Fuel injection problem?

P

pgodoe

Member
Hi!

First of all, I have a 1.4 petrol.

My A2 is acting kind of funny from time to time. Scenario:

If I'm driving steadily in lets say 60 mph on the highway, it sometimes feels like the car jumps between 75 bhp and 50 bhp every second: in other words,
It's like the pulling power increases and lowers every second. It is only noticeable when I'm driving steadily at high speeds.

My engine management as been on ever since I bought the car, and the only fault code is:

17559 - Long Term Fuel Trim Additive Air Bank 1: Range 1: System too Lean
P1151 - 35-00

Question is: could it be linked to my experience? I have given it a thought.

- Could it be bad connection to one of the four injectors (e.g. ignition comes and goes?). (The spark plugs are fine.)
- possibly a tired valve?

Some say it could be the oxygen sensor (lambda sensor), but in my mind it does not ad up, cause the shifting (between high power and low power) happens so fast, and I believe the lambda sensor operates at much longer time intervals.

Trying to save money and dont want to take the whole engine apart:)

Cheers

-P-
 
I'd say this sounds exactly like the lambda sensor. A failing lambda throws that fault code, and because the lambda controls fuelling, with a failing lambda you'll get a constant cycle of too much/too little fuel. The 1 second up/down surging sensation you get is also very typical of lambda adaptation.

It's a relatively cheap part , and straightforward to replace - certainly far less costly than pulling out valves!
 
Last edited:
Thanks! Problem is, the A2 has two oxygen sensors. the one in front (in the exhaust manifold) and the rear (located in the exhaust under the car).

Which one is in need of replacement?

-P-
 
The one at the front is living in far harsher conditions than the one at the rear - the exhaust temperatures are much higher and the gases more corrosive. I'd change that one first and see if it cures it.
 
Lambda probe (pre-cat)

Hi

I have had the pre-cat Lambda probe diagnosed as my fault. The car has started juddering when driving below 3000 rpm. The part has set me back £126 and I attempted to fit it myself this afternoon (in the work car park!) I removed the bolts holding the manifold heat shield on and managed to loosen the probe however couldn't get the plastic connector to come off of the metal bracket that it sits on.

Has anyone got any suggestions as to how I can get it off (apart from hitting it with a hammer!!)

Thanks.
 
Chris Steele said:
Hi

I have had the pre-cat Lambda probe diagnosed as my fault. The car has started juddering when driving below 3000 rpm. The part has set me back £126 and I attempted to fit it myself this afternoon (in the work car park!) I removed the bolts holding the manifold heat shield on and managed to loosen the probe however couldn't get the plastic connector to come off of the metal bracket that it sits on.

Has anyone got any suggestions as to how I can get it off (apart from hitting it with a hammer!!)

Thanks.
Click to expand...

Hi!
I have had a look at mine and I did not have to remove the shield. Anyways, the plastic connectors is a real pain. It is the same connection mechanism all over the car. I can't really explain how too loosen it, but have a go at one you can easily get to, and practice:) (push and pull mechanism) Maybe Spike has a better explanation:)

Cheers,

-P-
 
Hi. Thanks for the advice. I managed to get it off with a bit of brute force! The connector is tricksy to pull apart but did it in the end. Now I'm just hoping that the Engine Management Light goes off!!!!

Cheers.
 
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