1997 pontiac sunfire 2.4L.dual overhead cam 4cyEngine started making knocking noise while driving on highway. The hotter the motor got , the louder the knock got and the less the motor continued to run. When the motor is cool it starts right up but still has the knocking sound. The oil and antifreeze are clean and are not milky looking.
Sound like low oil pressure.check engine oil level when engine cool.oil level should be at the full mark on oil dip stick.if oil level okay replace oil filter and oil.if engine still knocks check oil pressure.make sure engine not over heating.because engine run too hot will also knock before locking up.
you could have drop a lifter on yours my sunfire did that last night got loud this morning i took it to my mechanic they started her right up and the noise was still I had a new oil pump put in so it's not that so your lifter or lifter dropped
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Sounds like a tapping maybe lifter. Maybe valve check under valve cover.
SOURCE: knock in engine
Will831,
Check your timing belt too, it might be loose already. My car had the same problem and thougt that engine was going bad on me. Tried also the additives but didn't help. So I did a litle invistagation to figure out where the knoking sound is comming from. It sounded near where the belts are. Opened the cover and voela! found the belt was loose - took it out - upon invistegation, belt was starting to wear out out - one of the teeth was starting to peel off. Replaced it, retightend it and replaced the belt tensioner too - so far it's been 4month now and still no knocking problem.
Hope this helps..
--Ed
SOURCE: Loud ticking noise from motor
are you sitting down.........has someone been doing burn outs in the parking lot? sounds like a spun bearing. drop the oil pan a inspect all rod and main bearings.
SOURCE: 4.3 vortec engine , engine noise, knocking or
The knocking or ticking is going to determine if it is in the top end, lifters, push-rod or rocker arm issue or the bottom end that would include pistons or bearings.
If it is a ticking noise, it will more than likely be a valve train issue.
If a knocking noise, piston or crankshaft related problem.
Attached is a web site that you can listen to a piston slap which is a known issue for your 4.3.
Listen to the noise and see if it sounds similar to your problem. A piston slap will generally sound as though it is coming from the central area of the engine.
Listen to the recording and let me know.
Regards,
SOURCE: 2004 Nissan Quest - Engine chatter/knocking
Ther e is a chance your injectors are leakin g down and there is excess fuel in the cylinders. Not a good thing. So, you fuel pressure and injectors need chkg. good luck
SOURCE: i have a 1999 chevy malibu with knocking noise ina 3.1l v6 motor.
try replacing harmonic balancer ,thats what made my motor knock
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