ssjerry Posted May 6, 2003 Report Share Posted May 6, 2003 i think maybe the catalytic converter is plugged up or bad on a 1991 GP with 3.1 engine. what is the allowable backpressure for the exhaust system? if someone has had one plugged before and fixed by replacing, what were the symptoms? i've got a pressure gage plumbed into the egr fitting on manifold and just realized i don't know what it should be. thanx. Quote Link to comment Share on other sites More sharing options...
Robby1870 Posted May 6, 2003 Report Share Posted May 6, 2003 symptoms include severe lack of power, rough idling. Shake the converter with your hand and see if it rattles. If it rattles, get a new one Robby Quote Link to comment Share on other sites More sharing options...
Lee Posted May 7, 2003 Report Share Posted May 7, 2003 in the case of my 91 regal it was aplugged up stock muffler. Quote Link to comment Share on other sites More sharing options...
Slade901 Posted May 7, 2003 Report Share Posted May 7, 2003 0 to 3 psi good 3 to 6 psi moderate restriction and loss of power 6 and higher major restriction and loss of power That's the PSI difference between pre-catalytic and after catalytic. Remember: Don't drill directly on the components themselves. Don't dril on the exhaust manifold, catalytic converter, muffler, etc., but only drill the exhaust pipes themselves. Quote Link to comment Share on other sites More sharing options...
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