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Unread 09-16-2011, 01:33 PM   #1
bamasteeler
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1980 CJ7 
 
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There is a spring loaded valve on bottom of my intake/exhaust manifold assembly. I know I read about it before but can't find it here nor in maintenance manual. Thanks

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1980 Jeep CJ7
AMC 258, T176, D300,
AMC 20 REAR, D30 FRONT

1999 XJ CLASSIC
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Unread 09-16-2011, 01:42 PM   #2
SgtJensen
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I beleive that is the infamous Gremlin Gate....that's where the gremlins get in your rig and start messing with stuff.....LOL...couldn't help myself...

On a sidenote though, I have no idea.
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Unread 09-16-2011, 01:52 PM   #3
hp_lovecraft
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Its the intake heater on the pre 1981 engines. It diverts heat from the exhaust manifold onto the intake manifold during startup.
That spring is temp sensitive, and closes the valve as it warms up.

Mine broke off years ago.... I just leave it in the "open" position.
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Unread 09-16-2011, 02:04 PM   #4
bamasteeler
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Quote:
Originally Posted by hp_lovecraft
Its the intake heater on the pre 1981 engines. It diverts heat from the exhaust manifold onto the intake manifold during startup.
That spring is temp sensitive, and closes the valve as it warms up.

Mine broke off years ago.... I just leave it in the "open" position.
Which one is the open position? Mine seems to move as I rev engine and then goes back when throttle is released.

Would it cause any kind of problems always open, especially once engine is warm I.e. Rough idling or
Inconsistent idling?
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AMC 258, T176, D300,
AMC 20 REAR, D30 FRONT

1999 XJ CLASSIC
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Unread 09-16-2011, 02:12 PM   #5
jeepnj79
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It heats the bottom of the intake where the carb is attached to. I just ventured into the dark part of my garage and looked at my old intake. If you turn the spring side with the two tabs, (the opposite side of the bigger paddle looking part) counterclockwise it will push the exhaust gas out the tailpipe. Clockwise, it pushes it up against the intake to warm it. Hope that helps a little.
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Unread 09-16-2011, 02:13 PM   #6
scrapman
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.

Last edited by scrapman; 09-16-2011 at 02:17 PM.. Reason: oops!
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Unread 09-16-2011, 02:24 PM   #7
bamasteeler
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Quote:
Originally Posted by jeepnj79
It heats the bottom of the intake where the carb is attached to. I just ventured into the dark part of my garage and looked at my old intake. If you turn the spring side with the two tabs, (the opposite side of the bigger paddle looking part) counterclockwise it will push the exhaust gas out the tailpipe. Clockwise, it pushes it up against the intake to warm it. Hope that helps a little.
Thanks will check mine this weekend
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AMC 258, T176, D300,
AMC 20 REAR, D30 FRONT

1999 XJ CLASSIC
RC 3" front AAL rear
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Unread 09-16-2011, 02:24 PM   #8
bamasteeler
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Quote:
Originally Posted by SgtJensen
I beleive that is the infamous Gremlin Gate....that's where the gremlins get in your rig and start messing with stuff.....LOL...couldn't help myself...

On a sidenote though, I have no idea.
I KNEW IT!!!!!! lol
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AMC 258, T176, D300,
AMC 20 REAR, D30 FRONT

1999 XJ CLASSIC
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Unread 09-16-2011, 07:16 PM   #9
ejeeperguy
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I just had to pull the gremlins out of my rig . The little spring on the side there snapped and locked the valve shut. I thought my engine was going to blow up with all the noise, sputtering and whatnot going on.When I safety wired it open ,low and behold it ran fine again. Think of it as a damper in a fireplace.Closed no exhaust gas leaving meaning no intake air coming in and a whole lot of unburned gas going nowhere fast.
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Unread 09-16-2011, 07:46 PM   #10
CALOcruiser
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Quote:
Originally Posted by ejeeperguy
I just had to pull the gremlins out of my rig . The little spring on the side there snapped and locked the valve shut. I thought my engine was going to blow up with all the noise, sputtering and whatnot going on.When I safety wired it open ,low and behold it ran fine again. Think of it as a damper in a fireplace.Closed no exhaust gas leaving meaning no intake air coming in and a whole lot of unburned gas going nowhere fast.
No offense, but this isn't exactly true. It is like a damper, but does not restrict exhaust from leaving or change intake air. As jeepnj79 said, it heats the bottom of the intake. It warms the fuel/air mixture in cold weather to help it run cold. The spring is heat sensitive, closing after the engine is warm and diverting air from under the intake.

Unless it was really cold during the experiment, and/or the motor was just started, moving the damper should not change the idle. For best atomization of the fuel/air mixture, you don't really want a super-heated intake. It changes the density of the air. Therefore, I would close the damper.

I switched to headers and kept the stock intake. I have no problems without the heated intake, then again I haven't run in really cold weather in NC yet. I might see some cold start issues, but shouldn't be as severe as mentioned above. Before I removed the exhaust manifold, mine was stuck open with the carter bbd with no problems. Good luck. Sounds like you may have more gremlins.
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Unread 09-16-2011, 07:54 PM   #11
ejeeperguy
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CAL
Same back at you buddy no offense.I just know that since wiring it all the way open my rig doesn't run like it was going to flip over and die.And what cold weather are you talking about in NC.We in Rhode Island don't even wear socks unless there is 4 inches of snow on the ground.
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Unread 09-16-2011, 08:36 PM   #12
CALOcruiser
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Quote:
Originally Posted by ejeeperguy
CAL
Same back at you buddy no offense.I just know that since wiring it all the way open my rig doesn't run like it was going to flip over and die.And what cold weather are you talking about in NC.We in Rhode Island don't even wear socks unless there is 4 inches of snow on the ground.
LOL. your feet probably handle the cold better than that Carter does. I actually mistyped earlier. Mine was stuck closed. I can't argue with what you observed, I just don't understand why it would have such a dramatic effect. Was it winter when the spring broke?
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Unread 09-16-2011, 09:51 PM   #13
1986cj
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google GM heat riser
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Unread 09-17-2011, 10:46 PM   #14
ejeeperguy
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Cal
It was July and 95degrees.Like I said It has been running like a champ again.The carter by the way is like my wife...between 70 and 73 degrees is fine everything else is too cold or to hot.
I have had this Jeep since 94,and still don't know how I ended up with a one barrel carter in it.Every other 82 i saw stock was a2bbl.Iwould change out to a better system,but the morgage wants to be paid and the boy likes to eat.So go figure. I did put in a glass pack muffler in which helps get the thing breathing good and it sounds badass.
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Unread 09-18-2011, 09:11 AM   #15
bamasteeler
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So anyone got pics of what open looks like without having to disassemble everything to see
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