Timing Advance

[stretch4660]

Good afternoon

My 2009 gf turbo ute seems to be getting a lot of over advanced and over retarded cam timing DTC's, just did a quick check on EOBD-II to see what the cam advance was at idle, seemed to jump between 12 to 15 degrees while idling

I then took engine revs up to a steady 1000 rpm, advance was steady around 17 degrees, as I added 250 rpm increments the cam advance seemed to be nice and linear

My question is at idle what should the normal cam advance be (I'm asking this so I know if I need to rip the rapper cover off and see if she has jumped a tooth on the cam gears)

Cheers

[barnz]

Phasor or sensor failures are pretty rare and jumped teeth are common. Id be starting at checking the chain.

Not sure whats normal at idle, I can check later

[stretch4660]

Yep she's skipped a tooth by the looks of things, pulled the tappet cover off the other day, wound it around a sh*t load of times until timing marks on the cams lined up with the chains yellow marks and hey presto both cam gears were a tooth towards the intake side when the balancer is bang on TDC.

Next question is where to go from here. Engine has done over 220,000km, is it worth sending the car somewhere, have them pull the engine and do a rebuilt for a few grand or try and find a second hand engine with lower km's and throw that in.?

[discostig]

Mine had skipped a tooth at a 200,000km valve spring change, was replaced with stock chain (and tensioner, guide and tone wheel).  Is your guide missing some of the plastic too?

Have heard skipping teeth can be provoked by letting off the throttle too fast at high revs...I have a bad habit of doing this.

Rebuild?  Mine's been fine as is for another 100,000km of 50% more power than factory.  About to bust 300,000 this coming week!  Gets flogged every day, just warmed up and cooled down, oil+filter at 7,500 (usually).

Maybe just get valve springs tested while it's in for the timing chain?

 

But hey a spare engine wouldn't hurt either hahaha.

[stretch4660]

I checked the timing guide as best I could, as I didn't have the front timing cover removed and it seemed like the guides were ok.

its a pain in the ass though because it's my ever day driver so it's hard to be without it, also living in central QLD a reputable workshop that I'd trust doing the work is over 300km away

How much $$ would I be looking at for new chain, tensioner, guides, labour, n probably valve springs.?

[bamk2f6tornado]

Where abouts in CQ are you mate?

[stretch4660]

Emerald

[bamk2f6tornado]

Your up sh*t Creek then haha. If a trip to Rocky is needed. Harley at Fatz Fab is a pretty good bloke who knows his way round a barra. He runs a GU with a self built barra in it. Couldn't recommend them enough, They do all the work to my Ute [emoji106]

[Boosting_G6E]

Wait so these barras skipping teeth are common from quick bursts of throttle etc? 

 

 

Is there anything to counter it *

[discostig]

Wouldn't say it's "common" necessarily but it's a theory I've heard from a respected mechanic/tuner on here.