NC Tom Posted March 8, 2023 Share Posted March 8, 2023 Starting a new topic concerning my retarded fuel injector, supposed upgrade. Everything is back together I think. I have looked for any loose connectors, hoses, vacuum lines, etc. Image posted of what I found, but I'm not sure what I found wasn't already as is. Uploaded audio of truck trying to to start. Never catches, just goes round-n-round. Checked CPS, looks fine. Connection seemed okay. Ran fine before I screwed with it. Just don't understand engines, I guess. Should I just clean the stock injectors and put them back? Really need some guidance here. SPECIAL NOTE: If, like me, you think it would be cool to work on your truck, but, like me, you're a Greenhorn. I highly suggest buying the parts and having someone who knows what the frick they're doing to put them on. This is ridiculous! 474446726_NoteasyVideo.m4a Link to comment Share on other sites More sharing options...
Pete M Posted March 9, 2023 Share Posted March 9, 2023 does anything happen is you pour a small amount of gas in the TB and then crank? Link to comment Share on other sites More sharing options...
NC Tom Posted March 9, 2023 Author Share Posted March 9, 2023 8 hours ago, Pete M said: does anything happen is you pour a small amount of gas in the TB and then crank? I'll check. What would that mean? Link to comment Share on other sites More sharing options...
cruiser54 Posted March 9, 2023 Share Posted March 9, 2023 See if you knocked a wire or 2 off the fuel pump ballast resistor. Link to comment Share on other sites More sharing options...
NC Tom Posted March 9, 2023 Author Share Posted March 9, 2023 5 minutes ago, cruiser54 said: See if you knocked a wire or 2 off the fuel pump ballast resistor. Okay. Thank you! Link to comment Share on other sites More sharing options...
NC Tom Posted March 9, 2023 Author Share Posted March 9, 2023 Nope. They're on. Seem tight. Link to comment Share on other sites More sharing options...
cruiser54 Posted March 9, 2023 Share Posted March 9, 2023 does it even TRY to start? Unplug and plug back in your CPS. Make sure the line from the throttle body to MAP sensor isn't messed up. Link to comment Share on other sites More sharing options...
NC Tom Posted March 9, 2023 Author Share Posted March 9, 2023 56 minutes ago, cruiser54 said: does it even TRY to start? Unplug and plug back in your CPS. Make sure the line from the throttle body to MAP sensor isn't messed up. Yeah, it turns but won't catch. I checked the CPS. I don't think I checked the MAP to the TB. I'll look at that after work. Link to comment Share on other sites More sharing options...
Pete M Posted March 9, 2023 Share Posted March 9, 2023 2 hours ago, NC Tom said: I'll check. What would that mean? if it tries to fire, that means the problem is in the fuel delivery. if it doesn't try to fire, that means spark is gone. Link to comment Share on other sites More sharing options...
NC Tom Posted March 9, 2023 Author Share Posted March 9, 2023 2 minutes ago, Pete M said: if it tries to fire, that means the problem is in the fuel delivery. if it doesn't try to fire, that means spark is gone. So, more than likely the injectors are not working? I changed nothing else. Link to comment Share on other sites More sharing options...
NC Tom Posted March 9, 2023 Author Share Posted March 9, 2023 @Pete M and @cruiser54, I posted an audio file in this thread. You can hear what it's doing. Link to comment Share on other sites More sharing options...
howeitsdone Posted March 9, 2023 Share Posted March 9, 2023 Another easy test is to turn the key to 'ON' and make sure you hear the fuel pump. Then turn off and depress the fuel rail valve to ensure it built pressure. If so, then either your injectors aren't firing or you have no spark. You can also remove a spark plug to see if it's covered in fuel. Link to comment Share on other sites More sharing options...
mjeff87 Posted March 9, 2023 Share Posted March 9, 2023 Like Pete mentions, pour a small amount of fuel into the TB and see if it fires (or a very short blast of starting fluid). Are the plugs wet after cranking like that? Assuming you got all the injector wires hooked back up to the correct injectors. Each plug has a different wire color so you can check. The harness pretty much stays in place once disconnected, but the middle cylinders can get messed up/swapped if you're not careful. #1 - light blue 2 - light green 3 - tan 4 - yellow 5 - white 6 - brown Link to comment Share on other sites More sharing options...
NC Tom Posted March 9, 2023 Author Share Posted March 9, 2023 10 minutes ago, howeitsdone said: Another easy test is to turn the key to 'ON' and make sure you hear the fuel pump. Then turn off and depress the fuel rail valve to ensure it built pressure. If so, then either your injectors aren't firing or you have no spark. You can also remove a spark plug to see if it's covered in fuel. Okay. The fuel pump is working, but I have not checked for pressure. On my list now! Link to comment Share on other sites More sharing options...
NC Tom Posted March 9, 2023 Author Share Posted March 9, 2023 2 minutes ago, mjeff87 said: Like Pete mentions, pour a small amount of fuel into the TB and see if it fires (or a very short blast of starting fluid). Are the plugs wet after cranking like that? Assuming you got all the injector wires hooked back up to the correct injectors. Each plug has a different wire color so you can check. The harness pretty much stays in place once disconnected, but the middle cylinders can get messed up/swapped if you're not careful. #1 - light blue 2 - light green 3 - tan 4 - yellow 5 - white 6 - brown Sure. I taped them before removing. But I'll check again. Link to comment Share on other sites More sharing options...
boxyjeep Posted March 9, 2023 Share Posted March 9, 2023 2 hours ago, NC Tom said: Sure. I taped them before removing. But I'll check again. Even with the connections swapped, there is a good chance it will still run (albeit somewhat poorly). What injectors did you swap in and why did you do the swap? Link to comment Share on other sites More sharing options...
NC Tom Posted March 9, 2023 Author Share Posted March 9, 2023 20 minutes ago, SoCalJeepComanche said: Even with the connections swapped, there is a good chance it will still run (albeit somewhat poorly). What injectors did you swap in and why did you do the swap? Bosch 0280155700. I had leaks and figured I'd "upgrade" to a 4-hole. Link to comment Share on other sites More sharing options...
NC Tom Posted March 15, 2023 Author Share Posted March 15, 2023 On 3/9/2023 at 9:04 AM, howeitsdone said: Another easy test is to turn the key to 'ON' and make sure you hear the fuel pump. Then turn off and depress the fuel rail valve to ensure it built pressure. If so, then either your injectors aren't firing or you have no spark. You can also remove a spark plug to see if it's covered in fuel. Okay, I can hear the fuel pump, but nothing happens when the fuel rail valve is depressed. Before this work, I would get small amount of fuel and could tell pressure was releasing. Do I need to leave the pump running for a bit to build pressure after having the fuel rail off? Link to comment Share on other sites More sharing options...
howeitsdone Posted March 15, 2023 Share Posted March 15, 2023 If you leave the key 'ON' then it should spray out fuel when the schrader valve is pressed in. When it's off, it should mostly trickle out at a rapid pace. It only takes a few seconds to build the required pressure. Link to comment Share on other sites More sharing options...
cruiser54 Posted March 15, 2023 Share Posted March 15, 2023 How long have you cranked it over since the injector replacement? Should start up after a few tries. Link to comment Share on other sites More sharing options...
NC Tom Posted March 15, 2023 Author Share Posted March 15, 2023 1 hour ago, howeitsdone said: If you leave the key 'ON' then it should spray out fuel when the schrader valve is pressed in. When it's off, it should mostly trickle out at a rapid pace. It only takes a few seconds to build the required pressure. Key on, no spray. Link to comment Share on other sites More sharing options...
NC Tom Posted March 15, 2023 Author Share Posted March 15, 2023 1 hour ago, cruiser54 said: How long have you cranked it over since the injector replacement? Should start up after a few tries. Several. Just turns and turns and turns ... Link to comment Share on other sites More sharing options...
jdog Posted March 17, 2023 Share Posted March 17, 2023 Can we get a full shot of the area of the injectors? A shot of the front of the rail and a shot of the rear of the rail Link to comment Share on other sites More sharing options...
zomeizter Posted March 17, 2023 Share Posted March 17, 2023 If you know for sure there is no fuel delivery/pressure but you hear the pump operate, it's time to pull the pump out and inspect it. My XJ did something similar to your situation, one day it just wouldn't start but I could hear the pump operate and a fuel pressure gauge at the rail port read zero pressure. The issue was a clogged fuel pump strainer, 5 bucks and a few beers later the XJ was back in business... Link to comment Share on other sites More sharing options...
NC Tom Posted March 17, 2023 Author Share Posted March 17, 2023 8 hours ago, jdog said: Can we get a full shot of the area of the injectors? A shot of the front of the rail and a shot of the rear of the rail Images here! Link to comment Share on other sites More sharing options...
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