Diesel Cutting out under load

tony_fry · 9th March 2010, 07:14

My car seems to have a problem with it cutting out when I give it hard acceleration, but it restarts straight away, also I have a problem with warm stating, which might be down to the cam sensor? I don't know if both problems are related, can any one suggest anything?

Rolled1 · 9th March 2010, 10:32

The camsensor is only used on starting so once the car is up and running it cant affect driving performance,it may well be the cause of warm starting problems though.Cutting out under hard acceleration is a fuel supply issue,it could be 1 or more injectors giving problems,the ECU needs to see a certain pressure acheived from the injectors,if this pressure is not reached(through injector leakback for instance) then the ECU will instantly cut power to stop the very expensive high pressure fuel pump being damaged.As a first option it might be worthwhile adding injector cleaner to the fuel,it is usually just put into the tank but will work better and quicker if added directly into the fuel filter housing under the bonnet,take the car for a run afterwards and rev it hard in 3rd or 4th for anything up to a 1/2 mile,it may be a simple case of injectors being slightly clogged and this will clear it,otherwise check for injector leakback.Good luck

eddybrown · 9th March 2010, 18:02

It sounds like a fuel problem, I'd be tempted to suggest one of the fuel pumps may be faulty but as Rolled1 has said it could be injectors. Do a leakback test first to confirm.

Infact thinking about it you've said your having problems with starting, faulty injectors can cause this so I'd definately do a leakback test, have a search on the forums for it.

9th March 2010, 07:14	#1
tony_fry I really should get out more....... BMW I3 Join Date: Nov 2006 Location: South East London Posts: 2,224 Thanks: 31 Thanked 77 Times in 61 Posts	Diesel Cutting out under load My car seems to have a problem with it cutting out when I give it hard acceleration, but it restarts straight away, also I have a problem with warm stating, which might be down to the cam sensor? I don't know if both problems are related, can any one suggest anything? __________________ Regards Tony Membership No 135

9th March 2010, 18:02	#3
eddybrown Gets stuck in Rover 75 Club CDT & 73' MG Midget Join Date: Dec 2007 Location: Peterborough Posts: 543 Thanks: 0 Thanked 1 Time in 1 Post	It sounds like a fuel problem, I'd be tempted to suggest one of the fuel pumps may be faulty but as Rolled1 has said it could be injectors. Do a leakback test first to confirm. Infact thinking about it you've said your having problems with starting, faulty injectors can cause this so I'd definately do a leakback test, have a search on the forums for it. __________________ http://www.eddybrown.co.uk/images/userbar_ed.png http://www.eddybrown.co.uk/images/userbar_mg.png

9th March 2010, 10:32	#2
Rolled1 Avid contributor MG ZT CDTi+ Join Date: Nov 2009 Location: Donegal Posts: 206 Thanks: 0 Thanked 0 Times in 0 Posts	The camsensor is only used on starting so once the car is up and running it cant affect driving performance,it may well be the cause of warm starting problems though.Cutting out under hard acceleration is a fuel supply issue,it could be 1 or more injectors giving problems,the ECU needs to see a certain pressure acheived from the injectors,if this pressure is not reached(through injector leakback for instance) then the ECU will instantly cut power to stop the very expensive high pressure fuel pump being damaged.As a first option it might be worthwhile adding injector cleaner to the fuel,it is usually just put into the tank but will work better and quicker if added directly into the fuel filter housing under the bonnet,take the car for a run afterwards and rev it hard in 3rd or 4th for anything up to a 1/2 mile,it may be a simple case of injectors being slightly clogged and this will clear it,otherwise check for injector leakback.Good luck