Need help with idling problem

[DuncanM]

Hello everyone,

My car will not idle and just dies as soon as you take your foot off the throttle.

The car has been off the road for over 3 years and has just had new head gaskets/light head work (porting).

I have the diagnostic software and have set it up at 15%, opening up to 19.4%.

I don't have any screenshots yet but this only thing that appears amiss is the Baro mbar which is staying at 1000, could this be the fault?.

Does anyone know how to get to the Barometric sensor as we had a look in the passenger footwell but can't see it.

No logged faults (including Baro), the adaptives seem good and even at around -5% and the Timing deg is at 23deg at around 1500rpm.

with all this the engine is quite lumpy and is hunting, as soon as I come of the throttle the engine will drop down to around 500rpm then cut out.

The throttle linkage has play and I have some rose-jointed ends I will be putting on to resolve this.

I have driven the car around the block and it doesn't feel like it's missing at all, pulling well.

I know it could be a number of things, would love some suggestions, can't look at the car again until Monday due to working shift.

After all this time it is very frustrating! I'm sure I'll get it on the road to enjoy the winter .

Regards

Duncan

[JensenA]

The connection for the Baro sensor is tucked right up high in the passenger footwell behind the dash, sort of above where your knees would be.
Go into the Diags and clear all the adaptive maps and let it start from scratch.

[Gazzab]

Could it be that your head work has changed the engine such that it needs a new fuel map?

[DuncanM]

Thanks for the replies.

I will have another look for the baro sensor on Monday.

Gazza, I am hoping that I'd at least get an idle as the head work wasn't too extreme (I think!). But you may well be right and I'll certainly look into this. I need to get the car into a fit state to MOT first .

Any other suggestions very welcome .

Duncan

[Gazzab]

I had some headwork on my car - probably more than yours. The car was often stalling after this work. Not much fun trying to restart a cerbera as you travel down hill with little control trying to press the button!
A quick bit of fuelling remapping and the car seems spot on (better than ever).

[Byker28i]

Could it be a slight air leak somewhere on an intake?

[DuncanM]

That's interesting Gazza, I'm still hoping to get an idle to get through the MOT but this is worth considering.

Byker, yeah good point, I'll be spending most of Monday with the car and will check this thank you.

Duncan

[DuncanM]

• Update**

Well I can get the car to idle but I have to have the throttles open at 23%.

I have got the adaptives down to around -5% on both banks.

What do the experts think of this? 900rpm idle with good adaptives but I cannot get this without the throttles showing 23%.

No matter what I tried to do the car will not idle with the throttles at 19% as advised in the how to's.

I am interested in peoples views/opinions on this matter .

Next stop MOT!

Regards

Duncan

[FarmyardPants]

Maybe gazza is right!? Setting the t-pots higher will cause extra fuel to be delivered. Did you have he heads skimmed? If you increase the CR you'll probably need to adjust the timing and/or fuelling to maintain idle. Effectively the engine will be more difficult to turn over, at low rpms this might cause idling problems especially if the engine isn't in perfect balance (in all senses).

[Gazzab]

Get it on a rolling road. That may help get a proper diagnosis?

[DuncanM]

Hi Guys,

It's certainly interesting, I thought I'd just have to change the ratio (open or close the butterflies).

But it likes 23% very much and idles there at 900ishrpm .

Gazza, rolling road is a definite but I need an MOT first .

Wish me luck!

Duncan

[DuncanM]

I hate bumping my own post but I'd realy appreciate some more opinions/views on the fact my car needs 23% throttle to idle at 900rpm .

Please note that the balance is still air and fuel, similar to just carrying on opening the throttles past 19 to 23%.

Opinions please .

Duncan