Had to call RAC out....... - Page 4

klarzy · 31st May 2015, 17:35

Quote:

Originally Posted by Number 6

I think it is

I could never remember which... but knew it was one of the two...

FrenchMike · 31st May 2015, 17:46

Quote:

Originally Posted by klarzy-dials.com

I could never remember which... but knew it was one of the two...

Hi Peter,the cranksensor one is simply a coil so more robust and not temperature dependent ..

Nickymousecymru · 1st June 2015, 15:30

I had EXACTLY the same symptoms once where the car drove as usually to work but wouldn't start when I got out. Left the car at work that night ,returned in the morning and it started 1st time. Next couple of weeks the engine management light would flicker on and off...someone on here(forgive for forgetting who) suggested i check the plug at the top of the fuel filter assembly...i remove and refitted and not had a problem in 3 months...worth a try

Mike Noc · 3rd June 2015, 07:28

You are forgiven Nicky.

Simon, as mentioned best to either get the car on a diagnostic or do some checks yourself to find out exactly what is wrong.

If the engine starts and runs OK after a sniff of Easystart then carry out an injector leakback test. The engine driven high pressure fuel pump is only turning at 3/4 engine speed so when cranking, if there is a leaking injector, the fuel pressure in the common rail won't get high enough for the ECM to initiate the injectors firing. The Easystart speeds the engine up enough to overcome the pressure loss, and, once started, the pump can then cope.

If the cam sensor is faulty, no amount of Easystart will allow the engine to run. The ECM needs to check the initial cam position (as the cams rotate at half engine speed) at start up and then it ignores the cam sensor until the next start up. It knows that for every two turns of the crankshaft the camshafts will turn once so it uses just the crank sensor once the engine has started.

So a faulty crank sensor can give you problems after the engine has started but a faulty cam sensor can't. Also, although the cam sensors usually start to fail when warm, they can fail from cold - mine did.

simon.goode88 · 3rd June 2015, 15:18

Thanks for all the info everybody. Hopefully seeing Phil T4 the weekend to get it all checked out and get the 160 map put on it.

HarryM1BYT · 3rd June 2015, 16:23

Quote:

Originally Posted by Mike Noc

You are forgiven Nicky.

If the cam sensor is faulty, no amount of Easystart will allow the engine to run. The ECM needs to check the initial cam position (as the cams rotate at half engine speed) at start up and then it ignores the cam sensor until the next start up. It knows that for every two turns of the crankshaft the camshafts will turn once so it uses just the crank sensor once the engine has started.

So a faulty crank sensor can give you problems after the engine has started but a faulty cam sensor can't. Also, although the cam sensors usually start to fail when warm, they can fail from cold - mine did.

Doesn't the tacho needle bounce when cranking, if the cam sensor is good - remind me?

Mike Noc · 3rd June 2015, 17:17

Close but that's the test for the crank sensor Harry.

RodgerD · 3rd June 2015, 17:21

Quote:

Originally Posted by simon.goode88

Thanks for all the info everybody. Hopefully seeing Phil T4 the weekend to get it all checked out and get the 160 map put on it.

Good decision, will save scratch your head with a hit or miss approach to sorting your car out. BTW do you still have the 1.8T that needed work doing to the engine, or have you moved it on.

simon.goode88 · 3rd June 2015, 19:15

The 1.8t was stripped and scrapped today as ive got the diesel now and dont need the 1.8t. I swapped parts over from the 1.8t to the diesel. All i need are the boot struts and an engine cover

1st June 2015, 15:30	#33
Nickymousecymru Regular poster MG-ZT Join Date: Apr 2014 Location: Mountain Ash Posts: 93 Thanks: 48 Thanked 9 Times in 9 Posts	I had EXACTLY the same symptoms once where the car drove as usually to work but wouldn't start when I got out. Left the car at work that night ,returned in the morning and it started 1st time. Next couple of weeks the engine management light would flicker on and off...someone on here(forgive for forgetting who) suggested i check the plug at the top of the fuel filter assembly...i remove and refitted and not had a problem in 3 months...worth a try

3rd June 2015, 07:28	#34
Mike Noc This is my second home Rover 75 CDT Manual Connoisseur SE, Rover 75 CDT Automatic Connoisseur SE & a Freelander Td4. Join Date: Jul 2009 Location: Hampshire Posts: 11,580 Thanks: 3,470 Thanked 3,119 Times in 2,247 Posts	You are forgiven Nicky. Simon, as mentioned best to either get the car on a diagnostic or do some checks yourself to find out exactly what is wrong. If the engine starts and runs OK after a sniff of Easystart then carry out an injector leakback test. The engine driven high pressure fuel pump is only turning at 3/4 engine speed so when cranking, if there is a leaking injector, the fuel pressure in the common rail won't get high enough for the ECM to initiate the injectors firing. The Easystart speeds the engine up enough to overcome the pressure loss, and, once started, the pump can then cope. If the cam sensor is faulty, no amount of Easystart will allow the engine to run. The ECM needs to check the initial cam position (as the cams rotate at half engine speed) at start up and then it ignores the cam sensor until the next start up. It knows that for every two turns of the crankshaft the camshafts will turn once so it uses just the crank sensor once the engine has started. So a faulty crank sensor can give you problems after the engine has started but a faulty cam sensor can't. Also, although the cam sensors usually start to fail when warm, they can fail from cold - mine did.

3rd June 2015, 15:18	#35
simon.goode88 Regular poster Rover 75 Tourer Join Date: Apr 2015 Location: Hemel Hempstead Posts: 53 Thanks: 2 Thanked 0 Times in 0 Posts	Thanks for all the info everybody. Hopefully seeing Phil T4 the weekend to get it all checked out and get the 160 map put on it.

3rd June 2015, 17:17	#37
Mike Noc This is my second home Rover 75 CDT Manual Connoisseur SE, Rover 75 CDT Automatic Connoisseur SE & a Freelander Td4. Join Date: Jul 2009 Location: Hampshire Posts: 11,580 Thanks: 3,470 Thanked 3,119 Times in 2,247 Posts	Close but that's the test for the crank sensor Harry.

3rd June 2015, 19:15	#39
simon.goode88 Regular poster Rover 75 Tourer Join Date: Apr 2015 Location: Hemel Hempstead Posts: 53 Thanks: 2 Thanked 0 Times in 0 Posts	The 1.8t was stripped and scrapped today as ive got the diesel now and dont need the 1.8t. I swapped parts over from the 1.8t to the diesel. All i need are the boot struts and an engine cover