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Old 06-24-2013, 06:15 PM   #1
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Dead Jeep out of ideas

Well, I'm out of ideas guys. My 1994 2.5L Manual is dead. Ran the seafoam through it as instructed and it died while driving. It'll crank but not turn over. I've changed the plugs, CPS, ignition coil, distributor cap, rotor, fuel filter, and ECM. Still will crank but not turn over. Anyone have a new idea?

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Old 06-24-2013, 06:41 PM   #2
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Check, check and check again

Are you getting spark at the plugs? Are you getting fuel to the rail? Those would be the first thing I'd check.

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Old 06-24-2013, 08:32 PM   #3
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Yes to fuel, no to spark.
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Old 06-24-2013, 08:38 PM   #4
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Check your grounds.
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Old 06-24-2013, 08:43 PM   #5
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Check the crankshaft position sensor too, a long shot, but caused my 91 to die out of nowhere with good grounds and fuel and battery.
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Old 06-24-2013, 08:45 PM   #6
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Yes to fuel. No to spark
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Old 06-24-2013, 08:46 PM   #7
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Changed the CPS. Where should I check the grounds?
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Old 06-24-2013, 08:55 PM   #8
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Check the power to coil. Then check the auto shut down relay
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Old 06-24-2013, 09:17 PM   #9
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I have been there, I didn't quit and eventually figured my problem out. Sometimes wires and ground wires look good but are not. My brother had an 89 Wrangler that would not turn over. Everything checked out Ok. Turned out his battery cables were bad, even though they looked fine, I wouldn't count on the Seafoam having anything to do with it either. My jeep failed to start after I Added Burke system cleaner, it was not the cleaner.
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Old 06-24-2013, 09:20 PM   #10
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Fuel system cleaner not Burke system cleaner. I have a 4.0 so my. Grounds are likely different. I had a ground from the block to the firewall. Also had one from the negative wire to the firewall and the engine to the firewall.
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Old 06-24-2013, 09:29 PM   #11
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fuel/yes, spark/no

If you have one, it's time to bust out the multimeter. Start checking everything under the hood for voltage with the key in the run position. Paying close attention to the coil. You say it cranks, pull the distributor cap and see if the rotor is turning while cranking. These are just things to start with. The list gets longer. Good luck.
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Old 06-24-2013, 10:31 PM   #12
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Might have to buy a multimeter. The rotor turns at the correct speed. I checked that.
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Old 06-25-2013, 09:13 AM   #13
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Grounds are the same for mostly all engines. Engine to body, battery to body and engine. Alternator to engine. A lot of time there will be more than one for the things I just listed. I am Assuming the OP checked all fuses and wiring under the fuse box next to the battery. I have seen the wires come out under the box, look fine, but stop a Jeep dead.
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Old 06-25-2013, 01:01 PM   #14
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Yes it will overkillyj hade same problem with fuel pump relay pushed it back up and away it went. To bad engine swap wasn't that easy
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Old 06-25-2013, 01:52 PM   #15
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Also I would check the battery cables, man those things really store corrosion and can cause serious starting issues. If you try and turn on the engine and you a distinctive "click" then nothing that is a strong indicator of this issue. Dunno why.
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Old 06-25-2013, 05:06 PM   #16
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Fuel pump is not working. In the middle of replacing that. Still no spark. I know for sure because it won't start with starter fluid. I have checked every wire I can without a volt meter. I may just have to get one. Changed the CPS, but what about the cam sensor or I also heard about a pick up coil?
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Old 06-25-2013, 05:08 PM   #17
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It's definitely the spark. Should I replace the whole distributor? I only changed the cap and rotor. The rotor is turning.
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Old 06-25-2013, 06:14 PM   #18
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Check the wire coming in to the CPS from the ECM. It should show 5 volts. Also crank it over with the CPS unplugged, leave the switch on then plug it back up and try to crank it.
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Old 06-28-2013, 07:31 AM   #19
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Rain delay. I'm doing all the work without a garage. Curb side mechanic.
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Old 06-28-2013, 11:20 AM   #20
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Nothing wrong with that do all my work in backyard
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Old 06-28-2013, 08:48 PM   #21
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Well it runs. Only problem now is that I just blew 2 30amp fuses to the fuel pump ecm in 3 minutes. What the hell is causing that?!?!?
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Old 06-28-2013, 09:21 PM   #22
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30 amps is a lot of juice so look for scortched wires. I am not familiar with the fuel pump ecm but it is possible that the fuel pump is basically locked up and drawing a lot of power.

On some pumps you can reverse the polarity and get the pump to run backward enough to dislodge what even is locking it up.

It is possible that the sea foam broke up a lot of junk in the tank and that seized the pump. You may need to drop the tank to sort it out.
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Old 06-29-2013, 04:05 PM   #23
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Brand new pump.
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Old 06-30-2013, 05:22 PM   #24
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Where did you get this pump? Is it possible they gave you a wrong model? I have no experience with fuel pumps this is just kind of a shot in the dark
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Old 06-30-2013, 07:30 PM   #25
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Advance auto parts. It's the Bosch pump. I noticed my injectors are smoking a bit. Going to check all O2 sensors and possibly change the injectors. Any thoughts?
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Old 06-30-2013, 07:37 PM   #26
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I have never seen an injector smoke....

What is your battery voltage while running? Use a meter, not the dash gauge.
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Old 06-30-2013, 09:01 PM   #27
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Almost sound like a short.
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Old 07-01-2013, 01:01 PM   #28
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I've got to get more 30amp fuses.
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Old 07-01-2013, 05:11 PM   #29
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Quote:
Originally Posted by Jeep0321 View Post
I've got to get more 30amp fuses.
You are blowing 30 amp fuses, your injectors are smoking, and you are wondering whats wrong with your Jeep?

You have serious electrical issues....
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Old 07-01-2013, 09:36 PM   #30
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Smoking from cylinder 1 only. It was the residual seafoam.

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