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Unread 05-23-2011, 08:50 PM   #1
res0n0xg
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94 Grand Cherokee 4.0L - Just purchased, died once on the way home

1994 Grand Cherokee 4.0L with 142K, picked it up for 1700, drove it for about 20 minutes around town/highway, no stuttering, no rough idle. Drove fine all the way home, until I was at a stop light near my house, just randomly died, barely could even tell, no choking/bucking or anything.

Any ideas? I'm BRAND NEW to Jeeps, have had newer cars most of my life, so maintenance wise, I'm wanting to learn.


What would be the standard things to look at/replace?


Edit, is there a "how to" for newbies/ beginners that give basic run downs on how to change some of the routine maintenance items?

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Unread 05-24-2011, 09:19 AM   #2
leofanti
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maybe the idler air controller ( iac ) . i had a similar problem as my jeep drove great throughout all rpm ranges, then one morning when i was about halfway to work, it stalled at a red light. she started back up and had a rough idle so i came on here and was pointed to the iac. after putting a new one in, never had a problem since. so ill give you the same advice given to me, pull your throttle body and clean it real good, test and replace if necessary the tps and look at the condition of your iac. its a good place to start. good luck!!
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Unread 05-24-2011, 09:28 AM   #3
Sclay115
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Does it now have the CEL illuminated? If so, pull the code(s), sounds like exactly what mine did, my issue was the crank sensor.

Steve
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Unread 05-24-2011, 12:13 PM   #4
classicmetalman
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Congrats on your buy. Yeah, pull the codes as mentioned earlier. Use the key on/off method if you don't have a reader.
Tune up and fluid change would be a good starting point for your new rig.
Unless you plan on taking it to a garage every time something pops up, I'd probably invest in a shop manual (Haynes or Chiltons) or even a FSM, and a multimeter.
Post up with your results (codes/no codes) and go from there.
HTH
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I say you should still hit something just to let it know you mean business, or shake a hammer at it in a menacing fashion
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Unread 05-24-2011, 02:19 PM   #5
res0n0xg
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Ok, update, the car just failed inspection, too much N0x, just by a little, this car has been sitting some, and only 1/8th tank of gas..


Heres the kicker, luckily was pulling onto my street, then it started sputtering like it was out of gas, RPM's bouncing for a few seconds, then full shutoff, so lucikly coasted into my driveway, lol.


The car turns over fine, but will not start now, I added about a gallon of gas and it didn't make a difference, would that be not enough to get it going if the tank is dry?

*Note that the gas light all of a sudden came on right before it was sputtering on me* There was no gas light on previously and it was not near the E, still showed just shy of 1/8th tank, maybe the fuel gage isn't 100% accurate?

There are no codes, no check engine lights.


HELP! Already a nightmare...
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Unread 05-24-2011, 02:25 PM   #6
Midtown
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Based upon my recent experience clean throttle body manifold and idle air control valve. If valve is very long try to push it in. Try Jeep. If not> replace idle air valve. Try Jeep.

Also might want to seafoam jeep and get new high octane gas. Change oil after 200 miles or so or less after seafoaming.

All info for this can be found by searching here. Even if this doesn't help your problem it will still be good for your jeep.
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Unread 05-24-2011, 02:35 PM   #7
Candymancan
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Sounds like the engine is dirty or something.. If its been sitting for awhile, it might need to be cleaned like everyone is saying... Clean the throttle body and stuff
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Unread 05-24-2011, 02:44 PM   #8
Obie95Sahara
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Quote:
Originally Posted by Midtown View Post
Based upon my recent experience clean throttle body manifold and idle air control valve. If valve is very long try to push it in. Try Jeep. If not> replace idle air valve. Try Jeep.

Also might want to seafoam jeep and get new high octane gas. Change oil after 200 miles or so or less after seafoaming.

All info for this can be found by searching here. Even if this doesn't help your problem it will still be good for your jeep.
I wouldn't try to push the valve in on the IAC, you could damage it. Just clean that & the throttle body real good and then see what happens.
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Unread 05-24-2011, 02:56 PM   #9
res0n0xg
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forgive my ignorance, where is the IAC? This is my first car I'm really looking at doing most "light" work myself....
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Unread 05-24-2011, 03:34 PM   #10
sadass
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IAC stands for Idle Air Control, It is on the throttle body and it regulates how much air enters during Idle when the butter fly valve is closed . Idle is controlled by the IAC piston like valve to regulate air due to change in altitude and temperature like a choke.
it s a common problem easy to resolve, There are several good write ups on here about how to. normally you can just clean it. still not hard or expensive to replace
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Unread 05-24-2011, 04:47 PM   #11
Candymancan
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Its a black little box like thing attached to the throttle body behind it by 2 screws.. Unscrew it and pull it out and it has a nipple on it.. Clean that gently... not rough and then take the air intake off and open the butterfly's of the throttle body by pushing the throttle lever down and clean the inside of that also..


Also depending on how long this really has been sitting " months years ect" 1 gallon of gas wont be enough if it had like half a tank or something.... put in 93 and put in more then 1 gallon..


Its quiet possible the fuel pump may not be working right either
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Unread 05-24-2011, 04:48 PM   #12
classicmetalman
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Quote:
Originally Posted by Obie95Sahara View Post
I wouldn't try to push the valve in on the IAC, you could damage it. Just clean that & the throttle body real good and then see what happens.
X2 Give this a read
http://www.jeepforum.com/forum/f13/z...ml#post7415359

I'd think twice about putting Seafoam in the crankcase, if you have a leak, it could get worse. I'd just Seafoam thru the intake/throttle body.
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93 Laredo 4.0
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Quote:
Originally Posted by murphydajeep View Post
I say you should still hit something just to let it know you mean business, or shake a hammer at it in a menacing fashion
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Unread 05-25-2011, 01:12 PM   #13
res0n0xg
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Ok, just cleaned the throttle body (did not take it off) but cleaned inside, opened the plate, seems much better now, although I'm skeptical it will help.

In terms of the IAC, I took off the module right behind the TB that is held in with two screws, I saw no nipple, refer to the picture below, is it the unplugged module or the module that's still plugged in?



Also, while working/taking that off a hose coming from the top of the motor knocked loose, although after taking a look at it, it was clearly already broken, what is this below?

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Unread 05-25-2011, 01:25 PM   #14
Candymancan
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CCV valve, that needs to be replace if its broken...

it takes clean air from the front of the airbox and puts the unburnt mixture back into the intake.
that's why a clogged rear line will cause oil to build up in the air filter



As for the controller The one thats screwd into the throttle body is what you need to take off
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Unread 05-25-2011, 01:26 PM   #15
classicmetalman
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Quote:
Originally Posted by res0n0xg View Post
In terms of the IAC, I took off the module right behind the TB that is held in with two screws, I saw no nipple, refer to the picture below, is it the unplugged module or the module that's still plugged in?
Also, while working/taking that off a hose coming from the top of the motor knocked loose, although after taking a look at it, it was clearly already broken, what is this below?
What you have unplugged is the TPS. IAC is the other one

LOL, broke off the SAME exact part. $6 at parts store.
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93 Laredo 4.0
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Quote:
Originally Posted by murphydajeep View Post
I say you should still hit something just to let it know you mean business, or shake a hammer at it in a menacing fashion
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