Posted by Peter Bradley on July 7, 2007, 3:57 pm, in reply to "bmw 3 series compact 1.8 53 plate"
Could be collapse in cat or rear box. Make an adapter using a discarded O2 sensor to connect a low pressure gauge to the front lamda position, the pressure would read less than 2psi @ 2000rpm if exhaust back pressure is correct.
Good luck, Peter.
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