I believe that my misfires are caused by a clogged cat. Here's why:
1. The engine only seems to misfire when I accelerate or maintain a certain speed above 1500 rpm. When you accelerate or maintain speed, you have more exhaust coming through the cat converter. So with the cat being clogged, the exhaust gases are getting trapped and coming back through to the engine.
2. I ran an OBD tool on my car and it came up with a code (P0300) which means random misfire or misfire detected. Nothing more specific like a cyl number or sensor going bad.
3. This problem has gotten progressivly worse as the car gets older. I bought the car with 51,000 miles on it. When I first bought it, it was trouble free. After putting about 15,000 miles on it, it seemed to misfire on and off on rare occaisions. It now has 93,000 since I bought the car in Feb of 2000, and it ALWAYS wants to misfire. I now have to take it easy on the gas or it sputters and chokes like a *****.
4. I have replaced every part of the ignition at least once; ign. module once, coil packs once, wires and plugs 4 times. It can't be the ignition.
Although I know that it can be any number of things, this is what I am leaning towards. Just needed to know if there is any information that I am missing and if this theory is correct.
Thanks
[ November 20, 2002: Message edited by: Mogobs30th ]</p>
1. The engine only seems to misfire when I accelerate or maintain a certain speed above 1500 rpm. When you accelerate or maintain speed, you have more exhaust coming through the cat converter. So with the cat being clogged, the exhaust gases are getting trapped and coming back through to the engine.
2. I ran an OBD tool on my car and it came up with a code (P0300) which means random misfire or misfire detected. Nothing more specific like a cyl number or sensor going bad.
3. This problem has gotten progressivly worse as the car gets older. I bought the car with 51,000 miles on it. When I first bought it, it was trouble free. After putting about 15,000 miles on it, it seemed to misfire on and off on rare occaisions. It now has 93,000 since I bought the car in Feb of 2000, and it ALWAYS wants to misfire. I now have to take it easy on the gas or it sputters and chokes like a *****.
4. I have replaced every part of the ignition at least once; ign. module once, coil packs once, wires and plugs 4 times. It can't be the ignition.
Although I know that it can be any number of things, this is what I am leaning towards. Just needed to know if there is any information that I am missing and if this theory is correct.
Thanks
[ November 20, 2002: Message edited by: Mogobs30th ]</p>
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