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[TheBoy]

Idling controlled by ecu maps, temp, MAF and lamdas, and the ECU controls the throttle bodies to give the desired rpm.  Obviously, if the car has been messed around with and has non standard components like the incorrect injectors, ECU config, oiled air filters and so on, its going to struggle.


You MAF reading seems a tad high, unless the A/C was on.  Put the car in ECO and see if the MAF is the same.

But as your LTFT are off, that smacks of an airleak somewhere.  Reset the LTFTs, and monitor them,  If they move from 0%, its likely you have an airleak somewhere.

[olm]

Idling controlled by ecu maps, temp, MAF and lamdas, and the ECU controls the throttle bodies to give the desired rpm.  Obviously, if the car has been messed around with and has non standard components like the incorrect injectors, ECU config, oiled air filters and so on, its going to struggle.


You MAF reading seems a tad high, unless the A/C was on.  Put the car in ECO and see if the MAF is the same.

But as your LTFT are off, that smacks of an airleak somewhere.  Reset the LTFTs, and monitor them,  If they move from 0%, its likely you have an airleak somewhere.

The car was in eco.
What I have tried has been to play with the vacuum tubes of the plenum, one of them affects the idle, obstructing the entrance a bit improves a lot. That tube goes to a piece with a connector, right? Is there any scheme to see how it goes and what function does that piece have?

[Doctor Gollum]

There is such an explanation in the FAQ section 

[olm]

There is such an explanation in the FAQ section 

Yes, I already saw it and I used it to fix leaks from the rocker covers being clogged 
But I think I remember that number 3 goes to a part with a connector, what is the air intake for idling, what is that part and where does it go?

[sjc]

Vacuum pipe connection chart is here
https://www.omegaowners.com/forum/index.php?topic=90499.msg1155332#msg1155332

The only vacuum pipe that goes onto the plenum is for the multi-ram valve at the very back.  There is also the vacuum connection to the fuel pressure regulator which is underneath the plenum.

[biggriffin]

Either get the lambda's moved as per the guide,, or fit a pair of 3.0L downpipes with lambda's fitted as per the guide.

[olm]

Either get the lambda's moved as per the guide,, or fit a pair of 3.0L downpipes with lambda's fitted as per the guide.

I had thought about it. Do you notice a gain by eliminating the precat?

[TheBoy]

Either get the lambda's moved as per the guide,, or fit a pair of 3.0L downpipes with lambda's fitted as per the guide.

I had thought about it. Do you notice a gain by eliminating the precat?

There is a marginal improvement by using good 3.0l cats, and they are likely to last longer than the utter junk fitted to 2.6/3.2 cars.

Nobody suggested removing the pre-cats on 2.6/3.2 exhausts, just moving the lamdas

[olm]

Either get the lambda's moved as per the guide,, or fit a pair of 3.0L downpipes with lambda's fitted as per the guide.

I had thought about it. Do you notice a gain by eliminating the precat?

There is a marginal improvement by using good 3.0l cats, and they are likely to last longer than the utter junk fitted to 2.6/3.2 cars.

Nobody suggested removing the pre-cats on 2.6/3.2 exhausts, just moving the lamdas

Biggriffin has commented to install downpipes 3.0, since we are at work..

[TheBoy]

Either get the lambda's moved as per the guide,, or fit a pair of 3.0L downpipes with lambda's fitted as per the guide.

I had thought about it. Do you notice a gain by eliminating the precat?

There is a marginal improvement by using good 3.0l cats, and they are likely to last longer than the utter junk fitted to 2.6/3.2 cars.

Nobody suggested removing the pre-cats on 2.6/3.2 exhausts, just moving the lamdas

Biggriffin has commented to install downpipes 3.0, since we are at work..

Yes, it does give a marginal improvement, so worth doing.

They need minor mods to make them fit, from memory a few mm have to come off the manifold end, and obviously they need a lamda boss welded in post cat (which you would have to do on your 3.2 cats anyway, due to the failing starting cats).

[biggriffin]

Either get the lambda's moved as per the guide,, or fit a pair of 3.0L downpipes with lambda's fitted as per the guide.

I had thought about it. Do you notice a gain by eliminating the precat?

There is a marginal improvement by using good 3.0l cats, and they are likely to last longer than the utter junk fitted to 2.6/3.2 cars.

Nobody suggested removing the pre-cats on 2.6/3.2 exhausts, just moving the lamdas

Biggriffin has commented to install downpipes 3.0, since we are at work..

Yes, it does give a marginal improvement, so worth doing.

They need minor mods to make them fit, from memory a few mm have to come off the manifold end, and obviously they need a lamda boss welded in post cat (which you would have to do on your 3.2 cats anyway, due to the failing starting cats).

 Correct, grind about 2mm off the protruding bit from manifold end of down pipe,,, the improvements to performance aren't noticeable when driving, if there are any,

[TheBoy]

the improvements to performance aren't noticeable when driving, if there are any,

In my experience, it was slightly noticeable.  That said, the old cats were shagged, which might have been slightly degrading performance.