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Old 17th December 2020, 16:15   #1
Shuriken_57
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Default V6 2.5 auto hot start problem

Hello gentlemen, my 75 v6 2.5 is starting to have problems with hot start.
When I stop for 20 minutes to go shopping, I have trouble restarting.
I have to force the starter for a few seconds for the engine to start. Sometimes after two starts.
I changed the crankshaft sensor without success.
The battery is new.

What do you think?
The vehicle runs very well.
Thank you
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Old 17th December 2020, 16:32   #2
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If you are suffering from difficult starts i would also consider the Cam Sensor as a possible culprit.
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Old 17th December 2020, 20:53   #3
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If you are suffering from difficult starts i would also consider the Cam Sensor as a possible culprit.
Excuse me, I was wrong. I changed the sensor located near the engine oil filler cap: is this the camshaft sensor? I also have the crankshaft sensor that I haven’t changed because I don’t know where it is ( and I don’t know its usefulness).
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Old 17th December 2020, 22:17   #4
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A failing crank sensor will cause non starts and stalling .

A failing cam sensor will only cause non starts

The cam sensor on the V6 -190 is near the oil filler cap -see link below and scroll down

https://the75andztclub.co.uk/forum/s...=204883&page=2
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Old 17th December 2020, 22:24   #5
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So it sounds you have changed the cam sensor - so when she fails to start is the rev counter moving at all ?

If the rev counter (tachograph) is not moving when you try to start the car that points to a failing crank sensor which are known to fail when the engine is hot and start working again once cool.

Not sure where the crank sensor sits on the V6 -on mine its on the front bell housing but mine is a 1.8t

Failing hot is a classic sign of crank sensor starting to fail.
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She came off the Longbridge Line on 20-05-2003

The Silver Machine was the 13th of 160 Rover 75's to come off the production line that day and is the 100th of 527 Starlight Silver Rover 75 2.5 V6 Connoisseur SE Auto saloons listed in the build records produced world wide.
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Old 17th December 2020, 22:46   #6
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Thanks to poster Organiser ...
https://www.the75andztclub.co.uk/for...6&d=1414515924

Regards
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Old 18th December 2020, 08:12   #7
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Quote:
Originally Posted by Yorkshire GOC View Post
If the rev counter (tachograph) ...
Tachometer Martin. A tachograph is the device used in HGVs to monitor a driver's time at the wheel. They're so similar and easily confused.

Simon
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Old 18th December 2020, 09:48   #8
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True - that's why i think Rev Counter is more easily understood.
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Old 18th December 2020, 18:03   #9
Shuriken_57
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Quote:
Originally Posted by Yorkshire GOC View Post
So it sounds you have changed the cam sensor - so when she fails to start is the rev counter moving at all ?

If the rev counter (tachograph) is not moving when you try to start the car that points to a failing crank sensor which are known to fail when the engine is hot and start working again once cool.

Not sure where the crank sensor sits on the V6 -on mine its on the front bell housing but mine is a 1.8t

Failing hot is a classic sign of crank sensor starting to fail.
Hello, yes the rev counter moving.
The car start but i need to stay a few seconds on the starter.
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Old 19th December 2020, 11:09   #10
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Was the engine cold when you started her up ? A failing crank sensor stops working completely when hot - so best take her for a good spin to get the engine hot-stop somewhere convenient and then try to re-start - if she wont start and the rev counter remains still it points to the crank sensor.
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She came off the Longbridge Line on 20-05-2003

The Silver Machine was the 13th of 160 Rover 75's to come off the production line that day and is the 100th of 527 Starlight Silver Rover 75 2.5 V6 Connoisseur SE Auto saloons listed in the build records produced world wide.
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