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Old 06-30-2018, 08:10 PM
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95 YJ wont start! Help!

Hey all! So here’s my conundrum i just bought a 95 YJ with a 2.5 motor 5 speed. Test drove it yesterday. Fired right up and purred like a kitten. The next day it had trouble starting. Wouldn’t turn over right away, had to wait a few seconds give her some gas and it would start. Now none of that works. So I’ve tested the distributor and I’m getting spark. The check engine light reads codes so I’m not concerned about the ECM. I even gave it a shot of starting fluid in the throttle body (which gas is visible in) to give it a kick, wont do anything. She cranks and cranks but wont turn over. I can hear the fuel relay click on and there’s a humming sound coming from the gas tank. ANY HELP WOULD BE GREAT! Ive only owned it for 24 hours.

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Old 06-30-2018, 08:44 PM   #2
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4 keys are air fuel compression and ignition
you said you checked spark at the distributor. how about at the spark plugs?

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Old 07-01-2018, 03:16 AM
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I checked the end of the spark plug coming from the distributor yes. However I didn’t think a loss of spark would happen so gradually like that. Just a thought.
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Old 07-01-2018, 09:39 PM   #4
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Most of the time you use a shot of starting fluid in the air filter box not directly into the throttle body. If you had the wiring loose from the distributor cap is there any chance you got the wires plugged into wrong holes altering the firing order so you have spark but not at the right cylinder and time. If you can see fuel in the throttle body is it possible that it is flooding out? Should be more of an air/fuel mixture by that point.

When you say cranks and cranks but won't turn over, I assume you mean that it cranks and cranks but won't start, because turning over is pretty much the same thing as cranking.

You should have gotten at least an attempt to start with the starting fluid going into the air filter box. Assuming the spark was there.

Really hard to diagnose without being there with you.
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Old 07-02-2018, 02:24 PM
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Seems it could be a timing issue as it sounds that there is a “dead spot” while its cranking. I have not changed any of the plug placement being i marked them all before removing them
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Old 07-02-2018, 02:43 PM
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I wish i could post a video of it so you can hear and see what i am.
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Old 07-02-2018, 09:00 PM   #7
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Bad crank position sensor is my bet.
Typical bad CPS symptoms & description.
When they go, they go & you can crank it till the cows come home but it will not start.
Get a good replacement, don't go cheap or you'll be replacing it again in the VERY near future.
The humming from the tank is the fuel pump.
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Old 07-03-2018, 06:13 AM
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I will post a link to my video in a few hours. Will be YouTube on my channel. Hopefully that helps us more!
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Old 07-03-2018, 06:51 AM   #9
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@Rizer306 I told you what the issue is.
Take my advice- go to your auto parts store & get a new crank position sensor & replace it (back of your engine, between the trans & engine).
That'll get your jeep back on the road again.
Or don't take my advice....
Either way,
Your choice.
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Old 07-04-2018, 06:03 AM
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@ZombiePopper i will do that today! thanks. ill update you soon
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Old 07-04-2018, 09:24 AM
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@ZombiePopper . Crankshaft sensor and battery have been replace. Still no start. Any other ideas?
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Old 07-04-2018, 09:27 AM
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This is the video of what the engine is sounding like! Take a listen. See if this gives you any ideas
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Old 07-04-2018, 09:28 AM
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Above is the video of the engine. Hopefully that gives you ideas
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Old 07-04-2018, 03:37 PM   #14
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Still thinking cps
All your symptoms point to it. What brand did you get?
How did you install it?
What changes have you made trying to fix it?
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Old 07-04-2018, 05:30 PM
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I don’t remember the brand. It cost me $75. I removed the old one and plugged and mounted the new one in the same way it came out.

I just replaced the timing chain and made sure timing was all correct. Still no start.
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Old 07-04-2018, 07:24 PM   #16
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Do you get a spark at the spark plug? Take the plug out and rest it against ground, while cranking, you should see a spark, if not, you need to check your ignition system. Next, to the fuel system.
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Old 07-05-2018, 03:05 AM
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@MannyN it is getting spark and fuel
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Old 07-05-2018, 06:32 AM   #18
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For grins throw a meter on your cps'.
It's been a while since I tested 1 but iirc put your meter on ohms & they should read open if they're good. If they show any resistance at all- they're bad. (Test across pins B & C)
Let me explain my thought process;
First- I've had numerous sensors bad right out of the box, brand new. So test the new one just to be safe.
Second- IF your original cps comes up bad, then that means it was your culprit & you now have a different issue (if the new cps tests good) which id suspect timing since the 2.5 & 4.0 are supposed to set timing automatically. in the process of trying to fix it you changed or altered something. And thus, you need to go back to the changes you've made.
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Old 07-05-2018, 11:05 AM   #19
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Quote:
Originally Posted by Rizer306 View Post
@MannyN it is getting spark and fuel

If you getting spark and fuel, an engine should run. The only way not to run would be that the spark comes at the wrong time. Spark should be at compression stroke. Fuel, compression, spark = explosion.
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Old 07-11-2018, 10:09 PM   #20
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The next tool for OP to purchase is a fuel pressure gauge. If the fuel pressure isn't within spec, the vehicle won't run.
That and a Chiltons manual or a Factory Service Manual.

Good Luck, L.M.
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Warn front bumper. Matching imitation Warn bumper on the rear.
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Old 07-12-2018, 08:24 PM
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New update. Ive now noticed a backfire coming from the throttle body.
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Old 07-12-2018, 11:27 PM   #22
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Do like ZombiePopper says and check the old and new CPS. If the new one tests good, the next thing is the timing chain.

Good Luck, L.M.
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1987 YJ-4.2L-Standard Shift- Re-manufactured Carter Carb-2" body Lift-31X10.5X15 BFG KOs-190K Miles No back seat.
HEI distributor with computer and all related relays and wiring removed.
12K Badlands winch with dual batteries.
Warn front bumper. Matching imitation Warn bumper on the rear.
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Old 07-13-2018, 04:52 AM
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I will check that again. In the meantime I am receiving codes for. map sensor. throttle body sensor (low and high) PROM error. Quad driver error. intake air temp low. These were thrown after it stopped running.
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Old 07-22-2018, 03:15 PM
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Update. Shes running again!!! Thanks to those that helped!
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Old 07-22-2018, 06:16 PM   #25
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What was the fix. I am chasing a very similar problem????

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Update. Shes running again!!! Thanks to those that helped!
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Old 07-27-2018, 04:30 AM
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@StephenCBrinson My issue was timing. Gave it a fresh cap and rotor, plugs, timing chain, crank sensor. Also make sure that the plug wires are in the right firing order on the cap. Sounds stupid, but its easily overlooked if your knee deep in shit. Dont get tunnel vision. do diagnostic tests on the jeep first. Test light, timing light, voltage meter. Thats what i did to rule out issues. Also check the fuel injectors for proper operation.
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Old 07-27-2018, 07:48 AM   #27
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Thanks for the update. Mine ended up being timing as well.

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Old 07-27-2018, 08:25 AM   #28
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Quote:
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@StephenCBrinson My issue was timing. Gave it a fresh cap and rotor, plugs, timing chain, crank sensor. Also make sure that the plug wires are in the right firing order on the cap. Sounds stupid, but its easily overlooked if your knee deep in shit. Dont get tunnel vision. do diagnostic tests on the jeep first. Test light, timing light, voltage meter. Thats what i did to rule out issues. Also check the fuel injectors for proper operation.
Do you know which one of these "fixed" your issue, or did you change them all at the same time?
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Old 07-29-2018, 05:33 AM   #29
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My suspicion & from what I’m gathering from @Riz er is that there ended up being a couple culprits?
initially the cps was bad (REALLY common) & in the process of diagnosing it the timing came out of adjustment.
So what started as 1 thing ended up being a couple issues.
Correct me if I’m wrong Rizer

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