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Old 2 Weeks Ago   #1
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Twin air

Hi everyone I'm still trying to sort the wife's 500 twin air issue. Rough idle sounds like it's on 1.1/2 cylinders and a small misfire.

Fitted new plugs today checked all the Ecu and plugs looms out.

Does anyone know what make coil packs they should have?
It has 2 Bosch ones fitted and 1 looks newer than the other
Has anyone else had this issue. No warning light on.
Thanks in advance
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Old 2 Weeks Ago   #2
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Re: Twin air

Have you plugged it in to any sort of diagnostics?
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Old 2 Weeks Ago   #3
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Re: Twin air

Coils are a known failure on earlier twins so a good place to start
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Old 2 Weeks Ago   #4
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Re: Twin air

What are the symptoms of them? Complete misfire or can they just have them run rough?
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Old 2 Weeks Ago   #5
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Re: Twin air

Right I've had it plugged in on a tool.
Oil temp plausible fault code?
Any ideas? I'm starting to worry now
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Old 2 Weeks Ago   #6
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Re: Twin air

Quote Originally Posted by 500virgin View Post
Right I've had it plugged in on a tool.
Oil temp plausible fault code?
Any ideas? I'm starting to worry now
What was the fault? out of range/no signal? if it constantly said hot that may cause issues when cold say, if it was totally faulty the ecu would use factory settings.
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Old 2 Weeks Ago   #7
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Re: Twin air

I'm going to do oil and filter change tomorrow. And get a sensor. I've been looking for stuff and found a guide on the Alfa page.

It just said plausible? Wife got it done by a freind with a snap on scanner.

If that fails to fix the problem it will set on fire
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Old 2 Weeks Ago   #8
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Re: Twin air

Well it's still hunting

Worse when cold

Temp sensor checks out

Oil temp sensor checks out on resistance.

Cleared Ecu and will run like a sack of salt and won't put up the eml light
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Old 2 Weeks Ago   #9
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Re: Twin air

This may be a silly question but what are you comparing engine sound too?
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Old 2 Weeks Ago   #10
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Re: Twin air

It idles fine... then it runs lumpy and coughs and almost stalls

I've been told the sound like lawn mowers on start up?

I'm sure I have a coil pack breaking down. But checked resistance and both are the same..
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Old 2 Weeks Ago   #11
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Re: Twin air

The only thing you can compare it to is another twin air.
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Old 2 Weeks Ago   #12
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Re: Twin air

If it's not throwing a misfire code the misfire threshold must be very high .
Does it drive ok on open road under heavy load?
The more air and fuel there is in the cylinder the higher the voltage has to be at spark plug. Coil breakdown would be more obvious under these conditions.

Recommend getting a lead and trying MES it's very good.
What code reader are you currently using?
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Old 2 Weeks Ago   #13
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Re: Twin air

Drives ok but does cough.. but when you come to a stop it wants to stall?
gonna buy a coil pack tomorrow to try and rule it out.
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Old 2 Weeks Ago   #14
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Re: Twin air

54% off at Gsf this weekend
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Old 2 Weeks Ago   #15
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Re: Twin air

Sweet I'll see if they have 1
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