Help!

[Paul B]

Hi

 

Does anybody have any ideas on this fault code please? Any advice would be most appreciated, it's driving me mad!

 

17560 - Long Term Fuel Trim Additive Air Bank 1: Range 2: System too Lean

P1152 - 35-00 - -

 

The fault with the car has been juddering between about 1300 rpm and 2200 rpm, in Neutral and stationery. When you drive the car, the fault is amplified and seems to occasionally get really bad (when the car is fully loaded) and sometimes is less noticeable. The car has an LPG conversion (2 years old, 20K since) and up until this fault developed I have had no problems with it.

 

The Secondary Air Injection also seems to fire up occassionally on idle when the car is hot. Usually when I bring the revs down to stop at a junction. It doesn't do it all the time. Both these faults started around the same time, so must be linked.

 

So far I have paid 2 specialists to find this fault, both have failed and tell me there is nothing wrong the car! One suggests new engine mounts, but this wouldn't illuminate the engine light?

 

I have replaced the coil packs, pre-cat Lambda sensor, replaced the plugs 3 times and removed the inlet manifold to check for inductions leaks (not as bad as it looks) as well as compression checking each cylinder. Oh, and I've also changed the Electronic Throttle Body for another one, which made no difference either (was a real pig to work out how to get it to talk to the throttle pedal!). The engine is as quiet as ever with no knocks or rattles, uses no oil or water and is not using vast amounts of fuel either. It has loads of acceleration as it has always had.

 

The above fault code has only recently started to appear in the computer, so I'm guessing it has something to do with it! It appears that the engine is out of balance for some reason. Does this code suggest that 1 bank is weaker than the other? If so, surely this could well be my problem as the engine would run out of balance? If so, how do I rectify it please?

 

Has anyone had this and managed to cure it? It's a 2002 2.8 v6 Auto with 79K on the clock. Advice really appreciated as the car's going to be scrapped soon!! I'm getting fed up with it.

Edited July 23, 2009 by Paul B

[cyborg]

If you have checked all tubes for an air leak then

sounds like MAF sensor is on its way out ,giving out lots

of errors in it death throws.

[Paul B]

Thanks for that. I will have to consider trying another one on it. I really want to keep the car, have had it 5 years and am quite happy with it.

 

Could this weaken one bank and not the other do you think? "Specialists" had ruled out the MAF entirely and say if it goes, it just affects the whole lot! They have all remarked that it's working perfectly. Well, clearly something isn't.

 

I have tried to clean the MAF which makes no difference. When unplugged it runs no better, so I also had ruled it out. Obviously cleaning a dud MAF will make absolutely no difference, but I would suspect it to possibly run "better" when disconnected if this was the problem? I know that's the scenario I've read about on here with Diesels, but don't know if petrol is the same?

 

Paul

[cyborg]

After rereading the thread i noticed you mentioned secondary air injection cuts in it is possible that the air injection hose is on last legs and i forgot my golden rule of checking the basic stuff 'pipes. dammed beer makes me head fuzzy :unsure: . Anyway look at the pipe that puts secondary air injection into the head

 

here's a good explanation of it

 

 

http://forums.vwvortex.com/zerothread?id=1995162

[paul1976]

After rereading the thread i noticed you mentioned secondary air injection cuts in it is possible that the air injection hose is on last legs and i forgot my golden rule of checking the basic stuff 'pipes. dammed beer makes me head fuzzy :unsure: . Anyway look at the pipe that puts secondary air injection into the head

 

here's a good explanation of it

 

 

http://forums.vwvortex.com/zerothread?id=1995162

 

 

just a quick one for you to look in to on the back of the engine there is a valve pipe just under the manifold as that spilt because i had the same sort of problem on my 2.3 and it cost me