Technical Misfire cylinder 2.

[Barney Rubble]

I’m currently looking at an issue with a 2010 Panda 1.2. It has developed a misfire on cylinder 2. P0300 Misfire detection and P0302 Ignition malfunction cylinder 2. Using Autocom software.
The car has just been serviced by a garage who have replaced the spark plugs and HT leads. I have fitted a new coil pack and swapped the spark plug and HT lead to cylinder 3 and the misfire remains on cylinder 2. I have carried out a compression test, and all cylinders are 225 psi. Disconnecting injector 2 has no effect on the misfire at idle. I have connected my strobe light to each individual HT lead and they all fire at the same rate and intensity so pretty much ruling out an ignition/ecu fault. The connections all appear good and I have carried out a wiggle test on the wiring which doesn’t affect the idle. Coil charge times were all pretty equal but I can’t remember the exact figures and injector pulse was around 3 ms and all 4 were pretty equal, but again I can’t recall the exact number. Number 2 spark plug is always wet after a bit of running so I’m leaning towards an injector stuck open but it doesn’t show on the pulse width, that said would the ecu know if the injector was stuck open?
Anyway.. has anyone had the same issue?
Thanks in advance.

 

[koalar]

Instead of guessing

I'd just swap the injectors over

5 minute job

And you'll have answer

 

[Barney Rubble]

Thanks for the response.
That was on the to do list but I was concerned about damaging the ‘O’ rings on removal and leaving the car undriveable as they are using the car everyday. Maybe I’ll try and get a set of ‘O’ rings beforehand.

 

[MrMagoo]

My experience with misfires that it's not necessarily the sparkplug it's indicating.

 

[koalar]

If undoing the injector on cylinder 2 has no effect

The misfire has to be on cylinder 2

 

[Barney Rubble]

My experience with misfires that it's not necessarily the sparkplug it's indicating.

The misfire is without doubt cylinder 2 it’s just the cause that’s the issue. I’ve found a set of new injectors on eBay for around 35 quid whereas an O ring kit is 17 quid. Does anyone have any experience with these cheap eBay injectors?

 

[koalar]

The misfire is without doubt cylinder 2 it’s just the cause that’s the issue. I’ve found a set of new injectors on eBay for around 35 quid whereas an O ring kit is 17 quid. Does anyone have any experience with these cheap eBay injectors?

Don't

Spray pattern and flow rate are likely to be way out

O rings not needed

Done loads never had one fail, no guarantee, but odds are in your favour

 

[Barney Rubble]

Don't

Spray pattern and flow rate are likely to be way out

O rings not needed

Done loads never had one fail, no guarantee, but odds are in your favour

Okay, I’ll give it a go. Thanks for your help

 

[Barney Rubble]

I thought I’d wrap this thread up and give a bit of feedback. The fault was injector 2. Injector replaced and all is well. For now……

 

[koalar]

Cool

Not often we see a faulty injector on a petrol

There normally good for 200k plus

 

[Barney Rubble]

The nozzle was visibly dirty in comparison with the others. It may have responded to a clean but it’s got a new one now and runs like a dream.

 

[The Panda Nut]

With this new E10 I think some injector clener regularly may be a sensible precaution.