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Unread 06-25-2013, 02:30 PM   #1
sxysouthtx
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engine temp after new exhaust manifold

So I just installed a new exhaust manifold. I more hear a ticking noise when apply a load while driving. It sounds like a valve, but I doubt it. Also, my temp while cruising is a steady 210. Before the new exhaust, it would be lower. I know 210 is the prime temp. I'm thinking the motor is running leaner now causing the temp to rise to proper operating temperature. But I can't be sure. It just scares me to see the temp jump up like that right after I changed the exhaust. Any input?

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Unread 06-25-2013, 02:57 PM   #2
jbolty
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I would bet you have a leak. Either the new manifold is cracked or the torque sequence was not followed.
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Unread 06-25-2013, 06:09 PM   #3
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The manifold bolts might have wiggled loose after they got heated. Try to tighten them up.
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Unread 06-25-2013, 06:56 PM   #4
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Have you checked for any codes? You may need a new O2 sensor if you had a bad gasket for a time.

But I agree with the other guys, retorque the manifold bolts.
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Unread 06-25-2013, 07:27 PM   #5
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Ticking can absolutely be an exhaust leak. What kind of gasket did you use? Check all the bolts make sure they're snugged down. You may have buggered up the gasket during the install. I've done that once myself....

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Unread 06-25-2013, 08:14 PM   #6
sxysouthtx
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Thanks for the replies. I don't think I trashed the gasket. But I didn't torque the manifold in any particular order. It started to downpoor on me, so I had to finish up. When I'm at idle or anything under 60, it runs at the line under 210.
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Unread 06-26-2013, 03:22 AM   #7
sxysouthtx
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Okay, I originally typed this up on my phone at work. Maybe I can be a little more clear with the computer. It seems to drive better. (maybe it's just a placebo effect) Prior to the new manifold the temp never went above the mark just below 210 on the gauge. Now it just hovers a mm away from 210. Now, I'm not complaining. Just bothersome. I can't smell any emissions like the previous manifold. It's just the ticking that is concerning. I can't achieve the noise while parked with no load applied. I must be driving with "weight" behind the motor. I was thinking my fuel ratio had improved to a leaner mixture causing slightly higher combustion temperatures. But I doubt this is the issue. I just don't know how I either misaligned the exhaust manifold, which I would that would be impossible, or maybe the intake is a tad off. But I don't think that is possible. I would like to at least re-torque the bolts like previously mentioned. Does anyone have a diagram? I torqued the bolts at 24 lbs:Sq". I'm that is wrong as well. Funny thing, while cruising down the highway at 60-70, purrs just fine. No noise. Maybe the lack of load.
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Unread 06-26-2013, 06:27 AM   #8
UZI4U
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The tick is an exhaust leak. Your gasket or manifold is buggered. Take it off and try it again following the torque specs and sequence.
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Unread 06-26-2013, 08:21 AM   #9
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If you don't follow the proper torque specs and sequence you will get leaks and early gasket failure 90% of the time.
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Unread 06-26-2013, 01:29 PM   #10
UZI4U
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Make sure you get a new exhaust donut where it connects to the head pipe.
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Unread 06-26-2013, 02:08 PM   #11
sxysouthtx
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I just went out and bought a new felpro gasket. I think the ebay gasket that cask with the manifold was just trash to begin with. Looks like my Sunday is going to spent.
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Unread 06-26-2013, 08:22 PM   #12
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It's an exhaust leak. You just described my eternal hell. I have a 4.2 that doesn't use a gasket in the down pipe and it wont properly seat no matter what I try. Best trick ever is put a shop-vac on blow and shove it up the tailpipe AFTER THE ENGINE COOLS COMPLETELY. Spray all exhaust junctions and gasket areas with bubbly, soapy water. I actually use my kids bubble crap for best results.
You'll be shocked how many exhaust leaks you have
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Unread 06-26-2013, 08:30 PM   #13
UZI4U
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Quote:
Originally Posted by sxysouthtx View Post
I just went out and bought a new felpro gasket. I think the ebay gasket that cask with the manifold was just trash to begin with. Looks like my Sunday is going to spent.
If you take the exhaust manifold completely off, shoot it with some high temp silver. Make sure you get a donut.
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Unread 06-26-2013, 09:38 PM   #14
sxysouthtx
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I have a new donut. I used the copper stuff last time.
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