Answer
Jul 02, 2024 - 04:12 PM
Hi there,
Experiencing bucking or jerking at speeds of 60 to 65 mph in your 2000 Lexus ES300 could be due to several problems. Here are the most common reasons:
1. Ignition system problems. Possible culprits are faulty spark plugs and ignition coils causing misfires, which result in bucking.
2. Transmission issues. A faulty torque converter resulting in clutch slippage will cause bucking at higher speeds. Low or dirty transmission fluid will lead to improper shifting and cause bucking under load.
3. Fuel system issues. A clogged fuel filter can restrict fuel flow, causing the engine to hesitate or buck at higher speeds. A faulty fuel pump may not provide consistent fuel pressure, leading to engine hesitation.
4. Engine management system. A faulty mass air flow sensor will send incorrect data to the ECM/ECU, leading to improper fuel mixture and bucking. A bad oxygen sensor can cause imbalance/incorrect air-fuel mixture adjustments, resulting in engine hesitation and bucking.
I hope the information above greatly helps in your troubleshooting process.
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