lambda sensor

[savs]

Hey all.

I've got the engine fault code 17536 "engine running to lean". I've cleaned the MAF sensor with lots of IPA but therre is no difference to engine performance. I believe its now possibly the lambda sensor.

When i change this sensor and "IF" it solves the problem, will i notice a significant change in engine performance?? Just wondering. :confused:

[Crasher]

Year and engine code? Cleaning the AMM/MAF is about as much use as stroking it.

[savs]

Hi Crasher. Its a 2001 "Y plate" 1.8T. Not sure of the engine code? Is it in the logbook (AWT)?

Sounds like it was a bit of a waste sneaking the IPA out of work :o

[Crasher]

“17536 (P1128) Bank 1, mixture adaptation (mult.) system too lean” indicates (by mult.) that the problem occurs mainly during acceleration “17544 (P1136) Bank 1, mixture adaptation (add.) system too lean” would indicate that the problem only occurred at idle. There are various reasons for this fault code such as low fuel pressure, blocked injectors, an exhaust leak before the lambda sensor and an air leak in the Secondary Air Injection system but my money would be on a cracked crankcase ventilation hose or an air leak in the induction system after the AMM such as a split vacuum hose or inlet air boot. The crankcase breather system comes off of the block from the oil filter bracket to an angled hose and into a “T” piece and neither of these tend to split although I have seen it. From the “T” piece there is a small air hose that goes up to the inlet manifold and these are very common for splitting and if you don’t know what you are feeling for (they are difficult to see) then you may miss a split which tends to open up only under boost, hence the mult. fault code. The breather tube from the other side of the “T” piece is much larger and these often split under the covering (depending on the construction as it varies) and so can only be checked by removing them. The twisted “T” piece on the cam cover can split but the next pipe and then hose tend to be OK in my experience.

Off course it still could be a faulty AMM and if you buy a new one, buy one genuine and only from a VW dealer, no where else. You would not believe the stress and aggravation pattern AMM’s cause me, even from you know who.

[savs]

Cheers for that. I have wondered whether there is a leak, especially around the vacuum hoses. I've just replaced a vac hose that had a big hole in it. Although i've replaced this hose and cleared the fault log, the fault code returns after 50 - 100 miles. Usually on the motorway. There must be another leak still. I'll give all the hose's a close inspection this weekend and see if i can find anything.

The performance at the moment is definatly not what i believe it should be, but i'll see what i can find and keep the forum updated.

[savs]

“17536 (P1128) Bank 1, mixture adaptation (mult.) system too lean” indicates (by mult.) that the problem occurs mainly during acceleration

This is the fault code that keeps returning after being cleared. Usually after about 40mls. I've checked the hose's and i cant find another split one. I got the missus to keep holding the revs up at different ranges to see if i could hear or feel any splits but got nowt.

Is there any way of checking the MAF/AMM by checking the resistance at its socket to see if its o.k.? Could it be the lambda sensor? If so is there anyway to check that before buying a new one? :confused:

I'll check the hose's again though, just to be sure.

[Crasher]

Change the AMM first if you are sure there are no post AMM air leaks.

[savs]

Right then. This is a big thanks to crasher. After checking the secondary air system but not finding a leak ( as suggested by crasher) i went to the ******** and purchesed a new AMM (as suggested by crasher) which i immediatly placed on the car.

BBllliimmmeeeyyy. The car now works very, very well!! I am most impressed. Its a 1.8T and now pulls away like one. I've cleared the workshop light and its not come back so far!:biglaugh:

Now it drives like i believed it should. Nice one crasher and many thanks!

:beerchug: