Question about 1997 Oldsmobile Aurora

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Popping/backfiring thru intake under accel

I have the same problem 1995 olds aurora when i crank the car , starts , gets warm,(normal temp 210??) and when reved in p sounds throaty has good strong sound but when driving down the hwy 65-80mph under a load up a hill popping and loss of power but thru intake is my cat stopped up its not glowing red ,fuel filter clogged some sensor bad no check engine light think the bulb burnt out is my cams shot (no ticking noise ) any help is greatley appreciated is this car obd1 or obd 2 manufacture date of 01/95

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Well that car is a obd1. There are many issues that can cause that. A engine that usually misfires or surges under a heavy load or at higher speeds usually indicates it is starved for fuel. I would for sure change the fuel filter if has not been done in last 30,000. I would check fuel pressure and fuel volume. Yes the converter that is clogged causes lack of power, misfire, and poor fuel economy. If the converter is clogged well you still have to fix the problem that caused converter to clog, which is usually an overly rich air/fuel mixture. Most the time it gets clogged due to a bad spark plug, wire, or valve not seating causing raw fuel to enter the exhaust system. I would first check the basics look for any vacuum leaks check the plugs see if they are black and dry (carbon fouled) from to rich fuel mixture, caused by weak ingition, dirty air cleaner, defective fuel pump, e.t.c. or if they white or gray insulator with black or gray brown spots, from low fuel pressure or incorrect timing e.t.c. If you dont find any vacuum leaks bad plugs clogged air cleaner then you need to check the sensors map, mass air flow, etc. I would check your check engine light, when you first turn the key to the on position it should light up, if not than its burnt. Computer codes make diagnosis alot easier. If you can get the codes if it has them let me know. Most exhaust shops will check converter for free. Hope this helps you get a understanding.

Posted on Jul 25, 2009

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