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Old 02-05-2005   #1
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Question Won't start when warm

Its a long shot, but I was hoping someone maybe be able to help me with this problem.

I own a HGT Bravo (posting on here as the Haynes has no info on the engine or wiring), which starts fine from cold, but won't when hot.

If i start the car when cold, it will run fine, even when upto temp, but if i get stuck in traffic or let it idle after about 2 mins it will cut out. I then cannot start the engine until it reaches the first dot on the temp gauge above cold.

Just wondered if anyone has experienced the same problem and can shed some light on it.

I have got it booked in for a diag. at Fiat, but as usual there is a wait (17th May) and i really want to get it sorted asap.

Thanks

Daz
(Big Bad Mod, from Fiatboo.co.uk)
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Old 02-05-2005   #2
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Re: Won't start when warm

Daz

sounds serious it could be a fault wid your temp sender most new cars have a cut out on them if they get too warm there for not allowing you to cook the head. not sure if the bravo runs this system try putting a new stat or disconnect the sender unit on the side of the stat housing under the resonance box on the left hand side of the block.

Chris
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Old 02-05-2005   #3
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Re: Won't start when warm

When you say you can't start the car, do you mean that it turns over but won't fire? I'm struggling on this one. Not heard of CL22's diagnosis before, but you can have a look at http://server.hmallett.co.uk/Coupe/ (not 56k friendly) for more info on the engine management.
The only thing I can think of is phase sensor failure. I believe this is used during the starting of the car, and it can fail when hot. Don't think it would make a running engine cut out though.
If the car won't turn over, I've heard of coops with starter motor solenoids that break when hot. Again this wouldn't make a running car cut out though.

H
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Old 02-05-2005   #4
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Re: Won't start when warm

Quote Originally Posted by cl22
try putting a new stat or disconnect the sender unit on the side of the stat housing under the resonance box on the left hand side of the block.
You mean under the knock sensor? Don't know how cramped the engine bay is, but good luck with that!
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Old 03-05-2005   #5
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Re: Won't start when warm

Thanks for the link, i will have a good look through it when i get home...

...and have a look at what you guys suggested as soon as i can.

I was thinking of the temp sensor, but have no idea where it is located...(I was told it may be controlled by the ECU)

When the car is hot, it fires, then dies in approx 1 second.

Daz
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Old 06-05-2005   #6
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Re: Won't start when warm

Do you mean the coolant sensor? I have a feeling that if that is faulty, it can give a reading equivalent to -40 deg C, which stops the car from running. This sensor is next to the thermostat, which you should find on the right of the engine. Don't know how easy it is to get to on yours, but on the 20VT coop it's a bit of a pain.
If you mean the air temp sender, it's part of the air flow meter assembly.
H
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