Sorry i meant the contacts on the ICM. I checked the voltage on those contacts and it was 4.7 VDC. Sorry bout that. The voltage to the wires is 12v i checed that as well. No need to get sarcastic bro i still am following everyones advice.

 

Did you bring the coil too for testing? I can't tell what the voltage at the coil is supposed to be. Normally it is 12 V but the 5V could be ok. If the ICM is bad, maybe that's your problem. If the coil is bad, you'll still have the same problem.


"All i changed was the spark plugs, how the hell does it fail and not start after that? They were gaped to .70."


The gap on the plugs is 0.035" for my old Champion coppers. What did you put in?

 

The new ones or the old ones?

 

Yeah i brought the coil in as well but they said they didnt need that. But it is brand new. I dont know how to test it if its bad or not or if i got a dud. But about the spark plugs yeah the .070" with in my opinion i pretty high, i gaped the new ones at .035" as well.

 

 

Alrighty guys so heres the update. It was a few days since i worked on the jeep, new addition to the family AKA my new little dude. Anyways so i got a ICM from thexjfiles and threw it in of course it didnt start. So i was reading in the manuals i found and i was thinking about the ASD relay. Now i dont really remember if the fuel pump starts up, not sure if it does either. With that there should be about 38psi pressure from the fuel rail right? I know i have residual pressure but not sure if its the full 38 psi or not, i plan on going and renting one. As with the ASD relay, i read that if that dosnt recieve voltage and close that it could cause a no run no start condition depending on conditions. Excatly how would i go by shorting the relays? Ive never had to do somthing like this but i heard its a legitamite test. Anyways just let me know what u guys think.

 

Its called Power Latch Relay....Have you confirmed all fuseable links are good? http://jeep.zerok.ru/index.php?page=196

 

Yes i did but i will definately check em again.

 

Ok so now heres the update. So i went ahead and pulled the relays and jumped the power. I know i have 2 of them bad now, cause when i jumped the fuel pump it started right up. SO i also jumped the power latch relay and tried starting but i got nothing. I plan on trying it out with someone else's help cranking the engine and letting me check the spark. I will give more info with what i get tomarrow. Thanks again guys.

 

I have a wire permanently attached to my solonoid terminal on the start relay, so I can crank it whenever I want. Remember, any time you make a spark near the battery, it may explode! (Also in my sig is a diagram for the SPDT relays)

 

Ok so heres whats going on. I had my step dad come over and help me out last night. I jumped the pin 85 and 30 on the ASD relay and fuel pump relay. Well now i know my fuel pump runs, and the relay is bad. Actually i think several of the relays are bad. Well any ways, when i turned the fuel pump on and i heard like a spray noise coming from either the fuel rail or the injectors. Not sure. Well along with that we went ahead and tried testing the coil(which i replaced with a new one) and when i didnt have the ignition turned on the coil was registering 6.6k ohms from the negative to the high voltage output that goes to the distributer. When i turned the key over there was voltage present at the same point. I think it was 6.4 VDC. When we cranked it over the voltage fluctuated from 4.3-5.1 VDC but yet there was no spark at the plugs. I forgot to mention the the tests i did were from the haynes manual.

 

I don't mean to sound like a jerk, but you are about 100 days into trying to fix your Jeep but haven't got anywhere but with less money in your pockets because you've spent it on unnecessary parts.

You need spark and you need fuel and you need a motor that turns. Each part of that are not that complicated and troubleshooting each of them should take no longer than an hour or two, even with just basic tools.

Any decent shop would be able to tell you what is wrong with it in less than one workers shift. You need to consider that option because you haven't been able to do it in more than 100 days.

I hope you figure it out man cus it pains me to watch this failure.

 

I don't know how much time you've put into it, but imagining that you've put a few hours each weekend into it trying to get it running would translate conservatively like this...

12 weekends. 4 hours a weekend. A measly $10 an hour for your time. (shop rates are usually $50 and up per hour, emphasis on the up) That is already $480. Add to that the several hundred dollars of parts you have said you have bought and replaced and you are close to a grand already and still don't have a running Jeep.

I paid $1000 for my beater Heap Jeep and it starts and runs just fine. On Craigslist, $1000 to $1500 running 4.0 4wd Cherokees are commonplace.

It may seem like I am picking on you but I am doing you a favor. You want a running Jeep and can't make it happen the way you have been doing. Turn the job over to someone more qualified or get a different vehicle cus the Jeep is going to need to be worked on way more than you will ever be able do it at the rate you are going. Not everybody is cut out for this.

 

I tend to agree -you want a running Jeep- instead of spending hundreds of dollars on parts-better to get an estimate from a Jeep mechanic or trusted mechanic. I have a good garage I go to and he knows I do most of my own work so he just charges for diagnosing the issues, gives a list of parts needed etc. For instance, I had him replace the steering shaft, I had a body guy do the floor pans but I did the shocks, front and rear brakes and steering stabilizer to get the safety inspection done.


I'm not a mechanic but since then, with the help of others on the forum, youtube, etc, I replaced the fuel injectors, rear brakes, fuel pump, fuel filter, etc. BUT...If I wanted the A/C to work, I wouldn't even bother buying tools and parts etc. I'd take it somewhere that does that all the time.


Have to know what you are capable of. It's great to learn but it's the diagnostic ability of the mechanic that you are really paying the money for. It's a lot easier if you take it somewhere and the guy says "I check the fuel pressure, and there is none at the rail and you need a new fuel pump". Then you can look and see how much the fuel pump is and how much labour it will be and then you decide if you want to tackle that.


When you said in your first post that you've got fuel pressure at the rail so I know my fuel pump is working. That leads most to believe that you've checked the fuel pressure (with a gauge that is free to use at most parts stores) and you have heard the fuel pump prime!. No one's going to be thinking that the relay may be bad as you have ruled it out with your comment about fuel pressure and the pump.


You will be further ahead to find someone who can help you on-site or in mechanic's garage. As the last poster said, we can pick up RUNNING Jeeps for under $1000 so why would you put hundreds into one that has a "no-run" condition and blindly hope to come across the issue.


Sorry to be blunt.

 

Guys i understand what you are saying, maybe im not clear enough in my post to whats exactly happening and what conditions i have. I will not, may it be stupid or a waste of time, take this vehicle to a mechanic. Unless it is a dire situation. I know this thread has been up for a 100 days or so but i have not had the time or ability to work diligently ever weekend. After just having a newborn son and going to school, im not left with much time.

So with this im asking just for mechanical help in trying to diagnose the problems with my jeep. Telling me to just give up with all the work and stuff i have put into this makes me kind of feel like you think its not even worth the trial of fixing it. I disagree.