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  #1  
Old 10-07-2011, 07:44 PM
mrnotfish mrnotfish is offline
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Default 5.9 left me stranded, Catalytic converter???

Ok, so my wife was driving to work today and the truck just sort of ground to a halt on the highway. She drove it until it wouldn't go any further and called me for help. The truck has 163,000 Kilometers, (101,000 miles). I don't have much intimate knowledge of this truck, because I only bought it 3 days ago.


Given the symptoms, and having done some research I'm assuming it's a plugged cat:

• Truck will start but sounds hollow and breathy, if that makes sense.

• Engine seems to have trouble staying alive - Will idle, but sounds like it will quit if I leave it on long enough.

• When I place a hand over the end of the exhaust pipe, very little pressure/pulsation is felt.

• When I crawled under the truck and donkey kicked the Cat, it produced lovely rattling sounds.


My questions are as follows: Can I take my 18v sawzall out to where the truck is and just cut the pipe before the cat, JUST to get it home? I have the means to put in a new cat at home, and it's not that far away, so I basically want to avoid paying for a tow truck.

How loud will it be if I do this, and will the computer freak out and cripple the truck when it realizes there is no exhaust system?

Also, what other issues can I expect to run into? I can't imagine it's good to choke an engine out like this.

Last edited by mrnotfish; 10-07-2011 at 07:48 PM.
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Old 10-08-2011, 12:29 AM
mrnotfish mrnotfish is offline
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I've been reading about pulling the front o2 sensor to diagnose the issues. Would I be able to drive the truck back to my house with the o2 sensor out? Will it run at all?
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Old 10-09-2011, 12:33 AM
Ram BeaSST Ram BeaSST is offline
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what a coincidence...i bought my truck 3 days ago, too.

it will be very very loud if exhaust doesn't go thru the muffler but it won't freak out the computer and cripple the truck. i once drove 30 miles home in my 93 Camaro with the catback off when the rusted bolts holding the catback to cat broke off. ugh...that was loud.

truck will run without the o2 sensor but the check engine light on dash would probably light up.
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Old 10-21-2011, 03:00 AM
Screamintrashcan Screamintrashcan is offline
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Time to test the fuel pressure, and if theres any varience in the pressure, AT ALL, you need a fuel pump. The ECU will do everything it can to make things normal for the engine to run, but all it manages to do is confuse the diagnostician. stick a gauge on the intake manifold port, place the gauge under a wiper, and start and observe. leave it that way until the engine turns into a bad actor, mine took 85 miles, but when it did, the fuel pressure was twitching, that seems to play games with the ECU, and it runs really lean, backfires out of both ends, you name it... New pump, no more grief. PS, there is no fuel filter, unless someone added one. Filter is non serviceable, integral in the pump.
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