engine thud

[VSIIBerlinaL67]

when my car is parked and i rev it, it sounds like theres a cyclinder not running and it makes a thuding note in the exhaust, it hasnt lost any power its a V6 auto

i havnt got any fault codes :hit:

i need help.... anything i need be worried about??

 

[POVRTY]

does this only happen in park? or on the move also. if it sounds like a cylinder out it would sound something like a subaru. does the engine come good after the" thuding" noise. if so find wich cylinder is droping in and out and start from the basics

 

[VSIIBerlinaL67]

it only happens when i rev in park, i dont think its doin it while its movin

 

[POVRTY]

is the engine misfiring 4 sure

 

[VSIIBerlinaL67]

i cant tell it does sound a bit like a subaru but once it gets passed around 2500 revs its ok,

 

[POVRTY]

find wich cylinder is misfiring by pulling each lead off 1 by 1, with anything that is not metal, and then refiting!.......... be carfull not 2 get shocked. when u finaly come across a cylinder-lead, when you pull the lead off it doesnt make a difference to the runningn of the engine then check the lead 4 wear marks. if its ok then swap ya plug. if you done that then grab a mate withe the same car........ and try his coil pack

 

[POVRTY]

one more question does your car get hot while sitting

 

[VSIIBerlinaL67]

ok thanks mate

 

[VSIIBerlinaL67]

yer it does it heats up pretty quick i noticed that today also

 

[POVRTY]

when the car comes back down to normal operating temp, try taking the radiator cap off while car is idling, which should'nt be a problem as the thermostat has opened and there is total circulation of of the cooling system, if the cooling system bubbles/spits at normal running temp for sufficient time then there is unidentified air getting into ur cooling system, if similar actions occur maybe head for some kind of pressure/head test at a radiator specialist.