Compression testing?

[Toaster Pilot]

Borrowed a compression tester like this:



to see what's going on with my poorly 1.8T engine.

Only measured 50psi on all 4 cylinders - what am I doing wrong?! (or is it completely ducked?)

[Toaster Pilot]

Did that (although I unplugged the injectors rather than removing the fuel pump fuse) - I haven't tried dripping a bit of oil down there yet though.

[Toaster Pilot]

Pretty sure it's drive by wire, is there some way I can prop open the throttle body ?

[Toaster Pilot]

Propped it open and still 50psi in all 4

[Toaster Pilot]

It's losing coolant from wherever it decides it can leak from - opinion of the breakdown guy was that it's building excess pressure in the cooling system due to head gasket failure and venting through any slightly weak point in the 196k mile old cooling system.

Trying to verify (going to do a sniff test tomorrow if the gear arrives)

[Toaster Pilot]

It's a VAG 1.8T in an Audi A6.

Hoping the sniff tester is going to arrive this morning.

[Toaster Pilot]

I could probably go and pick up another gauge and try it - wouldn't hurt to have one in the tool box for the future.

Sniff tester didn't arrive today, hopefully be here tomorrow

[Toaster Pilot]

Notice this looks very similar http://www.amazon.co.uk/Am-Tech-Automotive-Compres...

and there's a review saying it only showed 50psi on all cylinders whereas a better tester worked properly.

[Toaster Pilot]

I'll go out and buy my own tester later - looking at either http://www.machinemart.co.uk/shop/product/details/... which I like the look of because it's got lots of adaptors for lots of different vehicles or
http://www.halfords.com/webapp/wcs/stores/servlet/...

I figure it's worth the extra £5 for the much increased flexibility.

[Toaster Pilot]

Bought the Clarke tester - 150ish across all 4 with a cold engine. More like it.

Will test again hot but the compression seems fine

[Toaster Pilot]

Evoluzione said:

Somebody must have forgotten to paint the 1 on the scale.

doogz said:

Cracked liner.