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[Darth Loo-knee]

Sounds very much like a MAF reading high Josh.

At cold when on enrichment then its better, as it warms up and goes off enrichment it gets worse.

As said, I have seen a few that read high and live data would confirm this

Thank you Mark, I certainly appreciate your imput in this...I know when everyone's out of ideas...they all ring you up to ask you what you think 
I'll get a live data read on the MAF. I think a code reader is going to be the next thing I'll need to invest in.

Put a wanted add in the Wanted Section Josh then try it.. 

[JamesV6CDX]

I would check the main engine 0V connection (but dont hold out much hope)

This is one of the first things I tried

With a jump lead between the -VE terminal and the engine, the problem did seem to go away for the first time ever, and was fine.

However, the problem later returned with said jump lead still in place.

Still reckon it's wiring (somewhere)  :-/

[Marks DTM Calib]

I would check the main engine 0V connection (but dont hold out much hope)

This is one of the first things I tried

With a jump lead between the -VE terminal and the engine, the problem did seem to go away for the first time ever, and was fine.

However, the problem later returned with said jump lead still in place.

Still reckon it's wiring (somewhere)  :-/

Nah, If it was there would be fault codes.....the only remote possible is the coil pos supply....and thats a real rank outsider.

[joshwyatt]

According to the TC website the 2.6 and 3.2 MAF is the same, whether it be auto or manual. So, firstly I'll see if anyone local with a V6 DBW engine minds me borrowing their MAF for a few minutes, I imagine if a good MAF is used it should rid the fault, or will it only make it a bit better? I may be totally mistaken, but remember reading something about either the MAF or something else having to learn for a bit before the MAF will work properly?
MAF is £133 on TC so think it would be prudent to try one first to see if that makes any difference then buy one.

[TheBoy]

MDTM - WRT MAF, when I saw it, it was responding fine, approx 15kg at idle, up to 40kg when revved.  Obviously, thats what the ECU thought it was reading - not to say its not talking rubbish, just the figures looked plausible.

Additionally, when I saw it, it was defo only 1/3/5 missfire.  No evidence to suggest 2/4/6 missfire then...  ....so something has changed.

Its absolutely fine on warm up fast idle, then when it steps down to standard idle, it starts to gradually 'suffocate' - to me it was as it it was trimming back too far, though live data didn't show this.


I have a 2.5 MAF here, but guess thats different...

[Marks DTM Calib]

MDTM - WRT MAF, when I saw it, it was responding fine, approx 15kg at idle, up to 40kg when revved.  Obviously, thats what the ECU thought it was reading - not to say its not talking rubbish, just the figures looked plausible.

Additionally, when I saw it, it was defo only 1/3/5 missfire.  No evidence to suggest 2/4/6 missfire then...  ....so something has changed.

Its absolutely fine on warm up fast idle, then when it steps down to standard idle, it starts to gradually 'suffocate' - to me it was as it it was trimming back too far, though live data didn't show this.


I have a 2.5 MAF here, but guess thats different...

Yes, its different.

From memory, 12kg is about right for idle with 15 being a little high, once they get to 18+ it gets quite messy

If its heading north then you would expect the weaker bank to suffer first which would then progress to the other bank as is continued off track

[TheBoy]

MDTM - WRT MAF, when I saw it, it was responding fine, approx 15kg at idle, up to 40kg when revved.  Obviously, thats what the ECU thought it was reading - not to say its not talking rubbish, just the figures looked plausible.

Additionally, when I saw it, it was defo only 1/3/5 missfire.  No evidence to suggest 2/4/6 missfire then...  ....so something has changed.

Its absolutely fine on warm up fast idle, then when it steps down to standard idle, it starts to gradually 'suffocate' - to me it was as it it was trimming back too far, though live data didn't show this.


I have a 2.5 MAF here, but guess thats different...

Yes, its different.

From memory, 12kg is about right for idle with 15 being a little high, once they get to 18+ it gets quite messy

If its heading north then you would expect the weaker bank to suffer first which would then progress to the other bank as is continued off track

Ta

[Matchless]

Coil pack changed so lots of rummaging about behind 246 head....

Check all 3 earths are still attached to the back of the 246 head.

[Marks DTM Calib]

Coil pack changed so lots of rummaging about behind 246 head....

Check all 3 earths are still attached to the back of the 246 head.

Not present on drive by wire setups