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Unread 10-12-2011, 12:34 AM   #1
beta2225
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1993 ZJ 
 
Join Date: Apr 2011
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Please give me 2 mins of help!! 93' 4.0l issues

First off I'd like to thank everyone on the forum for helping me with my jeep so many times without them actually knowing it! Second, I have a 1993 Jeep Grand Laredo with 80,000 miles on it and my issue is that I stored the jeep for 6 weeks at my shop, it had 1/4 tank of gas and I put some stabil in it, then when I went to drive the jeep after 6 weeks, I filled it up with chevron and put in some chevron fuel injector cleaner. After I did that with the gas, about once a week, for the next 3 weeks when I started the jeep, on a hot or cold start, it idled really rough. The first few times it idled rough, I gave it a little bit of gas and it would clear up after I got going a bit and would run perfect and wouldnt happen again for another week. Well finally, I went out to start the jeep and it started to idle really rough and I tried giving it a little gas but instead of clearing up like before, it just died and wouldnt re-start at all. So now the jeep will not start, but cranks and cranks. I thought it was the coil again(Ive replaced it 3 times), so i replaced it, and nope, not the problem. When I crank the jeep the tach doesnt even move, but all other gauges work normal. Do you guys think this sounds more like a crank position sensor or a fuel pump/filter issue? I tried listening for the fuel pump and I couldnt hear it when I had my brother turn the key, but I thought since it wasnt reading anything on the tach when I cranked it that it may be cps. Do you think the stabil and fuel cleaner dislogged some crap and my filter or injectors got clogged or fuel pump went out? I'm not looking for the exact answer, but just where I should start looking first from my info. p.s. I tried the swapping the ASD relay and fuel pump relay with other ones, but that wasnt the issue either. Thank you guys for any help.

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Unread 10-12-2011, 01:37 AM   #2
PeriwinkleZJ
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Camshaft position sensor, or crank sensor. Search the key trick, and see if you have any stored codes. They don't cost much, I'd replace them to rule them out.
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Unread 10-12-2011, 05:54 AM   #3
KoreaZJ
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Same symptoms my '94 had when the Crankshaft Position Sensor went out. PITA to replace without being on a lift.
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Unread 10-12-2011, 05:03 PM   #4
beta2225
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Cps first on my list...

Thanks guys for the help, Ill start with replacing the CPS and let you know what happens.
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Unread 10-13-2011, 01:49 PM   #5
beta2225
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CPS Bolt size?

So I went and got the CPS sensor last nite and Ive replaced one before, but I couldnt get the right combination of ratchet and attatchments to get the bolt to break loose, Does anyone on here have any write-ups with a picture of the ratchet tool they used. Ive searched and searched and can't find one. Also, Is the CPS bolt 7/16?
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Unread 10-13-2011, 02:26 PM   #6
somebody5788
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Never really thought of a crank position sensor as a hard job. Guess I never realized how much easier the lift makes it. Man I'm really spoiled with a lift.......
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Unread 10-13-2011, 02:35 PM   #7
cherrywaffle
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i cant tell you for sure, but in my experience on the 4.0 random bolts (mostly sensors) are in metric. try a 13 mm (close to a 7/16) attached to a flex-drive (looks like a rope made of metal wire. lets the drive bend while still being able to apply torque) attached to a ratchet. you should be able to get a 10 piece metric set for like 15 bucks at walmart
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Unread 10-13-2011, 07:11 PM   #8
KoreaZJ
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Try this with a couple of extensions.
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Unread 10-13-2011, 07:15 PM   #9
MStaffin
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universals are nice to use. I just used and extension and i think it was a 10mm (8-15mm) cant really remember. no lie it should take all of like 10-15min to do it. Get a decent one from napa with the paper on it. I got a autozone one and it crapped out just from me starting in driveway to move it so i can work on it.
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Unread 10-13-2011, 10:35 PM   #10
ratmonkey
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Should be 7/16" hex head. As the hole is tapped to 1/4x20.
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Unread 10-14-2011, 10:26 AM   #11
beta2225
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got it...sort of

So I replaced the CPS, the bolt was 11mm. It took about 5 or 6 extensions on my ratchet with a u-joint almost at the end, in all the ratchet was about 18" long and it was alot easier. It took me about 20 minutes w/o a lift to get it out and back in....Only to find out the CPS wasnt the problem! What else could cause my jeep not to start, and the tach not to work while cranking? could it be a cam shaft sensor?
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Unread 10-14-2011, 05:54 PM   #12
MStaffin
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Go through your basic checks. Do you have fuel,spark,air. A motor.needs all 3 to run. If one is missing fail. Quick check, try starting fluid.
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Unread 10-14-2011, 06:26 PM   #13
DeansWings
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Check your fuses yo! I had an o2 sensor wire bundle brushing against my drive shaft for some time, and every so often the worn bare wire shorted on the shaft blowing some random (can't remember which). But same thing, crank but no ignition. Tried starting fluid in the throttle body... sounded like an AK-47. not saying that's your problem, but something stupid like a 10 amp fuse can kill ya.
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Unread 10-14-2011, 09:18 PM   #14
MJKR
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Check for spark. I have had coils go bad .
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