Member
hello, i have a 1988 bmw e30 325i convertible. When i bought the car the catalytic converter was cut off. I knew this when i bought the car. my question is how does this affect the idling since i assume one of the 02 sensors was cut off as well. Is there something i need to do for example--deleting the 02 sensor? Not sure what question i should ask on this. I don't want to replace the catalytic converter if i don't have to. When i bought the car--i had only planned to use it for parts--but the engine and 5 speed trans seems very strong so i decided to refurbish it. When i bought it--it had no headlights, no cluster, no rear diff, and no catalytic converter and a few other small things missing. So far i have been able to replace all the missing part. thanks for any suggestions--mark
Member
The ECU will need the O2 sensor to manage the fuel mixture and is in the idle control circuit. But, it is mounted before the catalytic converter, so my GUESS is you can run without the cat.
2004 525i Sport, Manual - 1985 325E Coupe Manual
Wagon meister :)
BMW Tech Expert
+1
No cat needed as the European car's didn't come with them from the factory unless special ordered. If you don't have the bung left behind, just head over to a muffler/exhaust shop so they can just weld a bung in. I would have them put a cherry bomb or even a resonator to the pipe just to take up the space.
Darin
Current:
16 220i Active Tourer Platinsilver MET (C08)/Dakota Black (PDSW), P7ACA, P7LDA, P7LHA, P9BDA, 6sp Manual - Wife's new toy!
05 325it Electric Red(438)/Gray(N6TT) ZCW, ZSP 5sp Manual Back set cover, trunk mat, Euro Infra-Rot front windshield, and mud flaps! Mr. Wagon My new Winter car.
05 M3 Imolarot II(405)/Gray(N5TT) ZCW, ZPP 6sp Manual C.F. Lip, CSL diffuser, SSK, Euro Infra-Rot front windshield and a trunk liner! Mr. Go_Fast Stored for the Winter
Past:
95 318is Montreal Blue Met (297)/Beige(K1SN) RIP, killed by an Idiot.
84 M535i gray market Burgandy Rot Met/Black Leather Lowered by Intrax on bilies, poly everywhere, B&B cat back system, K&N, and a hitch! Da Beast - Still running w/400k+!
91 316i euro Tizianrot/Gray cloth - E-36 w/M-40 RIP, but great on gas! Best was 38 MPG
82 528i euro Saphire Blue Met/Blue Leather RIP
79 525 euro Green/Green RIP
79 318 Silver/Black - The first one that got it all started
M-Flight Member
Member
thanks for both replies. it still has an upstream sensor. Should i keep that or remove it? what about the downstream 02 sensor. since the Cat was cut off--i assume it is gone with the old Cat. Will this affect idle or is there a way to delete it totally remove it ? thanks
Member
what is a bung? muffler? thanks mark
Wagon meister :)
BMW Tech Expert
A bung is where the sensor screws into.
On that car, there is no downstream sensor, only upstream. It's a very basic system, and pretty easy to work on.
Darin
Current:
16 220i Active Tourer Platinsilver MET (C08)/Dakota Black (PDSW), P7ACA, P7LDA, P7LHA, P9BDA, 6sp Manual - Wife's new toy!
05 325it Electric Red(438)/Gray(N6TT) ZCW, ZSP 5sp Manual Back set cover, trunk mat, Euro Infra-Rot front windshield, and mud flaps! Mr. Wagon My new Winter car.
05 M3 Imolarot II(405)/Gray(N5TT) ZCW, ZPP 6sp Manual C.F. Lip, CSL diffuser, SSK, Euro Infra-Rot front windshield and a trunk liner! Mr. Go_Fast Stored for the Winter
Past:
95 318is Montreal Blue Met (297)/Beige(K1SN) RIP, killed by an Idiot.
84 M535i gray market Burgandy Rot Met/Black Leather Lowered by Intrax on bilies, poly everywhere, B&B cat back system, K&N, and a hitch! Da Beast - Still running w/400k+!
91 316i euro Tizianrot/Gray cloth - E-36 w/M-40 RIP, but great on gas! Best was 38 MPG
82 528i euro Saphire Blue Met/Blue Leather RIP
79 525 euro Green/Green RIP
79 318 Silver/Black - The first one that got it all started
M-Flight Member
Member
If the space where the cat was is “filled” with some type of piping and the 02 sensor is still intact, You should be okay to run it as is unless you have to pass emissions in your state.
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