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Twin coil pack - I've got a spare.
Edited by tujags on 01/01/2009 at 20:28
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If it has a distributor the most common fault was the vacum unit used to fail allowing air up the vacum pipe causing it to run weak & flat & causing fluctuations in the co readings.
If you remove the pipe the rpm should drop as the ignition retards about 10 degrees just at idle. If there is no difference when you remove the pipe the dizzy neds a new vacum unit.
If you have twin coils check the vac at idle, if its low check the cam timing & valve clearnces, they may of closed up giving you the symptoms discribed
i Doc
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Thanks Doc the mechanic checked the vacuum I remember that it was very erratic but I don't think it was particularly low but I will check it again if I don't freeze to death in the process!
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if the vacum was eratic that can be cause by a sticking valve ( unusual on these engines ) or broken valve spring or tight valve clearances! whilst idling i would expect 18-19hg steady at least, should be 19-21 text book stuff. Check manifold gaskets etc & is the exhaust system ok or could it be partially blocking. Also the lamda sensor is it a genuine or pattern one?if its pattern I would be wary
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Valve clearances are most suspect from your list Lambda sensor is Fiat exhaust is fairly new from end to end including the Cat - the old cat was clear I will check the engine, tappets etc, but standing outside for any time in present temperatures is not on my favoured options list!
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