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Re: Backfiring 733i (archive)
[ Follow Ups ] [ 7-series (E23) Message Board ] [ Msg. Board FAQ ]
Posted by Boomer on July 07, 2001 at 23:00:06:

In Reply to: Re: Backfiring 733i posted by Walter OH 84/733i 87/325i 83/635csi Euro on July 07, 2001 at 21:50:47:


Backfire in the exhaust is much more rare than it used to be in the pre catalyst days - The cat should burn the unburned fuel an avoid combustion in the exhaust system. Backfire is most typical of lean misfire (but can also occur with rich misfire), the engine begins to misfire and the misfires dump unburned fuel into the exhaust - an exhaust leak can promote combustion in the exhaust by supplying additional air.

I would think that injectors, air flow meter, plugs, cap and wires would be good places to start. If you have the 5 series Benleys - I'd do the Motronic 35 pin check to see what info the brain is getting.

My 83 733i sounds like it is backfiring. I only hear it after acceleration and I'm beginning to slow down.I had new muffler installed from converter back in February 2000. What kind I troubleshoot to find this problem?
THANKS;
Boomer 83 733i


Thanks For info.


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