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(Post Link) post #1 of 3 Old 16-06-11 Thread Starter
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Alfa Romeo 147

Alfa 147 not starting


In the last couple of days my 2002 147 Luso Twin Spark has been starting up normally, but the car has vibrated a little once it has been started when stationery. It felt like it was need a replacement coil pack, but there have been no signs / faults on the ECU.

Two days ago the car was turning over, but would not start. I took it to a garage and replaced the spark plugs - which I was told where shot most likely due to flooding. Today, it is turning over (vibrating loads) but not actually starting.

I don't think a modern car would be this susceptible to flooding. When it drives it does not cut out so I am not sure if this would be the crank sensor. The battery has not been changed for some time - but I don't want to spend on this if it is not likely to be the battery at fault. The car normally works fine. Lastly, I have read of the Fuel Cut-off switch. I am not sure if this is a real possibility, but if so can this be reset?

It sounds like I can go to a mechanic and get up to 3 or 4 potential faults looked at without any real clue of the real problem. This hit and miss approach can prove very expensive.

Has anyone had this fault before and if so how did you resolve this? Can anyone help?
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I'm not sure if it is this, but this, sort of, happened to me but it was sudden on my old 155 v6.

The crank or cam sensors are prime suspect, but crank mainly. Get them tested manually, (old fashioned way - voltmeter and oscilloscope if required - the info is in the autodata CD's and books)

What happened to mine was it tested out ok by the ecu but the voltage dropped when being cranked - not a spark or fuel injected as the ecu has no idea where it is. So it does teh safest thing - nothing - it has no idea the engine is turning! It's about 4.2 volts or something ign on - but mine was dropping to 3 volts when cranked. New crank and cam sensors and it fired right up (this was 2 months after), literally, the starter turned the engine onto the 3rd compression and away she went.

Don't trust fault readers - just cos they say there's no fault doesn't mean there isn't one. Use them first then go old scool with voltmeters and probes - you will find the fault if you know how to look!

Hope that helps, just had to share as i know how it is when everyone looks bewildered and it's your car not working!

We have no plan, therefore nothing can go wrong (much)

And i Have finally put piccies of the silver one on!!
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(Post Link) post #3 of 3 Old 21-06-11 Thread Starter
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Alfa Romeo 147

Thanks James76,

Took the car to the garage and was told petrol was flooding the engine. Was told to change spark plugs. These were changed but car still felt odd and would not start from a cold start until several attempts. Took the car back and it was connected to a Diagnostic machine and it showed there was a fault with the coolant temperature sensor. I got that replaced and car drives, but has problems still with the cold starts.

It works fine once driven, but each time it starts up even if left for 2 hours it vibrates and sometimes just shuts down. Normally on 2nd or 3rd attempt with me pressing the gas it then eventually works.

Completely unreliable and unpredictable so I still welcome any clues. I will ask the mechanic to manually test the crank and cam sensors.

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