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Cracked exhaust manifold

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  #1  
Old 06-04-2012, 12:36 AM
TGoodwin TGoodwin is offline
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Default Cracked exhaust manifold

Hello,

I recently started getting an intermittant check engine light. The code came back as a #8 cylinder misfire. Looking over the engine I ran across this.

This is a 98 Dodge Ram 1500 5.9l Magnum. Is this a common problem on this model?
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Last edited by TGoodwin; 06-04-2012 at 12:42 AM..
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  #2  
Old 06-04-2012, 12:42 AM
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Ham Bone Ham Bone is online now
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That's a great excuse to get some good shorty headers and a new, better flowing y-pipe.

You can thank me later
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  #3  
Old 06-04-2012, 01:39 AM
SilverSS SilverSS is offline
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Lol yep good excuse for headers! Not a common problem as far as I know. Mine are fine. If you don't want to get headers an exhaust shop should be able to weld it cheap.
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Old 06-04-2012, 02:33 AM
TGoodwin TGoodwin is offline
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Default Headers

LOL

Yeah I already changed the stock manifolds out for some headers.

http://i1068.photobucket.com/albums/...0606200110.jpg

Last edited by TGoodwin; 06-15-2012 at 02:06 AM..
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  #5  
Old 06-04-2012, 09:38 AM
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You need to adress the y-pipe if you want to see any serious performance gains. It's rather restrictive
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Old 06-08-2012, 08:17 PM
TGoodwin TGoodwin is offline
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Well I went ahead and bought a Flowmaster cat-back, plenum repair kit, new NGK O2 sensor, MSD 8.5 plug wires, NGK iridium plugs, Harland Sharp 1.7 rockers and Superchips programer to go with the new Gibson headers. So I guess I will keep the truck for a while. :-)

http://i1068.photobucket.com/albums/...0606200158.jpg

Last edited by TGoodwin; 06-15-2012 at 02:08 AM..
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  #7  
Old 06-08-2012, 08:23 PM
TGoodwin TGoodwin is offline
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Default Y pipe

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Originally Posted by Ham Bone View Post
You need to adress the y-pipe if you want to see any serious performance gains. It's rather restrictive
So I see a bunch of Y-pipes. How do I figure out which one is better flowing?

Thanks

Ted
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  #8  
Old 06-08-2012, 08:51 PM
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The off-road y-pipe (no cat) flows best. If you can get away with that where you are, go for that one.

Otherwise, post links to the candidates.
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Old 06-09-2012, 04:44 AM
ReadRam ReadRam is offline
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OP were there any other symptoms from the cracked exhaust manifold as i get intermittent cel #8 misfire?
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  #10  
Old 06-09-2012, 10:27 AM
TGoodwin TGoodwin is offline
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Quote:
Originally Posted by ReadRam View Post
OP were there any other symptoms from the cracked exhaust manifold as i get intermittent cel #8 misfire?
Heavy pinging under load. Slugish performance. Rattle sound coming from the cat sometimes during idle. Oil usage with no external leaks to account for it. The #8 plug was not excessively fouled compared to the other cylinders but the plugs were worn and due for replacement.

The truck is in very good condition with 108k miles on it.

I do not drive the truck daily to work and am doing a little bit at a time. I now have the plugs, wires, headers, and rockers installed. I hope to get time to do the intake kit install today.
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Old 06-09-2012, 10:29 AM
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Quote:
Originally Posted by HeyYou View Post
The off-road y-pipe (no cat) flows best. If you can get away with that where you are, go for that one.

Otherwise, post links to the candidates.
I dont think I can get away with eliminating the cat.
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  #12  
Old 06-09-2012, 01:16 PM
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Default rockers installed

Drove it today...It seems to have more power and gets up a little quicker. I did not hear any pinging even at WOT but I have 97 octane fuel and seafoam in the fuel.

http://i1068.photobucket.com/albums/...0607210150.jpg

Last edited by TGoodwin; 06-15-2012 at 02:12 AM..
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  #13  
Old 06-09-2012, 02:00 PM
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any issue with manifold bolts?
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  #14  
Old 06-09-2012, 02:50 PM
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Quote:
Originally Posted by TGoodwin View Post
Heavy pinging under load. Slugish performance. Rattle sound coming from the cat sometimes during idle. Oil usage with no external leaks to account for it. The #8 plug was not excessively fouled compared to the other cylinders but the plugs were worn and due for replacement.

The truck is in very good condition with 108k miles on it.

I do not drive the truck daily to work and am doing a little bit at a time. I now have the plugs, wires, headers, and rockers installed. I hope to get time to do the intake kit install today.

Can;t believe this has not been brought up yet - Have you checked the plenum gasket yet? This will also cause such things a #8 misfire, pinging, and a range of other ugly issues.
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Old 06-09-2012, 02:56 PM
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that was on his list-o-repairs from page 1
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  #16  
Old 06-09-2012, 02:58 PM
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well he did say he got the plenum repair kit.
i would ditch the superchips was it, and get an sct from hemifever.
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  #17  
Old 06-09-2012, 03:13 PM
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Quote:
Originally Posted by dnfd737 View Post
that was on his list-o-repairs from page 1
I missed that as I did not re-read form beginning. (crazy week at the office and basballe thing going on.....) OP may be on the way to getting it resolved then.
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  #18  
Old 06-10-2012, 02:43 AM
TGoodwin TGoodwin is offline
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Default bolts

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Originally Posted by dnfd737 View Post
any issue with manifold bolts?
No problems they came right out of the heads. I cleaned up the threads with a tap and applied anti-seize to the new header bolts.

I installed the flowmaster catback today. I also have a new y-pipe/cat on the way. I was going to do the plenum kit but did not have time. Maybe next weekend as I am working tomarrow.
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  #19  
Old 06-10-2012, 09:45 AM
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Where did you get 97 Octane?
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  #20  
Old 06-10-2012, 10:15 AM
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Quote:
Originally Posted by SilverSS View Post
Where did you get 97 Octane?
Sorry was typo.....I meant to say 168 octane.
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Old 06-10-2012, 10:15 AM
 
 
 
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