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Old 02-24-2014, 10:24 PM   #1
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93 2.5 stray plug

Hey guys, I bought a 93 yj 2.5 cranks and won't start, backfires a plenty though. Read a lot of similar problems but none of those tips have helped yet. Replaced CPS and timing gears and chain. Also a new dizzy and coil, plugs, wires, cap, and rotor. Fuses and relays look and sound good. Had a code 11 and 54, those cleared with new parts and a reset. I've got spark and fuel, timing is correct (by the chiltons and other advice from keepers). Fuel pump is good. I have found a plug that is not plugged in and can't find anywhere to plug it in. It's on the drivers side down by the exhaust manifold and comes out the same wire loom as the O2 sensor. Oh and it's fairly large and round. Any thoughts.

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Old 02-25-2014, 03:09 PM   #2
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Picture of said plug? Good Spark? You've got the basics of combustion, air, spark and Fuel...

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Old 02-25-2014, 03:50 PM   #3
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Probably the plug for the power steering line. That boost engine rpm for the steering.
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Old 02-25-2014, 04:06 PM   #4
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I would look at your firing order again to make sure it is right. I would roll #1 to TDC and pull the dist cap and make sure it's pointing to the #1 plug wire on the cap.

Just a suggestion.
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Old 02-25-2014, 04:54 PM   #5
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Firing is good, 1342 is right? TDC on compression stroke has the rotor at #1. When it backfires I get smoke out of the dipstick and oil fill cap. Here's a pic of that plug:
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Old 02-25-2014, 05:37 PM   #6
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Alright, progress report: took the cat off just to check if it that was an issue but also unplugged the coolant temp sensor, I think (that little guy at the front if the engine at the thermostat housing?), and it fired off. Cat is back on, sensor unplugged and it runs, chitty chitty bang bang, but it runs. Replace that sensor and we should be, correct?
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Old 02-25-2014, 05:42 PM   #7
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I believe this is the plug you took the picture of. It is connected to the power steering line.


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Old 02-25-2014, 07:00 PM   #8
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Quote:
Originally Posted by COAinPaso View Post
Alright, progress report: took the cat off just to check if it that was an issue but also unplugged the coolant temp sensor, I think (that little guy at the front if the engine at the thermostat housing?), and it fired off. Cat is back on, sensor unplugged and it runs, chitty chitty bang bang, but it runs. Replace that sensor and we should be, correct?
Yeah, that's the coolant sensor that feeds to the ECM.
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Old 02-25-2014, 08:46 PM   #9
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New coolant sensor is in and it runs. That's the good news. Bad news is that sounds like it's got some valve issues. Making strides though, this jeep didn't run when I got it, but we are getting there. As for the stray plug, makes sense that it is just hanging there because this yj does not have power steering. Thanks guys and I'll keep you posted on the valves.
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Old 02-26-2014, 05:13 PM   #10
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Quote:
Originally Posted by COAinPaso View Post
New coolant sensor is in and it runs. That's the good news. Bad news is that sounds like it's got some valve issues. Making strides though, this jeep didn't run when I got it, but we are getting there. As for the stray plug, makes sense that it is just hanging there because this yj does not have power steering. Thanks guys and I'll keep you posted on the valves.
was PS an option in 93? or did somebody remove it?
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Old 02-26-2014, 05:18 PM   #11
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Not sure on the power steering, absolutely none of the components for it on this one. So the jeep runs extremely rough and has a loud clatter to it as well. White smoke out of the exhaust, white smoke out of the oil fill, and I think water bubbling between the exhaust manifold and head! Cracked head?
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Old 02-26-2014, 06:59 PM   #12
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1995 was the first year power steering was standard equipment on the YJ's.

Sounds like you have a cracked head or a blown head gasket.
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Old 02-27-2014, 01:35 PM   #13
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At this point I would welcome just a cracked head! Here lies my problem:
Missing a valve off the the #4 spot on the head and the entire #4 piston. Anybody got a spare engine laying around?
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Old 02-27-2014, 04:42 PM   #14
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Holy carp!

I have my 89 block, but it needs to be completely rebuilt....
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Old 02-27-2014, 06:07 PM   #15
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Jesus. Condolences.
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Old 02-27-2014, 10:40 PM   #16
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R.I.P. Time for an upgrade???
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Old 02-28-2014, 03:58 PM   #17
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Yup, and I guess anything that runs is an upgrade at this point. Looking to just replace the engine so if you know of one that's itching to get into a jeep let me know!
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Old 03-01-2014, 06:02 AM   #18
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3 angry squirrels! Bummer. Good luck.
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Old 03-01-2014, 05:07 PM   #19
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Found a decent price on a rebuild, is there any sort of break in period?
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Old 03-05-2014, 11:27 AM   #20
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The missing valve and piston showed up...in the bottom of the oil pan.
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Old 03-14-2014, 11:27 AM   #21
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Power steering option

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Originally Posted by rstoltenberg1 View Post
was PS an option in 93? or did somebody remove it?
I have a 93 Wrangler S type and it has power steering. The line sheet that I got for it by VIN says that it came with it.
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Old 03-14-2014, 09:49 PM   #22
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I believe PS was standard in '93. There are only two options for the belt - AC, or no AC.

OP, I feel for you. I just had my '93 2.5 rebuilt. I pulled it and reinstalled it. The rebuild cost $1300. I would let them look at it first though. If it has that kind of damage it might be beyond salvageable.

Those pictures - wow. I just burst out with "holy shit" when I saw them.
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Old 03-14-2014, 10:10 PM   #23
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Wow I did a holy shit too . Cant fail much worse that that. Amazed it ran at all. They certainly can be a money pit ...... but there again they are our money pits
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Old 03-15-2014, 12:01 AM   #24
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When I think about that first moment when I saw a gaping hole in the block (missing piston) it almost makes me laugh. Only because I know that PO took the engine apart, saw that, said "holy $#it," put it back together and sold it cheap. 1600 for the broken jeep and 1100 for a reman, I guess 2700 isn't bad for a yj with a brand new engine. A few other new parts too though: clutch, a couple of sensors, distributor, and front floor boards. It's been fun so far, I've done a lot of work to lots of cars, trucks, tractors and wheelers, but never a whole engine before. I'll post some pics when she's back on her feet. Also glad you guys see it and say the same thing I did, maybe even laugh a little
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Old 03-22-2014, 10:21 PM   #25
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Update and a quick question: new engine finally arrived and the guys knocked three hundred of the price because it took so long. Took a full day to get it installed and check, double and triple check electrical, vacuum and timing but it fired right up. However, it had a light banging noise and turns out the crank was barely tapping the dipstick tube, can I just bend the tube away from the crank a little or is this a bad idea?
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Old 03-22-2014, 10:48 PM   #26
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Holy Crap, I thought I had bad luck!!!!

I was just under mine yesterday with the pan off, you should be able to bend the tube out away from the crank as long as you don't get radical enough with it to alter the reading it gives on the dipstick. My tube ran about parallel with the oil pick up tube, which if memory serves...the tube was angled slightly to the front of the vehicle and was not angled any inward toward the crank.

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