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Author Topic: 3.2 still a little unhappy  (Read 12711 times)

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JamesV6CDX

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3.2 still a little unhappy
« on: 14 March 2011, 09:49:12 »

My 3.2 is still not quite right.

It was fine when I picked her up – really, really pokey, you had to be careful with the throttle because the slightest touch would throw you back into your seat!

However, since taking off and refitting the plenum, inlets etc to do the thermostat, she’s lost all her get-up-and-go.

The best way I can describe it, is that she’s like a 2.5 – almost asthmatic. It’s not seriously underpowered, and totally drivable and smooth, but I know very well it’s not right.

Other observations are:

1.Only fault codes are the pre-cat issue, so not going to be related.

2.Economy is OK I think. (2 of us to Wales and back, A roads, boot full of kit - 30.2mpg)

3. All Vac pipes intact and connected correctly. Triple checked.

4. Main servo hose to plenum intact and tight.

5.Idle is 0.3 to 0.4 gal/h

6. There seems to be much more power in the higher rev range – it’s low-down the rev range it seems to be much less pokey. (I’ve had someone rev the car, and can see both ‘rams operating visually).

7.When you hoof it in sport mode, it seems to change up at around 6000rpm – I’d have thought it should rev higher than this! Feels too early for a gear change, in sport mode.

8. Gearbox has been behaving a little oddly – holding it in gear for too long, and then changing into the next gear with a very small ‘thump’ – this is intermittent, not sure if related, as this is the first A-Road run I’ve done with her.

I did think that the seals on the inlet bridge, plenum O rings etc looked a bit past their best, but, there is no noticeable air leaks.

Are there any other values in the live data, I could be checking?

Any suggestions would be VERY gratefully received… I love this car, and will do anything to keep her mint :y
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Jimbob

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Re: 3.2 still a little unhappy
« Reply #1 on: 14 March 2011, 10:00:18 »

post up the live data snapshot, may throw some light.

autobox - you know em well enough, could just be fluid, could be new box time, not far from the symtoms my old box had - nothing really wrong with it, just worn out (but it was an AR25 on a chipped etc 3.0)

tunnie

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Re: 3.2 still a little unhappy
« Reply #2 on: 14 March 2011, 10:15:07 »

re-checked the cam-belt timing? could it have slipped a tooth?  :-/
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JamesV6CDX

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Re: 3.2 still a little unhappy
« Reply #3 on: 14 March 2011, 10:17:57 »

Quote
re-checked the cam-belt timing? could it have slipped a tooth?  :-/

Not a chance - I changed the belt kit myself, triple checked everything incl torques etc...

(Plus, the cambelt hadn't been touched, at the time the car lost it's 'go')

:y
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tunnie

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Re: 3.2 still a little unhappy
« Reply #4 on: 14 March 2011, 10:19:42 »

Quote
Quote
re-checked the cam-belt timing? could it have slipped a tooth?  :-/

Not a chance - I changed the belt kit myself, triple checked everything incl torques etc...

(Plus, the cambelt hadn't been touched, at the time the car lost it's 'go')

:y

Ok, so what other things have been changed? (sorry not kept up to date on your project)

Done anything with the fuel filter?

Is it just plenum removal thats been done to cause less ooomph?
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JamesV6CDX

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Re: 3.2 still a little unhappy
« Reply #5 on: 14 March 2011, 10:22:37 »

Quote
Quote
Quote
re-checked the cam-belt timing? could it have slipped a tooth?  :-/

Not a chance - I changed the belt kit myself, triple checked everything incl torques etc...

(Plus, the cambelt hadn't been touched, at the time the car lost it's 'go')

:y

Ok, so what other things have been changed? (sorry not kept up to date on your project)

Done anything with the fuel filter?

Is it just plenum removal thats been done to cause less ooomph?

Only jobs that have been done, are

1) Thermostat (so plenum off)

2) Cambelt kit, water pump, aux belt, aux belt pulley (plenum off again)


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ffcgary1

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Re: 3.2 still a little unhappy
« Reply #6 on: 14 March 2011, 12:01:31 »

As to the gearbox issues, it sounds like a problem with one or more of the solonoids that change the gearing, They are easy enough to change but as you know requires main gearbox sump down to do.
Poor performance is more difficult to tie down, dont dismiss the zorst senor issue it could affect the engine ecu in some small way and if you are sure that you dont have a timing issue then you have to look at poss air leak on or around the plenium or maybe multi ram not working.
Have you checked the vac tanks, or the seals on the intake manifold, it is going to be something small and silly that is letting you down.
Good luck james, if its there you will find it. :y
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Jimbob

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Re: 3.2 still a little unhappy
« Reply #7 on: 14 March 2011, 12:07:46 »

Im thinking MAF, they are not uber reliable on the 3.2's, so sould be interested to see live data at idle and load.

YZ250

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Re: 3.2 still a little unhappy
« Reply #8 on: 14 March 2011, 13:07:14 »

I'm following this thread with interest as what you describe is very similar to what happened to my 3.2 after I had removed the plenum to change my cam cover seals.

Like you, I have triple checked everything that I touched, including removing the plenum again. I'm hoping that your solution will be mine.

My symptoms at the time were explained here:

http://www.omegaowners.com/forum/YaBB.pl?num=1277984602

Sorry I can't solve it but it does seem spooky that the only thing disturbed was the plenum.  :-/ :-/
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Re: 3.2 still a little unhappy
« Reply #9 on: 14 March 2011, 13:08:45 »

Quote
...Any suggestions would be VERY gratefully received… ....

you've checked for any 'spare' hydraulic lifters in the boot ........  ::)  ::)  ::)
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SP_3.2

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Re: 3.2 still a little unhappy
« Reply #10 on: 14 March 2011, 13:24:45 »

May have been something that you have checked James, but thinking there could be a blockage in the exhaust My old one before replaced had the internal wading coming away could just see it if you looked into the back box with a light ...But could not tell just looking at it day to day. Just a thought. Took the power down on mine until replaced
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JamesV6CDX

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Re: 3.2 still a little unhappy
« Reply #11 on: 14 March 2011, 13:29:59 »

Quote
May have been something that you have checked James, but thinking there could be a blockage in the exhaust My old one before replaced had the internal wading coming away could just see it if you looked into the back box with a light ...But could not tell just looking at it day to day. Just a thought. Took the power down on mine until replaced

Seems like too much of a co-incidence, though Steve - considering it was fine one min - but not the next, as soon as plenum re-fitted?
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SP_3.2

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Re: 3.2 still a little unhappy
« Reply #12 on: 14 March 2011, 13:40:07 »

That is a good point...hope it,s sorted soon for you as it,s a great looking car :y :y.
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harpersimon

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Re: 3.2 still a little unhappy
« Reply #13 on: 14 March 2011, 14:03:24 »

did you take the inlet bungs/rags back out :-)
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JamesV6CDX

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Re: 3.2 still a little unhappy
« Reply #14 on: 14 March 2011, 14:43:00 »

Quote
did you take the inlet bungs/rags back out :-)

Yep! :y
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