- Joined
- Feb 8, 2007
- Messages
- 20,650
- Location
- Portsmouth, Hampshire.
- Car
- E55K SL500 E250X2 Smart44 Brabus Track car E450Cabriolet X350 Pick up
Petrol. lol
Running lean, testing for air leaks
OK. So Merc codes 050 and 052.
Both have suggested causes:
MAF contaminated/under reading
Air leak
Fuel injector(s) worn/clogged
Diaphragm pressure regulator issue
The pressure regulator sits at the end of the fuel rail with a vacuum pipe hanging off it.
The vac pipe is to allow the regulator to maintain fuel rail (injector) pressure at the set level ABOVE the air pressure in the inlet manifold - so when you accelerate the vac line will pull and cause an increase in the fuel pressure to match.
Good idea to check the integrity of that vac line as a simple check - it could be the source of the air leak AND result in low fuel pressure.
Both have suggested causes:
MAF contaminated/under reading
Air leak
Fuel injector(s) worn/clogged
Diaphragm pressure regulator issue
The pressure regulator sits at the end of the fuel rail with a vacuum pipe hanging off it.
The vac pipe is to allow the regulator to maintain fuel rail (injector) pressure at the set level ABOVE the air pressure in the inlet manifold - so when you accelerate the vac line will pull and cause an increase in the fuel pressure to match.
Good idea to check the integrity of that vac line as a simple check - it could be the source of the air leak AND result in low fuel pressure.
Ok to update this thread, it took me ages to get hold of some Carb Cleaner because Halfrauds are just useless retards.
I sprayed it in turn, all over the air lines leading to the throttle body and the engine didnt behave any differently... so does this mean that the air leak could be somewhere else? or is there no air leak at all??
My next port of call i'm thinking would be the injectors themselves.... But aren't injectors meant to last the entire life of the car? or at least 100k miles for a un-looked after example?
I'm guessing the injectors are quite easy to remove and take to a specialist right?
I sprayed it in turn, all over the air lines leading to the throttle body and the engine didnt behave any differently... so does this mean that the air leak could be somewhere else? or is there no air leak at all??
My next port of call i'm thinking would be the injectors themselves.... But aren't injectors meant to last the entire life of the car? or at least 100k miles for a un-looked after example?
I'm guessing the injectors are quite easy to remove and take to a specialist right?
Laughing at your own jokes Olly!
Injectors came out of mine easy enough a few bolts hold the fuel rail on the rail is what clamps the injectors into the head, worth a bit of wd40 around the injectors where they go into the head as the o ring can be tight and hold the injector in.
Mine were tested as they were leaking fual after engine switched off and the guy said very very rare to get injector faults on mb.
Have you had a code reader plugged in to see live data? especially the lambda readouts it are they switching to slowly?
Lynall
Mine were tested as they were leaking fual after engine switched off and the guy said very very rare to get injector faults on mb.
Have you had a code reader plugged in to see live data? especially the lambda readouts it are they switching to slowly?
Lynall
Dieselman
Banned
- Joined
- Jul 13, 2003
- Messages
- 34,199
- Car
- Peugeot 403 Convertible
Seems fine or is fine. What are the output voltages when driving.?
Guess thats the next test i'm going to have to do... This is detailed very well in Gina's engine thread right...?
Dieselman
Banned
- Joined
- Jul 13, 2003
- Messages
- 34,199
- Car
- Peugeot 403 Convertible
Ha ha..LOL...Yep..! 
Update:
Tested the MAF and its reading about 1.8v on idle and 4.5v while driving which rises to about 4.6/4.7v on full chat.
And the codes still remain... but nothing has physically manifested itself as of yet.... (no misfires etc).
The only thing i can notice is that sometimes the car feels very lively, and other days it will feel extremely heavy, almost like its struggling. This was very apparent yesterday in the 28C heatwave that was in london!
Tested the MAF and its reading about 1.8v on idle and 4.5v while driving which rises to about 4.6/4.7v on full chat.
And the codes still remain... but nothing has physically manifested itself as of yet.... (no misfires etc).
The only thing i can notice is that sometimes the car feels very lively, and other days it will feel extremely heavy, almost like its struggling. This was very apparent yesterday in the 28C heatwave that was in london!
