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E34 (1989 - 1995)

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  #1  
Old 03-07-2013, 07:06 PM
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Mein Auto: 1992 BMW 535i (manual)
Bad catylatic converter? Or installation?

Needle moves slightly up and down during idle.
Check Engine light comes on during idle and occasionally comes on during drive at a steady speed.
Throttle delay.
Car starts to smell like gas during idle.(Inside and outside the car)
When you floor it you don't feel much acceleration.
Just overall feels like the car lost quite some horespower after the original catylatic converter got stolen.( Cant even spin the wheels anymore lol)

Could it be something simple to fix on the catylatic converter, or should i think about replacing it?

All suggestions are appreciated!

1992 535i 5 speed
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  #2  
Old 03-08-2013, 04:39 AM
snowsled7 snowsled7 is offline
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Have you pulled the codes using the stomp test yet? Sounds like you may have a bad O2 sensor.

How/Why does someone steal a catalytic convertor off a car? I realize there is some precious metal in the cat but the amount of work to remove it doesn't seem justified.

Maybe... the O2 sensor failed, ruined the convertor and it was removed because it was blocking the exhaust?

If anything the car should run better without it.

There is no fix for the convertor, it is a sealed unit, replacement is the only option.
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  #3  
Old 03-08-2013, 07:09 AM
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Ok thanks, so replacing the O2 sensor wont do any good?
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  #4  
Old 03-08-2013, 11:44 AM
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_Ethrty-Andy_ _Ethrty-Andy_ is offline
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Quote:
Originally Posted by snowsled7 View Post
Have you pulled the codes using the stomp test yet? Sounds like you may have a bad O2 sensor.

How/Why does someone steal a catalytic convertor off a car? I realize there is some precious metal in the cat but the amount of work to remove it doesn't seem justified.

Maybe... the O2 sensor failed, ruined the convertor and it was removed because it was blocking the exhaust?


If anything the car should run better without it.

There is no fix for the convertor, it is a sealed unit, replacement is the only option.
cats are worth a lot of money, especially to someone that knows what they are doing once they have it.

i have bolded above what my thoughts exactly are
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  #5  
Old 03-08-2013, 11:26 PM
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M540FELLA M540FELLA is offline
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I wonder if it has an o2 sensor at all. Most metal thieves don't carry a o2 socket.
Oh we stole your cat. but keep you sensor...
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  #6  
Old 03-22-2013, 07:00 AM
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Quote:
Originally Posted by M540FELLA View Post
Oh we stole your cat. but keep you sensor...
Haha, but I'm sure that the one I got came with an o2 sensor.
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  #7  
Old 03-25-2013, 07:08 AM
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I've been doing some research about my rough idle. Stays around 500 rpm but slightly moves down to about 300 rpm then back up to 500 rpm. Check engine light also goes on and off (Mainly at a complete stop, then goes away during drive) & acceleration is kind of slow/hesitant. Someone said that they replaced their spark plugs and it did the job. Someone elses also said that it may be a vaccum leak. It could be the o2 sensor but the catalytic converter came in good condition with the sensor. Question, could seafoam and or fuel injection cleaner make a difference as well? Because i know that the car's engine hasn't been maintained in a while. Thanks in advance.
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  #8  
Old 03-25-2013, 10:35 AM
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BMR_LVR BMR_LVR is offline
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As said above, you need to pull the codes; either via the stomp test or using a code reader. Otherwise, you are just stabbing in the dark.
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Quote:
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It's Deja Poo - as in, I've heard this **** before.
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Calypso Red 1992 525i with 200K miles

1991 735i - Sold
1992 525i - Sold
1995 325is - Sold
2000 528i - Sold

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  #9  
Old 03-26-2013, 05:05 PM
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Thanks but i can't do the stomp test. I would go to autozone or something, but they only diagnose cars years 1996 and up.
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  #10  
Old 03-26-2013, 06:29 PM
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BMR_LVR BMR_LVR is offline
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Quote:
Originally Posted by Dionte View Post
Thanks but i can't do the stomp test. I would go to autozone or something, but they only diagnose cars years 1996 and up.
Don't take this wrong, but perhaps you are not doing the stomp test correctly. There have been many before you who couldn't do it at first.

If you will post a video of your attempts, we can see if you are doing it right or not. Several here posted their attempts and we were able to see the problem with their technique and were able to help them do it right.
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Most problems are usually something simple !

Quote:
Originally Posted by noego View Post
It's Deja Poo - as in, I've heard this **** before.
Steve

Calypso Red 1992 525i with 200K miles

1991 735i - Sold
1992 525i - Sold
1995 325is - Sold
2000 528i - Sold

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  #11  
Old 03-26-2013, 08:34 PM
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The thing is, my OBC is not connected lol. The radio got stolen out of the car a while back and they ripped out the whole center and cut the cable to the OBC. I need to find the correct part online so i can replace it and be a able to do the stomp test.
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  #12  
Old 03-26-2013, 10:07 PM
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M540FELLA M540FELLA is offline
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Your obc missing shouldn't matter. That's just a computer that keeps up time, outside temp, etc. It has nothing to do with actually controlling the engine. The computer that controls the engine is what's called a DME and I can guarantee that they didn't steal it.
Watch this vid and go and try it please! It's the only way we can help you any farther.

Turn ignition to position 2 and press gas to the floor five times. It's a four digit code.For example the code from the video: One blink means 1, goes out for 1/2 sec., Two blinks means 2, goes out for 1/2 sec.,Two blinks means 2, goes out for 1/2 sec.,One blink means 1 which means your code is 1221.
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  #13  
Old 03-27-2013, 05:25 AM
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Oh ok, thanks. I really thought that the codes came up on the OBC. I'll give it a try.
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  #14  
Old 03-27-2013, 01:19 PM
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BMWFatherFigure BMWFatherFigure is offline
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You seem to have over fuel problems. Could be sensors telling the DME lies or bad injectors etc. O2 sensor and injector rig clean first, and check for vacuum leaks. Then go on form there. +1 on stomp test too.
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  #15  
Old 08-08-2013, 07:06 AM
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Quick update, I've replaced the vaccum lines a few weeks ago but i already knew that the o2 sensor was failing. I'm getting the o2 sensor replaced this weekend. Could it be possible that my performance may not increase as much due to the o2 sensor fauling the catylatic converter?
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1992 535i 5-Speed
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  #16  
Old 08-08-2013, 04:38 PM
south26 south26 is offline
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Quote:
Originally Posted by snowsled7 View Post
How/Why does someone steal a catalytic convertor off a car? I realize there is some precious metal in the cat but the amount of work to remove it doesn't seem justified.
Heck I just got 150 for a 525i cat and I was happy. The place even paid for shipping. Only took about 20 minutes with my angle grinder.


Andy
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  #17  
Old 08-10-2013, 07:25 PM
Robinson Crusoe Robinson Crusoe is offline
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Quote:
Originally Posted by snowsled7 View Post
Have you pulled the codes using the stomp test yet? Sounds like you may have a bad O2 sensor.

How/Why does someone steal a catalytic convertor off a car? I realize there is some precious metal in the cat but the amount of work to remove it doesn't seem justified.

Maybe... the O2 sensor failed, ruined the convertor and it was removed because it was blocking the exhaust?

If anything the car should run better without it.

There is no fix for the convertor, it is a sealed unit, replacement is the only option.
Meth is a hell of a drug
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  #18  
Old 08-26-2013, 08:13 AM
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After the o2 sensor replacement, she idles perfectly now and is way more responsive than ever!
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1992 535i 5-Speed
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