Stephen staly Posted November 19, 2022 Share Posted November 19, 2022 I have an 86 Jeep Comanche 2.5 l with a four speed stick shift recently added a tachometer and I went to drive it and realized maybe it's not as underpowered as I thought and I was shifting super early. I went to take it above 3,000 RPM and it just died and it'll do it every single time no matter what gear you're in. Spark plugs and wires are good. They are new fuel tank and pump is new. I'm really stumbled here. What could possibly be the problem. Maybe it needs an oxygen sensor or I have no idea if anybody has any ideas or have had this problem. I would really appreciate the help Link to comment Share on other sites More sharing options...
Ωhm Posted November 19, 2022 Share Posted November 19, 2022 Disconnect the 'recently added tach', then try again. Link to comment Share on other sites More sharing options...
Stephen staly Posted November 19, 2022 Author Share Posted November 19, 2022 1 hour ago, Ωhm said: Disconnect the 'recently added tach', then try again. Just tried that. It's still doing it. Any other ideas Link to comment Share on other sites More sharing options...
eaglescout526 Posted November 19, 2022 Share Posted November 19, 2022 When you put in the new pump, did the sock on the end feel loose at all? Link to comment Share on other sites More sharing options...
gogmorgo Posted November 19, 2022 Share Posted November 19, 2022 When you say it dies, like, does the engine stumble and quit or is it like you shut the key off? Link to comment Share on other sites More sharing options...
Stephen staly Posted November 19, 2022 Author Share Posted November 19, 2022 2 hours ago, gogmorgo said: When you say it dies, like, does the engine stumble and quit or is it like you shut the key off? It literally completely shuts off. And sometimes if you gas it too quick it wants to die as well but everything was completely new Link to comment Share on other sites More sharing options...
Stephen staly Posted November 19, 2022 Author Share Posted November 19, 2022 3 hours ago, eaglescout526 said: When you put in the new pump, did the sock on the end feel loose at all? Nope everything was good I replaced the entire assembly Link to comment Share on other sites More sharing options...
Stephen staly Posted November 19, 2022 Author Share Posted November 19, 2022 2 hours ago, gogmorgo said: When you say it dies, like, does the engine stumble and quit or is it like you shut the key off? If you're trying to take off say you give it half or full pedal it's like you turned the key off But if you push the clutch in, wait a second and let the clutch out. It'll start back up and then if you do it again it'll turn back off again Link to comment Share on other sites More sharing options...
Stephen staly Posted November 19, 2022 Author Share Posted November 19, 2022 2 hours ago, gogmorgo said: When you say it dies, like, does the engine stumble and quit or is it like you shut the key off? I don't know if it has anything to do with it, but it smells super rich while it's running Link to comment Share on other sites More sharing options...
eaglescout526 Posted November 19, 2022 Share Posted November 19, 2022 Perhaps it’s dumping fuel. I only ask about the sock cause mine broke loose in the tank and stopped flow of fuel above 2k Link to comment Share on other sites More sharing options...
Stephen staly Posted November 19, 2022 Author Share Posted November 19, 2022 2 minutes ago, eaglescout526 said: Perhaps it’s dumping fuel. I only ask about the sock cause mine broke loose in the tank and stopped flow of fuel above 2k I could try removing the tank and checking it. It's not shutting off at that low of RPM but never know. Also, the idle is a little inconsistent. Sometimes it runs smooth. Sometimes it runs rough. It literally varies. That's why I was wondering if the O2 sensor was bad Link to comment Share on other sites More sharing options...
Stephen staly Posted November 19, 2022 Author Share Posted November 19, 2022 5 minutes ago, eaglescout526 said: Perhaps it’s dumping fuel. I only ask about the sock cause mine broke loose in the tank and stopped flow of fuel above 2k When that happened to you, did the engine shut off completely? Because mine literally dies. Totally not running anymore at all. It'll start back up but if you hit that certain RPM again, it'll shut off again Link to comment Share on other sites More sharing options...
eaglescout526 Posted November 19, 2022 Share Posted November 19, 2022 O2 can be a cause of erratic idle. But we recommended cleaning your ground before we diagnose sensors and such first. Mine didn’t really turn off at 2k but it definitely struggled to get fuel to the engine when the sock got sucked up by the pump. Link to comment Share on other sites More sharing options...
Stephen staly Posted November 19, 2022 Author Share Posted November 19, 2022 1 minute ago, eaglescout526 said: O2 can be a cause of erratic idle. But we recommended cleaning your ground before we diagnose sensors and such first. Mine didn’t really turn off at 2k but it definitely struggled to get fuel to the engine when the sock got sucked up by the pump. What do you mean by cleaning the ground? Mine completely turns off like if you push the gas pedal it does not rev up because the motor is not running Link to comment Share on other sites More sharing options...
eaglescout526 Posted November 19, 2022 Share Posted November 19, 2022 Like there’s Cruiser54’s tips we recommend every MJ owner do to eliminate any issues with their electronics. Link to comment Share on other sites More sharing options...
Stephen staly Posted November 19, 2022 Author Share Posted November 19, 2022 5 minutes ago, eaglescout526 said: O2 can be a cause of erratic idle. But we recommended cleaning your ground before we diagnose sensors and such first. Mine didn’t really turn off at 2k but it definitely struggled to get fuel to the engine when the sock got sucked up by the pump. Is there a way I can send you a video of it? So you can see exactly what's going on? Because I could probably do that tomorrow morning Link to comment Share on other sites More sharing options...
Stephen staly Posted November 19, 2022 Author Share Posted November 19, 2022 1 minute ago, eaglescout526 said: Like there’s Cruiser54’s tips we recommend every MJ owner do to eliminate any issues with their electronics. Well I know that the engine ground and all of that is good because when I had gotten the truck I put a new motor in it and replaced the engine ground Link to comment Share on other sites More sharing options...
eaglescout526 Posted November 19, 2022 Share Posted November 19, 2022 There’s a ground behind the drivers tail lamp that is for the fuel pump. Link to comment Share on other sites More sharing options...
Stephen staly Posted November 20, 2022 Author Share Posted November 20, 2022 19 minutes ago, eaglescout526 said: There’s a ground behind the drivers tail lamp that is for the fuel pump. Okay I can try to check that tomorrow. Do you want me to take a video so you guys can see what's going on? Link to comment Share on other sites More sharing options...
Stephen staly Posted November 20, 2022 Author Share Posted November 20, 2022 22 minutes ago, eaglescout526 said: There’s a ground behind the drivers tail lamp that is for the fuel pump. Also in your tag it says you have an 84 XJ hurricane carbed set up for four-wheel drive. Is it hard to swap these to carbureted and not deal with any of these issues? Because I've been wanting to switch mine to carbureted but everyone I've talked to said that there is no way because they don't make a HEI distributor for them Link to comment Share on other sites More sharing options...
eaglescout526 Posted November 20, 2022 Share Posted November 20, 2022 4 minutes ago, Stephen staly said: Also in your tag it says you have an 84 XJ hurricane carbed set up for four-wheel drive. Is it hard to swap these to carbureted and not deal with any of these issues? Because I've been wanting to switch mine to carbureted but everyone I've talked to said that there is no way because they don't make a HEI distributor for them My XJ came from the factory with a carb. I’m going to swap it tot TBI in the future. And yes a film of what’s going on might help us see what it is exactly doing. Link to comment Share on other sites More sharing options...
Stephen staly Posted November 20, 2022 Author Share Posted November 20, 2022 1 hour ago, eaglescout526 said: My XJ came from the factory with a carb. I’m going to swap it tot TBI in the future. And yes a film of what’s going on might help us see what it is exactly doing. I would gladly trade you everything lol but I'll try and get a video in the morning Link to comment Share on other sites More sharing options...
eaglescout526 Posted November 20, 2022 Share Posted November 20, 2022 It might be a while. I’m currently waiting to get a full set up from another member. Link to comment Share on other sites More sharing options...
Eagle Posted November 20, 2022 Share Posted November 20, 2022 2 hours ago, Stephen staly said: Because I've been wanting to switch mine to carbureted but everyone I've talked to said that there is no way because they don't make a HEI distributor for them Check junk yards for '84 and '85 XJ Cherokee 2.5L. Or ... https://www.summitracing.com/parts/aaz-84-4495/make/jeep https://shop.advanceautoparts.com/c3/distributors/16062?filterValue=isFitted_uFilter%3AExact Fit&term=distributor&categoryGroupId=16062 Link to comment Share on other sites More sharing options...
cruiser54 Posted November 20, 2022 Share Posted November 20, 2022 Go to www.cruiser54.com and complete Tips 1 through 5 as applicable. Also the fuel pump ground fix I will post in it's entirety. Check the hose from the throttle body to MAP sensor. Attachment shows the 4.0 but you get the idea. Check the vacuum hoses at the intake manifold. Make sure the intake manifold bolts are tight. Make sure vacuum hoses are routed correctly. CRUISER'S MOSTLY RENIX TIPS IMPROVING THE FUEL PUMP GROUND JANUARY 3, 2016 CRUISER54 54 COMMENTS EDIT The fuel pump and fuel tank sending unit ground at a sheet metal screw up behind the spare tire on an XJ, and behind the driver’s taillamp on an MJ. Not only is a sheet metal screw a lousy way to ground things, this ground path is long and travels through some connectors that are prone to corrosion and moisture. Locate the black wire on the HARNESS side of the fuel pump/sender 3 wire connector. Remove a 6″ length of the split loom covering. Strip back about 1/2″ of insulation from the BLACK wire. Take your new ground wire, preferably at least 14 gauge and 12 to 18 inches long as needed, strip it about 3/4″, and wrap it around the exposed part of the harness plug wire.Solder the connection. Tape it up and reinstall the split loom covering. At the other end of your new ground wire, add a crimp on eyelet. Attach the eyelet under a bolt that goes directly into the chassis. Be sure to clean the attaching point til shiny and apply OxGard to the contact surfaces. Until all of this is COMPLETED, not just gandered at, you're peeing into the wind. Link to comment Share on other sites More sharing options...
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