1.8t suddenly making loud tapping noise

No not yet, taking the sump off is my next step. I honestly thought it was a lifter at fault by the noise, but it would seem not. Does sound to light of a tap/knock to be a big end imo.

 

You got any further with yours mate? I've just done a compression check on mine and all is ok with that (145-165psi across all 4) also did the screw driver down the spark plug hole and all 4 measured the same so no bent conrods. So I'm thinking big ends now. Sump off is the next step for me hopefully in the next couple of weeks.

 

http://pages.ebay.com/link/?nav=item.view&alt=web&id=120912417545

Buy something like this, incredibly easy to pin point noises, I wouldn't be without mine or the electronic one

 

Good call, just purchased one for less than 10 so will give it a go and see if I can pin point the noise down a little bit more before removing the sump.

 

yep found the source!



a bent rod in cylinder 2.. the cylinder that had 120psi. I had checked for bent rods by looking up into the base of the engine but it was hard to tell. the engine is completely apart now, going to rebuild everything and make something strong and reliable.

I think the bend came from torque spikes from inconsistent fueling due to the map/O2 wiring.. I've heard rods normally go at much higher constant torque but the jerky running must have sent a torque spike too large for the rod to handle..

hope this helps with finding your problem too!

 

yep found the source!



a bent rod in cylinder 2.. the cylinder that had 120psi. I had checked for bent rods by looking up into the base of the engine but it was hard to tell. the engine is completely apart now, going to rebuild everything and make something strong and reliable.

I think the bend came from torque spikes from inconsistent fueling due to the map/O2 wiring.. I've heard rods normally go at much higher constant torque but the jerky running must have sent a torque spike too large for the rod to handle..

hope this helps with finding your problem too!

 

Oh great!