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Re: loss of power, cat problem? help please!
Posted by xassh [Email] (more from xassh) on Sun, 7 May 2006 13:18:28
In Reply to: Re: loss of power, cat problem? help please!, dave, Sun, 7 May 2006 12:29:47
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short story relating to your prob - '97 suburban with 140k+ miles on it, nothing more done than oil changes and repairs only as necessary (fuel pump, alternator, etc). over time, there seemed to be a bit of a power loss, which was mentioned to the shop that changes the oil, tires. they diagnosed the problem as a pair of clogged catalytic converters and quoted somewhere in the $500-600 range for replacement.
i was able to convince my dad to have an exhaust specialist diagnose the situation. they drilled a small hole in the exhaust pre-cat and installed a pressure gauge. start the truck and rev the engine, the gauge would have gone through the top, had the cats (yes, two cats on this truck) been clogged. in this case, it was a clogged fuel pump and a very dirty air filter.
other areas i might inspect are the spark plugs, wires, distributor cap and coil. a failing coil will often work just fine until about 3k rpm, only to start cutting out once above this speed or boosting
posted by 68.4.168...
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