When I let in the clutch I hear a sort dull thump sometimes. It happens sporadicly but frequently. I hear it when the pedal is about half way out and it feels like it is emanating from the firewall behind the clutch pedal.
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Re: clutch pedal noise
Check to see there is anything loose. Put the car bumper against something and put it in first gear. Now slowly let go of the clutch. If the cars engine turns off your transmission is good. If it does not turn off or has trouble going off, then you may have a clutch , throw out , or transmission problem.
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Sounds like the clutch is adjusted so it touches a little... not good.
The sound could also be from a burned out Throw-out Bearing. From the CarTalk web site:
"TOM: The second most common type of clutch failure is when the throw-out bearing (also called the release bearing) fails. That\'s the bearing that pushes the clutch plates apart when you push in the clutch pedal to change gears."
It makes a roaring sound when you push in the clutch pedal. Silent otherwise. Its a pain to replace, as you have to get the engine and transmission separated. Sometimes you have to pull the engine, sometimes the transmission, sometimes both!
That is why that work on the master cylinder and slave cylinder are so critical, and why proper adjustment is vital.
They will probably charge a lot, but its a lot of work. If they pull the engine or transmission, may as well get a new clutch and certainly a pilot bearing, too.
Then again, you may be lucky and its just a clearance adjustment in the clutch slave cylinder.
The vehicle appears to be suffering from "Clutch Drag". This is often caused by insufficient disengagement of the clutch pack components. On the Manual transmission I would expect 1/4 to 3/8 inches of "Free Play" at the clutch pedal. The distance between the rest position, and when depressed the point of first resistance. Anything in excess of this, requires adjustment to the Pedal stroke linkage, to obtain that measurement.
If this cannot be achieved then, the only alternative is to replace the Clutch Pack and Flywheel Pilot Bearing. At the same time. As the vehicle has covered 140k miles, without positive service records, a Transmission OIl change would be in order too. Regards,David
You say you hear the noise when you "slow down". Does this mean you hear the thumping noise when you let off the gas and let the car coast to a stop or only when you are applying the brakes to decellerate?
If you only hear the noise while applying the brakes then I would assume it has something to do with your brakes. The first thing that comes to mind would be rotors that aren't true or warped which could make a thumping sound.
Do you feel any vibrations in your foot when it is applying pressure to the brake pedal? If you do feel a sort of pulsating feeling then it could very well be your brakes making the noise.
1st thing to do is run a self test of the trans for trouble codes, sounds like a problem with the electronics, may be a poor trans connector connection or a solenoid issue in the trans.
2nd if the oil pressure is low and by your description it is, don't drvie the car, you will burn out the rod bearings then a new engine is needed, yes it sounds like a oil pump issue, there is no easy pump to change, jack the engine off the motor mounts and it makes getting it out easier. Please give at least a helpful rating, we experts do this for free, just want to help folks like you with car problems.