General Help needed, Car is randomly idling.

[gidi19]

Hi all,

Apologies if this has already been discussed elsewhere. I've tried looking and not found anything that matches my problem.

Fiat 500 L twinturbo 2015 plate.
Car has randomly started idling on start up. Will go away if I give the car some gas, but then will come back with a vengeance once the car reaches temp. I have scanned it with a cheapy scan tool and the error codes that come up are
P0221
P1120
P0121
P0351
P0352

On googling the error codes the P0221 and P0121 are in regards to a throttle position sensor.
And the P0351/P0352 are in regards to ignition coil packs.

Can anyone please point me in the right direction on what I should check/replace next,

In the video I have attached I am not pressing the accelerator, it is doing it by itself.

 

[varesecrazy]

Hi,
what is your history with the car?


Looking for recent work.. Or history of overheating..

On a basic 4 cyl engine, there is a recalibration procedure (1999 punto 1242 fire, as an example)


BUT the Twinair uses totally different kit...

I would look for an air leak 1st



IDEA: get the emissions checked


That will tell a story

Unburnt fuel, or rich / lean generally


Garages used to do that for a tenner


Tell us more

 

[gidi19]

Hi,

Thanks for your response.
Have had the car a few years, normal servicing. Nothing recently done.
Had a go at it today, removed the throttle body and cleaned it out.
Removed the 2 injector coils, looked for any visible defects, marked them and them swapped them around.
Started the car, and no difference.
Car just randomly revving up and down.
Took it for a spin around the block, and this time the car actually stalled.
An oil pressure low message came on the dash.
Drove it home slowly,literally 30 seconds and tried the diagnostic system. No error codes to report.
I'll try take it to a mechanic on Monday but am dreading that its going to cost a fortune to fix.
Ive read about the recalibration on these engines, but does it have to be done via a software procedure ?
I left the car running for 15 minutes, would that not work.
Any suggestions I would be grateful.

 

[AnthonyH]

Hi,

Thanks for your response.
Have had the car a few years, normal servicing. Nothing recently done.
Had a go at it today, removed the throttle body and cleaned it out.
Removed the 2 injector coils, looked for any visible defects, marked them and them swapped them around.
Started the car, and no difference.
Car just randomly revving up and down.
Took it for a spin around the block, and this time the car actually stalled.
An oil pressure low message came on the dash.
Drove it home slowly,literally 30 seconds and tried the diagnostic system. No error codes to report.
I'll try take it to a mechanic on Monday but am dreading that its going to cost a fortune to fix.
Ive read about the recalibration on these engines, but does it have to be done via a software procedure ?
I left the car running for 15 minutes, would that not work.
Any suggestions I would be grateful.

I don't understand what you mean by the term "injector coils"?

Do you mean you swapped ignition coil leads around? If so then the leads can be just fine and the coils themselves still faulty. The car stalling could also indicate an ignition coil failure.



The

 

[varesecrazy]

Fuelling is controlled by the oil on these Motors

Get the oil strainer checked and cleaned, many garages don't check it!

 

[gidi19]

Fuelling is controlled by the oil on these Motors

Get the oil strainer checked and cleaned, many garages don't check it!

Hi,
Can you expand on this, whats an oil strainer?
Can you please explain where It is, and how easy it is to clean.
Ive tried goggling it, and its coming up as an oil filter ?
I want to try the easy fixes before I get mechanic to check on Monday.
Thanks

 

[gidi19]

I don't understand what you mean by the term "injector coils"?

Do you mean you swapped ignition coil leads around? If so then the leads can be just fine and the coils themselves still faulty. The car stalling could also indicate an ignition coil failure.



The

Hi yes,
I meant the ignition coils, not the injectors.

 

[AnthonyH]

You should test the throttle position sensor.

 

[gidi19]

Took the oil strainer out, cleaned it with carb cleaner. Put it back in. Car felt better. Drove without any misfires.
Once warmed to temp the problem came back again.
Its just revving by itself.
Any other things I can try ?
Still no dtc codes