Whats going on with my Jeep!!!!

Jul 16, 2008 11 Replies
G

Heres the problem. Runs ok in the morning. Can make it to work. Afternoon, sputtering, stalling, intake backfiring, no acceleration. Almost did not make it home from work today. Corrective action I took, new map sensor, plugs, cap, fuel filter, coil, oxegen sensor. What the hell is going on with this thing? Injectors? timing? fuel pump? I did get a fault code for lean mixture, but thought it was the CO2 sensor. Apparently not. I don't know what to think.



Thanks, Greg


95 YJ, 4.0, 4" BDS, Rear Detroit, 33's
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K

After you replaced the sensor, did you clear the codes? Disconnect the battery for about 15 minutes and reconnect. Then drive it, sometimes takes awhile to clear them.

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E

Why didn't you replace the plug wires? Vehicle age says it needs them anyway if not already done.

Earle

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L

Clear the fault codes and look for that lean mixture one again.

You might also want to post the ambient temperature range where you are driving to see if that is contributing to what sounds like a classical manifold leak or vapor lock.

Plug wires > Why didn't you replace the plug wires? Vehicle age says it needs them

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E

It's still time to replace them. Vapor lock on a FI system with a return line? Possible, but low on my list. You don't want to be too confident that a code means what it says, either.

Earle

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G

.

Wires were replaced a year ago. Reset the computer. Temps here are 80s to low 90s during the day. I live in northern Illinois. Nothing extreme.

Greg

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B

Thoroughly inspect all the vacuum lines connected to the intake manifold. Check for vacuum leaks in the TB base, or manifold to head gasket.

Bill Spiliotopoulos, '96 XJ, '06 TJ.

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G

Ok I get all that, but why does it run ok in the morning, and after work it won't get me home?

Greg

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B

Does this happen regularly or just happened the last time? Also, this might be related to the amount of fuel in the tank. If the fuel pump screen needs cleaning or is about to quit, it works with the tank full but when the fuel level drops bellow a threshold, it starts to cut out.

Regards,

Bill Spiliotopoulos.

Ok I get all that, but why does it run ok in the morning, and after work it won't get me home?

Greg

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G

Well turned out to be the fuel pump. Thanks everyone for your input. You all have been very helpful.

Greg

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K

Thanks for posting back with the solution! All too often, we never know :)

___oooo /l ,[____], l-L -OlllllllO- ()_)-()_)--)_)

My Hot Wheels Jeep:

2006 Rubicon, 4.0L, 5sp Auto, 4" Rough Country X series lift, RCX punkin guards, RCX adj. trak bar (POS), RC quick disconnects(not so quick), Selby Diamond Rock rails w/skids, Warn M8000, Carr Rota light bar with a six pack, Jeeperman rear bumper laying up in the shop waiting for modification, Dick Cepek 15x10 purty, shiney wheels (with some beauty marks on 'em), 33" Cepek Mud Country Tires, cheapo Cobra CB with a 4' Firestik and... hubby says more to come. NEXT, I want a SwayLoc!
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Well turned out to be the fuel pump. Thanks everyone for your input. You all have been very helpful.

Greg

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E

Well turned out to be the fuel pump. Thanks everyone for your input. You all have been very helpful.

Greg

--- --- --- --- Heh, that means mine will go soon. I have a '95 too. Thanks for the heads up.

Earle

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