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03-30-2008, 07:53 PM
| #1 |
| Junior Member Join Date: Mar 2008
Posts: 1
 | Bad catalyst converters I have a 1998 silverado 1500 350 vortec rear wheel drive my catalyst converters were bad so i took them off because the truck was jerking and sputtering losing power. After removing the converters it ran a lot better, but it still skips and sputter especially at speeds over 65. It does not idle smoothly and i get a lot of black smoke. while driving it level off and runs ok then a couple of miles down the road it starts to jerk and sputter again losing power. I need to know what else could be wrong, maybe the o2 sensors? I have over a hundred and seventy thousand miles |
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03-30-2008, 08:00 PM
| #2 |
| Junior Member  Join Date: Mar 2008 Location: Dublin ontario canada
Posts: 6
| Sounds like a coil or spark problem. My expedition did the same thing and it was a coil problem. |
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03-31-2008, 06:04 PM
| #3 |
| Banned Join Date: Mar 2008 Location: levittown pa
Posts: 2,197
 | you cats give you backpressure that you o2 sensors read. if your cats went bad then your o2s are more en likly bad also. if they went bad your computer would be geting a signal saying your running to rich or lean and that might cause your sputtering and hesitation. get new cats and o2 sensors and youll be rollin good again. your truck needs cats to run right anyway. and i wouldnt ge ttthe free flow cats from summit they only work good on pre o2 sensored trucks |
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03-31-2008, 06:15 PM
| #4 |
| Senior Member Join Date: Mar 2007 Location: Buffalo Ny
Posts: 661
| I woul dput my money on a bad injection spider or a bad coolant temp sensor..
__________________ Joe 89 K2500 Chevy, Wee-Oh-five 285K miles, completly rebuilt needs a motor, bad 1962 IHC Scout All Wheel Drive (Scout speak for locking axles) 152 ci, dana everything else |
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04-01-2008, 01:52 PM
| #5 |
| Senior Member  Join Date: Mar 2007 Location: Currently, I live in Lancaster county, Pennsylvania.
Posts: 3,170
| Being that I have had similar probelms with converters many times in the past. I feel like I can chime in a little. Depending on how long the converters were bad, and why they were, the problem could be more then you bargined for. If the converter blocked the flow of air out of the engine for any length of time, then back [ressure could have caused more damage. Timing could be off, but not in the ignition system, and perhaps not even in the fuel system, but rather in the valves. however, it could be as simple as build up on the valves, but take it from me, check the condition of the internals. I had the converter plug up in my pickup, and long sotry short, it is now sitting in my pard with a blown motor. It was a direct result of back pressure. I am glad you got it fixed, and hopefully I am just being over cautious with this statement, but I would hate to see a post in six months saying that the motor is knocking or quit and you do not know why. Minor prevention can save a ton of money. I just wish I knew the end result before I pushed off fixing mine.
__________________ The Blazer is dead, so I pumped her with lead, laid her to bed, and bought a FORD instead!   |
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04-01-2008, 02:58 PM
| #6 |
| Senior Moderator  Join Date: Feb 2006 Location: michigan
Posts: 6,374
| well, with the convertor(s) removed, i wouldn't be suprised if the truck is running rough. if the computer does not receive the correct reading from the o2 sensors then it will adjust the air/fuel ratio to compensate, causeing a very rich or lean condition, hench your black smoke. replace the cat, then check your o2 sensors, i bet you will find they are very slow or dead.
__________________ i'd rather be hunting |
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