Skip the auto shop - Our mechanics make house calls

Q: Surging/bucking/wavering when accelerating between 2000 and 3000 RPM

asked by on

I own a 2002 Toyota Camry LE V6 with 158000 miles. Lately it's been having a bucking/surging problem when I accelerate between 2000 and 3000 RPM. It did the same thing about 3 years ago due to a faulty oxygen sensor. I replaced it and the car has ran great since, but now it's doing it again. According to my scan tool, all oxygen sensors seem to be functioning normally. Though last week there was a P1410 code for an EGR circuit malfunction that went away the same day. I had replaced it today, since it did look in pretty bad shape, and cleaned the throttle body entirely, plus made sure all wiring and their connections weren't broken or loose. It ran OK for about half a mile and starting bucking again upon acceleration. There are still currently no codes. Problem started with no warning about a month ago.

My car has 158000 miles.
My car has an automatic transmission.

A: Try and road test the vehicle with the EGR ...

Try and road test the vehicle with the EGR valve vacuum line disconnected and plugged. Your check engine light may come on for the valve being disconnected but you are just testing for now. If the problem goes away then you know the EGR system is causing a lean condition in the engine causing the surge. Try and clean out the EGR passages and the EGR temp sensor of carbon. Try de-carbonize the intake and throttle body then clean the injectors. This should fix the problem. If you want a qualified technician to diagnose the problem, then you can contact one through YourMechanic to do this at your home or work.

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・Save up to 30%

Get a quote

What others are asking

Q: What precautions should be followed with the power outlets?

While your car’s power outlets provide convenient ways to charge portable electronics, or even connect additional devices like DVD players and the like, they do need to be used with caution. Here are the most important Tips Never use...

Q: O2 sensors faulty after only 6,000 miles

Hello, this comes up often on this vehicle. If I knew the codes, it would help me to determine the problem. Typically, if you continue to get the same O2 sensor codes, then it is either caused by poor quality...

Q: Car not turning left or right

This is most likely a problem with the electronic steering lock. When you insert the key into the ignition slot the steering wheel should unlock, via an electric motor in the steering column. If this motor malfunctions, the wheel will...

Related articles

How Do Power Car Windows Increase Passenger Safety?
Power windows are responsible for approximately 2,000 emergency room visits every year. When a power window closes, it exerts enough force to bruise or break bones, crush fingers, or restrict an airway. Though...
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...
P2428 OBD-II Trouble Code: Exhaust Gas Temperature Too High Bank 1
P2428 code definition A P2428 trouble code signifies that the PCM has detected a problem in the exhaust gas temperature sensor circuit in bank 1, which subsequently contains the number one...