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[Moos3h]

Hi all,

OK, brief bit of history, my 2.5 V6 1998 Miggy has died on me a couple of times when approaching junctions and breaking.  I took off the ICV, cleaned it and bunged it back on.  All was well for a week and then it did it again.  This time, I just gave it a quick spray of WD40 (as I wasn't at home) and it was good as gold.

I ordered a replacement ICV and installed it today.  The cutting out problem has gone now, which is great, but the idle seems to be slightly higher (maybe 800rpm when hot) and sometimes seems to climb a bit for no reason.  If I swap back to the old one then the idle seems lower (450-400rpm) and more stable.

Also today when I floored it joining the motorway, it really seemed to hold itself back briefly in third, then did it again higher up the rev range.

So, anyone any ideas?  Have paperclipped but nothing.  I have ordered a replacement air mass meter and this is arriving soon (not geniune Vx as too expensive) - does anyone else have any other suggestions?

Top forum chap jimmas is going to come and take a look at some point, but I'd love some more thoughts before he gets here to see if I can rule anything else out.

Thanks for any help in advance!

Cheers,
James

[markey mark]

clean and lube it bud then check your breathers  

[Moos3h]

Sorry, should have put - it's a new ICV (as had cleaned and lubed the old one but it played up again).

Checked all the breathers and nothing seems to be block - fired some Carb cleaner down them anyway!

Since changing the ICV, the holding back problem seems to be better - I think....

Cheers,
james

[Matchless]

Is the rubber seal that the IACV pushes into in good condition? If its a loose fit on the valve you might have an air leak.

[Moos3h]

Ah, well that's interesting because mine doesn't fit as tight in the hole as it could do (fnarr fnarr etc.)

Might get one on order from the stealers anyway, just to be safe.

Cheers
James

[albitz]

I was also thinking air leak, could try some instant gasket between plenum and icv rubber. :-/

[ballcock50]

Quick tip if your checking for air leaks use a spray can of easy start. Spray around suspect area if tickover picks up you found your air leak.

[TheBoy]

just check that a previous owner hasn't tried adjusting the butterflies to overcome the issue.  Then look for airleaks.

Don't bother with the MAF - they never fail on v6 unless you have one of those chavvy filters and the oil kills it.

[Moos3h]

Thanks everyone for the help.

Think I've fixed the problem and it looks like it was a combination of things.

New ICV was no good - causing weird idling problems, so cleaned the genuine Vx one again and put it back on and that's all good.

And then I replaced the MAF and overall the car is LOADS better, there's only a tiny flat spot (which I gather is normal for a V6) and the car pulls properly through the revs.

Result, let's hope it stays that way!

Cheers,
James

[Falcon_II]

Quick tip if your checking for air leaks use a spray can of easy start. Spray around suspect area if tickover picks up you found your air leak.

LOL And if you find a bad HT lead you have a big Fire.

[ians]

just check that a previous owner hasn't tried adjusting the butterflies to overcome the issue.  Then look for airleaks.

Don't bother with the MAF - they never fail on v6 unless you have one of those chavvy filters and the oil kills it.

Didn't Albatross have a MAF problem a couple of weeks back?

[Albatross]

just check that a previous owner hasn't tried adjusting the butterflies to overcome the issue.  Then look for airleaks.

Don't bother with the MAF - they never fail on v6 unless you have one of those chavvy filters and the oil kills it.

Didn't Albatross have a MAF problem a couple of weeks back?

Agreed. TB this is not true. There were about 3 of us in quick succession who each ended up having to replace the MAF, all of whom saw drastic improvements, rectification of the LT Fuel trim error and better overall fuel consumption.

It is misleading to say that the V6 MAF never fails. This "may" be the case in your experience on the 2.5 and 3.0, but it is definitely not the case on a fair few 2.6 and 3.2 DBW cars recently.