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Technical 1.1 misfire.

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Technical 1.1 misfire.

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Nickhmh

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Does anyone know for a fact what causes the 1.1 misfire? I've read about it but not found a definite answer.
Mine does it occasionally. IE can drive perfectly for a while then it can start etc. Then the car runs fine again. Only seems to happen at 40+ mph now. And it doesn't go on for long IE just a couple of misses then it's fine again.
I believe it to be an ignition fault as it happens so quickly.
No fault codes are ever stored either.
Car is a 2010 1.1 with 107K miles with full service history and I'm the second owner.
If this issue is so common..do FIat know about it? Mebe they have a fix?
Thanks all:)
 
My 1.1 ECO Active had this issue during its first long journey after purchase.
I could of returned it to the garage to sort out under warranty, but thought I'd start to get to know my Panda.
I read as many posts about the issue on this forum as I could then took the plunge and started pulling the wireing harness covers from ECU down to the Y joint.
with the engine running, manipulating each wire (there are a lot) until a misfire was detected.
There are 2 wires joined together, the joining was poor so I cut and with fresh solder remade joint, I also found a damaged grey wire which I think was unrelated to the engine fault. I repaired it anyway.
With the engine running better I started putting everything back together, started the engine and it hesitated once again, manipulating the whole harness showed the engine running smoothly, then missing like a mad man.
I then thought about the plugs in the ECU, the plugs were in solidly but the receiver in the ECU could be moved while the plugs were connected, when moved the engine spluttered. AH HA I thought if I strapped the Plugs down, the straps would also hold the socket base in place.
4 long tie wraps later the plugs are in tight and the recievers can't move.
This has now worked for the last couple of thousand miles (not had the car long!)

Might be worth a try, wrap the Tie wraps around the plugs and ECU and pull them as tight as you can.
 
09 johno said:
My 1.1 ECO Active had this issue during its first long journey after purchase.
I could of returned it to the garage to sort out under warranty, but thought I'd start to get to know my Panda.
I read as many posts about the issue on this forum as I could then took the plunge and started pulling the wireing harness covers from ECU down to the Y joint.
with the engine running, manipulating each wire (there are a lot) until a misfire was detected.
There are 2 wires joined together, the joining was poor so I cut and with fresh solder remade joint, I also found a damaged grey wire which I think was unrelated to the engine fault. I repaired it anyway.
With the engine running better I started putting everything back together, started the engine and it hesitated once again, manipulating the whole harness showed the engine running smoothly, then missing like a mad man.
I then thought about the plugs in the ECU, the plugs were in solidly but the receiver in the ECU could be moved while the plugs were connected, when moved the engine spluttered. AH HA I thought if I strapped the Plugs down, the straps would also hold the socket base in place.
4 long tie wraps later the plugs are in tight and the recievers can't move.
This has now worked for the last couple of thousand miles (not had the car long!)

Might be worth a try, wrap the Tie wraps around the plugs and ECU and pull them as tight as you can.
Click to expand...
Thanks mate:)
 
Only happens over 40 doesn't sound like the wiring issue. Which is normally affected by the road surface.


There 101 reasons for a misfire.


Without logging some data while its failing we can only make wild guesses.



Only reving to a certain point then failing "could" be as simple as a crank sensor


We had on fuel pump on here in the last years also. Although I wouldn't expect that to clear itself.
 
Last edited:
A paid for version of MultiECUscan and an OBD2 connector with laptop will allow you to look at what's going on. Its amazingly good value and worth having if you only use it once.


There is also a free version but that probably wont do everything you need. Try it and see.
 
koalar said:
Only happens over 40 doesn't sound like the wiring issue. Which is normally affected by the road surface.


There 101 reasons for a misfire.


Without logging some data while its failing we can only make wild guesses.



Only reving to a certain point then failing "could" be as simple as a crank sensor


We had on fuel pump on here in the last years also. Although I wouldn't expect that to clear itself.
Click to expand...
It first happened after hitting a pot hole on the m6. I pulled into services and stopped.
She started up perfectly and ran great for a while.
I disconnected the battery then after 20 minutes both ecu plugs. Cleaned the connections with electric contact cleaner and left to dry. Everything was fine for about 2K miles.
It's started to happen again...occasionally...
Just annoying..
When I've time I'll get more involved with the issue.
 
You will have to examine the wiring bundles with a fine tooth comb. There might be some chafing or as others have said it could be a connector from multi-pin to single wire.
 
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