--- "Marc A. Levy" wrote: > I have always suspected that the removal of the CAT causes > some problems with the accuracy of the O2 Sensor. This COULD be: removal of the cat makes the gasses flow more freely and perhaps a little faster, so the Lambda sensor gets a smaller dosage to measure (I guess)... The cat restricts gas flow in one specific location, just the location the O2 sensor is placed at (another guess)... The funny thing is that I know of several other people that have their cat off (they inspired me to do so too) and they do NOT have my problems... DMC Joe gave soem advice I will have them check out, if this doesn't work I'll just leave it as it is then. Can backfiring really do any damage? Or does the backfire have to be really severe for that (like damaging the valves or something like that?) Thanks, JAN van de Wouw Thinking Different... Using a Mac... Living the Dream... Driving a DeLorean... #05141 "Dagger" since Sept. 2000 check out the Delorean-Files at: http://www.deloreanfiles.nl/ ------------------------------