I_s2k Posted January 24 Share Posted January 24 Hey guys! I’m happy to say I just recently acquired a dream vehicle since I was kid….a 1986 Comanche! Body is in fairly decent shape but man does it run like ****! Does anybody have any tips and links for Comanches as a whole? In particular I’m looking for diagrams ie vacuum, electrical, sensors, part names etc. Currently the Jeep has the 2.5 with I’m assuming an AX-4 but that’s not confirmed. The problem I’m having is as soon as the clutch starts to grab in first or reverse(the only gears I’ve gotten to use because of the problem) and I give it gas, it stumbles and misfires and falls on its face. And it’s real temperamental as well, is the time the 2 times I’ve driven it, it more often than not stalls because of this but once or twice has been fine. Any insight would be appreciated. I’m no stranger to the XJ, I’ve had 6 and currently have a 96 on tons/40’s and boosted but they’ve all been 4.0’s with AW4’s 96+. Thanks again and I’m excited to join the MJ family! Excuse my GF in the background thinking “what am I looking at”😂 Link to comment Share on other sites More sharing options...
I_s2k Posted January 24 Author Share Posted January 24 I would also like to note that I do in fact know how to drive manual and the misfire is also at idle. I need to start with the basics but I won’t have time to mess with it till this weekend….just trying to feel the waters before I tear into it. Eventually it will be getting the 4.0/AX-15 treatment as well as 4x4. Link to comment Share on other sites More sharing options...
89 MJ Posted January 24 Share Posted January 24 I don’t know much about the 2.5, but I’d probably throw a cap, rotor, and plugs at it and run some seafoam in the fuel tank to try to clean everything up some. Also make sure you don’t have any vacuum leaks. @eaglescout526 might as well have a PhD in the 2.5 Link to comment Share on other sites More sharing options...
I_s2k Posted January 24 Author Share Posted January 24 3 minutes ago, 89 MJ said: I don’t know much about the 2.5, but I’d probably throw a cap, rotor, and plugs at it and run some seafoam in the fuel tank to try to clean everything up some. Also make sure you don’t have any vacuum leaks. @eaglescout526 might as well have a PhD in the 2.5 Haha well hopefully he has some input. I’ve never had to mess with one and I don’t plan on keeping it but for the time being I’d like it to at least run. I’m pretty positive it has at least one vacuum leak considering it’ll start and high idle for a bit. Unfortunately this one of the deals with wire nuts everywhere and the works haha. Link to comment Share on other sites More sharing options...
89 MJ Posted January 24 Share Posted January 24 Just now, I_s2k said: Haha well hopefully he has some input. I’ve never had to mess with one and I don’t plan on keeping it but for the time being I’d like it to at least run. I’m pretty positive it has at least one vacuum leak considering it’ll start and high idle for a bit. Unfortunately this one of the deals with wire nuts everywhere and the works haha. Ah, it’s a custom wiring job, that’ll be sure to make diagnosis more difficult Link to comment Share on other sites More sharing options...
I_s2k Posted January 24 Author Share Posted January 24 Just now, 89 MJ said: Ah, it’s a custom wiring job, that’ll be sure to make diagnosis more difficult Yuuuup unfortunately, I can say that the only lights that work on the entire Jeep is the headlights, fuel gauge intermittent, speedo needle is straight down, it’s mess right now. Yaaaay Link to comment Share on other sites More sharing options...
eaglescout526 Posted January 24 Share Posted January 24 What a basket case. Can we get some pics of the engine bay? I have a DIY on adjusting the ISA. It is highly recommended to go over cruiser54's tips and get those taken care of as well. If I can get some pics, I can help out. But theres a few things that would make it fall flat on its face. Vac leaks, manifolds not being snug to the block, MAP, TPS and or a bad head gasket. Link to comment Share on other sites More sharing options...
fiatslug87 Posted January 24 Share Posted January 24 You can download manuals here. Link to comment Share on other sites More sharing options...
eaglescout526 Posted January 24 Share Posted January 24 Hes gonna need an 86 electrical manual, which I do have. I really need to get all my books into a pdf. Or transcribe them. Link to comment Share on other sites More sharing options...
I_s2k Posted January 24 Author Share Posted January 24 6 hours ago, eaglescout526 said: What a basket case. Can we get some pics of the engine bay? I have a DIY on adjusting the ISA. It is highly recommended to go over cruiser54's tips and get those taken care of as well. If I can get some pics, I can help out. But theres a few things that would make it fall flat on its face. Vac leaks, manifolds not being snug to the block, MAP, TPS and or a bad head gasket. Yes I definitely can. Unfortunately I work 4 10’s so I won’t be off till like 5-6 MT time. I do have one on hand currently. And awesome thanks, I was sifting through cruiser54’s page before buying it, will definitely be spending more time there but it’s thought because I feel like the info is more for the 4.0. This is the only pic I have on hand of the engine bay rn. Link to comment Share on other sites More sharing options...
I_s2k Posted January 24 Author Share Posted January 24 Would like to note as well that the cat is cut off and does have a slight exhaust leak due to a test pipe being just u-bolted in its place but it’s not like a gaping hole or anything, aside from that I believe everything else is intact. Link to comment Share on other sites More sharing options...
cruiser54 Posted January 24 Share Posted January 24 Make sure the intake manifold is not loose and that the hoses below the throttle body are good. Plugs, wires, cap and rotor. Refresh the ground on the firewall per my Tip 1 at www.cruiser54.com. Link to comment Share on other sites More sharing options...
eaglescout526 Posted January 24 Share Posted January 24 Wow. Power steering delete all together. Is it a V-belt set up? Link to comment Share on other sites More sharing options...
GrandBoost98 Posted January 24 Share Posted January 24 13 hours ago, I_s2k said: I need to start with the basics Very basic, but are you sure its got good gas? It doesnt take long for gas to go bad. Mine sat for a few months before I bought it and had similar issues as youre having. I did a full tune up and most of cruisers tips without much change. Then I drained the tank and refilled with some fuel treatment and its been fine since. Link to comment Share on other sites More sharing options...
I_s2k Posted January 24 Author Share Posted January 24 5 hours ago, cruiser54 said: Make sure the intake manifold is not loose and that the hoses below the throttle body are good. Plugs, wires, cap and rotor. Refresh the ground on the firewall per my Tip 1 at www.cruiser54.com. Awesome, I’ll be sure to check that. Very good info on your site as well, thanks for that haha. Link to comment Share on other sites More sharing options...
I_s2k Posted January 24 Author Share Posted January 24 2 hours ago, eaglescout526 said: Wow. Power steering delete all together. Is it a V-belt set up? Yessir, PO Before the PO deleted the power steering pump and I think put plugs in the gearbox but not confirmed whether or not they’re actually there, I’m just assuming. Yes it has the main drive for alternator, crank, WP, etc. and the accessory drive for power steering. Link to comment Share on other sites More sharing options...
I_s2k Posted January 24 Author Share Posted January 24 30 minutes ago, GrandBoost98 said: Very basic, but are you sure its got good gas? It doesnt take long for gas to go bad. Mine sat for a few months before I bought it and had similar issues as youre having. I did a full tune up and most of cruisers tips without much change. Then I drained the tank and refilled with some fuel treatment and its been fine since. It’s very possible and could be contributing to the problem but I just thought it was odd that it does the sputter and miss intermittently, I mean it does it more often than not but a few times it’s ran fine. From what I understand the PO said it’s sat for year, the gas doesn’t smell horrible but I do plan to drain the tank and change the filter this weekend. Link to comment Share on other sites More sharing options...
GrandBoost98 Posted January 24 Share Posted January 24 I would drain and refill the tank. I had same intermittent problems. Was able to drive up and down my road on a few occasions so I thought I had it good enough to drive to a gas station and it stalled on me about a mile short lol but once I got fresh gas in there, it hasnt given me issues since. Well, not those issues at least Link to comment Share on other sites More sharing options...
eaglescout526 Posted January 24 Share Posted January 24 I know they existed but I’ve never seen an 84-86 2.5L with no PS pump or brackets. That’s probably factory. PS was an option still. Link to comment Share on other sites More sharing options...
GrandBoost98 Posted January 24 Share Posted January 24 My other 2.5L MJ had manual steering and V-belts, but it was an 88 Link to comment Share on other sites More sharing options...
I_s2k Posted January 24 Author Share Posted January 24 35 minutes ago, eaglescout526 said: I know they existed but I’ve never seen an 84-86 2.5L with no PS pump or brackets. That’s probably factory. PS was an option still. If it means anything the comanche is a "custom" trim, do know of anywhere I could get a build sheet to find out what about it is "custom". Link to comment Share on other sites More sharing options...
GrandBoost98 Posted January 24 Share Posted January 24 6 minutes ago, I_s2k said: know of anywhere I could get a build sheet https://comancheclub.com/forum/29-1986/ Link to comment Share on other sites More sharing options...
fiatslug87 Posted January 24 Share Posted January 24 We’re working on the build sheet for you. Link to comment Share on other sites More sharing options...
I_s2k Posted January 24 Author Share Posted January 24 1 minute ago, fiatslug87 said: We’re working on the build sheet for you. Oh okay awesome!! Link to comment Share on other sites More sharing options...
eaglescout526 Posted January 24 Share Posted January 24 37 minutes ago, GrandBoost98 said: 88 With V-belt?! I think we need to look at the date code on that block. Link to comment Share on other sites More sharing options...
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