look at the big-end bearings. To investigate the valves you could use a borescope, before going to the trouble of removing the cylinder head.

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Engine knocking noise and oil presure keeps dropping


time to pull the sump and check for a main bearing slipper rotating in the block
the knock can also be a big end
what ever it is any knock that gets louder when it revs needs urgent ionvestigation

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Ford crown vic engine makes a knocking noise


sounds like you broke a connecting rod...drain your oil look for metal..

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I have a loud knocking sound coming from my engine. My truck still runs but the sound is getting louder. What could this be and how much would it cost to fix?


if its a top end knock its a rod ...if the knock sounds like its coming from the bottom it might be your oil pump

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I have an unnerving repeated knocking (louder than clicks) sound coming from my engine. the mechanic changes the main engine bearings but it won't go away. it goes away at high revs but very loud at lower...


I'm assuming your mechanic changed the rod bearings also. There is also a thrust bearing which keeps the crankshaft from sliding back and forth as it spins. Also check your flywheel/flex-plate, depending on whether your vehicle is auto or stick. Sometimes they crack and can cause a knocking sound.

Feb 16, 2011 | 2000 Mazda 626

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Loud knocking noise from the engine the hotter the engine gets the louder


loud knocking is usually a piston problem[wrist pin-piston-piston rings -rod bent damaged-crank -bearing ]piston hitting valve pull plugs and check for fouling it will narrow down area do compression test but knock usually doesnt last long before engine usually goes south other which u can hope for and can sound like a knock would be the exhaust gasket good luck

Jun 10, 2010 | 1993 Buick LeSabre

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Loud clanking noises


It could be a loose heat shield on the exhaust system.They can sometimes come loose and rattle like crazy while idling.

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1986 FORD 300 SIX CYLINDER ENGINE KNOCKS


Hi Bill 609!

Definitely sound like a rod insert to me. With my practiced ear, I cna tell the difference between a main bearing knock (deeper sound, more of a thudding noise), rod bearing knock (not so deep, gets louder as the engine revs, kind of a rat-tat-tat-tapping noise), and a wrist-pin knock (not quite as loud or deep and gets louder with decelerating RPM).

You can tell which cylinder the knock is on by removing the spark wires to each cylinder one at a time while the engine is still cold enough to knock. (Don't get shocked!)... when you hit the right one, the knock will noticeably quieten or possibly quit altogether!

The 300 Six is a tough old motor and I have seen them survive for years with rod knocks... Just allow the engine ample warm-up time before driving, drive on the conservative side, and keep an eye on oil level and pressure.

An oil and filter change to a higher viscosity oil with a can of STP Oil Treatment (Or something similar) is a good band-aid fix for now, I would recommend Castrol GTX 20/50w... in my opinion, Castrol is the best brand out there, I use it religiously - - - I have a customer with a Chevy Suburban who has followed my advice and adhered to good maintenance discipline that has racked up over 300,000 miles on the original small block and no consumption or engine issues, and is still running strong!

Bill, the temporary fix will work for a while, hopefully a long while --- BUT when it reaches the point that the knock doesn't go away, it is time to park it until the real repair can be done --- otherwise you risk throwing a rod and destroying your engine beyond repair!!!

Please don't hesitate to post a comment or ask if you have further questions. I hope this information answers your question and concerns and wish you well with the Ford. *** And remember to rate my assistance... Your rating is my only compensation for helping you in the free blog!!!***

Thanks!
-WildBill

Jun 27, 2008 | 2007 Ford F-150 Harley Davidson

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