1990 yj stalling?

[Moo$e]

I recently bought a 90 yj auto and i start driving get like 4 blocks and it wants to stall on me. if i keep on the gas i can here a putting sound and it wants to stall and once i stop it dies. i tried a simple fuel filter change and  thinking of changing out the fuel pump. Any one know if fuel pump will fix it or what the problem is? Thanks for your help greatly appreciated Mike.

[Evil-Jeep]

I would start by inspecting the  plugs, air filter and oil first. I have not experienced or seen nearly as many fuel pumps go over a bad wire, or plug. If your YJ uses a fuel rail like one on a TJ you may be able to test the fuel pressure there.... I am sure there are many YJ owners on this board that can advise if this is possible and how to go about doing it on a YJ. Is this a regular problem? is the motor already at temperature when this happens or does it happen when it gets to temperature? when you first start driving can you accelerate at a high rate or does it sputter?

[Moo$e]

Thanks for you help i'll check out the plugs and oil filter is in good shape. i only drive a couple block jsut to get to work and back and i have it stored in underground parking temp is set at 20c so on the 4 blocks to work it's fine but on the way home as im driving down the ramp to the garage it stalls. on the way to work its got as much power as it can put out on the way home it seems not as much i haven't paid attention to the temp.

[Evil-Jeep]

I am very tempted to say your are either not getting enough air or spark and causing the motor to flood out.... how easily does it start back up after stalling? has it only happened while driving down into your parking lot, and if so are there any other parts of your comute with similar conditions as the ramp? If not you could try starting up heading out turn right back around and see if it stalls again.

If you can cause the same symptoms on a regular basis by driving down a slope at low RPM you may be looking at sediment in the tank blocking flow to the fuel pickup or a loose wire or connection on something like your fuel pump.

Is your YJ a Auto or Standard?

[Moo$e]

first time it happend it was on flat ground i was heading to the store and its pretty much the same distance as work and on that time it stalled on a main road and took me about 20 mins to get it going again but after that it starts right back up with a little gas and its a auto. i'm trying to change my spark plugs as soon as i can find a place that sells E3. i'm also missing my intake house but i don't think that would be the problem maybe part of it?

[Evil-Jeep]

sounds like to much fuel, either from not being burned, or from lack of air..... before you buy new plugs take one of yours out and inspect it for damage, wear or fouling, There are a lot of websites with pics that can help you with the visual inspection of your plugs.

[Moo$e]

awesome thanks i took one out last night and it was black not sure if thats normal or not i'll check it out. thanks for all your help.

[BBD]

could also be plugged exaust.

[Evil-Jeep]

I am sure there is someone more knowledgeable about YJs on here than I am, and can confirm this or not; If you are missing your intake hose where is your O2 sensor located, you may be "confusing" the computer and causing it to stall as well. If you are unable to find a stock replacement ask around and see if there is a direct junkyard swap off of a ZJ or XJ, an intake off of a different vehicle may also work just measure the throttle body size first.

[Moo$e]

could also be plugged exaust.

theres a new exhaust on it so i don't think thats it

[Moo$e]

i think the o2 sesor is mounted someplase different not to sure sence i never had a intake hose , hopefully someone on here has one for sale i can get. i'm gonna get some help this weekend and see if my friend can find the problem. i'm getting some new spark plugs just cuz i want to get some E3's and see how they work. hopefully i can get it fixxed this weekend and i'll let you know.

[4Banger_madness]

if u do change your plugs and the problem is still there they may get frigged

[Moo$e]

ok so i'll wait and try to find the problem and then change the plugs and if i can't then i'll put them in and see if its the problem. thanks for letting me know that

[Evil-Jeep]

if u do change your plugs and the problem is still there they may get frigged

Absolutely... but you can still look at your old plugs to diagnose some of the issues you are experiencing.

[Moo$e]

yeah i looked online at spark plug analysis site (  http://www.gnttype.org/techarea/engine/plugs.html )and it looks like i have Carbon fouled on my plugs which says:

 "Basically, soft, sooty carbon deposits, as shown below, have a dry, black appearance. If only one or two plugs in a set are fouled, it is a good practice to check for sticking valves, a cracked distributor cap, or bad secondary ignition wires. Fouling of the entire set might result from an incorrect heat range spark plug or an over-rich air/fuel mixture caused by a clogged air cleaner filter element, a sticking heat riser valve, or a faulty choke. Fuel injectors that malfunction can also lead to this condition.
Other causes include weak ignition system voltage or an inoperative pre-heating system (carburetor intake air) or poor cylinder compression."

So i'll be checking out the things it states and hopfully with all the info and help i got it will be fixxed.