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・Fair and transparent pricing

Get a quote

What others are asking

Q: My check engine engine light is on and the computer (ECM) said it's a crank sensor problem.

Check the crankshaft position sensor and see if there is a loose wire or if the remote wiring is disabling the sensor. If the wiring is good and the sensor is hooked up properly, then I recommend replacing the crankshaft...

Q: Speed control broken. 2005 Buick Terraza

You may be having a problem with the throttle control actuator assembly not getting a signal from the ECM, or the actuator module is defective. The cruise control test with the dealer scanner can monitor all the inputs and outputs...

Q: Replaced brake light switch but still no lights when pressing on brakes

Hi there. Check the fuses/relays and replace as necessary. If the fuse is blown and blows again we'll need to investigate what is causing the circuit to overload. If the fuse checks ok, then check for supply voltage at the...

Related articles

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...
P2103 OBD-II Trouble Code: Throttle Actuator Control Motor Circuit High
P2103 means there is a fault with the throttle actuator control motor circuit, likely due to a defective electrical component or part.