CDti Poor starter Any ideas please?

bonnietiler · 4th August 2016, 19:16

I have owned the CDti for many years then my Son had it then it came back then My OTHER Son had then...etc etc..
Anyway it is an 03 CDTi with around 100k on it Just serviced by yours truly oil filter, fuel filter, etc
But it had become a tricky starter I cleaned all the gunge out of the valve at the front and replaced the Maf with a good second hand one but it persists in being a hard starter..Not all the time of course sometimes it fires up perfectly but when you're in a hurry and my Daughter in Law is a Midwife it can get all sulky and refuse to fire.
Any clues?
Kind Regards
Bonnietiler

Mike24 · 4th August 2016, 19:57

I would think a good place to start would be with an injector leak-back test. It seems that this problem is quite common and often results in difficult starting.

Mickyboy · 4th August 2016, 20:31

Cold starting/hot starting problem or both? All little details will help mate

bonnietiler · 4th August 2016, 21:30

It varies sometimes starts perfectly at others its a real pig, occasionally though it feels low on power immediately after starting then picks up after 10 seconds or so. I was thinking it might be the cam sensor?
Cheers
bonnietiler

Mickyboy · 5th August 2016, 05:36

Quote:

Originally Posted by bonnietiler

It varies sometimes starts perfectly at others its a real pig, occasionally though it feels low on power immediately after starting then picks up after 10 seconds or so. I was thinking it might be the cam sensor?
Cheers
bonnietiler

Cam sensor normally fails during hot starting, a way to tell is if it won't start when hot remove camsensor, pop it in the fridge for 10 mins, and then put it back on, if it starts first time bingo! Sounds more like leakback to me, what's the mileage ?? Have any injectors been replaced??
Unfortunately injector leakback seems very common on our cars, trust me I've lost count of the number of sets of injectors I've supplies in the last year alone.

marinabrian · 5th August 2016, 06:53

Since nobody has mentioned it, have you checked the plenum drains?

Brian

Kennyeth · 5th August 2016, 06:57

Or air in the fuel filter

Ken.

BigAde · 5th August 2016, 07:48

Personally I'd start with a decent injector cleaner.
I've just used this stuff to good effect - put it in the fuel filter, prime and run the engine for a minute before leaving it to soak overnight.
http://www.directcarparts.co.uk/work...ve-p1375/s1383

If you've still got the problem, look for injector leakback as Mickyboy quite rightly says.

Mike Noc · 5th August 2016, 08:13

Quote:

Originally Posted by bonnietiler

It varies sometimes starts perfectly at others its a real pig, occasionally though it feels low on power immediately after starting then picks up after 10 seconds or so. I was thinking it might be the cam sensor?
Cheers
bonnietiler

The cam sensor is only used as a reference for cam position at start up, so once the ECM knows the camshaft to crank timing it ignores the cam sensor signal until the next start up.

So the down on power for 10 seconds will be nothing to do with the cam sensor.

As mentioned they usually fail hot, but when mine went, the first time it wouldn't start was from cold.

4th August 2016, 19:16	#1
bonnietiler Avid contributor Rover 75 Tourer CDTi Join Date: Mar 2008 Location: stockport Posts: 100 Thanks: 0 Thanked 5 Times in 2 Posts	CDti Poor starter Any ideas please? I have owned the CDti for many years then my Son had it then it came back then My OTHER Son had then...etc etc.. Anyway it is an 03 CDTi with around 100k on it Just serviced by yours truly oil filter, fuel filter, etc But it had become a tricky starter I cleaned all the gunge out of the valve at the front and replaced the Maf with a good second hand one but it persists in being a hard starter..Not all the time of course sometimes it fires up perfectly but when you're in a hurry and my Daughter in Law is a Midwife it can get all sulky and refuse to fire. Any clues? Kind Regards Bonnietiler

4th August 2016, 20:31	#3
Mickyboy This is my second home MG ZT CDTI 135 + & MGZT CDTI AUTO 160 & ROVER 75 TOURER CDTI 160 TROPHY YELLOW Join Date: Aug 2013 Location: Hernebay Posts: 4,331 Thanks: 818 Thanked 2,414 Times in 1,141 Posts	Cold starting/hot starting problem or both? All little details will help mate __________________ [SIGPIC][/SIGPIC] T4 Owner Jobs done : new UBP, Spy hole mod, Rear hub(wheel bearing),plenum cleaned and emptied, Inline thermostat fitted,Full service, In car Digital tv/DVD Bluetooth Satnav etc, Replaced UBP, Restored headlights,Fixed airbag connection.replaced HP pump,replaced rear light seals,changed intercooler O rings. Jobs to do: ,replace drivers lock,.[/SIZE]

4th August 2016, 19:57	#2
Mike24 Loves to post Rover 75 CDTI Auto Saloon Connoisseur SE Join Date: Apr 2015 Location: Coventry Posts: 358 Thanks: 166 Thanked 67 Times in 56 Posts	I would think a good place to start would be with an injector leak-back test. It seems that this problem is quite common and often results in difficult starting.

4th August 2016, 21:30	#4
bonnietiler Avid contributor Rover 75 Tourer CDTi Join Date: Mar 2008 Location: stockport Posts: 100 Thanks: 0 Thanked 5 Times in 2 Posts	It varies sometimes starts perfectly at others its a real pig, occasionally though it feels low on power immediately after starting then picks up after 10 seconds or so. I was thinking it might be the cam sensor? Cheers bonnietiler

5th August 2016, 06:53	#6
marinabrian MG ZT Join Date: Jan 2011 Location: Newcastle Upon Tyne Posts: 20,151 Thanks: 3,565 Thanked 10,837 Times in 5,718 Posts	Since nobody has mentioned it, have you checked the plenum drains? Brian

5th August 2016, 06:57	#7
Kennyeth This is my second home No more Rover Join Date: Apr 2009 Location: Barnsley, South Yorkshire. Posts: 5,881 Thanks: 1,625 Thanked 1,308 Times in 998 Posts	Or air in the fuel filter Ken.

5th August 2016, 07:48	#8
BigAde Posted a thing or two MG ZT-T+ 135 CDTi Join Date: Oct 2012 Location: Sussex Posts: 1,502 Thanks: 511 Thanked 224 Times in 178 Posts	Personally I'd start with a decent injector cleaner. I've just used this stuff to good effect - put it in the fuel filter, prime and run the engine for a minute before leaving it to soak overnight. http://www.directcarparts.co.uk/work...ve-p1375/s1383 If you've still got the problem, look for injector leakback as Mickyboy quite rightly says.