Bad engine noises

Post by **Jwlman** » Mon Jan 22, 2007 12:22 am

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?

Post by **Steinberg** » Mon Jan 22, 2007 12:40 am

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?

Post by **Jwlman** » Mon Jan 22, 2007 7:16 am

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

Post by **Jwlman** » Mon Jan 22, 2007 4:07 pm

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.

Post by **Username** » Mon Jan 22, 2007 4:48 pm

when you pull the plug wire off does the ping go away? how does the spark plug look? have you checked the timing recently?