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Re: You said your car has a custom exhaust... (archive)
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Posted by Richard '83 533i Houston on February 04, 2002 at 09:43:50:

In Reply to: Engine Missfire posted by Simon Bennett on February 03, 2002 at 17:22:38:

please elaborate. The reason I ask, if you decrease the back pressure of exhaust system enough you can actually induce a lean run situation. The chip in the ECU is actually set to run the car on the lean side of stoiciometric for emissions. When I installed my custom exhaust I ran into a similar situation but not as severe. I had to bump my fuel pressure up by swapping in a 3.0 bar FPR for the stock 2.5 bar unit (the 533i has M5 injectors but uses a 2.5 bar FPR).

You may want to look into your actual fuel pressure, the FPR is known for going bad and can cause all sorts of weird drivability problems.

HTH

Rich

Feels like a vacume leak, runs, but burbles, no power, car vibrates under load, replaced airduct, vacume hoses, fuel filter, plugs all look good, It has a custom exhaust, any ideas?




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