Hi.
Well i seem to have landed with a problem.
As many have read I fitted Denso IXU22 Iridium plugs fairly recently and up to now have been very pleased with the results.
Saturday we went on a 128 mile run, 90% motorway with 4 up. No problem at all with the exception after around 60 miles at lower speeds I noticed some suttering and jerking.
Yesterday I was out for 10 minutes and this was pretty bad (fine above 2500rpm), no management light or codes stored, that was using Afa OBD on my android phone. Even read my ECU data (programmed Jan 2014 software 0000 update 00)
I'm going to refit the old NGK's to eliminate the new plugs, i've also tested the leads and they all read between 190-250 ohms.
Any other ideas?

Hi.
Problem is still there with the old plugs cleaned and re-gapped to 0.9mm.

how did you clean your NGK spark plugs before refitting them?

jackwhoo said:

how did you clean your NGK spark plugs before refitting them?

Click to expand...

Proper copper plug wire brush then a fibreglass pencil.

Next will be to sniff each HT lead and look at the pulse from each on the scope. The tickover is lumpy too so I hope to see a discrepancy on one or more of the plugs.
If all looks OK then it could be fuel related or an ECU issue. I'll also check the MAF.

No work done today as it's poured with rain all day. Hopefully it'll stay dry enough for a look. I'm hoping to be armed with enough info if I don't find the issue when and if I need to go to the Fiat dealer.

Hi.
Early start today. I checked the quality of the pulse from each section of the coil pack by sniffing each HT lead with the scope, all 4 were perfect with very little difference in level. I then painted a line on the crank pulley for reference and connected up my old Zenon strobe to see if the timing was wandering about again all seemed fine with a normal advance occurring on increased revs. I'd already made up a breakout lead to check the injector waveforms. Again each pulse was a nice square wave with the M/S ratio changing along with its duration on different revs and blipping the throttle.
So I was mystified.
Then decided buggar it..... another set of standard NGK plugs. Just fitted them and went on a short run to find the problem has gone.
What I dont get is I have cleaned must be hundreds of plugs and re-gapped them and never had a problem, was it the copper brush or setting the gap back to 0.9mm who knows. I now realise these engines are really fussy in Euro 6 form, everything needs to be spot on.

Anyone want a set of Denso IXU22 Iridium for half price for their non Euro 6 Fire engined car let me know.

It was the wire brushing.

jackwhoo said:

It was the wire brushing.

Click to expand...

That did occur to me but that's why I use a fiberglass pencil after. It must be a very sensitive set up indeed. Oh well you live and learn.

Thanks for posting your result.
It should definitely help others.
Live and learn that is for sure.

Best Regards Jack

Certainly it looks as if Denso need to update their website as the IXU22 isn't that good in the Euro 6. Looking at the plug tip its much shorter than the NGK plug so on light throttle combustion could have been incomplete. Funny thing though above 2500 rpm on full throttle the engine is markedly quicker. Will see though later on how it feels on the motorway.
I didn't realize how interesting Panda ownership would be

Help

Hi.
Oddly the problem is back again. I have done an ECU scan and now there is a code coming up that tells me "Bank 1 heater inop" don't ask me the code number as I have forgot. and I'm locked up for the night.
I have looked through the handbook for the fuse but there is no reference to a Lambda heater fuse, odd as these are Ho2 types.
Anyone know the fuse location and number?

Re: Help

look in live data o2 sensor voltage and if its switching open and close loop. when cold

Re: Help

berzins42 said:

look in live data o2 sensor voltage and if its switching open and close loop. when cold

Click to expand...

Hi.
I actually started another thread about the issue as I thought the problem was the fuse for the oxygen sensor. Well there has been a lot of trials and tribulations since. A new set of standard plugs cleared the fault for a few miles as did other work. Looks as if the fault is intermittent. One positive find is oil on the MAP sensor and oil lying in the inlet tract seen with an endoscope camera. Just like every car the 1.2 has a closed breather system and oil will gradually build up until it can either be sucked up into the engine or contaminate the sensor. I'm fitting a catch tank next week. Cleaning the MAP sensor massively helps but the oily mess tends to come back at the moment. I actually think the upstream oxygen sensor is a bit weak as the live data swings are below what's expected. I think after the catch tank and oxygen sensor are fitted all will be ok.
I feel annoyed as at 20,000 miles I'd have trouble free motoring.

Re: Help

Hi.
As can be seen fuel consumption has suffered badly with this fault. With the £13 fill up and today added the figure is just above 35mpg so we do have a fault!!!
Off to Cramlington first thing and have no option of cancelling back on Monday afternoon and will see how the fuel consumption goes.