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Trapping vechile question #7225912
03/24/21 11:30 PM
03/24/21 11:30 PM
Joined: Mar 2008
Posts: 4,231
n.e, iowa
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coonman220 Offline OP
trapper
coonman220  Offline OP
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n.e, iowa
My cast iron exhaust manifold with converter integrated on it is crack, a common gm problem on 4 cyl, manifold under warrantee, had replaced last summer, wondering if anyone knows if ur cat was plug which cause a crack, which is probly not plug up, but if was cat plug up, would that likrly for sure trip a code ? My check engine lite works an is not on

Re: Trapping vechile question [Re: coonman220] #7225935
03/25/21 01:29 AM
03/25/21 01:29 AM
Joined: Aug 2020
Posts: 767
Alaska
T
Twolines Offline
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Alaska
If the cat was plugged Iíd assume it would throw a code eventually. Iím no vechile mechanic but it should have some sensors before and after to assess exhaust gasses and tune itself accordingly.

Re: Trapping vechile question [Re: coonman220] #7225941
03/25/21 04:14 AM
03/25/21 04:14 AM
Joined: Dec 2006
Posts: 2,864
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Wright Brothers Offline
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Echo Did you check for broken motor mounts?

Echo Did you check for broken trans mounts?

Echo Did you check for broken trans mounts?

Echo Did you check for broken motor mounts?

Last edited by Wright Brothers; 03/25/21 04:16 AM.




Re: Trapping vechile question [Re: coonman220] #7225976
03/25/21 06:49 AM
03/25/21 06:49 AM
Joined: Oct 2009
Posts: 2,889
east central WI
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k snow Offline
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k snow  Offline
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K

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Posts: 2,889
east central WI
Yes, a plugged catalytic convertor will trigger an engine code. Quite often a plugged convertor will also cause a VERY noticeable decrease in engine performance and fuel economy.

Re: Trapping vechile question [Re: coonman220] #7225980
03/25/21 06:57 AM
03/25/21 06:57 AM
Joined: Dec 2006
Posts: 20,599
williamsburg ks
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danny clifton Online content
"Grumpy Old Man"
danny clifton  Online Content
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Posts: 20,599
williamsburg ks
If your catalytic converter was plugged up you would be losing power. That crack was likely the result of getting a hot piece of cast wet crossing a creek or something


Those who would give up essential liberty, to purchase a little temporary safety, deserve neither liberty nor safety. Benjamin Franklin (1706-1790)
Re: Trapping vechile question [Re: coonman220] #7226022
03/25/21 07:55 AM
03/25/21 07:55 AM
Joined: Feb 2018
Posts: 793
Norborne MO
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BBarnes Offline
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Posts: 793
Norborne MO
Plugged cat will throw a code however you will notice a reduction in power first. Cracked manifold can be caused by the manifold cooling to fast like snow or water splashing up in there or washing the engine while the manifold is hot. The manifold can get very hot if the cat is plugged however you should notice a power issue first. Iíve seen them plugged so bad that the vehicle would hardly pull itself down the road.


B

Last edited by BBarnes; 03/25/21 07:56 AM.
Re: Trapping vechile question [Re: BBarnes] #7226028
03/25/21 08:05 AM
03/25/21 08:05 AM
Joined: Oct 2009
Posts: 2,889
east central WI
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k snow Offline
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k snow  Offline
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K

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Posts: 2,889
east central WI
Originally Posted by BBarnes
Plugged cat will throw a code however you will notice a reduction in power first. Cracked manifold can be caused by the manifold cooling to fast like snow or water splashing up in there or washing the engine while the manifold is hot. The manifold can get very hot if the cat is plugged however you should notice a power issue first. Iíve seen them plugged so bad that the vehicle would hardly pull itself down the road.


B


We had quite a few 99-00 GM SUV's that would get plugged cats. You could just about walk faster than those things. Drop the Y-pipe off and the ran like race trucks. Fun diagnosis.

Re: Trapping vechile question [Re: k snow] #7226046
03/25/21 08:26 AM
03/25/21 08:26 AM
Joined: Feb 2020
Posts: 1,502
Missouri
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WhiteTrash 88 Offline
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Missouri
Put a hooker header on that little jewel. Get rid of cat converter. Run 3 inch pipe into a turbo thrush mooffler and out the back. Then let that pig eat. Oh yeh, put tape over check engine light on the dash. laugh

Re: Trapping vechile question [Re: coonman220] #7226102
03/25/21 10:05 AM
03/25/21 10:05 AM
Joined: Mar 2008
Posts: 4,231
n.e, iowa
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coonman220 Offline OP
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Not Cross Creek, must not been bad converter

Re: Trapping vechile question [Re: coonman220] #7226106
03/25/21 10:08 AM
03/25/21 10:08 AM
Joined: Oct 2009
Posts: 2,889
east central WI
K
k snow Offline
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k snow  Offline
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K

Joined: Oct 2009
Posts: 2,889
east central WI
I've seen plenty of cracked manifolds that had nothing to do with temperature shock. I'd blame cheap steel castings.

Re: Trapping vechile question [Re: coonman220] #7226176
03/25/21 12:10 PM
03/25/21 12:10 PM
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Posts: 12,383
pa
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hippie Offline
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Drill the bolt holes out a size bigger on all but the two middle ones.

Re: Trapping vechile question [Re: coonman220] #7226361
03/25/21 05:18 PM
03/25/21 05:18 PM
Joined: Dec 2006
Posts: 5,602
Coldspring Texas
Savell Offline
"Wilbur"
Savell  Offline
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Coldspring Texas
... get full coverage, a match and a gallon of gas then have a vechile roast


Insert profound nonsense here
Re: Trapping vechile question [Re: Savell] #7226575
03/25/21 09:11 PM
03/25/21 09:11 PM
Joined: Dec 2006
Posts: 1,573
Lufkin, Tx.
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Lufkin Trapper Offline
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Lufkin, Tx.
Originally Posted by Savell
... get full coverage, a match and a gallon of gas then have a vechile roast

Not legal, tater.lol


Billy
Member # 16.
Re: Trapping vechile question [Re: Lufkin Trapper] #7226606
03/25/21 09:38 PM
03/25/21 09:38 PM
Joined: Dec 2006
Posts: 1,667
iowa
bankrunner Offline
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bankrunner  Offline
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iowa
Originally Posted by Lufkin Trapper
Originally Posted by Savell
... get full coverage, a match and a gallon of gas then have a vechile roast

Not legal, tater.lol


Locate next riot area and park truck, hope for the best. Place Trump sticker on it.

Re: Trapping vechile question [Re: coonman220] #7232793
04/01/21 05:50 PM
04/01/21 05:50 PM
Joined: Mar 2008
Posts: 4,231
n.e, iowa
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coonman220 Offline OP
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So manifold bad an replace today, not sure how many valves in I 4 on inline Colorado with dial overhead cam, but kinda twish noise on tick noise for months an months always same out tailpipe I hear, exhaust look decent I think, so could that be valves at 237 k? How tell if symptoms, not sure what call shop tomma ask after free warrnty replacement on manifold as start tick him off, unbelievable cost at shop though , what bad valve symptoms an what happen ? No check engine lite on

Re: Trapping vechile question [Re: coonman220] #7232796
04/01/21 05:53 PM
04/01/21 05:53 PM
Joined: Oct 2013
Posts: 6,896
East of the Mason-Dixon Line
DelawareRob Offline
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East of the Mason-Dixon Line
Great! Sounds fixed for 100k miles.


You don't rise to the occasion, you fall to the level of your training.

Semper Paratus
Re: Trapping vechile question [Re: coonman220] #7232821
04/01/21 06:27 PM
04/01/21 06:27 PM
Joined: Mar 2008
Posts: 4,231
n.e, iowa
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coonman220 Offline OP
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Unless slight leak muffler, he look once shop but not much an say look decent unless small leak, a diesel tech other job thought he say that a plug muffler rare, ? I hope not, blow new manifold apart crack, I wouldn't think that be plug muffler

Re: Trapping vechile question [Re: coonman220] #7232828
04/01/21 06:38 PM
04/01/21 06:38 PM
Joined: Oct 2013
Posts: 6,896
East of the Mason-Dixon Line
DelawareRob Offline
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East of the Mason-Dixon Line
Iím sure youíll figure out something wrong with it Dave.

I hope it runs forever for you.


You don't rise to the occasion, you fall to the level of your training.

Semper Paratus
Re: Trapping vechile question [Re: coonman220] #7232832
04/01/21 06:46 PM
04/01/21 06:46 PM
Joined: Sep 2010
Posts: 1,308
MI.
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Feedinggrounds Offline
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Posts: 1,308
MI.
Are you putting additives in your fuel???? Plugged cat converters are kinda rare. The ones that do plug or restrict are due to ignoring for a long time, other problems. Then adding crazy snake oil fix it stuff...Hippie had a legit idea. Cast iron manifolds expand and contract, a lot. when the bolts don't allow movement they crack. I remember the small block Chevy V8 manifolds in the 90's that when unbolted required spreader tools to bolt back on. Or drilling out the holes and at times both drills and spreaders. In Michigan Colorado's fall apart from rust before the manifolds crack...


your only allowed so many sunrises... I aim to see every one of them!
Re: Trapping vechile question [Re: coonman220] #7232839
04/01/21 06:55 PM
04/01/21 06:55 PM
Joined: Mar 2008
Posts: 4,231
n.e, iowa
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coonman220 Offline OP
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No additives any sort ever, 2nd aftermarket manifold, 1 last 4 years, this one last 6 months, I just ask disel tech other job an say if muffler plug, not blow manifold or crack it, ? probly small leak muffler ? I considered if happen be plug muffler that blow out new converter bfore shop in couple months when in service, unless noisevis valves go back, been hear lil noise exhaust months, manifold crack recently an replaced now , shop say have had problems with some manifolds on 4 cyl , not sure how many valves in this motor

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