mac119

Thanks for your investment, if you can make comparison, It will be great! All readings in VCDS, except strange 1 lambda and short & long fuel trims and little increased engine load look normally Tested with workshop-manuals I cleaned oil separator and PCV valve last month, also tested other one used and no difference. Even tested pipes and blocked up entry in airbox, still this same lambda readings. Ignition plugs and coils also new from 2020... Problems started in 2018 or 2019 with little "kangoo effect", but at beginning I didn't have time, tools and knowledge to overwhelm them. In this year was problem with cat and I bought cable for VCDS and want to diagnose my problem.

Hello all, I have problems with my engine BKY and mixture, ECU is Magneti Marelli 4TV, manual gearbox, without EGR. Symptoms: - high CO emissions, high HC (both idle and rised) and smells bad (previous owner has mounted emulator, so was without faults codes) - problems with rich mixture - wideband lambda 1 permanently between 0,42-0,45V - jumping short time fuel trim - in 10 sec idle even between -10% to 4% (all others logs I have seen are more stable) - empty long time fuel trims - checked many times in month - always empty... - sometimes "kangoo effect" when starts off - fast move, lost some power for 1 sec and next normally run - strange fuel consumption, once 8l for 100km, once 10l for 100km at those same roads. - 1 lambda probe period is 1.36s (block 034). I have read that should be less than 1s, but passes test in VCDS Facts: - 1 lambda is universal substitute NTK (cheaper than dedicated) changed 2 years ago because old had heater fault - no faults codes, checked also most ECU blocks with spec - engine load at idle shoud be 10-20%, in my car 22,5% Until now done: - replaced cat - universal substitute (not tested emission, but without errors and smells "good"), read 2 lambda is quite good, but not perfect (but cat shouldnt causing my problems) - cleaned and adapted throttle body - replaced EVAP, old had leaks in vaccum - tested vaccum leaks, changed most seals - tested piston compression (11,2 | 10,2 | 10,8 | 12 bar) - cleaned oil separator - basic injector test - no leaks, all have similar stream In plan: - testing fuel pressure All things I done in last 3 months, and still have problem with rich mixture, empty long time fuel trims, strange fuel consumption and sometimes "kangoo effect" - its dangerous expecially at juctions... I'm afraid that too rich mixture will kill my new cat and still is problem with emission. Why ECU dont have long time trims? Why short trims are extremely jumping at stable idle? Because of universal lambda probe? What should I also check or replace? Which logs can by helpful? I thought about exhaust leaks, but cant seen them (I can replace seal) and about engine tightness test (but compression is ok?). Please help me and give me any advices PS. Sorry for long story and my english in some parts, I'm not native.