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Graham
01-27-2000, 06:36 PM
The catalytic converter on my '89 325i (122k miles) needs to be replaced, and I am told by a cat converter "specialist" that it would not have gone bad on its own, but was deteriorated by a problem in the engine. I am no mechanic, but would like to understand what may have caused the problem. A symptom that I think may be related is that when I start the car, it will crank for a few seconds (2-5) before it starts (possible oxygen sensor problem?). The engine had a tune up about 10k miles ago. Any advice or information is appreciated. Thanks.

Troy
01-28-2000, 10:10 AM
<i>: The catalytic converter on my '89 325i (122k miles) needs to be replaced, and I am told by a cat converter "specialist" that it would not have gone bad on its own, but was deteriorated by a problem in the engine. I am no mechanic, but would like to understand what may have caused the problem. A symptom that I think may be related is that when I start the car, it will crank for a few seconds (2-5) before it starts (possible oxygen sensor problem?). The engine had a tune up about 10k miles ago. Any advice or information is appreciated. Thanks. <p></i>

Troy
01-28-2000, 10:13 AM
<i>: The catalytic converter on my '89 325i (122k miles) needs to be replaced, and I am told by a cat converter "specialist" that it would not have gone bad on its own, but was deteriorated by a problem in the engine. I am no mechanic, but would like to understand what may have caused the problem. A symptom that I think may be related is that when I start the car, it will crank for a few seconds (2-5) before it starts (possible oxygen sensor problem?). The engine had a tune up about 10k miles ago. Any advice or information is appreciated. Thanks. <p></i>It is completely normal for a catalytic converter to go bad after 100k miles. Your "specialist" obviously doesn't know what he's talking about. If you replace it, use only original factory equipt, or spend the extra cash and purchase a Borla integrated exaust system. It's worth the extra cost. Take it from us experts in California, the state that gets "screwed" the worst when it comes to smog regulations!

Dave S.
01-28-2000, 12:17 PM
<i>: The catalytic converter on my '89 325i (122k miles) needs to be replaced, and I am told by a cat converter "specialist" that it would not have gone bad on its own, but was deteriorated by a problem in the engine. I am no mechanic, but would like to understand what may have caused the problem. A symptom that I think may be related is that when I start the car, it will crank for a few seconds (2-5) before it starts (possible oxygen sensor problem?). The engine had a tune up about 10k miles ago. Any advice or information is appreciated. Thanks. <p></i>Troy is spot on. The cat, like oxygen sensors, spark plugs, and timing belts, eventually has to be replaced. I'd be looking for a new mechanic.

Troy
01-28-2000, 01:19 PM
<i>: : The catalytic converter on my '89 325i (122k miles) needs to be replaced, and I am told by a cat converter "specialist" that it would not have gone bad on its own, but was deteriorated by a problem in the engine. I am no mechanic, but would like to understand what may have caused the problem. A symptom that I think may be related is that when I start the car, it will crank for a few seconds (2-5) before it starts (possible oxygen sensor problem?). The engine had a tune up about 10k miles ago. Any advice or information is appreciated. Thanks. <p>: Troy is spot on. The cat, like oxygen sensors, spark plugs, and timing belts, eventually has to be replaced. I'd be looking for a new mechanic.<p></i>Hey Dave, you sound very knowledgeable. How about answering my question posted above regarding "Oil Change Warning Lights?"

SeanMac
01-28-2000, 03:41 PM
<i>: The catalytic converter on my '89 325i (122k miles) needs to be replaced, and I am told by a cat converter "specialist" that it would not have gone bad on its own, but was deteriorated by a problem in the engine. I am no mechanic, but would like to understand what may have caused the problem. A symptom that I think may be related is that when I start the car, it will crank for a few seconds (2-5) before it starts (possible oxygen sensor problem?). The engine had a tune up about 10k miles ago. Any advice or information is appreciated. Thanks. <p></i>Graham,<br>The other comments aside (I believe they're right as well - sometimes you just have to replace parts) a bad O2 sensor can destroy the cat by running the engine too rich. However, you'd know you had a problem long before the cat fouled as the car would not run properly, and it takes quite a bit of neglect to allow it to go that long.<p>My .02<br>SeanMac<br>86 325

Dirk
01-28-2000, 04:10 PM
I am the original owner and have 200,000+ miles.<p>Cats perfect! Was I just lucky? In all my car I have ever own not one required a cat. My friend's cat went out but after 360,000 on that 79 280z what can you expect. No sure that cat was original on that car.<p>D<p>

Troy
01-28-2000, 05:16 PM
<i>: I am the original owner and have 200,000+ miles.<p>: Cats perfect! Was I just lucky? In all my car I have ever own not one required a cat. My friend's cat went out but after 360,000 on that 79 280z what can you expect. No sure that cat was original on that car.<p>: D<p></i>Is your grammer actually that bad, or are you just joking with me?

Troy
01-28-2000, 05:19 PM
<i>: I am the original owner and have 200,000+ miles.<p>: Cats perfect! Was I just lucky? In all my car I have ever own not one required a cat. My friend's cat went out but after 360,000 on that 79 280z what can you expect. No sure that cat was original on that car.<p>: D<p></i>Is your grammer actually that bad, or are you just pretending to be illiterate?

Barry
01-29-2000, 03:28 AM
<i>: The catalytic converter on my '89 325i (122k miles) needs to be replaced, and I am told by a cat converter "specialist" that it would not have gone bad on its own, but was deteriorated by a problem in the engine. I am no mechanic, but would like to understand what may have caused the problem. A symptom that I think may be related is that when I start the car, it will crank for a few seconds (2-5) before it starts (possible oxygen sensor problem?). The engine had a tune up about 10k miles ago. Any advice or information is appreciated. Thanks. <p></i>Although Cats are stated as having a limited lifespan, they should last well over 200K miles without problems. 122K miles sounds really low to be replacing a cat on a BMW. I'd look at how the engine is running, air/fuel mixture, O2 sensor, etc. There may very well be something else going on there causing your Cat to fail at 122K.

Adrian
01-30-2000, 10:33 PM
<i>: : I am the original owner and have 200,000+ miles.<p>: : Cats perfect! Was I just lucky? In all my car I have ever own not one required a cat. My friend's cat went out but after 360,000 on that 79 280z what can you expect. No sure that cat was original on that car.<p>: : D<p>: Is your grammer actually that bad, or are you just pretending to be illiterate?<p></i><p><br>Hahahahahahahaha! Talk about being illiterate! It is spelt GRAMMAR. Before you go criticizing people, you should look at your own stupidity first. God, I have never seen nastier and stupider people in my life.

Troy
02-01-2000, 10:55 AM
<i>: : : I am the original owner and have 200,000+ miles.<p>: : : Cats perfect! Was I just lucky? In all my car I have ever own not one required a cat. My friend's cat went out but after 360,000 on that 79 280z what can you expect. No sure that cat was original on that car.<p>: : : D<p>: : Is your grammer actually that bad, or are you just pretending to be illiterate?<p><br>: <br>: Hahahahahahahaha! Talk about being illiterate! It is spelt GRAMMAR. Before you go criticizing people, you should look at your own stupidity first. God, I have never seen nastier and stupider people in my life. <p></i>Sorry Dirkie, I didn't mean to offend you and your lover!! It's nice of you to stick up for him!


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