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[PLANETNZ]

lack of power, "hunts", dies when getting the boot up to it. Nothing logical as yet!  and no fault codes

Yes i have had a search through previous posts but still cant really find an answer!

so its 99 2.5 Japanese import, breathers cleaned, new DIS-leads-plugs and a new non OEM MAF. Runs "ok" until your around 3/4 boot up its ass, then it buries its nose into the ground gives up and dies (French?)
However if your "gentle" with it it goes ok and the MPG is reasonable (indicating all is well) not unlike my ex.

I have a previous post of similar nature and everyone says its the new MAF however im not that convinced. After watching the block values on the device thats "not allowed to be mentioned", its working well enough, I cant see how it would cause this!? ( i can see how a not-quite-right MAF might make the ECU run lean or rich but not just bloody die!?)

anyway, in the back of my mind ive kinda figured the manifold actuator might be an issue but I hadnt that long ago checked them (working fine) and nothing coming up on the "device that cannot be named" did nt check again until today..

so #1 isnt working!..The back one.   It has vacuum (both do) all lines checked and tested, both have voltage however when i swap the supply lines around the #$%^#& car starts hunting!?  Yes have double checked the vacuum power and the device that cannot be mentioned says its "inactive"  again like my Ex (and possibly the French)

So who feeling Bright tonight...any ideas??

[terry paget]

To check if its the MAF, unplug it and see. The engine will run normally in a default mode, using information from other sensors. The engine management light will be on, but ignore that.

[PLANETNZ]

yea cheers for that but we are way past that...

[Andy H]

It reads like a classic case of fuel starvation or blocked air intake. I cannot remember whether you have been through the basics (eg new fuel filter, air filter, test fuel pump output pressure)

Failing that it could be a wire that breaks contact when the engine rocks on its mounts. I have seen this on a car with points ignition. On the Omega the prime suspects would be crank sensor and the big round multi-pin plug next to the battery (if the locking ring isnt done up the plug can work loose).

[cem_devecioglu]

ignition components wont let any code stored , may be some lambda readings

do you mean some rpm limit with saying 3/4 boot up..

I would try (check) these
crank sensor,  cam sensor   , throttle position sensor

and cam timing..

[PLANETNZ]

yes (fuel starvation) it feels exactly like that however all new filters including fuel within the last few months, i even removed the intake elbow at the air intake and gave it a run just to confirm the filter wasnt blocked..
The TPS also seems to be working fine.
Now the weird thing was when i changed the vacuum lines around the engine "note" changed and ran slightly "different" but in not in the same way as leaving the pipe off (purposely giving a vacuum leak)  weird

[Andy H]

In answer to your original question..

I don't think the flaps could stall the engine. They open and close to alter the effective length of the air intake system by opening passages between the two sides of the air intake. They never block the route of the incoming air.

I wasted a lot of time a few years ago with similar symptoms on my X25XE (misfire on wide throttle opening at low revs). A new set of spark plugs fixed it 

[PLANETNZ]

hi, just to clarify its not miss-firingits, for want of a better word "bogging down" after 1/2 to 3/4 throttle

[chrisgixer]

Intake manifold valve (multi ram) would cause a flat spot above or below 4k rpm, not a bogging down so much.

There is an actuator test on the diags software, if its the one I think it is.

If genuinely inactive, Is it plugged in electrically? Or, Swap it with the front one to see if the fault moves with the valve. I'm fairly sure the valve is the same, but not sure about the internals.

If a proper bogging down I'd be looking at ignition issues as well, if the maf looks ok, going by your description.

[PLANETNZ]

thanks for the comments. Its the way the car is running that has me a bit confused. it runs fine low rpm but bogs down at revs.  from comments previously it feels more like a fuel starvation thing but off the peddle its more electric issues. IE instant. I have activated both rams the front works or at least shows "active" the rear doesnt. However when testing the valves work on an independent power supply and again when "unhooked".  so its working but only showing at some times..Changed the valve with the spare air pump supply one. Noting is showing up on the "device that cannot be mentioned"
Im kind heading owards some sort of electrickery thing but it doesnt "feel" like it under the foot

Got me stuffed!

[Marks DTM Calib]

So there is a multiram code, cant see this being the route cause but worth addressing to remove the code.

The valve that is associated with the air injection (mounted on the radiator) is the same type and can be swapped if required.

Your symptoms hint at one of the following:

1) Fuel starvation - think we mentioned the fuel filter before?
2) Air starvation - so checking that the airfilter housing and ALL associated feeds are clear
3) Exhaust blocked

[cem_devecioglu]

who is this Fuse18 -someone must tell him he is in the wrong socket   [runs and hides]

[PLANETNZ]

who is this Fuse18 -someone must tell him he is in the wrong socket   [runs and hides]

Hi, no multi ram codes or any codes what so ever.
I Suspected #1  solenoid as part of the problem but it is receiving 12v signal and is operating. I changed it with the old SAI unit to eliminate.
It was only when it was hooked up to the computer it wouldn't activate when it was mounted where its supposed to be but did when it was off!? All the block readings show everything is working. 

Im going to pull off the top and give it a good go over. Im starting to wounder if it is a break down in the spark plugs somehow. I doubt it but...

[PLANETNZ]

So there is a multiram code, cant see this being the route cause but worth addressing to remove the code.

The valve that is associated with the air injection (mounted on the radiator) is the same type and can be swapped if required.

Your symptoms hint at one of the following:

1) Fuel starvation - think we mentioned the fuel filter before?
2) Air starvation - so checking that the airfilter housing and ALL associated feeds are clear
3) Exhaust blocked

new filters and no Cats

[chrisgixer]

Oil in plug wells? or has been in the past?