rough idle and engine cut out when hot

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My Name: neilvs123

Member
Posts: 2
Joined: Tue Jan 07, 2020 12:34 pm
Model: C3 2002-2005, Original shape model
Year: 2002 (02)
Engine Size: 1.4 i
Fuel Type: Diesel
Mileage: 120000
Trim Level: VTR+
Gearbox: Manual 5 speed
DPF: No
LHD or RHD: RHD (UK)

Post

Hi there

I am desperate for a solution as nobody anywhere near me seems able to help (Ive been to French car mechanic and auto-electricians).

I have a Citroen C3 1.4 Hdi, when the engine is hot the idling "hick-cups" I think its called rough idling.; every few seconds it kind of skips a beat feels like its cutting out them resumes again. Now its starting to cut out completely while driving (never when idling only when driving).
The mechanic said it reads a fuel temperature sensor fault but when the sensor was replaced the problem persisted.
When hot the computer reads high temp then very low temp, cycling through this high to low; so its probably giving the wrong fuel mix.

Im now being told to buy a new ECU but that's ridiculously expensive.
Does anyone here have any experience with a similar problem, with a less expensive solution, please?

Cheers
Neil
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My Name: Arfur Dent

Guru
Posts: 3303
Joined: Sat Jul 23, 2011 3:47 pm
Model: C3 2002-2005, Original shape model
Year: 2002 (52)
Engine Size: 1.4 (16v)
Fuel Type: Diesel
Mileage: 100000
Trim Level: Exclusive
Gearbox: Manual 5 speed
DPF: No
LHD or RHD: RHD (UK)
Engine name: DV4 16-valve diesel (90 PS)
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Been thanked: 111 times

Post

Hi Neil
neilvs123 wrote: Tue Jan 07, 2020 12:55 pm Hi there

I am desperate for a solution as nobody anywhere near me seems able to help (Ive been to French car mechanic and auto-electricians).

I have a Citroen C3 1.4 Hdi, when the engine is hot the idling "hick-cups" I think its called rough idling.; every few seconds it kind of skips a beat feels like its cutting out them resumes again. Now its starting to cut out completely while driving (never when idling only when driving).
The mechanic said it reads a fuel temperature sensor fault but when the sensor was replaced the problem persisted.
When hot the computer reads high temp then very low temp, cycling through this high to low; so its probably giving the wrong fuel mix.

Im now being told to buy a new ECU but that's ridiculously expensive.
Does anyone here have any experience with a similar problem, with a less expensive solution, please?

Cheers
Neil

You have been to two specialists that have diagnosed it to a faulty ECU. This is the help you have paid for.

I can suggest some things to test, but they may have already been done and you are back to the ECU.

Obviously you wouldn't buy a NEW ECU for a very old car, and the solution for ECU faults on an old model is a second hand kit of ECU and matching BSM with the keys (here) for example. Obviously you need to double check the ECU model is matching what you have fitted. But this isn't pain free, and you need to configure the BSM with lexia and that is a job in itself.


The diagnosis is a bad signal to the ECU from the fuel temperature sensor.

I don't see a fuel temperature sensor on my parts list, do you know the part number of the sensor they changed?
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My Name: neilvs123

Member
Posts: 2
Joined: Tue Jan 07, 2020 12:34 pm
Model: C3 2002-2005, Original shape model
Year: 2002 (02)
Engine Size: 1.4 i
Fuel Type: Diesel
Mileage: 120000
Trim Level: VTR+
Gearbox: Manual 5 speed
DPF: No
LHD or RHD: RHD (UK)

Post

Hi

Thanks a million for your response.

I am actually in South Africa and the level of competence and even work ethic is far too often questionable. The mechanic I went to is still closed for the holidays so i cant get the part number just yet. I have found a company (1000km away) that reconditions ECUs, so i hope they will be able to assist.


Cheers man
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