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Bad engine noises
Posted: Mon Jan 22, 2007 12:22 am
by Jwlman
Last time up bobcat my engine developed a pinging wich seems to be comming from cyliner 6. It pings when I am idleing on a hill, or if it is under load.
I have the 4.2. Maybe a messed up rod or vavle?
Any ideas?
Posted: Mon Jan 22, 2007 12:40 am
by Steinberg
pinging or tapping?
pinging is minor rpe-detonation, or knocking. tapping would be a mechanical noise from the valvetrain. the pinging generally sounds like a rattling in the exhaust.
just curious- how are you sure which cylinder it is?
Posted: Mon Jan 22, 2007 7:16 am
by Jwlman
Piney wrote:pinging or tapping?
pinging is minor rpe-detonation, or knocking. tapping would be a mechanical noise from the valvetrain. the pinging generally sounds like a rattling in the exhaust.
just curious- how are you sure which cylinder it is?
Its pinging. The tapping dosen't happen till I am on the highway lol. I just poked around under the hood for about 10 mintued and the sound seemed to be comming from the rear of the enigne so I assumed it was probably that cylinder
Posted: Mon Jan 22, 2007 4:07 pm
by Jwlman
someone suggested that it could be due to carbon built up and to try using seafoam so I guess I will do that this weekend.
Posted: Mon Jan 22, 2007 4:48 pm
by Username
when you pull the plug wire off does the ping go away? how does the spark plug look? have you checked the timing recently?