Hello guys,

One year ago i had two blown cylinders and had to redo the engine, it was a very hard and long process. I have changed everything in the engine from pistons to valves, all the sensors, new spark plugs and coils also the catalysts and the 4 lambda . After the engine was rebuild i have the following codes: P0171 / P0174 (System to lean Bank 1 and 2) and P0101 (Mass or volume airflow "A" Circuit Range/Performance).

I have since then replaced the MAF sensors and air intake filters on both sides, went to the dealership and done a smoke test and i have no leaks, changed also the PCV Valve.
The car starts rough (only at could start) and it revs from 1500-1700 RPM to 550 RPM, jumps like this for about 10 minutes until the engine is worm.
With the wormed up engine it starts perfect and revs at 650 RPM.
The car runs fine after the engine is worm displaying only a slight hesitation if i accelerate hard.
I also have the engine light on, which is normal.
You can also see in the printscreen the real time data at idle after i replaced the PVC Valve today.
The car is a Jaguar XKR 4.2 litre engine, year 2009.
I'm sorry if my grammar is not perfect, english is not my native language.

If you guys have any ideas where to look next i will be very grateful.

Thank you!

 

Welcome to the forums Andrei,

Your post was automatically locked for moderation and I have just seen it today. My apologies for the delay. I cannot see any problem with the content and have approved it. Other members will now see it and be able to reply.

Graham

 

check connectors to Throttle Position Sensor/ adjust if able.
look over entire air intake ducting for leaks after the MAF. (unmeasured air)
check connectors to all temp sensors. Your not getting proper cold start
enrichment signals. running lean during cold starts.

 

And once you've completed what @Night Hawk suggests, clear codes. reset the system by disconnecting battery, do NOT connect your code reader, reconnect battery, then restart engine.

 

Or do what guy said first its faster and easier, and just might fix it!

 

Good Luck @AndreiCiobanescu ! Keep us informed please.

 

Hello all,

The car it's at the dealership, they have done another smoke test, there were no leaks on the air intake but there were some on the camshaft cover on both banks so they replaced the gaskets on both sides and the cover on bank A (they said it's ). It's been tested for a week and i was called today to peak up the car, drove it for 3 km to the nearest gas station (it was on empty) and when i pulled out of the gas station the engine check light turned on again. Drove back to the dealership they retested the car and turns out it was the exact same codes.
I left the car there and i told them i am not gonna pay 1000 euro in parts and labour for the car to be in the exact same state.

I'm waiting for there call.
Thank you.