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1996 Mercury Cataylic converter rattle


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mercuryman
User

Sep 14, 2013, 5:53 AM

Post #1 of 27 (1797 views)
1996 Mercury Cataylic converter rattle Sign In

I have a 1996 Mercury Grand Marquis, and replaced the cataylic converter last summer. It has a loud rattle noise.It is NOT a heat shield.

I read a post about drilling a hole in it? Sounds crazy to ruin a fairly new cc.
I also noticed the adapter cable is broken off the screw on the side of the converter. Would that have anything to do with it making noise?


Hammer Time
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Sep 14, 2013, 6:03 AM

Post #2 of 27 (1796 views)
Re: 1996 Mercury Cataylic converter rattle Sign In

Does the Catalyst rattle if you hit it with the heel of your hand?



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mercuryman
User

Sep 14, 2013, 6:11 AM

Post #3 of 27 (1789 views)
Re: 1996 Mercury Cataylic converter rattle Sign In

hi Hammer
I will go out in a while, and try that. Post again shortly. Thanks.


mercuryman
User

Sep 14, 2013, 6:52 AM

Post #4 of 27 (1783 views)
Re: 1996 Mercury Cataylic converter rattle Sign In


In Reply To
Does the Catalyst rattle if you hit it with the heel of your hand?



Yes the Catalyst rattled with the car off, and hit it with my hand.


Hammer Time
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Sep 14, 2013, 7:31 AM

Post #5 of 27 (1779 views)
Re: 1996 Mercury Cataylic converter rattle Sign In

So, it needs to be replaced. The substrate is broken.

If it was replaced last summer, it should be under warranty.



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(This post was edited by Hammer Time on Sep 14, 2013, 7:45 AM)


Discretesignals
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Sep 14, 2013, 7:36 AM

Post #6 of 27 (1777 views)
Re: 1996 Mercury Cataylic converter rattle Sign In


Quote
I also noticed the adapter cable is broken off the screw on the side of the converter.


Not sure what you mean here.





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mercuryman
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Sep 14, 2013, 2:21 PM

Post #7 of 27 (1768 views)
Re: 1996 Mercury Cataylic converter rattle Sign In


In Reply To

Quote
I also noticed the adapter cable is broken off the screw on the side of the converter.


Not sure what you mean here.


There is a light green wire with plug-in adapter that has a silver jack plug in on the end that goes into the nut on the side of the cataylic converter. It is broken on the end that goes into CC.


Discretesignals
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Sep 14, 2013, 2:35 PM

Post #8 of 27 (1765 views)
Re: 1996 Mercury Cataylic converter rattle Sign In

Does it look like this?







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mercuryman
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Sep 14, 2013, 2:53 PM

Post #9 of 27 (1763 views)
Re: 1996 Mercury Cataylic converter rattle Sign In


In Reply To
Does it look like this?




Yes that's it.


Discretesignals
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Sep 14, 2013, 4:02 PM

Post #10 of 27 (1757 views)
Re: 1996 Mercury Cataylic converter rattle Sign In

That is the oxygen sensor. Your check engine light must be on.

If the front 02 sensor isn't working, that could damage your catalyst. The computer needs the signal from the front O2 sensor to be able to trim the fuel to air ratio for proper converter operation.

How long has it been like that?





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(This post was edited by Discretesignals on Sep 14, 2013, 4:04 PM)


mercuryman
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Sep 14, 2013, 4:30 PM

Post #11 of 27 (1753 views)
Re: 1996 Mercury Cataylic converter rattle Sign In


In Reply To
That is the oxygen sensor. Your check engine light must be on.

If the front 02 sensor isn't working, that could damage your catalyst. The computer needs the signal from the front O2 sensor to be able to trim the fuel to air ratio for proper converter operation.

How long has it been like that?

Not sure. I had no reason to go under the car except for oil change, cause the car has not had any trouble since August of last year. I took out the bulb from the dash, so I would not see any check engine light over 3 years ago.


Discretesignals
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Sep 14, 2013, 4:36 PM

Post #12 of 27 (1751 views)
Re: 1996 Mercury Cataylic converter rattle Sign In

You'll probably need to replace the damaged O2 sensor. Then you will probably need another catalytic converter because it may have gotten toasted. Then it would be important to clear the trouble codes from the PCM and then see if any come back.





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Hammer Time
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Sep 14, 2013, 4:47 PM

Post #13 of 27 (1749 views)
Re: 1996 Mercury Cataylic converter rattle Sign In


Quote
I took out the bulb from the dash, so I would not see any check engine light over 3 years ago.



I'm gonna bite my tongue.........................



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Discretesignals
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Sep 14, 2013, 4:54 PM

Post #14 of 27 (1747 views)
Re: 1996 Mercury Cataylic converter rattle Sign In

I did the same thing. I knew it would be useless to even go down that road.





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mercuryman
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Sep 14, 2013, 6:04 PM

Post #15 of 27 (1744 views)
Re: 1996 Mercury Cataylic converter rattle Sign In

OK I will replace the sensor, and see what else I can do to quiet the car down. 280,000 miles, and it was so quiet until the cat converter starting screaming.


Discretesignals
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Sep 15, 2013, 6:58 AM

Post #16 of 27 (1733 views)
Re: 1996 Mercury Cataylic converter rattle Sign In

If you replace just the sensor and the catalyst substrate has come apart or melted, you really don't want to be putting a new sensor in that environment.





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Hammer Time
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Sep 15, 2013, 7:57 AM

Post #17 of 27 (1725 views)
Re: 1996 Mercury Cataylic converter rattle Sign In


Quote
OK I will replace the sensor, and see what else I can do to quiet the car down. 280,000 miles, and it was so quiet until the cat converter starting screaming.




If you think the noise is your only problem, then just turn the radio up. The noise isn't the issue here. The broken catalyst is.



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MarineGrunt
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Sep 15, 2013, 8:01 AM

Post #18 of 27 (1724 views)
Re: 1996 Mercury Cataylic converter rattle Sign In


Quote
I took out the bulb from the dash, so I would not see any check engine light over 3 years ago.




That reminds me of an episode of The Simpons where Homer's piece of black electrical tape that he put over the check engine light fell off. He said "whoops", put it back on and said something like, "who needs a mechanic, the car is good as new again".


Now if they put something like that in a cartoon comedy it proves how idiotic it is to ignore and even go as far as to take the bulb out or cover the light with electrical tape. When the check engine light is on your car is telling you that something is wrong. Many times, if ignored, it will end up costing you more money in the long run. If one thing is malfunctioning it could cause other issues and even possible engine damage.

I'm really surprised you bit your tongue HT! You too DS! Normally you guys would be all over something like that. Cool


Discretesignals
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Sep 15, 2013, 8:06 AM

Post #19 of 27 (1721 views)
Re: 1996 Mercury Cataylic converter rattle Sign In

I thought about it MG, but why even bother. If the owner doesn't want to figure out or fix the problem that is causing the light to come on and wants to disconnect it, that is their problem not mine.

I am really surprised HT didn't fire up his flame thrower though...lol





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Hammer Time
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Sep 15, 2013, 8:08 AM

Post #20 of 27 (1720 views)
Re: 1996 Mercury Cataylic converter rattle Sign In


Quote
I'm really surprised you bit your tongue HT!


You can see what we're dealing with here. I'm concluding the whole effort is just a waste.



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We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.



MarineGrunt
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Sep 15, 2013, 11:35 AM

Post #21 of 27 (1706 views)
Re: 1996 Mercury Cataylic converter rattle Sign In


Quote
I am really surprised HT didn't fire up his flame thrower though...lol



lol.....I can only imagine what words of wisdom he had going through his head. You know he instantly had his fingers on the keyboard ready to fire away and at the last second said the heck with it.



Quote
You can see what we're dealing with here. I'm concluding the whole effort is just a waste.



You know, by the time he tore the cluster out and pulled the bulb it probably would've been easier and quicker to get the codes scanned and replace a faulty part.


Discretesignals
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Sep 15, 2013, 11:43 AM

Post #22 of 27 (1704 views)
Re: 1996 Mercury Cataylic converter rattle Sign In

For all we know he could of drilled a hole through the cluster faceplate and ripped the bulb out with a pair of needlenose.





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(This post was edited by Discretesignals on Sep 15, 2013, 11:43 AM)


nickwarner
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Sep 15, 2013, 2:54 PM

Post #23 of 27 (1694 views)
Re: 1996 Mercury Cataylic converter rattle Sign In

You mean there's another way to do that? Boy now I feel dumb.


Hammer Time
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Sep 15, 2013, 3:09 PM

Post #24 of 27 (1693 views)
Re: 1996 Mercury Cataylic converter rattle Sign In

I can do it through the tailpipe.



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Discretesignals
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Sep 15, 2013, 5:24 PM

Post #25 of 27 (1686 views)
Re: 1996 Mercury Cataylic converter rattle Sign In

Please tell me you don't do that with your lips or something along those lines...Sly





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