Hi,

I have recently purchased a punto 1.2 8valve ELX MK2 2000 model from my brother for £200 that has some issues, The rad fan is on continuesly the temp gauge does not have a reading but the light is on and it seems to also be causing the car to rev high on idle and have no real control over it. I took the airbox off and it is sucking very hard from the small opening below the butterfly throttle hole. when i cover the whole to only let a small amount of air in it seems to idle ok. I have had the reading on the ecu stating temp sensor swapped over and having the same problem. been told by an auto electrician it could be the ecu to blame?

Please help

If the fan is constantly running from moment you start up
the temperature sensor / Sensor Wiring is to blame, that car is in Limp home mode, as the car can't see the water temperature so It runs Very rich, Runs the Fan and its a Slow Steady drive home

But make sure the Water Level is correct, bleed the Cooling system, And Then check fluid level again as well


As for the High revving - i'd be guessing there is a leak around Inlet manifold - Have a Rummage around to see if its not sealed up against the head nice or if there is a Gap or hole somewhere

Ziggy

What work has been done on the car recently

its had the head skimmed as is overheated and new a new head gasket?

Either the Head is able to suck air in - which means a bad job has been done

or the common problem people also get is the Intake manifold doesn't seal up against the head
Or the TB is not seated happily either

Ziggy

would that cause it to rev high from the idle intake? also how do i get it out of limp mode?

munroe13 said:

would that cause it to rev high from the idle intake? also how do i get it out of limp mode?

Click to expand...

To stop it been in limp home mode, is to fix the reason why its going into it
Usually the Wiring or the Water temp Sensor is at fault
so check wiring and replace sensor if need be

And a Leaking Inlet manifold would YES cause a High idle, its sucking in air that shouldnt be sucked in, it should only come in via the Throttle Body at the top there

Ziggy

The ECU sees air coming in so adds fuel - engine revs. You can use a length of hose to listen through for hissing noises or spray superstart (carefully) and see where it cause the engine note to change.

Check the servo hose and head to manifold joint.

it does only suck from the throttle body but very heavy suction like a hoover causing it to rev high. it sucks from the small dome above the perfect circle. does that make sense?

wd40 might be better as its not so volatile
obviously sdome prefer the smell of old fishermens pants to the sweet smell of the wd

When I sprayed WD40 down my throttle body it nearly stalled the engine. Superstart is volatile but evaporates so fast its almost instantly gone. But of course spray it carefully or you wont know which bits its finding holes in. Ideally use a WD40 type straw on the can.

some kind of progress. when i cover the idle hole it still runs but not as rich as it should on normal idle so it is getting sum air from sumwere. i have taken the inlet manifold of but hav not diconnected the water hose etc so cant really see it all round out of the car. where am i looking for the melted parts if any.

Put a second hand ecu trnasponder / fusebox and ignition barrell and fixed the problem

Well done for sorting it Munroe but Ive no idea how a new ECU could fix the revving fault.

Can the experts explain this one?

ECU dodgey?
Weird But moving the Ecu around, could have sorted a Weak wire or something

If the fault comes back, stick the original Organs back in
And then find the fault

i must admit its weird....

Ziggy