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No Idle Help!
1994 XJ 4.0
I have a no idea situation on my XJ, MAP is good, IAC is good but it will not idle. I have good fuel and I can get a rough idle for a few seconds but I have to constantly pump the gas to keep it going for those few seconds. Could this be the TPS bad? The engine hasn't ran in a year I bought it not running as a project. Any ideas? What I've done Coil pack New plugs and wires CPS Cam shaft position sensor Fuel pump Fuel filter MAP IAC |
what happens when you start the jeep? does it run rough and then die, or runs normal and dies when you stop applying throttle?
in my experience tps won't do that, i had completely removed mine and all it did was not shift out of 1st (again, that's from my experience, maybe there's something else to it but I doubt it) if it runs rough i would check the downstream o2 sensor |
Originally Posted by Cane
(Post 3331229)
what happens when you start the jeep? does it run rough and then die, or runs normal and dies when you stop applying throttle?
in my experience tps won't do that, i had completely removed mine and all it did was not shift out of 1st (again, that's from my experience, maybe there's something else to it but I doubt it) if it runs rough i would check the downstream o2 sensor It's runs very rough and just for a few seconds for you pump the throttle or hold it down. |
Originally Posted by Cane
(Post 3331229)
what happens when you start the jeep? does it run rough and then die, or runs normal and dies when you stop applying throttle?
in my experience tps won't do that, i had completely removed mine and all it did was not shift out of 1st (again, that's from my experience, maybe there's something else to it but I doubt it) if it runs rough i would check the downstream o2 sensor |
Did it get stored for a year because it stopped running, or was it running fine but then wouldn't start after a year of sitting? Verify you have fuel pressure and that the plug wires are hooked up in the right sequence. Maybe an animal made a home in the air box lol :devil:
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Originally Posted by Fsher21
(Post 3332554)
Did it get stored for a year because it stopped running, or was it running fine but then wouldn't start after a year of sitting? Verify you have fuel pressure and that the plug wires are hooked up in the right sequence. Maybe an animal made a home in the air box lol :devil:
I will update once I have done all of this and see what happens. |
1 Attachment(s)
Originally Posted by Fsher21
(Post 3332554)
Maybe an animal made a home in the air box lol :devil:
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Clean the AIC? How's the battery and cables?
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Originally Posted by Waynerd
(Post 3333459)
Clean the AIC? How's the battery and cables?
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These types of posts tend to get common this time of year as the temperature drops and the ambient moisture increases. Although many things can cause a fire/bad idle situation, the first and easiest thing you should be checking is your electrical connections. Particularly, your ground connections. It sounds like your system is suffering from low voltage during startup. The computer will fire, but the low voltage will cause the computer to do some strange things, and continuing to run only when the gas pedal is depressed is one of them.
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Originally Posted by jordan96xj
(Post 3333496)
These types of posts tend to get common this time of year as the temperature drops and the ambient moisture increases. Although many things can cause a fire/bad idle situation, the first and easiest thing you should be checking is your electrical connections. Particularly, your ground connections. It sounds like your system is suffering from low voltage during startup. The computer will fire, but the low voltage will cause the computer to do some strange things, and continuing to run only when the gas pedal is depressed is one of them.
https://www.youtube.com/watch?v=AZ1yhT6ywp8 |
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