Engine will not start and run?

Are you getting spark and fuel to the engine? Will it start with starting fluid? When you turn the key to the on position without cranking the engine over can you hear the fuel pump run in the tank for 5 seconds?

https://www.2carpros.com/articles/car-cranks-but-wont-start

Please run down this guide and report back.

Had same problem with my JGC laredo eventually had to replace computer with new one, each computer is set for that car that is what I believe, good luck Dec

Jeep was running then went to start but want checked fuses and relays. Is not firing. Need some help!

scan for codes and check crank sensor. do wiggle test on crank sensor connector if it starts you'll need another connector. check fuses underhood.

Where would you find it? I looked for it yesterday and then call a auto parts and they said there is not a listing of one on that model. I was getting power to my coil but fire out of the spark plug. So have replaced the rotary button, distributor cap, and coil Checked rotary button to see if if was spinning it was. I am getting fuel to the fuel injectors.

if you are getting a nice spark to the dist cap then sand down the contacts inside the cap and make sure the cap isn't cracked and wire from coil is good.ya know I love autoparts guys they will tell you anything you want to hear. see pic for sensor location.

Going to find it now. Let you know what I find out. Thanks

I found it took it out clean it up with some light grad sandpaper still Wil no crank can you tell me what i senses. It it some type of magnetic if it was it was not that strong.

ya know when you guys say it won't start say it won't turn over that is a whole different ballgame. the crank sensor is magnetic. first you check your battery for condition including load test autoparts can do it. does it not turn over or not run what is your fuel pressure like asked in very first reply? I really think this is to much for you. ittells the module when to fire. Have you check ed fuses underhood or only in dash. check the coil with an ohm meter shold be 9.5-1.20 between small terminals an d11,000-14,000 between negative terminal and large output where the plug wire goes. if out of range then the coil is shot. I have no further comments or suggestions.

The colder the mornings have gotten, the harder it is to start. I've noticed that when I turn the key to the 'on' position, if I wait in silence - not turning the starter over - I wait until I hear a rapid clicking sound, then when I engage the starter the motor starts every time. If I turn the starter over before I hear the clicking sound it will not start- it just turns over. I've had a friend turn the key to 'on' while I'm beneath the hood before, and I found the clicking is coming from the power distribution box- specifically the relays are clicking- I can feel it with my fingers. I have replaced both the starter and fuel pump relay switches, but problem still exists. I have replaced the fuel pump also. It seems the problem is electrical, I'm wondering is it the computer? I should note that the battery has plenty of juice, and the starter acts as it should every time I turn it over.

Check the fuel pressure and if okay-inspect and test the engine coolant temperature sensor-comeback with results-

I'm having the same problem. 1995 2.5 L. Replaced plugs, wires, cap, rotor. ECT tests in range. Seems to hold fuel pressure overnight. I've noticed that often the check engine light does not come on and codes will not display. I turn the ign off for several seconds and try again, often many times, the engine will not start. Eventually the light comes on and the engine will start and it runs just fine. Sometimes it takes several hours. Once I opened the hood and let the sun heat the engine for a couple of hours and it started right up; may be a coincidence. Getting only the meaningless codes 12 and 33 for the past several weeks, including before it got cooler overnight and started having this trouble.

Good morning.

I would start by verifying power at the fuel injectors and ignition coil. You should see power for about 2-3 seconds when the key is first turned on. After that, power should be continuous while the engine is cranking or running. See the attached diagrams of the injector and ignition coil wiring. The dark green w/orange tracer are the 12v power supply circuits(which are highlighted). If you do have power, we'll then have to determine if the injectors/coil are getting a signal from the PCM to fire. If there isn't power, we'll have to trace down that side of the system.

Let me know what you find!

turn jeep on will not fire for 10min or so than after it clicksthe check engine light comes on and it will start

Seems an error has been detected in the engine management system and when the CEL turns on, the component concerned has been disable whereby the engine computer would revert to back-up mode for the sensor. You would need to retrieve the trouble code to understand what is wrong and continue from there.

my jeep wont start. it ran and then it backfired and stalled. it started after that. then it shut off. it sat a couple of days and then it started again and did not run after that it seems like some type of a fuell problem

Lets start with the basics. Test the fuel pressure and compare it to a manual and see if its in specs. Next test for fire at the plugs. Let us know from here what you have. Curt

I bought this jeep this summer. Worked fine. Then when it started to get cold, it started to get hard to start. I took it to my mechanic and they started to replace stuff on it, first the starter, then the fuel pump. I can't even think of everything that we have replaced! It is now 20 degrees and it has been towed twice and they can't get it started! They have had it for a week. Can't figure out what the problem is. It was none of the things we have fixed! I have read on the internet that this is a problem with wranglers and no one seems to know what causes this. Can you help me please! I have spent over $4000. They are now working on it for free.

Hi Have them check ECT and IAT see diagram the colder the higher the resistence. Tells computer to inerease injector pulse and timing. Hope this helps Thanks for donate

They have checked this. They even rebuilt the relay system. He said that it's getting fuel but not spark. Sorry, I am trying to communicate to you what he is telling me!

Has camshaft and crankshaft sensors been checked. New coil?

Yes, the crank shaft has already been checked and the "coil", I asked about it and they said it has already been addressed and not it. :-(

Yes, folks this jeep is a problem!

Susanna

O.K. have plug wires been changed because a TSB was issued for cold start on 94-95 2.5

Spark plugs have been changed. I asked about the wires themselves. The mechanic that has been working on my jeep went home early. He was exhausted! Poor guy! Probably has a migraine! The manager said he would ask about the wires tomorrow morning and let me know. I did read to them what you wrote.
Thanks

So I had the Jeep for 2 days and now it's back in the shop today cause it won't start. Well, it started but only after one of the guys came up here and put some battery power thing on it and cranked on it for 20 minutes. Even then when it finally started to turn over, it didn't want to stay running for about 5 minutes of his working on it!

I did ask if they replaced the spark plug wires- yes they did. He mentioned that he was going to put another new coil of some sort on it and see if that would help. I am just so frustrated here! Why are all these jeeps driving around and mine isn't!! Help!

After they got the jeep started yesterday, we drove it to the repair shop. They had it plugged in all night (as did we) and it did not start this morning. So everything that has been done so far ($4000 worth!) has had nothing to do with the starting problem. Someone must be able to figure this out!

so the jeep cranks but wont start its getting gas and its getting spark and the timing is dead on we cant figure it out but I took the coil wire off and put a plug in it and grounded it and cranked it over and it fires really slow its like fire wait 4 to 5 seconds then it fires again then another 4 to 5 seconds and then fires should it be like really fast like 1 second between fires. we have replaced the crank shaft sensor and plugs and distributor cap and button .

I think you may need to remove the cap on the distributor and watch it as you crank. Sounds like the distributor itself may be bad or the gear at the end of it is worn out. Also check for a weak coil pack.

IN DETAIL TELL US WHAT YOU HAVE TINKERED WITH/ REMOVED/ PUT BACK ON/ ETC- NO CHEATING-SPILL YOUR GUTS!

MR. PLUG WIRE/ SPARK PLUG IS ONLY GONNA FIRE ONCE EVERY TWO REVOLUTIONS OF THE CRANKSHAFT

....OR ONCE, EVERY FULL ROTATION OF THE ROTOR BUTTON, (WHICH IS THE SAME THING AS 2 REVS)

IF YOUR ENGINE IS CRANKING OVER SLOW, THEN THE SPARK OF THAT ONE PLUG WILL BE SLOW TO IGNITE TOO

HAVE YOU SCREWED WITH THE TIMING? LIKE LOOSENED THE BOLT UNDER THE DISTRIBUTOR/ TWISTED/ OR EVEN REMOVED THE DISTRIBUTOR?

IF EVERYTHING IS LIKE IT ALWAYS HAS BEEN, SHOOT A ONE SECOND BLAST OF STARTER FLUID OR A SQUIRT BOTTLE WITH A LITTLE GAS IN IT (GIVE IT 2 SQUIRTS) INTO THE THROTTLE BODY THEN STICK THE BREATHER HOSE BACK ON AND GIVE HIM A TRY!

REPORT BACK WITH WHATEVER RESULTS HAPPEN

THE MEDIC

I have a 1994 Jeep Wrangler, 6 cyl, 4.0, manual 5 speed trans. It sat in storage for a while and I recently pulled it out to get it back on the road. After changing all the fluids and flushing the radiator, I jump started it; the battery was completely dead. It cranked right up and I drove it for about an hour to ensure all was well. I noticed a fuel leak at the tank so I dropped it and repaired a loose fuel line. When I asked my son to hook the jumper cables up so I could jump it, he connected them backwards; my fault for not double checking. It blew both alternator fuses, but didn't appear to do much else. When I tried to start it after the fuses were replaced I noticed the fuel pump wasn't running. I pulled the fuel pump and tested it with a good battery, it checks good. My issue is that the engine wants to crank but will not turn over. I know the following: 1. The fuel pump isn't getting any power from the fuse box under the hood. 2.Fuel filter replaced and installed correctly. 3. The fuel relay and auto shutdown relay is good, brand new. 4. All the wiring to the pump and under the hood meters good for continuity. 5. All the fuses are good. 6. I don't think the plugs are making spark. Pulled one out and cranked the motor with in grounded; no sparks. 7. Everything else (horn, wipers, lights, ect.) works. 8. The fuel indicator in the dash works properly and displays fuel level. 9. I replaced the ignition coil with no results. 10. Check engine light is on, but do not have a tester for pre-OBD 2 system. What would cause this? Why is no power making it to the fuel pump when all the wiring and fuses are good? Why are the plugs not providing any spark? Could this be a fried computer? If someone can point me in the right direction I will be in your debt. I am an active duty Marine stationed in California. I have orders back to North Carolina and need to get this jeep running so I can get it cross country. Thanks in advance for any help.

you may have lost the computer. check the powers and grounds to the computer to verify powers and grounds

Roy

Bad things happen to computers when voltage is reversed to them very comin to take out a computer . Go with all powers and grounds to the pcm

My wrangler has a problem starting in the mornings. The moter will turn over but won,t start in the mornings when its cool. But in the afternoon when it warms up outside it will start right up.You can hear the fuel pump relay kick in when it,s warm outside and it will start.But when it,s cool outside you can,t hear the relay kick in and it won,t start.I have checked and change the relay with no luck. I have checked to see if there is power to the relay switch in the mornings when its cool and in the afternoon when its warm . I get the same thing. I think it,s a weak fuel pump .A few friends that have jeeps told me they think thats it . But there not sure.Any input would be a big help .

try doing a pressure test on the pump? Is your jeep fuel injected? If not more likley the choke thermostat. I am answering this question just jumping around different groups. I mainly do Ford Linc, Mercs

they/you could be correct,try cycling key(w/o cranking) key on 2 sec. then off,key on 2 sec,then off,then on 2 sec, then crank(make sure you wait @2 sec. when on and off. if it starts up fine suspect fuel pump. have you ever changed the filter??, if not i would strongly suggest try that first/or in conjunction with pump. do you have access to a fuel pressure test guage??. try the key test to build pressure if not. let me know what you find

I,ve changed the relay and the filter. I won,t know if it worked till it cools off tonight.I don,t have a fuel pressure tester. But when i changed the filter there seemed to be alot of pressure on the line. Is there a censor or something that could be going out? I just went to the store and it was still slow for the relay to kick in.I turned the key on and off and the next time it kicked on.So the promblem is still there.It was just cooling off a bit outside.I don,t know why this only happens when its cools off outside?

i have the same year model jeep,it was doing the same thing,i changed the fuel pump out and that fixed the problem, the old one worked but but it was just too weak, you can get one at oreillys for about 100.00 bucks

Hi, my wrangler died on me driving for the 2nd time.

94 yj 2,5 l. 4 cyl man .

everything seems to work but would not restart. I had a ecm changed, run with it for a week and did the same thing again.

The mecano told me that the ecm would not open the injectors. fire is fine, fuel is fine.

Would this be an electrical problem?
Is a 2nd ecm fried ?
Or does both ecm still in working order?
Anyway of checking those

Summer is running out fast and I am Jeepless.

Thanks for helping

Reggie

[quote:e0b34a2ed3="rejdepic"]Hi, my wrangler died on me driving for the 2nd time.

94 yj 2,5 l. 4 cyl man .

everything seems to work but would not restart. I had a ecm changed, run with it for a week and did the same thing again.

The mecano told me that the ecm would not open the injectors. fire is fine, fuel is fine.

Would this be an electrical problem?
Is a 2nd ecm fried ?
Or does both ecm still in working order?
Anyway of checking those

Summer is running out fast and I am Jeepless.

Thanks for helping

The mecano told me that the ecm would not open the injectors. fire is fine, fuel is fine.
Reggie[/quote:e0b34a2ed3]

Try disconnecting an injector connector and use a noid light while cranking it over is the lite flashing?

I have a 94 Jeep Wrangler and about a week ago my son drove it to school and went on the bus to a ballgame and was gone all day .When he returned that night the Jepp would not start.I went up to the school that night to see why it would not start.It acted like it was not getting gas so I handchoked it and got it started and got it home.It worked fine the next several days till it got cold one day, then same thing,itwould not start. I tried to hand choke it againbut couldn't get it to start.It would act like it wanted to but wouldn't.I think it is not getting gas to the carburator.Would this be the fuel pump out and if so where is it located,on the motor or in the gas tank? Please help me if you can? Thanks Charles