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[Budgie]

Hi,

I had a good look around the forum before posting this and couldn't find any other reference to this condition. Anyhoo apologies if I missed a similar post.

My car is exhibiting a condition which may or may not be a fault symptom and I would be interested to learn if any other owner has had a similar experience.


My car is an Elite 2.5 V6 Auto 2000 X Reg

The condition is related to the rate at which the car slows down after lifting off the gas pedal.

The condition is most noticeable during urban driving and manifests itself as follows: -

When lifting off at around 50mph the car will slow quite rapidly (as expected) to 42-43mph. At this point it will hold power and speed as if the cruise control had been selected. It will however after 10 seconds or so continue to slow (albeit at a reduced rate) to around 32mph when it repeats the above cycle again. The same applies when lifting off at 40mph - i.e. slows to 32mph and then holds power and speed.

Now this can be fairly disturbing when driving around town to say nothing of the brake wear increase.  

My local VX man says this is normal for the electronic autobox fitted to the 2.5V6 Facelift.

My engine idle speed when stationary in 'P' or 'N' appears to be [size=12]around 600**[/size] rpm however this does of course increase as expected when selecting a forward or reverse gear during parking. Curiously when selecting 'D' whilst stationary the car does seem to 'amble' forward rather than the expected 'creep'.

Other info - have recently had cam covers and gaskets/'O' rings replaced as well as breathers cleaned.

I would welcome any sound advice or comments anyone may be able to offer.  

** Update - Ooops! have now cleaned bi-focals   it is nearer 550 - 600

[ngrainqey]

would have said it was the idle speed set too high or the throttle sticking...
the auto doesnt have as much engine braking...
why dont you manually drop down next time your out and see what happens?
post results?

[Richard A]

Idle speed when in gear should be about 550rpm, out of gear normal tick over should be between 550 to 600rpm, just under 1000rpm is wrong, ie not correct, check for air leaks (vacuum pipes), clean the idle valve, check the throttle body is clean and returns to the stop when not under pressure.
regards
richard a

[Jay w]

your idle does seem a little high, it should be about 650 or 700 with climate on.

my 2.6 doesn't seem to slow very well off the gearbox, i have just put if down to it being a feature of autoboxes

[Budgie]

your idle does seem a little high, it should be about 650 or 700 with climate on.

my 2.6 doesn't seem to slow very well off the gearbox, i have just put if down to it being a feature of autoboxes

Have amended post - sorry guys yes it actually is around 600 rpm

[Jay w]

your idle does seem a little high, it should be about 650 or 700 with climate on.

my 2.6 doesn't seem to slow very well off the gearbox, i have just put if down to it being a feature of autoboxes

Have amended post - sorry guys yes it actually is around 600 rpm

if that's the case then yes that does sound right

[Budgie]

After living with this condition sine 2008 I have at last associated it with the AC climate control being activated. If I switch the AC off the engine's deceleration is normal.

[Kevin Wood]

The idle speed should increase a little to compensate for the air con, but not to a noticeable degree. I wonder if the ICV is sticking somewhere around the 600 RPM point?

[Gaffers]

My thoughts are sticky ICV or dirty throtle body

[Budgie]

Thanks for the advice guys - it's appreciated. 

[symes]

Clean throttle butterfly linkages-were throttle cable goes=reckon its dry/sticking=spray it with wd40 or any lube mate