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GET YOURSELF AN INFARED THERMOMETER AND HOLD THE ENG SPEED AT 1500 RPM FOR ABOUT 2 MIN AS STEADY AS YOU CAN, KEEP IT AT THIS SPEED AND CHECK THE INLET TEMP OF THE CAT AND THE OUTLET TEMP ,THE OUTLET SHOULD BE AT LEAST 350-400 DEGREES HIGHER AT THIS POINT THAN THE INLET, IF IT IS VERY CLOSE INLET AND OUTLET REPLACE THE CONVERTOR , IT HAS THE OLD GM PANCAKE CONV, AND THEY ARE NOT KNOWN FOR LONG LIFE AFTER 125000 OR SO. JERRY


Jerry, I used an IR thermometer just a moment ago. I had driven the Trooper several miles, then had my wife hold the RPMs between 1500 and 2000. I took 7 readings, just to be sure. The average of the 7 is 403? at the inlet to the Cat, and 327? at the outlet. Those are measured within 2 inches of the cat.

Just to be sure, to verify, the outlet should be 350? higher than the inlet? That makes sense if the cat is burning unused gases.

Am I looking at a new cat? This one LOOKS to be in good shape. It's not even rusted. I think it's a Catco brand. These things are too expensive to be replacing every couple years. Do I need a new one again?

Thanks Jerry,

Ken

1989 Trooper, 2.6
1989 Trooper, 2.8
1992 Ford F-350, 7.3

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