Tephra, how's that knock going? Any sounds of it since you swapped out the HFC?

 

no knock.

BUT
1) I havn't done conclusive testing for fear of blowing something
2) I have changed the tune significantly
3) I have had a service ie oil change...
4) I am working on a MIVEC theory which may be the root cause, and coupled with #3 might be a significant discovery

 

Interesting, Tephra. Do share if it all adds up!

 

ok so the theory is that under some conditions (ie old oil maybe) the mivec cams can't keep up.

particularly the exhaust cam since during spool it changes quite a lot.. and if its lagging behind means that the exhaust cam will be retarded too much on peak boost (for a short period of time)

P0011 and P0014 are meant to pop when the cams are out of range from their target, BUT it requires 5 seconds detection period... much longer than is useful.

its only a theory, but does make sense..

 

Did a lot of testing today, the actual was around 1-3 degrees slower than target when going wot but while crusing it was pretty much spot on.

This is great, thanx mrfred & tephra

 

I have a better formula for you:

(4096-x)*0.01953125

should be a bit more accurate...

 

yes - my initial WOT log, looks like the exhaust cam never reaches the target.

now this maybe because the target map is based off a different load to what I am logging, but that would be a bit strange.. because its out by about 40 load points...

 

What MUTIII values for the GSR 52680020 do we log for MIVEC timing?

Use the same formula/?

 

mrfred posted USDM memory addresses last page...

SiC posted the formula last page...

my formula above is a bit easier on the brain and a little bit more accurate

 

So you think oil viscosity effects MIVEC timing?

I.e. a 5w-30 eventually breaks down to a 5w-20. So running something like 0w-40 might be better?

 

don't know yet...

I probably should log target rather than using the map as a reference point

 

Thanks missed it earlier.

 

Sorry, just saw this for the first time. Only read up to page two.

The cylinders you listed in order from left to right I am assuming. So the low compression is in #3 actually. The last two cars we took apart had damage/low compression on #3 and seems to be a pattern to that cylinder.

I'd change the fuel pump relay for sure.

How many miles are on the car now?

If you need something let me know.

 

OK, skipped to this last page.

Oil pressure effects the MIVEC timing for sure, absolutely. Low oil pressure can also make a HELL OF A LOT OF NOISE in the MIVEC cam gears.

 

Thanx, I'll use that and also tell Hamish to add it to the next Evoscan release