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Unread 12-09-2011, 06:26 AM   #1
deviantjeep
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1993 ZJ 
 
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Need help with 93 Grand Cherokee ignition issues

So I recently bought a 93 ZJ, not my first jeep but it is my first grand. The guy I bought it from had it sitting in his garage for like 8 months with an empty fuel tank. When I filled the tank it stirred up alot of sediment, and fouled up the pump. So I dropped the tank cleaned it out, put a new pump in it and new filter, it ran fine for a day or two then crapped out again. I've since replaced the fuel injectors ( i went with the ev6 style 4 pintle injectors from a dodge neon etc...) and it's still not starting up. The engine turns...all day, but it just won't ignite. So my next thought was ignition systems, so i replaced my spark plugs and wires, the distributor cap has no visible breakdown or defaults and the rotor arm seems fine also, no corrosion and plenty of spring in it. I've tested the resistance of my ignition coil and it seems within tolerances. I'm completely out of ideas here, and my wife is friggin peeved off! PLS PLS PLS PLS HELP!

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Unread 12-09-2011, 06:55 AM   #2
maimedsk8er
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Have you checked your ignition fuse? What size of engine do you have?
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Unread 12-09-2011, 06:56 AM   #3
maimedsk8er
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Since it's been sitting for so long I'd be inclined to clean up all grounds and check all harnesses. Jeeps don't like dirty connections in the wiring, but love mud on the paint!!
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Unread 12-09-2011, 07:34 AM   #4
Azzy
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I hate to say it but...



Check yonder grounds, hit them with an ohmmeter and see if you get any resistance in the wires, they do get eaten from the inside out after a while. If it has the 4.0, check the TPS and CPS. Mainly the CPS, it will cause a crank but not start symptom. Also since you had the pump out and were working there, check your fuel rail for proper pressure, 30 lbs before start, 45-60 while running.
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Unread 12-09-2011, 09:06 AM   #5
deviantjeep
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Why wrong forum? This is Cherokee technical right?

As for the Jeep, it's a 4.0L Straight 6.

Yonder grounds? Whats these? and TPS/CPS what/where are these? I've checked the fuses nothing looks bad. All my electronics turn on....I also do not have a fuel pressure gauge...guess I should get one, I checked the line going to the rail, disconnected it and turned ignition to ON to let the pump turn on, I got fuel from that end, so I had figured it was getting adequate fuel.
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Unread 12-09-2011, 09:06 AM   #6
deviantjeep
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oh damn i did post in the wrong forum....my bad!
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Unread 12-09-2011, 09:24 AM   #7
maimedsk8er
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Quote:
Originally Posted by deviantjeep View Post
oh damn i did post in the wrong forum....my bad!
lol
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Unread 12-09-2011, 10:18 AM   #8
deviantjeep
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grr now it's here twice....doh!
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Unread 12-09-2011, 11:34 AM   #9
Azzy
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Yonder grounds... like yonder clouds or yonder house...

Go check your ground wires. 4.0 is sensitive on the ground wiring... it will and can cause all sorts of gremlins. Not sure where they might be on a GC though.

TPS - Throttle position sensor
CPS - Crankshaft Position sensor.
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