93xj running to rich and bad gas milage
#1
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Year: 1993
Model: Cherokee
Engine: 4.0L
93xj running to rich and bad gas milage
So i just did a complete tune-up on my cherokee. New plugs, wires, cap/rotor, fuel filter, o2 sensor, map sensor, fuel pressure regulator, seafoam, also cleaned throttle body and iac sensor.
Now it still idles bad(sounds like its spitting), get about 11.5mpg, and also exhuast smells like gas.
HELP PLEASE.
Now it still idles bad(sounds like its spitting), get about 11.5mpg, and also exhuast smells like gas.
HELP PLEASE.
#3
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Year: 1993
Model: Cherokee
Engine: 4.0L I6 MPI "Power Tech HO"
Hmmmmmm. . . .
cylinder compression? Just wondering, that happened to my friend's dodge. He had to put in new piston rings. If some of the gass smell goes away when the engine is hot then it could be the rings are too worn and they are just making a better seal when they expand when it is hot. just a tentative thought though.
injectors?
injectors?
Last edited by 4x4tirechirp; 03-08-2009 at 01:48 AM.
#6
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Year: 94 XJ
Model: Cherokee
Engine: 4.0L
Change air cleaner and then clean your IAT sensor.
Use this for reference:
https://www.cherokeeforum.com/f51/budget-airbox-mod-iat-relocation-2599/
Have you changed your thermostat?
Is it a 190* or have you made the same mistake as others and switched to a 180*?
Use this for reference:
https://www.cherokeeforum.com/f51/budget-airbox-mod-iat-relocation-2599/
Have you changed your thermostat?
Is it a 190* or have you made the same mistake as others and switched to a 180*?
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#9
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Year: 1993
Model: Cherokee
Engine: 4.0L I6 MPI "Power Tech HO"
try these things
intake air temp. sensor= check; Upstream O2 sensor replacement (this is most likely only the cause if it runs at a higher rpm for the first 2-5 minutes of idle); very unlikely but try testing the idle control motor or the idle control valve---one last thing the manifold absoulut pressure sensor or the MAP sensor. you could try to see if the problem abates if you reboot the ECU by disconecting the battery too. (however i really don't like this meathod of "fixing" problems 'cause it erases the error codes that have been stored)
just a few thoughts again.
just a few thoughts again.
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