Backfiring on decel with Remus - BMW Luxury Touring Community
 
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post #1 of 11 Old Oct 11th, 2011, 8:33 am Thread Starter
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Backfiring on decel with Remus

I recently replaced the OEM exhaust on my 2003 LT with 60K with a Remus Street Can due to the fact that the OEM had a hole that had rusted thru. I also inserted the pipe in the end to cut down on the drone. When I ride the twisties I always stay in low gear with high RPMs to take advantage of engine braking. Now I get a lot of popping and an occasional backfire when doing that. I changed to premium grade fuel and was considering a RhineWest chip thinking that would solve my problems. After doing a bit of searching on the forum it appears that the RhineWest chip won't really cure my issue. I don't mind spending the money if it will cure my issue but don't want to spend the money if I still have the issue. Any other ideas?
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post #2 of 11 Old Oct 11th, 2011, 10:17 am
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Re: Backfiring on decel with Remus

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Originally Posted by KayGee
I recently replaced the OEM exhaust on my 2003 LT with 60K with a Remus Street Can due to the fact that the OEM had a hole that had rusted thru. I also inserted the pipe in the end to cut down on the drone. When I ride the twisties I always stay in low gear with high RPMs to take advantage of engine braking. Now I get a lot of popping and an occasional backfire when doing that. I changed to premium grade fuel and was considering a RhineWest chip thinking that would solve my problems. After doing a bit of searching on the forum it appears that the RhineWest chip won't really cure my issue. I don't mind spending the money if it will cure my issue but don't want to spend the money if I still have the issue. Any other ideas?
Just a thought Keith but it sounds like your mixture has gone lean when was the last time the O2 sensor was changed?

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post #3 of 11 Old Oct 11th, 2011, 11:13 am Thread Starter
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Re: Backfiring on decel with Remus

Quote:
Originally Posted by Kra961
Just a thought Keith but it sounds like your mixture has gone lean when was the last time the O2 sensor was changed?



Are you refering to part #1?

Lambda Monitor sensor L=580MM 1 11781742051 $261.07

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post #4 of 11 Old Oct 11th, 2011, 11:29 am
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Re: Backfiring on decel with Remus

I don't know, I've got a 2000 with a remus and it backfires. Before and after a new o2 sensor...

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post #5 of 11 Old Oct 11th, 2011, 3:05 pm
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Re: Backfiring on decel with Remus

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Originally Posted by lartross
I don't know, I've got a 2000 with a remus and it backfires. Before and after a new o2 sensor...
+1... Well, she used to anyway... *sniff*sniff*

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post #6 of 11 Old Oct 11th, 2011, 3:22 pm
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Re: Backfiring on decel with Remus

My 99 with Remus and the chip does the same thing. Agree that it could be the O2 sensor.

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post #7 of 11 Old Oct 11th, 2011, 5:07 pm
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Re: Backfiring on decel with Remus

My '03 does that too with the Remus pipe.

You have an exhaust leak somewhere, probably where the muffler slips on the intermediate pipe.

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post #8 of 11 Old Oct 12th, 2011, 7:20 am
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Re: Backfiring on decel with Remus

My '03, with remus complete exhaust system, sometimes backfires, sometimes not.
On its third o2 sensor with no change.............

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post #9 of 11 Old Oct 12th, 2011, 9:16 am
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Re: Backfiring on decel with Remus

I have both the chip & exhaust on my '01 and it's a matter of how rapid the decel is, air temp etc. some times I get backfire, mostly not although I'm more gentle on the throttle let off except for urgent situations.

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post #10 of 11 Old Oct 12th, 2011, 9:17 am
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Re: Backfiring on decel with Remus

O2 sensor will cause it to run richer when it fails, gas mileage will really go bad, I know on the K100's when the throttle was fully closed the fuel injection was shut off until RPMs went below 1500, may be different with motronic, a more open exhaust on anything will usually result in snapping and cracking, less back pressure

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post #11 of 11 Old Oct 12th, 2011, 12:46 pm
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Re: Backfiring on decel with Remus

I have a 2000 with exhaust and chip and get some backfires as well. Much like BennyBob. Depends on the day, but I notice it normally happens when I downshift into a turn and hit high rpms with a big release of the throttle at the same time.

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