Technical Fiat Cutting Out

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Technical Fiat Cutting Out

JackC1997

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So I’ve had a problem with my 1.2 Grande Punto for the last week. I initially took it to the garage last Friday as it seemed to stall and lose engine power when I was in stand still traffic. Whilst driving it also seemed to misfire/stall and as I was moving it kind of bump started itself. The electrics are all fine and everything turns on. I just have to hold the ignition for 10/15 seconds and it will start up again. I had a new alternator and timing belt in December and got a new battery last year also so it can’t be that.

When I went to the garage last week the run an engine diagnostics test and nothing showed up. They also took it for a 20 minute test drive and obviously it didn’t do it then.

All this week it hasn’t been right and has been doing the same thing cutting out and misfiring/stalling. Yesterday when driving it cut out and wouldn’t start up again like it had previously. I took it back to the garage today after managing to get it started and they said it was the relays, they have now changed them and it drove fine for 10/15 minutes to get back to work. I then parked up and sat still for 5 minutes and it cut out on me. When I tried to start it up it started fine and first time.

Does anybody know what this problem may be or had this previously?

Thanks,
 
Last edited:
So I’ve had a problem with my 1.2 Grande Punto for the last week. I initially took it to the garage last Friday as it seemed to stall and lose engine power when I was in stand still traffic. Whilst driving it also seemed to misfire/stall and as I was moving it kind of bump started itself. The electrics are all fine and everything turns on. I just have to hold the ignition for 10/15 seconds and it will start up again. I had a new alternator and timing belt in December and got a new battery last year also so it can’t be that.

When I went to the garage last week the run an engine diagnostics test and nothing showed up. They also took it for a 20 minute test drive and obviously it didn’t do it then.

All this week it hasn’t been right and has been doing the same thing cutting out and misfiring/stalling. Yesterday when driving it cut out and wouldn’t start up again like it had previously. I took it back to the garage today after managing to get it started and they said it was the relays, they have now changed them and it drove fine for 10/15 minutes to get back to work. I then parked up and sat still for 5 minutes and it cut out on me. When I tried to start it up it started fine and first time.

Does anybody know what this problem may be or had this previously?

Thanks,

Sounds like the crank sensor.
 
Would that be a 2 wire sensor? have heard that they can suffer from bad connections/corroded connection pins??

Hopwever i would have thought that a "bad" cranksensor would m,ake the mil light come and stay on and store a trouble code???
 
Would that be a 2 wire sensor? have heard that they can suffer from bad connections/corroded connection pins??

Hopwever i would have thought that a "bad" cranksensor would m,ake the mil light come and stay on and store a trouble code???

The sensor is almost ' stand alone'

The ECU just sees no hint of crank turning.. whether its actually rotating or not..

Charlie
 
The crankshaft sensor (K046) is the RPM sensor and also sees ( a missing tooth) when the engine is on TDC at the reference cylinder (usually #1 ).
The camshaft (timing) sensor sees which cylinder (1 or 4) is due to ignition (end of compression stroke) when the other detects the TDC. The ECU computes other cylinders position, and also RPM, using the number of teeth on the crankshaft pulley.
NB: the missing tooth on the crankshaft pulley does not necessarily need to be at TDC, it could very well correspond to all pistons at the same height (stroke angle). That would make more sense since the ignition (or injection) occurs BEFORE top dead center.

I know this doesn't answer your question but hey, a bit of theory sometimes helps ;-)

BRs, Bernie

If someone here helped You fix -or better, understand- your issue, hit the thanks icon @ bottom right corner, it's free and makes us feel helpy ;-)
 
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