Skip the auto shop - Our mechanics make house calls

Q: Engine knock

asked by on

I have an engine knock and I have guesses on what it is but not sure. Prior to this knock my engine battery and died then on my next start up it was good until I came to a stop light then my car started rattling and reving at low 500 rpm and from my recelection it stalled. Now I have this loud rattle when I start the car I do have a video on this knock for better understanding. It's at https://youtu.be/ljvSWo3eKa8 . I either think alternator gone out but my buddy's say maybe it's a cracked intake manifold, spark plugs bad (but wouldn't that make a popping noise misfire), rod knock, rod bearing spun, or the engine is no longer good

Thank you for your time !

My car has 180000 miles.
My car has an automatic transmission.

Based on the sound heard in your video, I believe you have damaged some of the valve train parts. If this happened during the engine dying, it is very possible that something has broken on the inside of the engine. I would recommend enlisting the assistance of a qualified technician to determine if the engine can be rebuilt or if it requires replacement. If the engine requires an overhaul or replacement, I would strongly recommend having this done professionally to make sure the job is done properly and will last many miles down the road.

Was this answer helpful?

Need advice from certified mechanic? Get help now!

Over 1000 mechanics are ready to answer your question.
The statements expressed above are only for informational purposes and should be independently verified. Please see our terms of service for more details

Get an instant quote for your car

Our certified mechanics come to you ・Backed by 12-month, 12,000-mile guarantee・Fair and transparent pricing

Get a quote

What others are asking

Q: On a 2001 Chevy Cavalier 2.4 L DOHC do you have tocompletely remove the timing chain cover to remove valve cover?

The cover (or "housing") is not removed. You merely disconnect the timing chain housing at the camshaft housing, but do not remove it from the vehicle. There are specific torque values required on all the fasteners so be sure to...

Q: Fuel pump relay issue. 2000 Buick LeSabre

Hi there - the first rule of modifications is that when things stop working, you revert to the condition before the last change. In this case, remove power to the new stereo components, recheck your fuel fuses and the pump...

Q: Knocking sound in the engine

A knocking sound in the engine generally means that the bearings in the engine are worn. When the bearings are worn, this allows the parts of the engine to have excess movement, causing the knocking noise. I would ask for...

Related articles

P0052 OBD-II Trouble Code: HO2S Heater Control Circuit High (Bank 2 Sensor 1)
P0052 code definition HO2S Heater Control Circuit High (Bank 2 Sensor 1) What the...
P0240 OBD-II Trouble Code: Turbocharger Boost Sensor B Circuit Range/Performance
P0240 code definition Turbocharger Boost Sensor B Circuit Range/Performance What the P0240 code means P0240 is an OBD-II generic code triggered when the Engine Control Module (ECM) detects the intake boost...
How Much Does a Mechanic Make in Vermont?
Automotive technician jobs in Vermont have an average mechanic salary of $37k, with some mechanics earning a salary of $53k.