Z4m Exhaust Gas Smell
- Thread starter tshammas
- Start date
I had this when my O2 (lambda) sensors failed which then caused the catalytic converters to disintegrate.
I'd check the sensors even though no fault codes. I'd take it to a good mechanic and have them checked with a multimeter. And have a look at your catalytic converters too because sustained running with rich fuel will ruin them... When I unmounted them and shook them everything inside was in bits...
Best of luck and let us know!
I'd check the sensors even though no fault codes. I'd take it to a good mechanic and have them checked with a multimeter. And have a look at your catalytic converters too because sustained running with rich fuel will ruin them... When I unmounted them and shook them everything inside was in bits...
Best of luck and let us know!
Car has had a misfire in cylinder no. 5 and there is one of the o2 sensors that need to be replaced.
Now sine I bought the car a few months back I saw that the cats were removed and a straight pipe was fitted. Do I need to have the sensors In since there is no cat? I saw afe have a direct fit cat replacement option and another steel racing pipe and I'm not really sure what is best to do. Keep my existing g setup and replace the sensor or install one of the afe without any sensors??? Any advice please?
https://afepower.com/afe-power-47-46303-direct-fit-catalytic-converter-replacement
https://afepower.com/afe-power-48-36320-rn-twisted-steel-304-stainless-steel-race-pipe
Coil packs and tips already on order just to be on safe side.
Cheers for any advice
Now sine I bought the car a few months back I saw that the cats were removed and a straight pipe was fitted. Do I need to have the sensors In since there is no cat? I saw afe have a direct fit cat replacement option and another steel racing pipe and I'm not really sure what is best to do. Keep my existing g setup and replace the sensor or install one of the afe without any sensors??? Any advice please?
https://afepower.com/afe-power-47-46303-direct-fit-catalytic-converter-replacement
https://afepower.com/afe-power-48-36320-rn-twisted-steel-304-stainless-steel-race-pipe
Coil packs and tips already on order just to be on safe side.
Cheers for any advice
If you were running without catalytic converters then that might very well be contributing to why you smell unburnt fuel... and also if you ran without them and had no check-engine light on then i presume that your car must have a remap which codes the error out.
The sensors need to be able to read a value before and after the converters, if the value is the same (as in your setup without the catalytic converters) then they trigger the check-engine light. There are o2 sensor relocation kits which apparently retain the o2 sensors, don't trigger the fault code and don't need a remap but you need to research a bit because i dont have any personal experience with that and so i've not read up on it..
Hope this helps.
The sensors need to be able to read a value before and after the converters, if the value is the same (as in your setup without the catalytic converters) then they trigger the check-engine light. There are o2 sensor relocation kits which apparently retain the o2 sensors, don't trigger the fault code and don't need a remap but you need to research a bit because i dont have any personal experience with that and so i've not read up on it..
Hope this helps.
I guess i have my facts wrong, the relocation kits is for US Z4Ms which have an extra set of catalytic converters on the exhaust manifolds. If they replace them with the ones from the European Z4M's or with aftermarket ones then they need the relocation kit in order not to trigger a fault code. It's not for cat delete pipes....