Skip the auto shop - Our mechanics make house calls

Q: Car starts up fine after 15 mins it starts pinging/ticking very loud

asked by on

Hello ive been working on a friends car for the past 2 weeks it all started with an o2 sensor (driver side) getting replaced the cel light didnt go off and the pinging started it has never done that since my friend owned the car over 3 years now. I told him to go to autozone to get it checked out again and to look for more codes. He came back and told me that the car started misfiring and same code for o2. We changed the spark plugs, and the other side of the o2(passenger). Then the cel went off we were glad that was over but the pinging hasnt gone away. He changed one side of the camshaft sensor (drivers side) with an is350 part and it didnt ping as he says i wasnt there but he had to put the sensor back in his sisters car so we went and got a cam position sensor. pinging Still hasnt gone away told him dont recommend driving the car but he has places to go has no choice he comes back to tell me the car sounds rough and drives rough i need advice feels like im at fault. What do i do

My car has 155000 miles.
My car has an automatic transmission.

A: Hello there, pinging can become a serious e...

Hello there, pinging can become a serious engine problem with your 2007 Lexus GS350. You have done well so far in diagnosing this problem, but the root cause still remains.

If the sensors have been replaced than the issue is with the engine itself not the sensors. The most likely causes for engine pinging are a lean condition, excess carbon buildup, vacuum leaks, exhaust leaks, ignition timing advanced, or an overheating engine.

At this point the best bet would be to have the vehicle diagnosed professionally before any more parts are replaced. A qualified technician such as one from YourMechanic will be able to diagnose the rough running and pinging issues and make any repairs required.

Until the problem is resolved the vehicle should not be driven, as it can become damaged by the pinging, also called pre detonation.

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 truck has a knocking noise from a bad lifter

A bad lifter will not make a knocking noise. It will make a tapping noise. I would recommend having a qualified mechanic listen to the noise to see if it is a lifter noise, a piston rod, or main bearing...

Q: Battery light on

Hello. If you continue to have a low voltage issue with the new alternator then there may be a circuit issue. Most of the time, if the alternator is good, it is the battery cables or there is an issue...

Q: Oil pressure dropping

I hate to be the bearer of bad news, but it sounds like your engine is at about the end of its useful life. If a motor seizes, the piston has become so hot and expanded that its stuck in...

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...
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 P0052 code means This code is seen when the Engine Control Module (ECM) tries to control the...
Rules of the Road For Iowa Drivers
Driving on the roads requires knowledge of the rules, many of which are based on common sense and courtesy. However, even though you know the rules in...