Jeep Comanche Build

Got the motor in the first time, bolted everything up, and it was only making a faint click, checked all the grounds and tested the battery and starter they were all good, someone mentioned checking the starter relay, so I did and noticed a wire had been disconnected accidentally so I connected it and the truck turned over...but no spark. So I decided to pull the motor forward and swap flywheels, that's all I got to last night, on my way over now for a few before school then going back over after that so expect an update later on tonight, hopefully with a video of it running well, here's a picture just to make it more interesting
[img]https://s1353.photobucket.com/user/Rob_Cinelli/media/Mobile%20Uploads/image_zpsweu1g1rn.jpeg.html?sort=3&o=0[img]

why would the flywheel prevent spark? does the crank position sensor read the flywheel and that's not happening?

Rob Cote wrote:why would the flywheel prevent spark? does the crank position sensor read the flywheel and that's not happening?

That's exactly it, at least that's what I've read on the one thread I could find about swapping this motor into a Comanche, so we will see if it works

Weird that they'd make that sort of change from one model to the other even though it's the "same" engine. That's like pretty fundamental, you know? Good luck bud. Hope that solves it.

Rob Cote wrote:Weird that they'd make that sort of change from one model to the other even though it's the "same" engine. That's like pretty fundamental, you know? Good luck bud. Hope that solves it.

I thought it was strange too, but hey at least I know that now.

SO, swapped out the flywheel last night, put everything back together turned the key, anddddd







she runs!
Not quite running great right now, I'm going to pick up a new O2 sensor tomorrow and see if that fixes the problem.

SIIIIICK nice work

Rob Cote wrote:SIIIIICK nice work

Thanks, I'm hoping to finish up the little things tomorrow and be good to bring it home tomorrow night. Then it's time to hook up my Boostwerks shift linkage finally, I know Andrew will be happy with that, instead of me crawling under the truck to engage 4wd Anybody want to take some parts off my hands? I have a bunch of spare motor parts for a 2.5, two good heads, some pistons, rods, a used but seems good water pump (XJ or MJ), power steering pump for a YJ, thermostat housing for YJ, good alternator for YJ, starter from my MJ, take anything for $5 each, heads would be $25 each I just want to recoup some money and help anyone out if they need it, I'll take a picture of it all tomorrow

Its alive!

Starting the dreaded heater core... Update to come later tonight

You're sweating a heater core replacement after doing a motor swap? The core should be nothing compared to that.

THOOPY3 wrote:You're sweating a heater core replacement after doing a motor swap? The core should be nothing compared to that.

I had never done one before and everyone says how bad they are, I pulled the dash pretty quick and had the hvac box out quick too, really wasn't too bad, going to put the new one in tonight, hoping I'll have an extra set of hands to help me line up the dash for now it's held in by the two 15mm bolts on the side while I drive it, sure is a lot colder with the openings in the firewall right now

Yeah it definitely helps having a second set of hands. Trying to line up the studs on the HVAC box with their corresponding holes in the fire wall without someone either directing or helping is definitely challenging.

Okay guys been way too long, sold the truck in January of 2016, regretted it and bought it back in November of 2016 as some of you know I went on two wheeling trips. Anyways, motor is junk because I may have forgot to add oil due to all the chaos of getting it to run... What was I thinking. So I recently bought a motor from low mileage parts and am not happy with it for the cost. Shipping it back and am hopefully pulling the trigger on a 4.0 4x4 Comanche to use as a donor. Much more work than I anticipated but for the price I can't beat it. https://hartford.craigslist.org/cto/6130778307.html That's the link to the donor.

I have three questions that I'm hoping can be answered. 1. Since both vehicles are renix I am under the impression I do not have the change out the interior harness, just the ECU... Does anybody know if this is correct? 2. I know I have to swap the fuel pump out to the 4.0 one, can I just mount that in my 2.5 gas tank? 3. I read that I need to cut up my front end to fit the 4.0 radiator but I'm thinking I can swap the front ends and not have to cut anything up? Going to look at the truck tomorrow and run a compression test hopefully it checks out good!