Question about 2007 Chevrolet Chevrolet Cobalt LS

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Tick in motor with a lot of blowback coming from oil cap has started making a whining noise. not the knock sensor. could it be the oil pump?

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The ticking may be coming from the valves, and or, the rocker arms, and or, the lifters. I have a 1996 Chevy Cavalier that has valve train noise and has 230,000 miles on it and is still going. If you are taking the oil cap off when the engine is running, you will see oil spitting out of it, since the engine is lubing the top end. Most vehicles have a pressure gauge on the instrument panel, and or, an oil light, which would show pressure problems. Try to isolate where the ticking is coming from by using a mechanics stethoscope, or a screw driver to your ear. The handle part of the screw driver goes to your ear of course. Place the scope or screw driver blade close to where the tick is coming from and you will hear the ticking get louder the closer you get to it.

Posted on Jul 03, 2014

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2000 Estima, 6 cylinder, makes a short whining noise on start up, also when placed into gear both forward and reverse - mainly when cold - makes a slight knocking sound that fades when you pick up speed,...


The whining noise at start up is either the power steering pump (possibly low fluid, or faulty pump bearing), or possibly a belt on the engine. As for the knocking sound, that is hard to diagnose without actually hearing it, but based on the fact that you are hearing a whining sound at start up, which is indicative of a loose belt, I would start at the belt tensioner and make sure that it is applying the correct amount of pressure on the belts. If the belt tensioner is faulty, it can make a knocking sound. If that is not the issue, then it could simply be the lifters. With engine run time/miles on the engine, internal engine components, such as lifters, valves, bearings and any moving part, deteriorate from friction wear and heat.They have a tendency to make a knocking/rattling sound when they are building up pressure. When they build sufficient pressure, or the engine reaches operating temperature, this sound/noise will dissipate and become nonexistent. This can be remedied by changing the oil, and possibly the weight of the oil (5w30, 10w40, 20w50) depending on your driving habits , or conditions (Highway v/s City/Stop&Go, or short trips under 30 miles)

I hope that you have found this information to be useful, and if I can be of any further assistance, please let me know. Thank you for using fixya!

Oct 01, 2013 | 1995 Toyota Previa

1 Answer

I notice my oil was low, cause it was running a little rough. So I put a quart in. Then it was running better. Then I drove it the next day and it started making a ticking noise and now it is getting...


the ticking , if you hear it on the top of the motor, will be a rocker arm,, it could be plugged and not getting oil, if its coming from lower down in the motor, it is possibly a stuck valve,, or a rod bearing , if its a ticking noise its more than likely the rocker assembly,, if its more of a knocking noise its lower in the motor

Sep 12, 2011 | 2005 Chevrolet Cavalier

1 Answer

I took the car for repair and they fixed my oil pan valve cover gasket and the oil pan gasket. they put the knock sensor wire direct to the knock sensor since they didnt have a connector. i drove off and...


the knock sensor changes the timing of the motor when it senses knock ,it sounds like the wire may have come off ,it sounds as if when you press the gas the timing should advance and it sounds as if its not advancing thats why you are hearing a clattering noise on accelerating.if you keep driving it like that you can do engine damage

Mar 03, 2011 | Toyota Tercel Cars & Trucks

1 Answer

Service engine soon indicator on and a buzzing/whining noise.


i recommend that you take it into auto-zone or a car shop asap. from what you have described the ticking as, it sounds like a bottom knock. as for the whine i don't know.

May 14, 2010 | 2005 Nissan Xterra

1 Answer

Engine knock hard over 2500 rpm


Does the oil light come on or the knock occur during the engine warm up after a cold start?
There could be a couple of problems causing the issue. You could have an oil pressure pump or pump pressure regulator sticking. I would have a mechanical oil pressure gauge installed and verify oil pressure at idle and 2500 rpms to make sure oil pressure is in normal ranges.
You could also have excessive piston rod bearing, crankshaft bearing or cam shaft bearing wear that will cause oil pressure to drop too low to prevent the rod knock your hearing at 2500 rpm.
You said a knock and not a ticking noise,so I don't believe a lifter is the issue at 2500 rpm.
Start with the oil pressure check and go from there.
Let me know.
Regards,

Aug 22, 2009 | 1996 Dodge Stratus

1 Answer

Engine knocks when startup but disappears after engine warms up.....could the oil pump be defective.......what about the knock sensor....


Its probably lifter noise,check what grade of oil is in the car or change it to a slightly thicker grade,i would expect that the car has a lot of mileage on it,if the oil light goes out quickly on the dash when starting its not the oil pump(very uncommon),knock sensor is for ignition timing to stop pinging,nothing to do with your noise,generally its engine wear

Apr 16, 2009 | Datsun Maxima Cars & Trucks

4 Answers

Ticking noise from engine


You might have a bad hydraulic valve lifter (assuming this engine has them)... you could try an aftermarket product designed to unstick valve lifters.... any auto parts store carries them.

Mar 04, 2009 | 1999 Daewoo Leganza

2 Answers

Loud Ticking/knocking Noise From motor; What is it?????


could be yur water pump going do you leak anti freeze or oil? also if a older model could be ot of timeing check your distributor cap and see if its loose
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Jan 21, 2009 | 1996 GMC Jimmy

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