Technical Serious Misfire and Poor Idling

[Jasonshirt]

I recently purchased a 2012 fiat 500 for the daughter and has been running well apart from a real rich strong smell of fuel. Done oil change, filter and air filter. Done 100k miles, last week the car started to make a real load banging and exhaust falpping noise whilst also idling really poorly. Obvious misfire.. I ran a Diagnostics and its showed P3010 P0300 P0302 P0303 P0301. When we checked the coil pack this looked brand new ie bolts still shiney chrome and leads looked ok. Similarly the plugs where all clean and dry apart from Cylinder 1 which was clean but was wet with fuel.
I purchased some Injector cleaner and ran that through but hasnt made a difference. Garage says change coil pack and plugs but this seems strange as they look newish? Could i be injectors and strange why Cylinder 4 not showing up as misfiring? Really looking for advice of what i can do before going to garage to diagnose and fix etc. ANy help appreciated. I have trawled the internet so appreciate this may be a repost but struggling to find someone with a similar story. Thanks

 

[steveras57]

I recently purchased a 2012 fiat 500 for the daughter and has been running well apart from a real rich strong smell of fuel. Done oil change, filter and air filter. Done 100k miles, last week the car started to make a real load banging and exhaust falpping noise whilst also idling really poorly. Obvious misfire.. I ran a Diagnostics and its showed P3010 P0300 P0302 P0303 P0301. When we checked the coil pack this looked brand new ie bolts still shiney chrome and leads looked ok. Similarly the plugs where all clean and dry apart from Cylinder 1 which was clean but was wet with fuel.
I purchased some Injector cleaner and ran that through but hasnt made a difference. Garage says change coil pack and plugs but this seems strange as they look newish? Could i be injectors and strange why Cylinder 4 not showing up as misfiring? Really looking for advice of what i can do before going to garage to diagnose and fix etc. ANy help appreciated. I have trawled the internet so appreciate this may be a repost but struggling to find someone with a similar story. Thanks

I had a very similar problem! firstly see if the throttle body needs cleaning ,then get a used set of injectors and put them on and see if they make any difference this cured my misfire issues! also try a new earthing strap from the negative battery terminal to the frame!
dont forget to clear the fault codes as well.
good luck!

 

[Jasonshirt]

I had a very similar problem! firstly see if the throttle body needs cleaning ,then get a used set of injectors and put them on and see if they make any difference this cured my misfire issues! also try a new earthing strap from the negative battery terminal to the frame!
dont forget to clear the fault codes as well.
good luck!

Assuming clear fault codes after resolution? Do this with removing battery negative and replacing.rev 4k 3 times ?

 

[John202020]

Timing? Ie timing belt.
Lambda?