2003 BP5a legacy AVCS issue!

[gazzy2000]

hi

Mate has a 2003 leggy that is having issues idling, very ruff.

initial Compression tests stated that the right hand side was low 90PSI, but during that test there was a click clack.. and the compression came up to a good 190PSI, then the compression test on the left hand side stated 80 and 90PSI and never shifted.

motor was pulled, exhaust valves on left hand side looked to be burnt, the right h/s were fine.

the AVCS oil filter/gause on the right hand was crushed... sort of folded over... that has been replaced...

the left hand side AVCS gause looked to be OK

put all back together and its still has idlling better (prolly due to valves being done) but not really fixed.

real time data showed the left hand side at 53degrees advanced and right hand was 2 degrees advanced, after fitting a new pulley on the left hand side the problem then shifted sides?? i.e. the right was 53 advanced etc

question is... has anyone come accoss this type of idling problem before?

there is no oil in any of the AVCS sensor plugs as per the known AVCS issues

[Wiretap]

I had this issue on my H6. Pulled all the filters out and it went away.

[gazzy2000]

update:

well as per threads all over the interwebz on this problem, the give away was a crushed filter/gause.

All too comon (so i have read) when you find a crushed gause... there will be plastic bits that break up and get wedged in the AVCS solenoids which jams them creating all sorts of issues fromsimple bad idling through to poor performance throughout the rev range.

thats it! biff the filters, pull off the AVCS pipes & solenoids, look for the little bits of plastic from the gause then clean them out/remove them