P1 Stalling
 

My P1 stalls when you stop quickly.
Its ok if you come to a steady stop although the revs drop to about 200rpm then back up to normal.

What do you reckon.

MAF or ISCV.
I'd go with MAF as it's cheapest at about £80 and the most damaging to the engine if faulty.
ISCV are about £300, or about £50 from a scooby breakers.
Done both on my classic over the years.

Air flow meter? My year 2000 did that and it was a broken maf?

Cheers guys. Was thinking MAF only its not very old at all.
Good thing is I was given brand new boxed one with car.
Will try it .
What is it with these bloody MAFS

Is the ISVC the idle control valve

Are you using the clutch pedal :doubleup:

If the maf doesn't work I've still got an idle control valve from the car if you want to try it?

ICV mate, mine did the same thing. Be warned though there is a rubber gasket under the icv, buy a new one before removing it because if it comes out you will never get the bloody thing back in!

:lol::lol::lol: My thoughts exactley!

blast both the ICV internally and MAF with carb cleaner, My 05 wagon used to hunt and run lumpy, the MAF was filthly so i cleaned both and all was returned to normal service.

Big Tel, is that the pedal on the left :-)

Greig
Thanks mate, I will give you a shout if it's not MAF. Top man

Guy, yes mate , I did one on my classic, I know exactly what you mean.

Cheers all, much apreciated

There isn't on the Phase 2 Classic engine IIRC.
It just plugs into the side of the throttle housing.
Don't touch the plunger or try and clean it though as it has a habit of winding right out and dismantling itself.

Rich
I'm going try new MAF first, as I have one. Then order rubber gasket , give valve a good clean .
See how I get on.

Just a thought,possible fuel issue, rust in tank partial blockage of in line filter.

Scott
Now I think about it, yes your right.
On my classic, it's on the rear right side of the inlet manifold, we're as on my P1 it's on side of throttle body.

So, is it cleanable on phase 2 inlet ?

Greig, is yours off phase 2

Cheers

Oi do one Grandpa

No, that's how I found out they fall apart.
It's basically a small stepper motor that winds the plunger in and out allowing air to bypass the main throttle butterfly.

Oh right.
Steppers normally very reliable.
Any idea what fails on them?
300 quid is a rip off for a stepper motor

MAF as said, or does it have a dump to atsmosphere dump valve? probably open on idle.

Never had a problem cleaning stepper motor.. just make a rough note of location of plunger, clean and replace in similar place.. ecu relocates it (original) if on an after market ecu like apexi it wont know the position and will just wind it out and out if you reset it at a different location to it was (further out).
The do get gunged up.

Simon

Ah bugger, sorry Crowman

I loaned him my standard recirc one and it made no difference.

Simon, as Rich said I borrowed his original dump valve as that's 1st thing I thought of, as had prob on my classic with aftermarket dump valve.

Thanks all for input

I will be in touch soon Simon, as full 3 inch RCM system going on soon and will require your services :-)

No worries Guy

Update
I have fitted new MAF , no change.
Removed and cleaned idle control valve , was very mucky and sticky

Not stalling now, but only just

http://i376.photobucket.com/albums/o...h_04b2b04f.jpg

Doesn't a Proper P1 ;) have a big rev counter in the middle ??
Idle level looks about right, the Hawk idles lower then my old Classic, but cold idle is alot faster which is annoying for the neighbours ;).

Funny you should mention that as we spoke about that when mart popped over. :?

Idle looks right but the return to idle doesnt.

Could well be the stepper motor still, worth trying another.

Have seen a few 99/00 cars now with issues on standard ecu and on replacing ecu with after market can map around it. Thats not to suggest you should do this, but that there is nothing major at fault.

Have to you reset the ecu since the clean?

Simon

It is that, especially with a decat:wife:

I could have lowered it had I know it was a pain when I saw you last.

Scott
My car Is the prototype, and still has a type r instrument cluster, as well as IC spray which P1 doesn't have.
In mechanical terms it's a type r with P1 running gear , better brakes and the above

Simon
I have not reset ECU , is it same as ver 2 to reset

Thanks

Yes it is same to reset.

Cheers mate

No worries mate, I doesnt sit still for long!

I'm 99% sure my one is a phase 2 inlet, I'll check at the weekend if it is your more than welcome to pop over and pick it up to see if it works

Greig your a star if it is, cheers mate

no problem

Update
Greig very kindly gave me an icv to try, so I fitted it and as suggested by JGM I've reset the ECU
Still the same:-(
So I'm going to fit the decat and get it booked in with Simon, and go from there.

Vids from today

http://i376.photobucket.com/albums/o...h_1dfbca8c.jpg

http://i376.photobucket.com/albums/o...h_958cf590.jpg

That is strange. As you say though, once on the rollers, it will hopefully become obvious.

It doesnt stall now, but as you can see and hear it virtually stalls.
The idle control valve is 2nd hand, so cant be 100% its ok, but to have exact same symptons, im guessing its something else.

It has been mapped before and i have rr print outs, will be interesting to see what Simon finds

Am i right in saying you haven't tried a different MAF yet??? or would this fault not relate to the MAF?

Your more than welcome to take all three bits off mine at once to try ie, MAF, ICV and dump valve, next weekend though :-(

New MAF fitted mate. Might try you icv just to be sure , cheers mate

Is it defo a new MAF fella or are you just going on some one's say so from when you bought it? Id try my ICV fella, got nothing to lose.

100% new MAF mate

It won't be anything to do with the map unless it's been mapped for different injectors and it's running incorrect at idle.
If it has just had an ecutek tweak I doubt they would of touched anything idle related or idle control related. ECUTEK may of been able to adjust idle but I'm not sure the ECUTEK software has the ability to change idle control parameters.

You can knock the idle up with ecuexplorer http://code.google.com/p/ecuexplorer/downloads/list, but you will need an OBD cable to do it and it will reset if you reset the ECU.

Unplug the ICV and seE what happens... I left mine unplugged on my RA when it played up

Have you checked the DV return hose (where the recirc normally connects) both ends to ensure sealed and the also the hoses on the underside of the intercooler.

Also check the ally mounting where the intercoller hoses mount/connect to the underside of the intercooler and the intake hose to the turbo where it conects to the turbo. the hard plastic pipe is rubbersied at the end it connect to the turbo and can split or get pinched by the jubilee clip.

If it were you MAF surely you would also notice a difference when on power ?

I've had two MAF failures but did not experience engine stopping when braking hard.

It started to run rough and became progressively worse over time.

Cheers guys
I think i will take the IC off tomoz and check out all pipes etc.
I was convinced it would be dump valve as its exactly what my classic did when it had top mount IC and I fitted a bailey dump valve.
But I have tried majorscoobs one.

Mine gave a couple of hick-ups when pulling to a stop then later inthe week stalledon me. New MAF and never done it again.

Worryingly, the difference in power is that they can give you more, as they tend to fail lean and cause detonation. Which makes them dangerous in this condition.

on the first video you can see the dumpvalve is still open?

Simon I will take a look again today.
I was sure it opens as you rev and then slams shut again.

I could see it move when you rev and cover the hole and then open when you lift off and stay open?