NefMoto

Hi

I had a stage 2 tune done for my car last year and the car was going into limp with a boost limit exceeded fault, I changed the n75 which seemed to have stabilized the issue but under hard acceleration in 4th it would go into limp still, I reverted the flash back to stock and have been driving the car that way since.... since its not really a daily I havent really worried about it much.

Anyway decided to do some work on the car and fixed a slight oil leak it had and did some other maintenance and ran a vcds scan with the scan coming back with intermittent rich conditions on both banks and block 32 002/004 showing -14% on both so the car is obviously pulling fuel. I cant see/hear any obvious boost leaks and I did replace all the boost pressure hoses with silicone replacements last year.

Any thoughts on what to start looking at?

Logs from last year attached stock file and stage 2 (cant do any logging currently due to the chaos/riots going on here in SA currently)
 

log o2 voltages and ps_w

if you have access to a wideband try that.

but your wgdc is 95% up top which also points to a boost leak

pressure test.

will do a pressure test as soon as I can get out and get the stuff to build a new pressure tester

did pressure test, looks like leaky passenger side intercooler (rhd car)... going to see if I can get them recored.

ok so intercoolers repaired, everything assembled took the car for a drive, car is driving really strong but now I have a -9.4% partial on bank 1??? bank 2 is 0% where too from here?

injector issues or you still have a leak somewhere

Probably no pressure test was done.
Disconnect IC hoses, plug one, put 1 bar in the other.

Or waste your time chasing tails, your pick.

Yeah, likely the other one is leaking also. They often crack inside of the end tank seams, where you cannot really see it.
Of course a lot of other possibilities in these multi-problem vehicles.

Both intercoolers were done and pressure tested, what doesnt make any sense to me is if it was a boost leak I should be seeing high negative fuel trims on both banks not just one because the boost system is connected ie both turbos connect to a single point.

Probably lambda regulation is not even working on other side.
You pressure tested intercoolers off the car, not the entire intake system right?

So essentially you didn't test anything.

Why is this thread even continuing?
If you can't do a pressure test on the car, which literally takes 20 minutes on a lift, then maybe just stop doing this lol, it's pathetic.

Hi PRJ, intercoolers were pressure tested off the car by the radiator/intercooler repair place and I pressure tested the entire intake system once they were reinstalled.

I just HAD to register after reading this thread.
@ prj, slightly harsh comments? :D

as a follow up, i started having a oil smoke on deceleration issue which I initially thought was a leaky check valve but after pulling the intake manifold and doing some other stuff I found oil in the right hand side downpipe which ended up being the turbo. I had both turbos rebuilt and car is back up and running normally.

These cars don't make any boost at all if one turbo is blown, as air just recirculates through it.
I'd guess there was some issues with turbo inlet/outlet. Also the seating of air intake on this car is a nightmare.

It was boosting but leaking oil and the turbine/compressor wheels had both had damage from shaft play.

This does not significantly change fuel trim on a car with an air flow meter.