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[Boatboy]

Wild card maybe, but have you done anything different re fuel?

ie changed brand or RON.

[Kevin Wood]

I saw a 3.2 recently performing like a 1.0 Micra. Intake ducting that feeds the bottom of the air box was sucking in on itself and starving it of air.

Can't see much wrong with the live data. Have the plugs been changed ?

What about fuel filter? :-/

Kevin

[JamesV6CDX]

I saw a 3.2 recently performing like a 1.0 Micra. Intake ducting that feeds the bottom of the air box was sucking in on itself and starving it of air.

Can't see much wrong with the live data. Have the plugs been changed ?

What about fuel filter? :-/

Kevin

Nothing changed at all. Just the thermostat and cambelt kit.

Was a rocket before - is now a snail by comparison 

[ffcgary1]

Fuel filter, try changing it just to eliminate it from the probables, fuel injectors, could they be contaminated and partly blocked, you may have dragged some crud up from the tank.
Are you certain that you dont have an o ring dodgy. top end?
 :-?

[albitz]

If it was OK before the work was carried out, that would suggest a very careful recheck of cam timing might be needed. :-/

[JamesV6CDX]

If it was OK before the work was carried out, that would suggest a very careful recheck of cam timing might be needed. :-/

This initially happened after JUST a stat change, so cam timing wasn't in the equation.

Cam timing is absolutely spot on, set up with the correct kit and all torqued to spec.

[tunnie]

If it was OK before the work was carried out, that would suggest a very careful recheck of cam timing might be needed. :-/

This initially happened after JUST a stat change, so cam timing wasn't in the equation.

Cam timing is absolutely spot on, set up with the correct kit and all torqued to spec.

How cold was it running? If it was running too cool, would it not be over-fuelling, giving a slightly improved ooomph?  :-/

Can't see how else a stat change would affect performance  :-/

[JamesV6CDX]

Wasn't running that cool, stat was tired, but not knackered... only noticed it overcooling a tad on a run...

[ffcgary1]

It seems to me the MAF is now the only thing left to check/swop out, 3.2's are known for being hard on MAF'S. This would affect performance.

[YZ250]

I saw a 3.2 recently performing like a 1.0 Micra. Intake ducting that feeds the bottom of the air box was sucking in on itself and starving it of air.

Can't see much wrong with the live data. Have the plugs been changed ?

What about fuel filter? :-/

Kevin

Nothing changed at all. Just the thermostat and cambelt kit.

Was a rocket before - is now a snail by comparison 

Fully sympathise with you on this as what you describe is exactly what I posted way back in July 2010 regarding my 3.2.
I only removed the plenum to change the cam cover seals and ventilator box and when I put it back together the engine power was flat. Like yours, I can visually see both multi-rams pulling under vacuum when someone revs the engine. I removed the plenum again, checked everything and it is still the same.
Interesting comment about the gearbox. When mine was running like a missile it would kick down if you floored the pedal at about 80mph in sport mode but since the plenum removal it sometimes just builds up speed rather than the awesome pull on kickdown that it used to have before I touched it. We both know that this is not a deterioration of something over time.
As you say, it went like a rocket before the plenum came off and is now flat which is exactly what happened to mine.

If you find the cause further down the line would you be kind enough to PM me of your findings. My hands are blistered and burnt from pulling vac pipes off the hot engine after your post triggered off my curiousity again.

Regards
Alan

[aaronjb]

So .. do neither of your cars kick down at all, and both change up early?

That would definitely point me toward the throttle position sensor or perhaps the throttle actuator (which presumably has a check-sensor built in).. dickey connection there, perhaps, after removing the plenum?

[YZ250]

So .. do neither of your cars kick down at all, and both change up early?

That would definitely point me toward the throttle position sensor or perhaps the throttle actuator (which presumably has a check-sensor built in).. dickey connection there, perhaps, after removing the plenum?

Mine does kickdown but not at the higher speeds that it used to. This problem seems too similar to not be related. :-/
As plenum and vac pipes were the only things touched it's got to be linked to that surely but I just can't see anything wrong. No codes present on mine. As James said, they run fine when driven normal.  :-/
I do not have the knowledge as far as live data goes but the end result is that we both had cars that flew, we removed the plenum and now we both have cars that are not as they should be. As said, it's not a deterioration of something. They were fine until the plenum came off. Mines been hooked up to my mates snap-on modus and shows nothing wrong so I am now depending on James.
No pressure mate.

Regards
Alan

[Lazydocker]

So... The plenum has been off. I'd be checking and rechecking the o-rings... All of them. And the breathers

[YZ250]

That would definitely point me toward the throttle position sensor or perhaps the throttle actuator (which presumably has a check-sensor built in).. dickey connection there, perhaps, after removing the plenum?

Good point. Do these need re-setting/ re-calibrating after throttle body plug disconnection or is it not affected?  :-/  I assumed as nothing had changed it would be OK. Just thinking out loud as they are both 3.2 DBW.


 

So... The plenum has been off. I'd be checking and rechecking the o-rings... All of them. And the breathers

I agree it's plenum or vac related. 

JamesV6CDX,
Apologies for butting in on your post.
I don't want to tread on your toes by answering on your thread so I'll take a back seat now. It does seem that our problems are connected. I'll continue to watch with interest. 

Regards
Alan

[unlucky mark mv6]

If its any help james,the fuel filter was changed some time last year,along with the plugs,and new dispack on drivers side.