Thumping and Clunking
There is a rattling noise from the engine when you accelerate:
Your car runs well all the time. But when you press on the gas pedal to accelerate or to go up a hill, the engine rattles like the cylinders are full of marbles.
Possible causes:
The ignition timing may be set wrong: Adjust ignition timing.
The engine is overheating: Check and repair cooling system.
A vacuum line is leaking or disconnected: Reconnect vacuum line. Replace vacuum lines.
Incorrect grade of fuel: Fill with the correct, or higher, octane fuel.
There is an excessive amount of carbon built up in your engine: Clean carbon from valves and combustion chamber. (Not a DIY job)
There may be a fault in the computerized engine control system: Check engine control systems with a scan tool. Test circuits and repair or replace components as required. (Generally not a DIY job)
There is a rattling noise from the engine when you accelerate:
Your car runs well all the time. But when you press on the gas pedal to accelerate or to go up a hill, the engine rattles like the cylinders are full of marbles.
Possible causes:
The ignition timing may be set wrong: Adjust ignition timing.
The engine is overheating: Check and repair cooling system.
A vacuum line is leaking or disconnected: Reconnect vacuum line. Replace vacuum lines.
Incorrect grade of fuel: Fill with the correct, or higher, octane fuel.
There is an excessive amount of carbon built up in your engine: Clean carbon from valves and combustion chamber. (Not a DIY job)
There may be a fault in the computerized engine control system: Check engine control systems with a scan tool. Test circuits and repair or replace components as required. (Generally not a DIY job)