Change Crank as well as Cam Sensor?

boink · 26th October 2016, 09:21

Warm starting problems on Connie Diesel, so after reading up a bit on here I've concluded that there's a fair chance it's the Cam sensor (it's a particular issue getting car to start if I need to break a long journey or as happened last week at 2 in the morning, wife stalls it on an uphill junction driving back from Newcastle to Staffs).

I have taken the sensor off and it made a bit of a difference just cleaning it with WD40, so hoping the new one ordered yesterday from an MG Rover specialist supplier will do the trick.

Is it worth me changing Crank Sensor at same time? I've read differing opinions about this and given that car is fine when running, I'm leaning towards not bothering..especially as I can't locate it and can't find an actual picture of the thing in situ to help me. I'll post back later to say whether the Cam Sensor does the trick, If anyone has an opinion about changing the two parts I'd be grateful. If anyone knows a decent mechanic for Rovers in Stoke I'd be grateful too,

FrenchMike · 26th October 2016, 11:54

Before wasting time and money ,i would carry out an injector leakback test
(warm preferably)

Mike

Mike Noc · 26th October 2016, 12:38

If the engine runs fine once fired up then the crank sensor is doing it's job. Mine is still going strong at 380k miles so they can last.

boink · 26th October 2016, 15:21

Too late for French Mike's advice unfortunately. Bought the new cam sensor fitted, ran engine for 10-15 mins or so. Turned engine off then tried to restart. Fine. Turned off again and left for 5 mins before trying to start again. Not as good as I'd hoped but a definite improvement, with engine kicking in after a few seconds. I suppose it's possible that I could have one (or more) failing injectors as well as a failing camshaft sensor?

I'll have a look at the FAQ on injector leak-back testing and have a go at that tomorrow,

FrenchMike · 26th October 2016, 17:41

If the starting last more than half a second ....then ,there is something wrong

boink · 26th October 2016, 18:31

Update. Tried to start car an hours after my last post and would kick in at all. Just got her going again but after turning over for several seconds. So back to square one and looking for a culprit that isn't the cam sensor - which obviously isn't any better than the old one. New cam sensor's on ebay tomorrow.

More likely leakback from faulty injectors than faulty glowplugs?

COLVERT · 26th October 2016, 18:35

Won't be the Glow Plugs. The engine doesn't need them unless you are at the North Pole.---

boink · 26th October 2016, 18:55

Ta Colvert. That's something ruled out at least. I need the easiest version of a leakback/injector test there is now...or its off to the garage with my big maroon friend.

marinabrian · 26th October 2016, 19:00

Quote:

Originally Posted by boink

Ta Colvert. That's something ruled out at least. I need the easiest version of a leakback/injector test there is now...or its off to the garage with my big maroon friend.

This should be easy enough

LINK

Remember to clamp off the return pipe though

Brian

boink · 26th October 2016, 19:24

Thanks for this Brian. Really useful.

26th October 2016, 09:21	#1
boink Avid contributor Rover 75 Tourer Join Date: Aug 2015 Location: Stone Posts: 149 Thanks: 88 Thanked 11 Times in 8 Posts	Change Crank as well as Cam Sensor? Warm starting problems on Connie Diesel, so after reading up a bit on here I've concluded that there's a fair chance it's the Cam sensor (it's a particular issue getting car to start if I need to break a long journey or as happened last week at 2 in the morning, wife stalls it on an uphill junction driving back from Newcastle to Staffs). I have taken the sensor off and it made a bit of a difference just cleaning it with WD40, so hoping the new one ordered yesterday from an MG Rover specialist supplier will do the trick. Is it worth me changing Crank Sensor at same time? I've read differing opinions about this and given that car is fine when running, I'm leaning towards not bothering..especially as I can't locate it and can't find an actual picture of the thing in situ to help me. I'll post back later to say whether the Cam Sensor does the trick, If anyone has an opinion about changing the two parts I'd be grateful. If anyone knows a decent mechanic for Rovers in Stoke I'd be grateful too,

26th October 2016, 18:35	#7
COLVERT This is my second home R75 Saloon. Join Date: Feb 2009 Location: France/or Devon. Posts: 14,003 Thanks: 3,851 Thanked 2,167 Times in 1,816 Posts	Won't be the Glow Plugs. The engine doesn't need them unless you are at the North Pole.--- Last edited by COLVERT; 26th October 2016 at 19:51..

26th October 2016, 11:54	#2
FrenchMike This is my second home Rover 75 Saloon Join Date: Aug 2007 Location: Avignon Posts: 4,466 Thanks: 94 Thanked 661 Times in 554 Posts	Before wasting time and money ,i would carry out an injector leakback test (warm preferably) Mike

26th October 2016, 12:38	#3
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: 11,548 Thanks: 3,470 Thanked 3,119 Times in 2,247 Posts	If the engine runs fine once fired up then the crank sensor is doing it's job. Mine is still going strong at 380k miles so they can last.

26th October 2016, 15:21	#4
boink Avid contributor Rover 75 Tourer Join Date: Aug 2015 Location: Stone Posts: 149 Thanks: 88 Thanked 11 Times in 8 Posts	Too late for French Mike's advice unfortunately. Bought the new cam sensor fitted, ran engine for 10-15 mins or so. Turned engine off then tried to restart. Fine. Turned off again and left for 5 mins before trying to start again. Not as good as I'd hoped but a definite improvement, with engine kicking in after a few seconds. I suppose it's possible that I could have one (or more) failing injectors as well as a failing camshaft sensor? I'll have a look at the FAQ on injector leak-back testing and have a go at that tomorrow,

26th October 2016, 17:41	#5
FrenchMike This is my second home Rover 75 Saloon Join Date: Aug 2007 Location: Avignon Posts: 4,466 Thanks: 94 Thanked 661 Times in 554 Posts	If the starting last more than half a second ....then ,there is something wrong

26th October 2016, 18:31	#6
boink Avid contributor Rover 75 Tourer Join Date: Aug 2015 Location: Stone Posts: 149 Thanks: 88 Thanked 11 Times in 8 Posts	Update. Tried to start car an hours after my last post and would kick in at all. Just got her going again but after turning over for several seconds. So back to square one and looking for a culprit that isn't the cam sensor - which obviously isn't any better than the old one. New cam sensor's on ebay tomorrow. More likely leakback from faulty injectors than faulty glowplugs?

26th October 2016, 18:55	#8
boink Avid contributor Rover 75 Tourer Join Date: Aug 2015 Location: Stone Posts: 149 Thanks: 88 Thanked 11 Times in 8 Posts	Ta Colvert. That's something ruled out at least. I need the easiest version of a leakback/injector test there is now...or its off to the garage with my big maroon friend.

26th October 2016, 19:24	#10
boink Avid contributor Rover 75 Tourer Join Date: Aug 2015 Location: Stone Posts: 149 Thanks: 88 Thanked 11 Times in 8 Posts	Thanks for this Brian. Really useful.