Skip the auto shop - Our mechanics make house calls

Q: is there any way possible a clogged untake before air filter or a bad pcv can ever lead to rod damage in the engine

asked by on

Drove car to store. Came back out and engine wouldn't turn over. Was a bad starter. Replaced starter and no luck. Removed #1 spark plug and burped the engine,some kind of vapor lock? Engine turned over and rod was immediately knocking. With full new oil change and oil filter. Took car to Toyota and they said rod was wrapped around crank shaft and engine is shot. I'm real confused of how a rod gets so damaged from engine not running then total knock upon restarting.there was no knock or engine problem before stopping at store. How is any of this possible? It doesn't make sense

My car has 130000 miles.
My car has an automatic transmission.

A: Hello. I have seen similar things happen wi...

Hello. I have seen similar things happen with this engine before. Typically it has nothing to do with the PCV valve though. Majority of the time it was because a rod bearing was failing. Once the vehicle was turned off, it spun the bearing and then the noise occurred. The most common reason that I have come across for this issue is a failing catalytic converter. This can cause excessive pressure and even debris to back up into the engine which can cause it to lock and bend a rod. This can be an expensive repair. If you needed a second opinion, consider YourMechanic, as a certified mechanic can come to your home or office to diagnose the knocking you're experiencing with the vehicle.

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

Ask a Mechanic
(100% Free)

Have a car question? Get free advice from our top-rated mechanics.

Ask A Mechanic
Over 10,000 questions answered!

Get an instant quote for your car

Our certified mechanics come to you ・Backed by 12-month, 12,000-mile guarantee・Save up to 30%

Get a quote

What others are asking

Q: My car idles too low and sometimes shuts off

This is a common sign of a failing idle air control valve. The idle air control valve reads the air intake as it is mixed with fuel prior to being injected into the engine. This valve is controlled by the...

Q: I changed my own brakes but now i have to press the brake pedal harder for it to brake.

Hi there. It sounds like there is something binding. How did you press the caliper pistons back into the calipers? The piston can shift and become stuck and will not operate properly. Were the brake pads hard to get into...

Q: Loud grinding and stuck feeling at front tire on driver's side

Hello. There are a few things that this can be. Most of the time it is due to a failing front bearing. When a bearing fails this noise will occur. I typically get the vehicle in the air and spin...

Related articles

What Causes Hoses to Leak?
While the largest part of your engine is mechanical, hydraulics plays a significant role. You’ll find fluids at work in a number of different areas. Your car's fluids include: Engine oil Transmission...
How Long Does a Heater Control Valve Last?
Keeping the right amount of coolant in a car is essential in keeping the engine at the right temperature. Failing to have the right amount of coolant or even bad elements...
How to Avoid Back Pain in a Car
If you have back problems, sitting in a car for an extended period of time can be excruciating. Even without back problems, you could experience discomfort and soreness from...