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Discussion Starter #1
Hello everyone!


To replace - is the Crank shaft senor the same part number as the camshalf senor ie are they the same part that does both jobs ? ie if i brought a cam sensor would it work as a crank sensor

Richard
 

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Discussion Starter #5
Thank you !

no I'm not sure, have taken it to garage but they can find any faults as to why it has trouble starting after it has run for some time then left for an hour and then cranks over but does fire for a few times.

Lots of people are saying its either a crank or a cam shaft sensor , so im thinking i'll replace the cam first and if that does work i have the old one to replace the cam, as both senors do both .
 

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If either of those had a fault it would log a code and the EML light would come on. You really need to have the error log read to be sure, if you have a smart phone download the "torque App" and use a bluetooth adapter to connect to can-bus system. If the car runs fine at normal operating temperature for as long as you want to drive but just has difficulty re starting from hot, it isn't likely to be cam/crank sensor. Most likely is fuel/air/sparkplug systems, things easy to check are kinked pipes and cracks in pipes especially those on the vac side of the air ducting to the engine (manifold back to filter housing, if there are two small pipes going to the throttle body and they have been put back in the wrong order etc this can affect the mixture control. if you send me a pm with your e-mail I can send you some info in a pdf.
 

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I've had these type of faults without the ecu logging it, cam\crank sensors can and do break down under load another common fault on a lot of marques is the cts again it may not log a fault

I would say its the crank sensor from past experience on other cars
 

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mdvineng said:
It's always possible but I have rarely seen it only affect hot starting. Time will tell.
coming from Vauxhall and being around them for many years its ultra common

my friends v6 2.6 Vectra had a habit of not starting from hot after she spent 800 quid on it and not getting any closer we swapped out the crank sensor and its been fine since

the problem is they constantly hot and cold and get road spray and gunk thrown at them this weakens the sensor and makes the resin crack letting in moisture

if the ecu doesn't see the pulse from crank or cam sensor, the ecu cant work out the spark or the fuel - so it wont start

the same goes for the cts if the engine thinks its cold it will over fuel, to hot and it will under fuel it will also effect the spark by advancing or retarding the timing

ah the joys of modern engines and electronics



But then again I know nothing and don't pretend to either
 

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+1 for crank sensor

I ran Vauxhalls too, and The Other Car is a Suzuki. All suffered with crank sensor failure when hot and they don't log a fault code.
 

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until the Note I ran vectra's exclusively and had two crank sensors fail into limp mode and both times logged faults, the vauxhall ECU's also had a self reset facility, they would log a code but continue to work normally until a certian frequency of errors were detected then they would go in to limp mode and log a code into readable file location. There is another possibility in that one of the Lambda sensors is drifting out of spec and giving a rich mixture (lambda sensors have a wider error bandwidth than crank/cam sensors).
 

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Discussion Starter #12
Update:

It's not the Crank senor ! Bugger and the
sensor for the cram is different from the crank ( lots of listing under the same part
number , so make sure you buy the right one )

But I have found this little snippet :

""crank
sensor controls spark, cam sensor controls injection... your check engine light will not turn off when cranking(during a no
start) if you have no crank sensor signal, thats the easy way to tell..(this
can also be caused by immobilization, both the light and the no spark, however
youll have a code then, might not with the sensor) you will have fuel pressure if your cam sensor fails, just no
injection""�

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the cam and crank are both used for timing a bad reading from either and it will cause the engine not to start due to the lack of fuel and also spark as its all controlled by the ecu

a sensor breaking down under heat/load may not log a fault as it may only miss 1 or 2 pulses

I have only see it twice where both cam and crank have had intermittent faults

only true way find the problem is either swap the sensors or use a obd2 logger and go through all the data
 

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Discussion Starter #14
.....its not the Cam senor either and still no error codes or engine light . Hey in for a penny in for a pound , coolant temperature senor on its way ..
 

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do you have a unit that can read the values of the Lambda sensors? also check if any of the fuel pipes are routed differently than before the rad was changed i.e. nearer to heat source as a vapour lock when hot can cause these symptoms.
 

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Don't worry about the crankshaft sensor, where is my granddaughters dimple?


On the baby's knuckle, on the baby's knee Where will the baby's dimple be? Baby's cheek or baby's chin Seems to me it'll be a sin If it's always covered by the safety-pin Where will the dimple be ? :smile_big:


If you start singing with the words, your getting on a bit :smile_big:.
 

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Hello everyone!


To replace - is the Crank shaft senor the same part number as the camshalf senor ie are they the same part that does both jobs ? ie if i brought a cam sensor would it work as a crank sensor

Richard
On my Wife's 1.4 Petrol Note 59 plate they are 2 different parts, they look completely different also i fitted them very easy to do.
 
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