Learning View Snapshots \ Discussions

[TheMightyGonzo]

PM sent about a tune.

[<GB>]

my car was logging the P0420 with a high flow cat and without a cat, that code has been turned off cause is would always come on when driving on the freeway but not much around town

[KiDo_Tuning]

my car was logging the P0420 with a high flow cat and without a cat, that code has been turned off cause is would always come on when driving on the freeway but not much around town

Correct. Number one way they come on is with the Cruise Control on as EGT's can become higher with the constant throttle correction causing excessive tip in enrichment

[BlackSTI]

13th July


23rd July


IAM is below 1... this car is starting to get frustrating.

Previously had boost issues - where once the revs hit 2K it feels like it's (the engine) hesitating and no boost/acceleration until I hit 3K revs and the boost comes in hard. There is no way that I've found to drive it smoothly, so I spend my time trying to keep it below 2K.
It has been in the garage (John French) - checking out split pipes etc - the only issue they found was the intercooler was leaking which they sealed up. About a week later the issue returned, so I got a second hand top mount off a member here and it has been running fine since then (about 3 - 4 weeks ago). Sadly yesterday the same issue returned so I decided to do a learning view to see if the IAM had dropped again.

Anyone have any ideas ?

[bigBADbenny]

Who is the tuner if any and what's the tune strategy?
Iirc the low rev range low load w/ knock scenario reflects rattling heatshields and wastegates?

[BlackSTI]

Who is the tuner if any and what's the tune strategy?
Iirc the low rev range low load w/ knock scenario reflects rattling heatshields and wastegates?

Its Matt, although I haven't heard back from him in a while.

I'll have a dig around and see if I can find anything that's rattling - thanks for the idea.

[bigBADbenny]

There's a wealth of info on this as it's seems to be fairly common.
They don't all end up like this though...
http://legacygt.com/forums/showthread.p ... 14195.html

https://www.google.com.au/search?q=low+ ... ru&spell=1

Can you post a log?
I had a specific tune revision that had a really distinct band of low load flkc between 2-2.8K rpm...
So looking at a log can help to pinpoint the source, at least by comparing to mine

[<GB>]

you sure you don't have a boost leak? it might be sucking in air when off boost so the ecu needs to add fuel then once you hit boost it needs too pull fuel out cause its escaping? have a listen under your bonnet you might hear hissing sound

[BlackSTI]

There's a wealth of info on this as it's seems to be fairly common.
They don't all end up like this though...
http://legacygt.com/forums/showthread.p ... 14195.html

https://www.google.com.au/search?q=low+ ... ru&spell=1

Can you post a log?
I had a specific tune revision that had a really distinct band of low load flkc between 2-2.8K rpm...
So looking at a log can help to pinpoint the source, at least by comparing to mine

I've attached a rom raider log of my drive home from work - there is a lot there, I am going to try and pull out some key parts later on tonight - I don't really know what I am looking for too much, still learning

My mate with basically the same car has noted that my engine seems to move around more than his - such as when starting the engine and reving - I am wondering if there is an engine mount or something that is a miss that is causing more vibration etc... and potentially causing false knocks? Stabbing in the dark here with my limited knowledge.

I've only had the head gaskets redone probably about 5000 kms ago - so hopefully nothing too sinister will appear.

you sure you don't have a boost leak? it might be sucking in air when off boost so the ecu needs to add fuel then once you hit boost it needs too pull fuel out cause its escaping? have a listen under your bonnet you might hear hissing sound

I haven't heard any hissing etc - previously the bov return pipe was cracked (now replaced) - but the garage was going over everything a month / 1.5 months ago when I was having the same issue and only found the leaking top mount. I will double check for any obvious pipes off again.

A side note in case it is important - my car does use a fair bit of oil - the mechanic thinks this is because of my turbo - he seemed to think the shaft had a fair bit of play when the had the inlet off last time checking for cracks etc.

[brainy]

What causes an A/F correction of -96.09?

[BlackSTI]

So if the knock counter is trustworthy - It looks like the knocks are only happening below 2500rmp. Dots signify the knock count going up.

Just to clarify... X Time - Y RPM - Markers are knocks

[bigBADbenny]

Log the L&R VVT angles at idle, stationary at 1500 rpm and in 4, 5 & 6th gears freeway cruise

[KiDo_Tuning]

What causes an A/F correction of -96.09?

Its a sign of ECU drop out... sound familiar?

Current train of thought is the HG fitment has possibly results in a fragile earth. Intermittently drops out on spool OR the WG flap is generating a lot of noise

[brainy]

Not familiar for me thankfully (because my issues weren't big enough). I do see something different when i log however.

Guess changing the spark plugs is his first step.
Also check the earth straps for continuity.

[bigBADbenny]

I just thought to search "What causes a "negative A/F correction" "...
Related to overboost: (tune related)
http://forums.nasioc.com/forums/showthr ... 861&page=4
Related to fuel evap purge control (vac to inlet, charcoal canisters etc)
http://forums.nasioc.com/forums/showthr ... ?t=2239597