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Technical 2005 Panda - Coolant temp sensor changed three times, intermittent long crank

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Technical 2005 Panda - Coolant temp sensor changed three times, intermittent long crank

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Nimmini

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I have a 2005 1.4 Fiat Panda with intermittent long cranking problems. I've had the coolant temp sensor changed three times from three different part suppliers just in case the part was faulty - every time after it's been replaced, the car is great for about 3 - 4 weeks then returns back to an intermittent long crank when trying to start the car. There were no codes stored but the diagnostics were showing that the coolant temperature would start to rise then drop even though the fan hadn't kicked in. It would then rise again and rise further and only then would the fan kick in and start to show the regular readings that it should. The car drives fine otherwise.

Does anyone have a clue what else might need looking at? The throttle body has been cleaned and the battery is only a year old - I don't want to go back to the dealer as the last time I had to go to them, they said they'd replaced a sensor and hadn't and even then they diagnosed the wrong sensor which another mechanic identified straight away and replaced (knock sensor)!

Thanks in advance for your help - hope I haven't repeated a topic but I couldn't find another similar topic :)
 
Nimmini said:
I have a 2005 1.4 Fiat Panda with intermittent long cranking problems. The car drives fine otherwise.

Does anyone have a clue what else might need looking at? The throttle body has been cleaned and the battery is only a year old - I don't want to go back to the dealer as the last time I had to go to them, they said they'd replaced a sensor and hadn't and even then they diagnosed the wrong sensor which another mechanic identified straight away and replaced (knock sensor)!

:)
Click to expand...

Hi,
is yours a 100HP..??, :confused:
as the problems sound "out-of-the-ordinary" for the 1.1/1.2 engines,

I would've thought a CrankAngleSensor would have been a prime suspect,
as they cause poor starting AND don't leave an error code, :mad:

where are you based ?,
as it sounds as if you NEED a recommendation of a garage who actually KNOWS what they are doing..,
charlie - Oxford
 
It could be a fractured coolant temperature sensor signal cable which interrmittently disconnects flagging the error in the ECU. Fiat will probably want to change the engine wiring loom (£££) if they suspect a cable fault. An independent auto electrician might be your best bet as they will be able to check and repair it cost effectively.
 
lamlash said:
It could be a fractured coolant temperature sensor signal cable which interrmittently disconnects flagging the error in the ECU. QUOTE]

i had thought similar..having seen similar on a FORD years ago.., :mad:

however - any decent garage would have used an exhaust gas analyser to see a rise in emissions corresponding with the spikes of TEMP fluctuation,
as the vehicle effectively( puts on the choke) and over-fuels itself into a misfire ( non-starting) condition ,


PS- i don't think it records an actual error CODE.. :bang:


Charlie
Click to expand...
 
I had a headache like this with a 16v Scenic.

It appears 16v's like to know the camshaft positions when cold starting, something it took me a while to figure as I choose to ingore this and chase other sensors.

Basically it couldn't quite time the spark from cold until the engine was spinning fast enough.

BTW, the rise, fall and rise of the temp sensor is normal from a cold start.
After starting the coolant around the engine jacket start to heat.
Until it's hot enough to open the thermostat, then cold coolant suddenly enters the system dropping the reading slightly.
Then as this cold coolant starts to warm up, the readings rise again until it evens out via air flowing over the rad (driving/fans)
 
Last edited:
Goudrons said:
I had a headache like this with a 16v Scenic.

It appears 16v's like to know the camshaft positions when cold starting, something it took me a while to figure as I choose to ingore this and chase other sensors.

Basically it couldn't quite time the spark from cold until the engine was spinning fast enough.

BTW, the rise, fall and rise of the temp sensor is normal from a cold start.
After starting the coolant around the engine jacket start to heat.
Until it's hot enough to open the thermostat, then cold coolant suddenly enters the system dropping the reading slightly.
Then as this cold coolant starts to warm up, the readings rise again until it evens out via air flowing over the rad (driving/fans)
Click to expand...


it would be good to know exactly what spec of engine this vehicle has, EDIT - original post in August says 1.2,

does sound as if something may not be communcating with the ECU.. BUT the CAS is still an easy / cheap option in my book,
(also suggested in AUG - no idea if it's been done)
charlie
 
Last edited:
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