All jeeps use a MAP sensor
"speed density system" ways and means.
and all race with air leaks, (aka. vacuum leaks) with full power.
did you scan the PCM first?. that be first in every case.
if not , you work totally blind. (must we?)
no engine stated. (size and fuel matters)
making accurate answers impossible.!
2004 Cherokee, not here, not in USA< on this USA forum.
my guess its really a
"KJ / Since 2002 The Liberty (called Cherokee outside USA, very odd that)"
so to USA readers its a Liberty. for sure.
in what country ive not a clue, nor what engine options
they use THERE.
i have the 2002,and 05 KJ FSM book.
i see the exports have diesels. got diesel?
our KJ have 2.4L or 3.7L engines.
both race , with vacuum leaks.
one leak that can happen (not guessing)
1: throttle plate gunked up and now leaks air, because the throttle can not close fully.
2: ISC stuck open. (idle speed control valve)
3: vacuum hoses cracked, or just fell off.?
and 50 more ways to leak air, huge.. .in the real world.
we pinch hoses and use propane gas to find leaks
or the smoke machine.
SOURCE: 2004 jeep grand cherokee idling problem
check your throttle position sensor and idle air control solenoid.
SOURCE: 2004 jeep grand cherokee idling problem. Revs motor 200 to 500 rpms higher while driving.
I had the exact same problem on my 04 GC. I put some Techron Concentrate Plus Fuel System Cleaner in from Wal-Mart and it seemed to fix the problems right away. Let me know.
SOURCE: 1999 Jeep grand cherokee limited - irregular idle
I don 't know if I can solve it, but I had a very similar problem on a 2002 Grd Cherokee Laredo. It ended up being the Throttle Positioning Sensor (TPS). Unfortunately the part alone is about $125 and and total installed cost was about $250. It would idle high at first, then gradually work it self down to a normal idle. Once it was warmed up it it would have an up and down RPM during idling, and several times it stalled out at intersections. There was also a lot of transmission clunking going on when you put it in reverse or drive.
Runs like a dream now. Clunking is gone and idle speed is just right.
SOURCE: 2004 Jeep Grand Cherokee. Keeps stalling, engine
P0505 means the whole Idle Control system, not only the IAM. Check all related sensors (i.e. crankshaft sensor). Check with a voltmeter direct at the connector of the IAM if you get any signal. Remove the IAM from the TB, connect him, let someone switch your ignition key to ON. The IAM need to drive in/out for a short time to find the right position. Hold the IAM near a hard part, that they cant drive out completely! If IAM works fine, check the fuel pressure, check and clean your TB ( if not done yet). If that doesn't work, come back again please
SOURCE: 2004 Jeep Grand Cherokee The
You may have a faulty sensor, most cases a wheel speed sensor, the light is on warning you that you do not have abs basically your car will stop like an old 70's model car before abs. abs atands for anti lock brakes, it keeps your brakes from locking up under extreme braking.
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