Quote:
Originally Posted by A26B
I have heard of 90 model problems with cat failure and catalyst reversion into the engine, but there is no visible damage indicating that. The cat would seem to be bad but not to the extent of complete blockage. Could exhaust restriction/backpressure cause these problems?
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Wouldn't back pressure cause piston and top ring erosion instead?
He should rule out the back pressure theory by instrumenting both RH and LH exhaust pipes in front of the cats for pressure. I think some of the professional tool shops would have suitable gauges.
Were all the RH liners sloughing nikasil ??
This sounds like a question for Graham -