jeffmoses

iTrader: (3)

Hi,

I have a 1999 Impreza (mapped) which keeps cutting out, been driving for many months with no problems.

AA called this morning, second time this week and they think it could be idle control valve.

Its clean and cant really see how this could break as there is nothing to it and replacement does not seem to be cheap.

e.g. this is only one same on eBay and looks in worse shape than mine - http://www.ebay.co.uk/itm/Subaru-Imp...ht_1518wt_1351

Any ideas ?

This morning I turn ignition on and revs to 1.5 which it always has then after a few seconds dies.

Starts for longer now but cuts out, tried just pulling sensor off the idle control valve and it starts and revs higher (can you drive around like this ?).

Please help as not very happy...

All the best,

Jeff

wiggy1

iTrader: (7)

have you tried un plugging your MAF sensor, if its not that try your knock sensor, i had the same problem turned out to be the knock sensor wire had broken! hope this help wiggy1

James159

Air Flow Meter?

jeffmoses

iTrader: (3)

Hi,

Unplugged maf sensor and didnt seem to do anything, should it ?

Where is knock sensor ? Air Flow Meter ?

All the best,

Jeff

P.S. I'm no mechanic...

Rosy

If it was running when you unplugged it, it should have stalled (ECU has been compensating for the failed MAF I assume). If it didnt then the MAF needs changing (ecu should be throwing up codes I work of thought).

I am no mechanic so might be wrong (could be lots of things)

Hope you get sorted

jeffmoses

iTrader: (3)

Hi,

Just started car up then unplugged MAF sensor, no difference what-so-ever (didnt stall or anything) ? Plugged back in whilst running and no difference ?

Would this definitely suggest MAF needs replacing ?

All the best,

Jeff

phil1981

iTrader: (5)

has it thrown up a check engine light?
also look on jolly green monsters site for how to check engine codes

mbayley77

iTrader: (4)

Just sold an idle control valve on ebay for 99p so keep your eyes open as they presumably don't make too much on there.

James159

Un-plugging the MAF and it making no difference points towards a faulty idle control valve maybe.....

barker1

my 93 import cut out when car is warem and when i stop at traffic lights changed MAF and THROTTOL POSISON SENSOR any one help doing my head in

thanks

jeffmoses

iTrader: (3)

@phil1981 - No check engine light.

All - What to buy ?

Idle control valve ? From where ? This ? http://www.ebay.co.uk/itm/Subaru-Imp...d=321660317962

MAF - is it this at fault if unplugging and no difference at all ?

phil1981

iTrader: (5)

as i said earlier try reading fault codes to see if it has any errors
http://www.jollygreenmonster.com/error_codes.asp.htm

If it just cuts out it could be something more simple like dirty filter or there could be an error code.
If you get no error codes less likely to be maff or idle control, but thats not to say it isnt.

jeffmoses

iTrader: (3)

Tried this and no check engine lamp comes on at all ?

James159

If you un-plug the MAF and the tickover "corrects" itself, I would say the MAF is faulty and to replace. However, this made no difference you said.

Could be the Idle Control Valve, but may be something else? The eBay link you posted is the correct one for a UK Turbo 2000.

Maybe take it to a specialist to get problem identified properly mate.

chopperman

Have you checked all your vacuum hoses?

jeffmoses

iTrader: (3)

@James159 - as its cutting out cant get to specialist really The ebay part for £50 looks knackered to me, mine is all shiny on the inside ?

@chopperman - all hoses and connections look good and tight.

Its driving me nuts...

jeffmoses

iTrader: (3)

Ok if i start it cuts out.

Unplug idle control valve and start - ticks over (if slightly high).

1. Does this suggest Idle Control Valve is broke.
2. Is it safe driving around with it unplugged ?

jeffmoses

iTrader: (3)

Hi All,

Replaced Idle Control Valve and MAF Sensor... no difference at all... Arrrrrrrrrrrrrrrrgh...

Any ideas before I kick 10 tonnes of s***e out of it ?

jeffmoses

iTrader: (3)

Hi All,

For those interested or that have the same issue after replacing Idle Control Valve and MAF there was no difference.

Reset ECU yesterday morning and covered a fair few miles and all good so far

All the best,

Jeff