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With Coasting I presume the sound is coming from the engine yes?
If that is the case then the engine may be out of timing.
this is easily adjusted but i would still only recommend having this fixed by a qualified mechanic.
more details on the timing:
Every engine is carefully timed.
the knocking may be created by the piston hitting the closing or opening inlet/outlet valves on the way back up.
this can cause severe damage to the engine as the valves could potentially bore through the piston resulting in possible damage to the piston walls as it slowly starts grinding its way through the engine walls.
you may want to have this seen to.
What else can I help you with?
What would be causing a knocking sound in your muffler?
A hole in the muffler would cause a knocking sound in your muffler. A loose exhaust pipe can also cause a knocking noise.
What would make a knocking sound in a 1987 Nissan 5 speed transmission?
A seized gear can cause a knocking sound on a 1987 Nissan 5 speed transmission. A blown gasket can also cause this sound.
What would cause a loud knocking sound and scratching sound in the 3.1L chev Lumina motor?
it was meeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeee
What would cause a knocking sound at the rear of the van when driving?
the cause of this is probably a bad u joint
What would cause a knocking sound when not stepping on the gas?
can you elaborate? engine noise? stationary/moving? ticking, tapping or a definite knocking?
What would cause a knocking sound when you let off the gas?
change fuel pump
What would cause a knocking sound when you turn left while you are driving?
check CV joints
What would cause a knocking sound in a motorcycle on cold days?
low oil and a loose piston skirt
What causes a knocking sound when the brakes are applied?
Most common cause would be a loose brake caliper mounting bolts.
What would cause a knocking rattling sound from right front tire on a 2000 Dodge Intrepid?
Worn Ball Joint
What would cause a knocking sound under the hood only when the air conditioner is running?
sounds like you ac compressor is about to crap out.
What would cause a knocking sound in a 1992 Cavalier while its running?
it might be a bent piton rod if you or water or somthing into the engine
