Knucklehead97 Posted November 14, 2013 Share Posted November 14, 2013 Walked beside my truck today, was about to test drive after doing an alignment. And smelled gas real bad in the engine bay. What I found was a soaked fuel injector (the third from the front of the engine) it seems to be coming from the part where the fuel injector connects to the fuel rail. I can't afford a new injector set right now, so what can I do and how do I do it? Link to comment Share on other sites More sharing options...
AeroNautical Posted November 14, 2013 Share Posted November 14, 2013 I had that exact problem, it was leaking where the metal met plastic, dripping pretty constantly. I just went to the JY and found 6 almost brand new injectors off a Grand Cherokee. The only fix I could find was a rebuild, but that would cost more than it was worth. I have 5 old but good injectors sitting around if you don't have any JYs around and don't want to spend the money on a new one. First Post: http://comancheclub.com/topic/38555-mjxj-parts-updated-regularly/ Link to comment Share on other sites More sharing options...
Blue88Comanche Posted November 14, 2013 Share Posted November 14, 2013 dads was leaking, we started by replacing all the o-rings. then we discovered one of the injectors were cracked. went to the JY and bought a set for fairly cheap. here are a couple pics i could find this one shoes the bag of orings Link to comment Share on other sites More sharing options...
Knucklehead97 Posted November 14, 2013 Author Share Posted November 14, 2013 I believe that mine is just an o-ring. Because I remember when I first bought the truck, that I bumped this same injector, and is started a small spray. But when I twisted it back to it's original position it was fine, until now. Where can I get a o-ring and how do I change it? I would rather try this before buying a used set just in case. I planned on upgrading to 703's when I got a job and everything else worked out on the truck. Thanks Link to comment Share on other sites More sharing options...
Blue88Comanche Posted November 14, 2013 Share Posted November 14, 2013 you can get a set of o rings from most any auto parts store, they usually come with a tool to help install them.. might as well replace all the injector o rings while you have the fuel rail off.. also would be a good time to clean the injectors. it took us about an hour or so to remove clean and re-install the injectors Link to comment Share on other sites More sharing options...
Bornindesert Posted November 14, 2013 Share Posted November 14, 2013 Rockauto or autoparts store for the o-rings. If you go on Rockauto, purchase one new injector just in case it's not the o-rings. Removing the fuel rail to replace injectors or o-rings is not that difficult, requires some patience. Relieve the fuel pressure by removing the cap and depressing the shraeder valve. If it's already leaked out, don't bother. There is a 13mm nut under where the left and right vacumm harness plug together, also a stainless clip that holds the fuel line. Pop the harness up and out of the U shaped holder and remove the nut. This will give you some freedom to wiggle the hard fuel line loose. To release the fuel line from the rail, squeeze and press the nylon retainer clip in and toward the valve cover, at the same time tug the hard line away from the valve cover. It should pop loose. Note the o-ring will either stay with the line or stay inside the rail. Locate it and save it for reassembly. Now you can remove the intake manifold bolts that attach the fuel rail to the intake. Next, is the tricky part...each fuel injector has a steel clip that holds the top of the injector to the fuel rail. It pops off pretty easy with the right pliers and flat head. Don't lose them, they are a dealer item and not cheap. With some patience, wiggling and gentle prying action, the fuel rail can then be separated from the injectors. It will remain attached to the return fuel line at the back, that's ok to leave connected. The injectors are still attached to the harness, each connector will separate from the injector, not too easily either. Need to be patient and careful, eventually they will come apart and snap back together. Replace O-rings, injectors, coat o-rings with some motor oil and reassemble. The back injector is a pain, just have to deal with hunching over and snapping it out to replace the o-rings. Link to comment Share on other sites More sharing options...
cruiser54 Posted November 14, 2013 Share Posted November 14, 2013 Hope it's o-rings, but it might not be...... Link to comment Share on other sites More sharing options...
Knucklehead97 Posted November 15, 2013 Author Share Posted November 15, 2013 Do the steel clips that connect the fuel injectors to the rail stay on the injectors or the fuel rail? How do I safely clean the injectors? The leak is definetely where the injector connects to the rail, the lower part of the injector is dry. If its not the O ring then Ill find a junkyard injector to get me through. Link to comment Share on other sites More sharing options...
Bornindesert Posted November 15, 2013 Share Posted November 15, 2013 The clips don't stay with either, they snap off and usually fling themselves into places only a flashlight can find. There is a lip on the clip that you can lever on to snap them off. Probably lots of ways to clean them but some parts cleaner and a coffee can is what I've used, and there's always a missing tooth brush involved lol. Link to comment Share on other sites More sharing options...
Knucklehead97 Posted November 15, 2013 Author Share Posted November 15, 2013 Well looks like tomorrow will be a fun day, then :D lets hope on it just being the o-ring. I'll keep ya'll posted on how it turns out Link to comment Share on other sites More sharing options...
ParadiseMJ Posted November 15, 2013 Share Posted November 15, 2013 The stock injectors are junk after the first 20 years LOL. They are two piece metal/plastic and the seam separates over time. Replacing them with what the parts store will give you will induce some major sticker shock ... $50 EACH. AKA $300 for 6. Wowzers!! A better option is something along these lines: http://www.ebay.com/itm/1-Year-Warranty-Jeep-Cherokee-Wrangler-4-0L-BOSCH-Upgrade-Fuel-Injector-Set-/281075415650?pt=Motors_Car_Truck_Parts_Accessories&hash=item4171667a62&vxp=mtr They come with new O-rings too. I replaced the ones in my XJ with these (or very similar to these) and liked them so much I got a set for the MJ. That was 4 years ago. Not a leak or hiccup since. BTW...word to the wise: Do NOT cheap out on a fuel leak, especially directly over a hot exhaust manifold. The result is almost always very bad. Link to comment Share on other sites More sharing options...
cruiser54 Posted November 15, 2013 Share Posted November 15, 2013 The stock injectors are junk after the first 20 years LOL. They are two piece metal/plastic and the seam separates over time. Replacing them with what the parts store will give you will induce some major sticker shock ... $50 EACH. AKA $300 for 6. Wowzers!! A better option is something along these lines: http://www.ebay.com/itm/1-Year-Warranty-Jeep-Cherokee-Wrangler-4-0L-BOSCH-Upgrade-Fuel-Injector-Set-/281075415650?pt=Motors_Car_Truck_Parts_Accessories&hash=item4171667a62&vxp=mtr They come with new O-rings too. I replaced the ones in my XJ with these (or very similar to these) and liked them so much I got a set for the MJ. That was 4 years ago. Not a leak or hiccup since. BTW...word to the wise: Do NOT cheap out on a fuel leak, especially directly over a hot exhaust manifold. The result is almost always very bad. Excellent advice^^ right there. Link to comment Share on other sites More sharing options...
Knucklehead97 Posted November 15, 2013 Author Share Posted November 15, 2013 Is that 90$ for the full set? I was figuring they would be that much apiece. Was there any sign of better gas mileage or power after the swap? I may take some scrap metal just to get them. So many things just keep happening with my truck and I'm running out of money to spend :/ Life of having a old Jeep to fix up. Link to comment Share on other sites More sharing options...
cruiser54 Posted November 15, 2013 Share Posted November 15, 2013 Yes, a set. Better idle and throttle response. Mileage? Not really. Chances of your Jeep burning to the ground? All but eliminated. Link to comment Share on other sites More sharing options...
yxmj Posted November 15, 2013 Share Posted November 15, 2013 And fyi you do not have to just watch for jeep injectors in the JY Dodge neon as well as ford injectors are regularly swapped in during stroker builds Link to comment Share on other sites More sharing options...
Knucklehead97 Posted November 15, 2013 Author Share Posted November 15, 2013 I'm going to order them later. Looking forward to throttle response, actually :D Link to comment Share on other sites More sharing options...
ComancheKid45 Posted November 15, 2013 Share Posted November 15, 2013 here's another set, a bit cheaper.....I run these injectors in all 4 of my Jeeps and have noticed improvements in each 1. http://www.ebay.com/itm/4-0L-4-0-Flow-Matched-Jeep-Grand-Cherokee-Fuel-Injectors-4-Hole-Upgrade-93-95-/171173385253?pt=Motors_Car_Truck_Parts_Accessories&fits=Year%3A1989%7CMake%3AJeep&hash=item27daba9425&vxp=mtr Link to comment Share on other sites More sharing options...
Knucklehead97 Posted November 15, 2013 Author Share Posted November 15, 2013 I ordered the 65$ set. They're only GenII instead of GenIII like the 90$ ones, but still 4-hole quality refurbished. And the seller had 100% positive feedback. Link to comment Share on other sites More sharing options...
ComancheKid45 Posted November 15, 2013 Share Posted November 15, 2013 Cool deal, let us know how you like them after you get em installed ;) Link to comment Share on other sites More sharing options...
Knucklehead97 Posted November 21, 2013 Author Share Posted November 21, 2013 Fuel injectors are almost in. But... while tightening a bolt, I slipped and broke a plastic piece of the throttle wire (i think thats what it is?) Its the cable coming from the cab that connects to the lever that then splits into a pole which moves the butterfly valve in the throttle body. I broke the plastic casing around a spring? Where can I get this, how muchdoes it cost, and whats it called? It sucks not getting to crabk my truck once I get the new injectors in Link to comment Share on other sites More sharing options...
Knucklehead97 Posted November 23, 2013 Author Share Posted November 23, 2013 New injectors are in, new throttle cable too. Went to crank it and it started for a split second and died. Now it won't even try. I think its flooded cause I smell gas. No injectors are leaking at all. What should I do guys? Please help! Link to comment Share on other sites More sharing options...
ComancheKid45 Posted November 23, 2013 Share Posted November 23, 2013 Recheck all your vacuum lines (ie. MAP sensor) and TPS, IAC Plugs. You did remember to take the caps off of the injectors prior to installing in the manifold didnt ya?....lol just checking Link to comment Share on other sites More sharing options...
Knucklehead97 Posted November 23, 2013 Author Share Posted November 23, 2013 Caps? There were no caps, I think. I could see the four little holes on the tip and the big hole on the fuel rail end. Link to comment Share on other sites More sharing options...
Knucklehead97 Posted November 23, 2013 Author Share Posted November 23, 2013 I pulled a spark plug and it was wet with gas. There was alot of carbon buildup in the engines fuel injector ports, which I cleaned out and a good bit of it fell in the engine. And all of my vacuum harness was connected right. Tps and iac were plugged in as well. I think it just needs to let the gas dissipate. It started right up everytime before the injector started leaking and I had to get these new ones. Link to comment Share on other sites More sharing options...
cruiser54 Posted November 23, 2013 Share Posted November 23, 2013 My money's on the fact that your throttle body to MAP sensor tube/hose got broken in the process or the MAP sensor is unplugged. Link to comment Share on other sites More sharing options...
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