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Unread 10-15-2013, 01:13 PM   #1
39019
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1993 FSJ Cherokee 
 
Join Date: Oct 2013
Location: newalla, ok
Posts: 6
K here's my issues. Bought jeep from a buddy he put a new engine in it and has never got it to run. I thought I could get it running lol no luck. It's been sitting a while so fuel pump was bad. I dropped tank cleaned it out and put new fuel pump in. It started up ran really rough and died. Pulled injectors out I had two clogged. Put two new injectors in it no luck. I think it might be out of time. Because when I had the injectors out seeing if they working it was spitting fuel kinda in injector holes and it was running. But as soon as I installed the injectors it wouldn't start.any advice would help at this point thank you.oh it has 4.0 inline six


Last edited by 39019; 10-15-2013 at 01:32 PM..
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Unread 10-15-2013, 06:49 PM   #2
uberxj92
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1992 XJ Cherokee 
 
Join Date: Oct 2012
Location: umatilla, florida
Posts: 1,961
Retime it yourself. Easier that way. Make sure you have break in oil in her.
New plugs and wires. Check all grounds and vacuum lines. Good battery. Check the cps.
When it first starts after a fresh build it will run like hell. It won't idle for a while. The ECM us running on basic operation and has to learn all over again. You'll want to run it around 1800 rpms for about 20 or 25 minutes. That seats in the engine. Then drive it a lot not over 3500 rpms constant for the first 500 miles. Change the oil to regular oil and filter at 1000 miles.
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Unread 10-15-2013, 07:04 PM   #3
39019
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1993 FSJ Cherokee 
 
Join Date: Oct 2013
Location: newalla, ok
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K thanks. I reset the distributor it started up ran really rough died wouldn't start again. I checked fuel pressure. Zero. I took fuel pressure regulator off my 1995 jeep and swaped them out no luck. I'm thinking my fuel rail could be bad. Or the o-rings on FPR?
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Unread 10-16-2013, 12:41 AM   #4
uberxj92
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1992 XJ Cherokee 
 
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Location: umatilla, florida
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If the o rings are bad then yea but there'd be fuel dripping there. Brand new pump? Filter?
Can you hear the pump prime?
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Unread 10-16-2013, 05:39 AM   #5
39019
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1993 FSJ Cherokee 
 
Join Date: Oct 2013
Location: newalla, ok
Posts: 6
Yea it was leaking fuel on the regulator. I found some o-rings at the house(not the right ones) but it fixed the leak but the fuel just spits back down the return line instead of holding pressure. And yes new pump and filter. I'll pick up the right o-rings today and see if that fixes it.
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Unread 10-23-2013, 08:14 AM   #6
39019
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1993 FSJ Cherokee 
 
Join Date: Oct 2013
Location: newalla, ok
Posts: 6
K got new fuel rail put it on and got really good fuel pressure it started up idled real high and when I shut it off it it wouldn't restart. Cked plugs no fire now. Replaced CPS and still no fire. I read a few threads about no fire issues and some say could be bad grounds. I've noticed a lot of grounds not hooked up so ill hook them all up and see what happens.
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Unread 10-23-2013, 02:15 PM   #7
uberxj92
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Yep grounds every time
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Unread 10-27-2013, 03:10 PM   #8
39019
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1993 FSJ Cherokee 
 
Join Date: Oct 2013
Location: newalla, ok
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Well all grounds good still no fire but I did get to thinking about the engine that is in it now. The jeep and the old engine that was in it was 1993 model. So I found the vin on the block if the engine that is in it now and it's a 1987 model. Could that be a problem? The block numbers say 8933002665 and I also saw an 87 stamped close by
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Unread 10-28-2013, 12:39 AM   #9
uberxj92
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1992 XJ Cherokee 
 
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Location: umatilla, florida
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Did he use the 93 sensors, injectors, and throttle body? If the engines an 87 then it would be different in 2ways.
1: its a non high output head. Unless they put on an h/o head and fuel rail/ injectors.
2: 87-90 were renix systems. You can't interchange the renix sensors with 91 up.
You cam use the 87 engine with the 93 parts like fuel rail injectors sensors.
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Unread 10-28-2013, 06:00 AM   #10
39019
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1993 FSJ Cherokee 
 
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Location: newalla, ok
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Well I know for sure that the fuel rail is a 93. But wait a minute now I remember when my buddy put the engine in he said none of sensor plugs were the same so he spliced the wires and changed the plugs on the wire harness. Hmm could it be that simple now? Should I go to salvage yard and get all the sensors and plugs off a 93 and put them on?
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Unread 10-28-2013, 10:51 AM   #11
uberxj92
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There ya go. Sounds like he used the 87 parts. Hopefully he didn't mess up the splicing and damage the ecm. Keep us up on it.
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