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#1779476 - 05/31/09 03:58 PM How To Check Catalytic Converters
capt512 Offline
Over the Hill

Registered: 12/22/02
Posts: 2466
Loc: KC, MO
I knew a while back there were some posts about checking catalytic converters and heat shields. I know there was something about banging on them with a hammer. However recently at very low rpms I have started to hear a rattle from somewhere under the car. I don't smell sulfur and the floorboards aren't warm so I am guessing heat shields if anything, but couldn't remember if there was a special way to check them....?
_________________________

2001 CVPI - Ex-Kansas Turnpike Authority (Sold)
2000 CVPI - Ex-Kansas Turnpike Authority
2003 Marauder (300A)

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#1779613 - 05/31/09 07:17 PM Re: How To Check Catalytic Converters [Re: capt512]
CommandPresence Offline
Over the Hill

Registered: 08/01/08
Posts: 1237
Loc: Granite State
I believe it was lay under the car with a rubber mallet when it's cold, and listen for "rubble" to bounce around in there. Kind of sounding like marbles IIRC.
_________________________
2003 Ford Crown Victoria Police Interceptor.

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#1779675 - 05/31/09 08:41 PM Re: How To Check Catalytic Converters [Re: capt512]
Ciffer Offline
Over the Hill

Registered: 05/16/06
Posts: 4344
Loc: Socialist State of MN
 Originally Posted By: capt512
I knew a while back there were some posts about checking catalytic converters and heat shields. I know there was something about banging on them with a hammer. However recently at very low rpms I have started to hear a rattle from somewhere under the car. I don't smell sulfur and the floorboards aren't warm so I am guessing heat shields if anything, but couldn't remember if there was a special way to check them....?


does it sound like marbles rolling around in a coffee can? if so, clean the MAF, disconnect the battery and see if that fixes it.
_________________________
-Carl
1997 Crown Victoria p71, garage queen. 135,000 miles.
MZT, T-45, ENS bushings, IAS shocks, magnaflow cat pipes, Truetrac, 02 brakes, 99 TC rims, 97 TC seats, Mark VIII fan.

1987 Mercedes-Benz 300D Turbo. Winter car. 139hp of slow. 227k when the odometer broke long ago. Runs, shifts, drives, doesn't rust.

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#1779677 - 05/31/09 08:47 PM Re: How To Check Catalytic Converters [Re: Ciffer]
flyboy Offline
Ret US Army Medic
Poobah

Registered: 07/23/05
Posts: 5188
Loc: Chillicothe, Mo
I had one go bad on the Sport. A rattling sound on slow acceleration coming from under the car was my first hint. I was fortunate since I only had 10k on the Sport when it went bad & warranty covered it.
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Very happy with the MKS. Finally got used to all the bells & whistles. Better handling, good MPG (25-27 highway) Better stopping distance & much faster acceleration.

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#1779684 - 05/31/09 08:54 PM Re: How To Check Catalytic Converters [Re: flyboy]
interceptor09 Offline
Over the Hill

Registered: 06/16/08
Posts: 2668
Loc: Just this side of Hell
 Originally Posted By: flyboy
I had one go bad on the Sport. A rattling sound on slow acceleration coming from under the car was my first hint. I was fortunate since I only had 10k on the Sport when it went bad & warranty covered it.


Bing... my cat was the same way when it went. rattle at slight acceleration and idle.
_________________________

A Jrizzo-mod
Dumped GT500 Mufflers with a rear-cat delete
OEM GT500 Wheels and tires
GT500 Mufflers Exhaust Vid: http://www.youtube.com/watch?v=2mUcVjUEjoU

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#1779700 - 05/31/09 09:10 PM Re: How To Check Catalytic Converters [Re: interceptor09]
capt512 Offline
Over the Hill

Registered: 12/22/02
Posts: 2466
Loc: KC, MO
Will check tommorow! Thanks. Mine started about a week ago when I was backing out of the driveway I noticed it. Its when the car idles down low, say 5-700rpms I notice it the worst then it rattles a little up to say 900RPM. It sounds like metal touching metal vibrating quickly.

Saying that it is a catalytic converter, should I have a CEL? Also what should I look to pay to replace, and should I replace just one or more??

Thanks.
_________________________

2001 CVPI - Ex-Kansas Turnpike Authority (Sold)
2000 CVPI - Ex-Kansas Turnpike Authority
2003 Marauder (300A)

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#1779707 - 05/31/09 09:19 PM Re: How To Check Catalytic Converters [Re: capt512]
KayTar Offline
Poobah

Registered: 05/13/09
Posts: 7770
Loc: Alberta, Canada
I had a Ford Probe GT and had the cat plug up on me. Very dangerious!!! The foot wells of the car got retardedly hot and the car had no power. When it got that bad I fixed it right away and found a huge difference. Checking your cats is something everyone would do if you suspect something is up.
_________________________
2003 P71 - MZT, 3.73s, Victor Jr intake, OBX kit, 78MM TB SOLD
2005 P71 - K&N Intake, various tint rest stock SOLD
2010 Challenger RT Classic - JBA longtubes, Pypes exhaust SOLD
2008 P71 - Vortech V2-SQ, 3.4" pulley, 2nd cats removed, yeah it goes.

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#1779836 - 05/31/09 11:25 PM Re: How To Check Catalytic Converters [Re: KayTar]
capt512 Offline
Over the Hill

Registered: 12/22/02
Posts: 2466
Loc: KC, MO
I don't have any loss of power or loss in MPG thats noticeable, and no warm floorboards so that makes me wonder.
_________________________

2001 CVPI - Ex-Kansas Turnpike Authority (Sold)
2000 CVPI - Ex-Kansas Turnpike Authority
2003 Marauder (300A)

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#1780968 - 06/02/09 02:37 PM Re: How To Check Catalytic Converters [Re: capt512]
capt512 Offline
Over the Hill

Registered: 12/22/02
Posts: 2466
Loc: KC, MO
Just got back from the shop (after me not being able to tell from under the car), and they advised me that the drivers side bottom cat is going out (no restriction yet, but rattles).
They quoted me $250 for just the lower (bad) cat to be replaced; or $450 for both on that side.

So I have some questions.

A. The mechanic stated that while he could replace just the lower cat, more than likely the top would be soon behind and then both would have to be replaced. Is this likely...seems as though it might be true?

B. Can I just have him cut off the lower cat on that side and put in a straight pipe? Problems? CEL? ETC?

C. If he does cut the lower one off on the drivers side, should he also cut on off on the passenger side??

D. If I buy my own cats and have them install them, how much should I look to pay for the cats alone? Is there anywhere I can sell the old cats to for money?

E. I found some magnaflow (cheaper than the walkers!) for $214pr at autozone.
1. Would using magnaflow on one side and stock on the other screw stuff up?
2. How much SHOULD I be looking to pay for just labor on that, as I highly doubt I could correctly install them (especially with all the rust on the old ones).

F. Suggestions, opinions, etc.



Edited by capt512 (06/02/09 02:50 PM)
_________________________

2001 CVPI - Ex-Kansas Turnpike Authority (Sold)
2000 CVPI - Ex-Kansas Turnpike Authority
2003 Marauder (300A)

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#1780971 - 06/02/09 02:43 PM Re: How To Check Catalytic Converters [Re: capt512]
mblazakep Offline
Insert Title Here
Poobah

Registered: 01/26/06
Posts: 5346
Loc: Virginia
 Originally Posted By: capt512
Just got back from the shop (after me not being able to tell from under the car), and they advised me that the drivers side bottom cat is going out (no restriction yet, but rattles).
They quoted me $250 for just the lower (bad) cat to be replaced; or $450 for both on that side.

So I have some questions.

A. The mechanic stated that while he could replace just the lower cat, more than likely the top would be soon behind and then both would have to be replaced. Is this likely...seems as though it might be true?

B. Can I just have him cut off the lower cat on that side and put in a straight pipe? Problems? CEL? ETC?

C. If he does cut the lower one off on the drivers side, should he also cut on off on the passenger side??

D. If I buy my own cats and have them install them, how much should I look to pay for the cats alone? Is there anywhere I can sell the old cats to for money?

E. Suggestions, opinions, etc.



A. Somewhat true.
B. Yes. You will get a cat efficency DTC. MIL eliminators or a tune will fix this.
C. Good question, not sure how it would affect the motor, might as well do it.
D. Magnaflow makes direct-fit replacements for half of the factory cost (search there are many threads). There are recyclers who will buy old cats.
E. Find out what caused the cat to go bad.
_________________________
RebelVic2000:"Remember, Panthers are mostly owned by old people who don't understand internet talk."

2000 P71 100k mis. (DC-Metro unit 333) PI intake, Teh MZT, Remote start w/ keyless entry, Heinous RCAs, Bilsteins
1995 Dodge Ram 1500 4x4 318 5spd. 180k mis. SJ class II 3", Accel coil, Hughes Engines plenum kit, 2-1/2" stainless exaust, free flow cat, flowmaster 40 series

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#1780983 - 06/02/09 02:54 PM Re: How To Check Catalytic Converters [Re: mblazakep]
capt512 Offline
Over the Hill

Registered: 12/22/02
Posts: 2466
Loc: KC, MO
Thanks for the quick response! Any suggestions on how to find out what caused the Cat to go bad? I every 6 months to a year have mechanics check the car over for any problems and the car always comes back clean. No CEL or non illuminating CEL problems....


Edited by capt512 (06/02/09 03:18 PM)
_________________________

2001 CVPI - Ex-Kansas Turnpike Authority (Sold)
2000 CVPI - Ex-Kansas Turnpike Authority
2003 Marauder (300A)

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#1781509 - 06/03/09 06:12 AM Re: How To Check Catalytic Converters [Re: capt512]
ford05 Offline
Poobah

Registered: 07/24/08
Posts: 5009
Loc: New Jersey
regarding the CEL, I have a 2000 crown vic hpp. I dont have no O2 sensors after the rear cats so i decieded to remove both of the rear cats to get more sound from my exhuast. It's been alittle over a year now and still no CEL light. So if your O2 sensors are all before the rear cats, then you could delete both rear cats and straight pipe it and save lots of money.

and also, I see that magnaflow has lots of deals on cats on ebay. I beleive i've seen like 160-170 for both cats per side


Edited by ford00 (06/03/09 06:13 AM)
_________________________


(BOC tune for 93 octane/3.73 gears/shift points for j-mod and Marauder MAF sensor) sunroof,ported & polished factory DBW TB and Plenum, 1" TB spacer and 1/2" plenum spacer, rear cat delet with 14" magnaflow mufflers and 3.5" rolled edge tips, custom gauges from Scott Hrbacek at www.customgaugefaces.com, LED interior bulbs, reverse and brake light bulbs, custom SPORT decal for 3rd brake light with led bulb, JLT cone filter, 06 p71 intake tube, 5% tints, 09 200amp alternator, Marauder front and rear swaybar and moog links, turn signal mod, glowshift rpm and volt gauge, motive cross and drilled front/rear rotors with ceramic pads, steeda underdrive pullys, crystal clear headlights and corners and complete interior changed from light flint to dark charcoal/midnight black with a very loud sound system

coming mods:
2.5" exhaust waiting to be installed

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#1781617 - 06/03/09 10:08 AM Re: How To Check Catalytic Converters [Re: ford05]
capt512 Offline
Over the Hill

Registered: 12/22/02
Posts: 2466
Loc: KC, MO
So I have been looking at either removing the two rears, straight piping and if I need getting a MIL eliminator; or the magnaflow.

Would removing the two rears be legal though? I am not trying to do an illegal modification (*moderators). Just didn't know if I could remove the two rears as long as the front stayed on. I like the stock sound and wasn't neccesarily looking to wake things up, however $450 is alot in this economy...especially since I have lots of other stuff at the same time, brakes, tires, etc.

I found the Magnaflow front and rear for $215, but then I would have to have it installed since, I doubt I would succesfully get the old ones off without breaking something, since everything is pretty rusted on. $300 installed wouldn't bother me too much, but $450 is pushing it.
Then again if I was able to install it $215 wouldn't be bad at all, especially since I would then sell the old cats.
_________________________

2001 CVPI - Ex-Kansas Turnpike Authority (Sold)
2000 CVPI - Ex-Kansas Turnpike Authority
2003 Marauder (300A)

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#1781765 - 06/03/09 01:03 PM Re: How To Check Catalytic Converters [Re: capt512]
JoeVic Offline
Member

Registered: 02/03/03
Posts: 105
I just went through the same thing on my '04. Driver side rear cat started making noise. I was still covered under the 8 year/80,000 mile emmissions warranty.

One dealer said they wouldn't, the other fixed it up with no problems. It was covered under a Technical Service Bulletin (TSB 06-9-10) so I think Ford knows that there is an issue with some of their cats.

BTW they only replaced the one cat by cutting it off and then welding a new one to the existing pipe from the light off cat.
_________________________
2004 CVPI Black Street Appearance Package

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#1783501 - 06/05/09 04:27 PM Re: How To Check Catalytic Converters [Re: JoeVic]
capt512 Offline
Over the Hill

Registered: 12/22/02
Posts: 2466
Loc: KC, MO
Well I went on AllDataDIY today (BTW if you don't have a membership there, you NEED to get one! That site is awesome!!) and noticed Ford did a recall on 01 vics because bad converters were put in, but seeing as how it was never done, and I can't read the part numbers on the old cat, I will just assume I couldn't luck out with the recall.

So my plan is to attempt to replace the cats myself, I found the magnaflows are sold for $215 at autozone and plan to buy them. I would like to replace them myself...(or atleast attempt to) but need to know what to get.

Here is the link
Magnaflow Catalytic Converters - Autozone part # 23328

I have an impact gun with a 1/2" socket (appears to be the size of the bolt heads?), jack stands, a jack, a breaker bar...
What other parts will I need beside the catalytic converters...gaskets? suggested penetrating oils? since I can easily see the bolts breaking...and don't really want to reinstall rusted bolts; will the new cats come with bolts, or is there a pack I can get, or do I just need to go to the hardware store?

Thanks!
_________________________

2001 CVPI - Ex-Kansas Turnpike Authority (Sold)
2000 CVPI - Ex-Kansas Turnpike Authority
2003 Marauder (300A)

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