Technical Loss of power

[johnhalloway]

Hi Folks My Partner as an 2003 1.1 fiat seicento that is loseing power whilst we are traveling now this happens at different intervals
aswell as different weather conditions
also it will sometimes pick up the power again and as never cut out

we have already done
1. changed spark plugs and leads
ran a obd2 test which keeps reading cylinder 1 misfire detected
please all help would be greatful

 

[johnhalloway]

Hi Again can anybody tell me how to get to the fuel injectors as been told that they may need cleaning
the car in question is a 1.1 fiat seicento on a 03 plate

 

[fingers99]

It's unlikely to be the injectors. But download the Seicento Technical Manual (from the downloads section): it's all in there. If you swap injectors over, the misfire should follow the injector that was in #1 cylinder (closest to the timing belt).

Clear the fault and see.

I'd think it more likely to be the wiring to #1 that the injector (unless there is obvious damage).

 

[johnhalloway]

just been told it could be ignition coil or ecu any ideas folks

 

[fingers99]

It could be intervention by a committee of pixies.

On an 03 plate it's extremely unlikely to be the ECU (FIAT had replaced the evil micro ECU -- also found on the Mk2 Puntos -- with a much more robust one by then). Were it the coil, you'd expect a misfire on #4 as well (same coil fires 1 and 4), although internal breakdowns can cause this (rarely).

My money would be squarely on the plug or lead to #1

A simple test which may confirm is to remove the air filter housing and start the car at night with the bonnet open. Look for blue flashes. A blue flash indicates a high tension leak and the source of the problem. Spark plugs with cracked insulators (generally as a result of being dropped or installed with a socket without a rubber insert) or filthy coil pack HT exits can create the same effect.

 

[Pep0]

leprechauns

did you inspect plug insulators when you replaced?

add petrol injector cleaner to petrol tank or 50 mls of kerosene to full tank after a few days this removes petrol gum residue

id clean the face of the TDC sensor carefully as well remove the alternator drive pully wipe face of sensor with soft rag remember to put the pully back on the alignment pin

when was it last serviced and what was done?

 

[johnhalloway]

Thanks guys we done plugs and ht leads today will be first day car as been used so fingers crossed but the obd2 has said same code after we had replaced the plugs and leads any reason for this

 

[Pep0]

is there a clear the code button

 

[fingers99]

You do need to clear the code, or the fault will be held in memory.

Easiest (and best) way is to use the OBD reader to do it. Otherwise, disconnecting the battery negative for a minute or so will do it (but resets everything).