General Punto mystery problem.

[Atticus!]

right i posted in tech talk with no reply so ill try here.

My engine keeps randomly misfiring whilest driving along.

The engine will be fine then suddenly misfire for about 20 seconds and then will clear itself and will be fine fine for a while until it happens again.

i took it on the motorway for along longish drive and it seemed to pretty much die completely after a while. But after leaving it on the drive for a couple of hours it seemed ok again.

Ive had a head gasket,water pump, termostat, oil filter, cambelt, new leads, plugs, coilpacks, lamda sensors and cat about 100 miles ago so i am baffled.

Any engine boffins got any advice as it would be greatly appriciated.

 

[Ffoxy]

It might be a blocked fuel filter if fitted, drivers side rear wheel-arch area IIRC.

 

[aca]

Any EML lamp on dashbord
Any diagnostic code read?
If not - try to do "Self learning phonic wheel" procedure (reset ECU).
Also put him on diagnostic code reader.

 

[Atticus!]

nope to eml light on and code reader shows nothing, how can i tell if the fuel thing is ok?

 

[Atticus!]

Actually scratch that, it was midfiring quite badly earlier and the EML light started flashing, what could this mean?

Need some good advice as im sick of throwing money at the engine and it still not being fixed!

 

[dave]

flashing eml is missfire, used the guide to check if its ecu?

some code readers only read live codes you need examiner or fes to read stored codes

 

[Brin]

get a decent code reader and post codes on here so you know which cylinder if not all it is misfiring on...

had one in at work ECU is gone sounds like same as yours...have fun with that one lol

keep driving it and you can say bye bye to your piston rings

 

[Atticus!]

ah after reading that then i assume its going to be an ecu fault seeings as everything else is brand new!

Any local places to birmingham that repair ecu's?

or is there anything i can do to repair it?

 

[wilko92]

Does it back fire at all? mine was back fireing miss fireing and over fueling etc.. it was just old spark plugs... worth a shot?

 

[jip0]

ah after reading that then i assume its going to be an ecu fault seeings as everything else is brand new!

Any local places to birmingham that repair ecu's?

or is there anything i can do to repair it?

you can send them off for repair for quite cheap

Does it back fire at all? mine was back fireing miss fireing and over fueling etc.. it was just old spark plugs... worth a shot?

spark plugs are new

 

[wilko92]

what spark plugs? make sure they aint faulty.. it can happen

 

[Atticus!]

ngk ones i believe, but there brandnew.

Im gonna grab daves ecu and try that i think!

 

[Brin]

ngk ones i believe, but there brandnew.

Im gonna grab daves ecu and try that i think!

have you bypassed the engine imobiliser? if you plug his ecu you will need his ignition barrell and key

 

[dave]

have you bypassed the engine imobiliser? if you plug his ecu you will need his ignition barrell and key

no he wont

 

[Brin]

no he wont

hows this mate? i thought that if you swap ecu you need ingnition barrell and key as the key is coded to the ECU imobiliser?

am i wrong mate?

 

[jip0]

depends

virgin ecu's learn your cars code etc

 

[dave]

hows this mate? i thought that if you swap ecu you need ingnition barrell and key as the key is coded to the ECU imobiliser?

am i wrong mate?

brand new ecu it dont have a key or barrel

 

[DaveMcT]

ECU Testing Ltd sell exchange ECUs that are plug and play (see their website). Also replace coils, plugs and leads as a faulty coil can damage the ECU.

 

[Atticus!]

New ecu has not fixed this i now have no ****ing clue what to do lol

 

[dave]

pre cat lambda?

did you do the phonic wheel learn thing or what ever its called?