Leakback Test

tony_fry · 16th October 2008, 19:36

I have a problem with my car cutting out after a run, it start idling very bad, (between 5000 and 8000 rpm on the speedo) and if I take it out of gear (Automatic) and then put it reverse the engine cuts out, but then straight away. This does not happen all the time.

Can any point me in the right direct on the "How To" do a leak test, I have done a search and there's bit and pieces on a few threads, but not a complete guide.

Many Thanks
Tony

sworks · 16th October 2008, 20:21

remove the leak back pipes from the injectors and clamp off, attatch pipes to the injector leak back port (all four pipes must be the same length) and have them going into four measuring vessels. Crank / start engine and watch for fuel to fill the bottles. This can be either slow or quite quick so be ready to switch the car off - if slow run for about 30 seconds and compare the amount of fuel. You are allowed approx 10% difference but each manufacturer quotes slightly different. You are looking for excessive amounts compared against all 4. Usual health and safety rules apply. If you can't make up the kit it shouldn't cost more than an hour at a garage

tony_fry · 17th October 2008, 06:20

Many Thanks for the prompt reply.

16th October 2008, 19:36	#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	Leakback Test I have a problem with my car cutting out after a run, it start idling very bad, (between 5000 and 8000 rpm on the speedo) and if I take it out of gear (Automatic) and then put it reverse the engine cuts out, but then straight away. This does not happen all the time. Can any point me in the right direct on the "How To" do a leak test, I have done a search and there's bit and pieces on a few threads, but not a complete guide. Many Thanks Tony

16th October 2008, 20:21	#2
sworks Been absent for a while… Rover 75 Tourer, Classic mini Cooper S, Abarth 595 competizione, MG TF and a Hyundai Tucson PHEV Join Date: Feb 2007 Location: Cumbria Posts: 13,065 Thanks: 1,033 Thanked 1,686 Times in 1,040 Posts	remove the leak back pipes from the injectors and clamp off, attatch pipes to the injector leak back port (all four pipes must be the same length) and have them going into four measuring vessels. Crank / start engine and watch for fuel to fill the bottles. This can be either slow or quite quick so be ready to switch the car off - if slow run for about 30 seconds and compare the amount of fuel. You are allowed approx 10% difference but each manufacturer quotes slightly different. You are looking for excessive amounts compared against all 4. Usual health and safety rules apply. If you can't make up the kit it shouldn't cost more than an hour at a garage

17th October 2008, 06:20	#3
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	Many Thanks for the prompt reply.