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Old 09-23-2012, 11:36 PM   #1
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Yj no spark, no start please help..

Ok so id like to say that this site is pretty cool and im hoping to get some good pointers as to my YJ's Problem so i can get it on the road..

Ok i have a 1995 Jeep Wrangler 5 spd and i just bought it with it NOT running.. The guy said one day he drove to store and it was fine on the way there.. Came out and no start.. He then got it towed and his fun began. He replaced the following..

1) Spark Plugs
2) Spark Plug Wires
3) Cap and Rotor
4) Cam Sensor
5) Crank Sensor
6) Full FlowMaster Exhuast
7) 02 Sensor
8) Engine wire harness
9) ECM/ECU
10) Ignition Switch
11) Coil pack


I get the Jeep home and began my fun.. I keyed to on position and got nothing. No check engine light and No fuel pump prime. So i then took out Newer computer that the guy put in. I then took the Original ECM and decided to check the Capacitor's as i hear they go bad but all looked ok. So i decided to clean it with electrical spray cleaner and i plugged it in and see what happends. I could key to on position and hear the fuel pump and see the check engine light so i tried to start. Took about 15 trys but it did start up and idled for about 10 mins before i shut it off.. I thought maybe i had a easy fix and was done but NOPE.. I shut it off and tried to re start the Jeep and it just cranked. Then again after a ton of tries and some gas pedal pushing it started but this time it was back firing really bad and smelled VERY rich then died out. Also both times i had to JUMP the Jeep as the battery was low.

I then started checking over all fuses and all were good, Checked crank sensor and tested good, Checked coil power and was good, Replaced Distributor as i noticed that someone was recently there due to the hold down bolt being backed almost all the way out, I took motor to TDC #1 on compression stroke and then installed the new Distributor like my manual explains. Tried to start but NO spark. I checked for spark coming out of coil and sure enough im not getting anything out of the coil.. I also checked all my connectors and didnt see nothing bad here. Im lost as what to do.. Could it be i have a bad ECM? I mean look at the list of what was replaced.. This has me very frustrated to say the least.. PLEASE HELP..

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Old 09-24-2012, 12:30 AM   #2
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I had the same problem and for me it was the ground. Add a main ground to the black wire coming from the distributor. Hope this helps.

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Old 09-24-2012, 12:44 AM   #3
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Ok i will try that in the Morning. Thanks for the respond.. So you had the same symptoms and all you did was add a new ground to the Distributor? Are you talking about grounding out the Cam Sensor wire?
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Old 09-24-2012, 10:24 AM   #4
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1st thing i would do is get a new battery. The ECM is a sensitive unit, and requires a full 12 volts to operate. If it isnt getting an adequate voltage, it wont allow the system to work, kinda like its own little failsafe device.

The grounds are very important as well. Make sure the wires are good, and if you can do a continuity test on them to make sure that they are in good working order. I had a similar problem with mine and it was as simple as the ground for the solenoid was bad and it would roll over but not fire.

If any of the wires are corroded, its a good place to start with the trouble shooting.
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Old 09-24-2012, 02:43 PM   #5
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I recently had a no start issue with my jeep. I tested my crank sensor and it showed that it was fine. Bought a new one and it tested the same. Installed it anyway and it worked. Dont know why, but it did. Could have been the connector as I've heard they go bad. A week later I replaced the distributor pickup for good measure.
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Old 09-26-2012, 11:21 AM   #6
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Ya i did a load test on my Battery with my Snap on Battery tester and it comes back good.. When im cranking it drops down to 10.8 Volts.. I have also checked all the grounds as i did not find ANY bad.. But for the hell of it i bought another ground strap and added it onto it.. Still got the smae result.. turn over but nothing.. I checked for spark again and i am not getting any Spark out of the coil but im getting power into the coil.. Its brand new and i also tested it and all was with in normal SPecs..

Anything im missing? Oh also the guy who had the jeep before me un bolted the ignition switch.. idk if that could be the problem???
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Old 09-26-2012, 02:20 PM   #7
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did you check the trouble codes?

Diagnostic Trouble Codes

Sometimes the jeep will tell you exactly what's wrong.
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Old 09-26-2012, 03:10 PM   #8
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Also, try this to rule it out...

Turn key to on and wait. Sometimes 1 minute, sometimes up to 20 minutes. With the key sitting at on, eventually if the CE light comes on and you hear the fuel pump growl at the same time, it should start at that point. Thats a key symptom of the failing pcms.
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Old 09-26-2012, 03:45 PM   #9
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+1 on the ground wires, god they are SO important and people start tossing money at issues before checking. So I would recommend that first and foremost, then dig into things in order or cheap/easy on up!
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Old 09-26-2012, 04:55 PM   #10
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Ya ive checked the Grounds and i havent found a bad ground yet. Also the Check Enging light comes on everytime you turn the ignition to the on position and i can hear the fuel pump at the same time.. So with that being said what else could it be?
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Old 09-26-2012, 05:04 PM   #11
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My Trouble codes where as followed..

11 - No crank reference signal detected during engine cranking. Intermittent loss of either camshaft or crankshaft position sensor. CKP sensor target windows have too much variation. (CPS SENSOR)


54 - No camshaft signal detected during engine cranking.

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Old 09-26-2012, 07:46 PM   #12
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Check the connections on both of those sensors. You said the previous owner replaced those sensors? Make sure they are, in fact, new. People like to "sell" you on the fact that they dumped all kinds of money into the vehicle before they sell it. If the sensors are new, they could always be defective.
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Old 09-28-2012, 02:45 PM   #13
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Ive checked all the connections on sensors and all looked good.. Ive replaced Distributer, Cap & Rotor, Plugs & Wires, Coil pack, Cam Sensor, Crank sensor, added a new Engine Block Ground, Checked the other grounds and all seemed to be ok.. Any other idea's as to why im getting power to the coil but No spark out of coil?

I bought a ECU/ECM on Weds from EBAY and im waiting for it to get her Via UPS on Monday or Tuesday.. Maybe thats the problem??
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Old 10-01-2012, 08:05 PM   #14
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Ok replaced ECU with a new one and still no luck at all.. NO SPARK and NO START.. This jeep will crank all day long but not fire up.. Please help..
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Old 02-02-2013, 06:02 PM   #15
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I am doing a frame off restoration. And I am having the same exact problem. I have spent hours trying everything. I have replaced all the same stuff and still can get any spark. Were you able to figure anything out?
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Old 02-07-2013, 05:57 PM   #16
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Hi, guys. I'd like to add my same issue to this thread. I got no spark after an exhaust system upgrade and tune up. I finaly threw in the towel after about a month and countless hours of searching, probing, and replacing parts and turned it over to a certified mechanic. Just Empty Every Pocket is becoming more than just a funny saying.
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Old 02-10-2013, 09:13 PM   #17
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Hi, guys I have an 89 4cly that I had been chasing the same but I also lost power to the fuel pump. I got digging in to it the other day and found a relay that's called the auto shutdown mine was running up to the point I shut it off after getting home from work one night. you should have one even though it EFI. mine had rotted the tabes off the relay
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Old 02-13-2013, 12:34 PM   #18
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E Low did you ever get this fixed? I'm having similar issues.
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Old 02-13-2013, 07:23 PM   #19
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Hey E-Low, I finally got my jeep back, and it turns out I had a bad wire on the plug harness that connects to the cam sensor inside the distributor. I had to run a new wire directly to the ecu harness. Concentrate your focus at the dist/cam sensor pick up and its wires. That code 54 is there for a reason. If the ecu can't read the cam and crank sensor together it will not create the ground for spark. I think the wire was the blk/lt. blue one in the middle to double check use a volt meter or noid light and change the one the is suspect. I'll try to get pictures, I'm sure your solution will be similar.
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Old 04-08-2013, 07:32 PM   #20
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I am having the same problem.
New plugs, wires, rotor, coil, crank position sensor, relays and fuses. No spark, no fuel, no check engine light
Any ideas, I'm losing it...
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Old 09-03-2013, 06:35 PM   #21
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I'm having issues too, so any of you who have solved your problems, maybe you can share with me, and whoever else has similar problems, what your fixes ended up being. I don't really want to replace my ECM for $700 right now.

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