Shooting Fire

[bmwman91]

The M42 tends to run rich, especially when you snap off of the throttle it will still be dumping fuel in as the DME waits for the AFM to snap shut. Without the cat in there, it sounds like a recipe for flames.

[Holland]

I'm thinking no cat may be suspect, although the O2 sensor is in front of it.

[dannyyisntt]

Your car shoots flames because racecar

[oldmann]

No Cat, still have O2 sensor? O2 sensor giving bad info to dme may have gone into failsafe mode. Will run rich to protect motor from running too lean.

[duleymane///iS]

Very inneresting..

Do you have any ideas? I mean the car still pulls nicely 5th seems a little less torquey though. Have you ever heard of a N/A stock M42 doing this? I feel like it could be a pre-courser to something bad :/ its very weird. I also forgot to mention and this happens quite a bit. I will be driving around base or something really slow like a village going maybe 30mph and when going from 2nd to 3rd or vice versa it after fires; not all the time but enough to get pulled over by the SP's I am pretty sure a flame is probably accompanied by those to as when people have seen the flames the after fires occurred if that makes sense.

[mtechnik]

Very inneresting..

[duleymane///iS]

So it has been brought to my attention from a fellow BMW owner (E90 335i) that my car has been shooting flames from the muffler. He said he saw them as he was following me on the off ramp from the Autobahn and as I downshifted from 4th to 3rd he said a foot long flame blew out. This is not the 1st occurrence I was drifting at a local Park and Ride and I bounced it off the limiter a few times in second and my buddies once again said it shot flames. Now it seems "cool" but I know something has to be up; it's a stock M42 with: Mess Under the Intake, New spark plugs, cleaned the ICV, running German 98 octane (91-93 American) stock manifold, 2.25 inch exhaust no cat with some German no name resonator and a Magnaflow muffler in the rear. Could it be a leaky injector? My fuel economy has gone down as well. ALOT I went from like 650km a tank to about 420km a tank. And my idle was preacher dick solid all winter at 850rpm, now it likes to mess around from 500 to 1300 rpm. Any input would much appreciated :D