Hi all

 

Wondering if someone can give me some direction or reassurance I'm thinking the right thing. 

 

The car has a strange tendency to feel like it's misfiring at about 2.5k rpm when the car is warm. Although the engine does continue to re up the power just seems to fall flat at the 2.5k point. 

I did a test and when the engine is cold there is such flat spots or misfire. 

 

Hooked up the ODB11 tool and only engine code is P219600 02 sensor 1 bank 1 stuck rich. Which led me to think one of the injectors is going but when I checked the deviation on all 6 at idle they are all between 0.1-0.5 mg/stroke. So well within range. 

 

Then checked what the MAF sensor was actually reading compared to the specified value of air and at idle it matched roughly but at load the actual value was half of the specified value. 

 

Now my thinking is either a vacuum leak cashing the Egr to stay stuck closed at warm engine or a boost leak causing the incorrect fuel/air mix to go into the engine. I'm going to do a smoke test to find out it either of these are the problem, but if someone could suggest if this is the right thinking or if I should try something else first I'd very much appreciate it. 

 

Thanks all. 

3 hours ago, adsfisher said:

Hi all

 

Wondering if someone can give me some direction or reassurance I'm thinking the right thing. 

 

The car has a strange tendency to feel like it's misfiring at about 2.5k rpm when the car is warm. Although the engine does continue to re up the power just seems to fall flat at the 2.5k point. 

I did a test and when the engine is cold there is such flat spots or misfire. 

 

Hooked up the ODB11 tool and only engine code is P219600 02 sensor 1 bank 1 stuck rich. Which led me to think one of the injectors is going but when I checked the deviation on all 6 at idle they are all between 0.1-0.5 mg/stroke. So well within range. 

 

Then checked what the MAF sensor was actually reading compared to the specified value of air and at idle it matched roughly but at load the actual value was half of the specified value. 

 

Now my thinking is either a vacuum leak cashing the Egr to stay stuck closed at warm engine or a boost leak causing the incorrect fuel/air mix to go into the engine. I'm going to do a smoke test to find out it either of these are the problem, but if someone could suggest if this is the right thinking or if I should try something else first I'd very much appreciate it. 

 

Thanks all. 

 

Hi I would say the MAF is probably the root cause but its well documented that despite the belief that Audi parts last forever they actually don't, I found with a lot of them that when they reach a certain age/milage you end up replacing the MAP,MAF,DPF pressure sensor, they all communicate with each other and it only takes one to be on the way out and it throws it all out, personally my instinct would be to change the O2 sensor and the MAF and go from there its not the EGR sticking as that throws a whole host of codes that are related to that item, if you wok it out logically its a mixture problem yes but if the oxygen sensor is not getting the correct airflow strategy it will signal rich by default as commanded by the ECU therefore try the MAF first and then the O2.

Steve.