Unknown problem idle problem - JeepForum.com

 
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post #1 of 7 Old 12-21-2007, 03:20 PM Thread Starter
drunkenmonke
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Unknown problem idle problem

My 4.0 starts up fine and then goes into a rough idle. I have cleaned the original TPS sensor and swapped it with another used one. The other thing that is connected to the throttle body i have also swapped with another used one(the one where the little square fits into the grooved plastic Im assuming its hooked to the butterfly). I could not find a map sensor to swap out but tried cleaning inside that, could that be the problem? I go thorugh ridiculous amounts of gas when the check engine light finally does come on, but then i just pull the negative battery cable, reset the computer and it runs with no engine light for a while. Everything got submerged in water. I have checked connections and cleaned them out and vacuum lines. A computer hooked up to it said Fuel system lean at bank 1, and the turn key method I believe came up with a 25 code. Please give me all possible ideas because I am running out of them and gettin ready to get rid of this thing if I can't trouble shoot it, I've spent weeks!

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post #2 of 7 Old 12-21-2007, 08:50 PM
project78
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check your temp control sensor,let me know if it'
s it. I had a 5.2 THAT DROVE ME NUTS. every 7 minutes black smoke billow out of exaust.Had to pull over pull the neg cable .again again again.........
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post #3 of 7 Old 12-21-2007, 08:54 PM
lifted92xj
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also on the firewall to the right of the valve cover theres a little black computer sensor(brain freeze cant think of what its called) but has ony 1 plug going in..make sure thats connected and tight..i had that problem before and that fixed it..if i find a pic of an enine bay ill mark it out for you

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post #4 of 7 Old 12-21-2007, 08:57 PM
lifted92xj
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not my engine but this is what i was talking about

big lift, sick tires, awsome accessories, alot of custom work.

my jeep won the war, your honda mows my lawn
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post #5 of 7 Old 12-22-2007, 08:09 AM
AZ Jeff
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Quote:
Originally Posted by lifted92xj
not my engine but this is what i was talking about
That's the MAP (Manifold Absolute Pressure) SENSOR. It senses intake manifold vacuum, and the ECU uses that, along with other inputs, to calculate F/A ratio, and adjust fuel injector pulse duration.

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post #6 of 7 Old 12-22-2007, 10:54 AM Thread Starter
drunkenmonke
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Thanks, my map is on the throttle body and i cant seem to find a used one or that would have been changed already. I will also try the temp control.
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post #7 of 7 Old 12-22-2007, 10:56 AM
lifted92xj
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Quote:
Originally Posted by AZ Jeff
That's the MAP (Manifold Absolute Pressure) SENSOR. It senses intake manifold vacuum, and the ECU uses that, along with other inputs, to calculate F/A ratio, and adjust fuel injector pulse duration.
thats better than litte black computer thingy..thanks

big lift, sick tires, awsome accessories, alot of custom work.

my jeep won the war, your honda mows my lawn
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