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Unread 07-01-2004, 06:14 AM   #1
cygnus3978
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Join Date: Aug 2001
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EGR valve on TJ?

I had a friend fail inspection on her car(95 camaro), specifically the NO part and the shops replaced the EGR valve(Exhaust Gas Recirculation).
I had never heard of this before so I researched it and found that it acutally takes exhaust gasses and re-inserts them into the cylinders to lower the burning temperature and help the NO pass through the system unburned and prevent it from picking up other atoms and becoming smog...basically.
The science I have may be a little off, but the principle is the same.

Well I got to thinking about where the TJ EGR valve is....and I CAN'T find it on my jeep or in the FSM for that matter as well.

DO TJ's have an EGR valve? If so where...and if not, what do we use in place of the EGR.

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Unread 07-01-2004, 06:32 AM   #2
AjRagno
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I don't think it does.

I had one on my F-150, which was problematic because it sent so much gunk into the intake manifold, but can't find it on the 4.0L or in the manual. Either we don't need it or DC decided to allow the cats to do their job and clog sooner.
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Unread 07-01-2004, 06:58 AM   #3
cygnus3978
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Quote:
Originally Posted by AjRagno
I don't think it does.

I had one on my F-150, which was problematic because it sent so much gunk into the intake manifold, but can't find it on the 4.0L or in the manual. Either we don't need it or DC decided to allow the cats to do their job and clog sooner.
Well Cat converters only take care of hydro carbons, not the Nitric Oxide. Unless DC found a way to lower combustion chamber temps without an EGR valve the Cat would do nothing with this process.
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Unread 07-01-2004, 07:22 AM   #4
AjRagno
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Quote:
Originally Posted by cygnus3978
Well Cat converters only take care of hydro carbons, not the Nitric Oxide. Unless DC found a way to lower combustion chamber temps without an EGR valve the Cat would do nothing with this process.
My point is that all of the carbon build up I found in the intake manifold of my F-150's engine needs to go somewhere if the EGR is not redirecting this back into the engine. If these gases do not go through an EGR system, then they are definitely going into the cats and collecting there.
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Unread 07-01-2004, 11:08 AM   #5
Pakrjeep
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Quote:
Originally Posted by cygnus3978
Well Cat converters only take care of hydro carbons, not the Nitric Oxide. Unless DC found a way to lower combustion chamber temps without an EGR valve the Cat would do nothing with this process.

That's not totally right--the catalytic converter, if it is a 3 way cat, it absolutely helps eliminate NOx. In fact, the TWC is the most efficient method for getting rid of NOx emissions. If the test failed on NOx, then it can ONLY be the Cat converter or the EGR. No other emissions systems on a vehicle really help with NOx other than those two.
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Last edited by Pakrjeep; 07-01-2004 at 11:16 AM..
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