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Go Back JeepForum.com > Models > Jeep Grand Cherokee & Commander Forums > WJ Grand Cherokee Forum > 4.0 Engine swap complete but won't start... Please Help!!

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Unread 11-18-2013, 03:46 PM   #16
semajeep
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I am gonna try to work on it again soon, we had a lot of storms roll through West Michigan last night and they are saying my power won't be back on for a few days. When I get a chance I will pull the oil drive unit back out, return #1 to TDC on the compression stroke and align the timing marks again, then throw the toothpick back in place and drop the oil drive back in.... Again. Can anybody chime in and tell me if I'm aligning the mark on the balancer to right mark on the timing cover? I posted a pic of the marks I'm using in an earlier post...

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Last edited by semajeep; 11-18-2013 at 08:01 PM..
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Unread 11-18-2013, 06:28 PM   #17
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Should have a chance to work on it soon, will give an update later.
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Last edited by semajeep; 11-20-2013 at 07:47 PM..
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Unread 11-20-2013, 07:59 PM   #18
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Finally got a chance to work on the jeep. Unhooked the battery on it and charged the battery last time I finished working on it. It's been a couple days. Had to give it a little gas to start it but it started up and after feathering the gas for a few min's it idled pretty good! Tapped on the IAC and it seemed to get even better! Adjusted the cam sensor and again a little better! Then it sputtered a little, and started sounding like it was missing a little, now it's back to running like crap again, and I have to keep my foot on the gas to keep it running.... WTF?? Getting really frustrated. Should I try a new IAC? I cleaned the throttle body when I switched it over to this engine but didn't remove the sensors when I did It because I broke both my T-20 torx bits trying to get the sensors off. I did use sensor safe throttle body cleaner (not carb cleaner) but I also know from experience on my TJ that the sensors on the throttle body are pretty sensitive. Should I try new plugs now that I have had it running decent?The cam sensor should be close so I shouldn't have to worry about messing up the new plugs. Looking for some suggestions, thanks in advance.
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Unread 11-20-2013, 09:47 PM   #19
new2site
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Get a can of starting fluid ...have someone start it up with you at the engine holding the throttle a bit to keep it running and spray some of it around vacuum connections / etc to see if you have any vacuum leaks.
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Unread 11-21-2013, 08:02 AM   #20
semajeep
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If don't think it's a vacuum leak, but it doesn't hurt to rule it out, I will try that when I get home tonight.
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Unread 11-21-2013, 09:17 AM   #21
PeteYJTJ
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Do you know anyone who would let you borrow a throttle body assembly that you know is good? Maybe a buddy with another 4.0? Drive there, swap, test, swap back? You could eliminate a number of things that way.

Good luck
Pete
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Unread 11-21-2013, 01:29 PM   #22
semajeep
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I actually talked to my brother in law earlier and am gonna do a parts compatability check with his '01 XJ to see what parts are the same. Hopefully his entire throttle body assembly is "plug n' play". I will let you know what I find out.
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Unread 11-21-2013, 05:30 PM   #23
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Well, I checked parts compatability with my BIL's '01 XJ, all sensors are the same, so because he is out of town, I stole it for the night. I bolted up his throttle body and hooked the battery up. Hit the key and it ran really good! Let her run for 5 min or so and all was well. Shut it off and went in the house to eat dinner. Came back out 45 min's later and now it won't start again. It tries to start, then pops out the intake. I can't even get it to run by giving it gas. It was just running great and idling good before I shut it off, I never even had to touch the gas to get it to start. So now I unhooked the battery again, gonna try to reset the computer to see if it will start again. Any other ideas or suggestions??
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Unread 11-22-2013, 12:01 AM   #24
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Check your wiring harness where it curves around the back of the valve cover...maybe yours was on the brink (semi-common problem with 4.0 setup) from valve cover/head heat and when you did the swapout - moving it around you created a slight wire arcing situation.
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Unread 11-22-2013, 04:58 AM   #25
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It has to be an ignition fault, backfiring etc. would indicate this

Backfires are caused by a breakdown on the HT side.. have all the leads, coil packs, etc been changed for ones that are known good??
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Unread 11-22-2013, 07:41 AM   #26
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Well, you can rule out internal issues now. I doubt that you have two bad PCM's. Definitely check wire harnesses, battery/charging system, and engine and chassis grounds. Good luck.
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Unread 11-23-2013, 04:36 PM   #27
semajeep
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Got the jeep running good, again. Same deal as last time. Shut it off and started it back up a half a dozen times. All seemed good. Switched the throttle body back over to mine so I could give my brother in laws back and it won't start now. Switched the throttle body back over to the BIL's and it still won't start. Seemed like the last thing I messed with was the ignition coil plug wire before it started running good. Tried backtracking through it and moving it around and nothing. I checked resistance with the ohm meter and it shows the same resistance on each of the ignition coil circuits. Gonna have to get the wiring diagrams out and start tracing wires back to the PCM. Starting to get frustrated. Wires all seem in good condition. But only time will tell. Any suggestions on where to start? Any known problems in the ignition circuit I should be looking for?
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Last edited by semajeep; 11-23-2013 at 04:53 PM..
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Unread 11-24-2013, 07:16 PM   #28
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Well, I think I got it. The ignition coil plug was the culprit, and it also needs a new IAC Valve. This was my first time really messing with a WJ, usually it's an XJ or TJ. The WJ's are very "sensitive" to work on, especially the electronics. I found it's always a good idea to unhook the battery on them, even if just changing a sensor or something easy. Hopefully all is good now. I will repair and replace the parts necessary and hopefully be all set for awhile, if not, I know where to go now for advice. Thanks again to all that made suggestions and helped out.
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