Cutting out when idle.

[Mintz]

When i start the ignition, the car starts.
Although if i do not rev the engine, the engine starts to wobble and then cuts out after about 10 seconds.

- Head Gasket replaced not long ago.
- Engine Management light shows, although it's been on computer and apparantly no serious faults.

Daewoo Matiz 2001 SE
Y Reg

[Hicks12]

hmm, could be a fuel mixture problem? Sounds like the car engine isnt getting hot enough so a change in the fuel mixture might need to be done. Just like a choke on a bike, if a cold day or bike hasnt been run then open the choke to add more fuel and let it burn to increase to optimal temp.

[jimbouk]

Has the car been sat for a while, my Mondeo did this and just needed a good drive.

On the old Porsche I have a similar issue (low revs, sometimes dies), I think the actual problem is a leak in the vacuum system but a quick adjust of a screw to set the idle revs a bit higher has sorted it.

If you can hold the revs up and it's ok then it might be an idle setting issue, no idea how to adjust that on a car with a computer though!

[mycarsavw]

You say it has no serious faults.

What other fault codes were read?

[Sputnik]

Engine Management light shows, although it's been on computer and apparantly no serious faults

Ahh, that makes perfect sense! And the clown that did this probably advised to ignore it or take the bulb out?

[Mintz]

Mechanic who did the computer found these..

Mode 3, Static errors:
P0108 Height Sensor / induction
manifold pressure sensor
signal too large

Mode 7, Sporadic errors:
P0108 Height Sensor / induction
manifold pressure sensor signal too large

After this he reset so the light does not show.
He said:
' to find the problem the car will need to be striped down over two days '
' But it's not worth it,best to ignore the light as it will not cause you to breakdown etc'
(17/08/2010)

The car has worked fine since.
Until last friday when the light came back and today the problem /as posted.
(apart from once the car seemed to accelerate slowly for awhile).

EDIT: When the car was bought in October 2009 - Management light was showing - Light Switch was changed and it was removed

[Sputnik]

Mechanic who did the computer found these..

Mode 3, Static errors:
P0108 Height Sensor / induction
manifold pressure sensor
signal too large

Mode 7, Sporadic errors:
P0108 Height Sensor / induction
manifold pressure sensor signal too large

So it is a Wiring fault, Faulty sensor or an air leak on the induction system. I don't suppose he bothered to look at live data at all ? See what the fuel trims were? look for the signal from the MAP sensor? No, Thought not.

He said:
' to find the problem the car will need to be striped down over two days '

I think in a real garage that would be "it should take less than 2 hours to trace the fault"

[Mintz]

Guess not :/

Garage computer scan was done in are also electrical only.

[mycarsavw]

Time to find a real garage

Where are you based, maybe someone can recommend an Indy

[Mintz]

Changed the spark plugs.
Old ones had a build up of carbon on them.
(maybe it's running rich? or was before it's been in garage)

Altered screw next to lever to rev the car inside engine.

Seems to be working now

EDIT: Engine management light is still shown.
( I know alot of people just ignore this and car still runs fine )

[Sputnik]

Changed the spark plugs.
Old ones had a build up of carbon on them.
(maybe it's running rich? or was before it's been in garage)

Altered screw next to lever to rev the car inside engine.

Seems to be working now

What your doing is trying to mask the problem. The problem is still there. If it is to do with an air leak or incorrectly measured air flow, The fueling will be wrong and eventually will probably ruin your catalytic converter while in the mean time your MPG will have decreased.

EDIT: Engine management light is still shown.
( I know alot of people just ignore this and car still runs fine )

Yes, Because they are stupid and trying to fool themselves that the light came on for no reason.

[mycarsavw]

Meh, I tried to be generic but if you're changing spark plugs to fix a manifold pressure sensor....

The fault codes you're getting are, imho, a result of having taken the head off. The sensors need to be disconnected to get the head off and it sounds as though they've not been reconnected properly.

Check they're connected yourself.

Check the inlet manifold hoses are all connected too.

Sporadic codes mean just that, the issue isn't there all the time, usually clearing the code will cause it to go away.

The fact you've got the same code under sporadic and static means there's an issue to fix.

[Mintz]

Been to a garage told it could be a sensor for the fuel.