idle throb 500-750
11-24-2009, 06:14 PM
#2
CF Veteran
How is your fuel pressure?
Have you changed any sensors/done any work lately?
Does it seem to be running rich?
Are your injectors leaking?
Any holes in vaccum hoses?
Is your CEL on?
Just a few things to check...
Have you changed any sensors/done any work lately?
Does it seem to be running rich?
Are your injectors leaking?
Any holes in vaccum hoses?
Is your CEL on?
Just a few things to check...
11-24-2009, 06:24 PM
#4
CF Veteran
Im not positive, but I think a bad MAP sensor or o2 sensor could cause idle lope too.
I would also clean your TB/IAC just for the hell of it, to see if it helps.
Pull a plug and see what it looks like if you havent changed them since youve got it. They should have a brown/grayish tan color.
You have a 2001, wasnt that the year with the 0331 heads? I would check for oil in the coolant/coolant in the oil.
Just throwing ideas out there, If I think of anything else I will post it.
I would also clean your TB/IAC just for the hell of it, to see if it helps.
Pull a plug and see what it looks like if you havent changed them since youve got it. They should have a brown/grayish tan color.
You have a 2001, wasnt that the year with the 0331 heads? I would check for oil in the coolant/coolant in the oil.
Just throwing ideas out there, If I think of anything else I will post it.
11-24-2009, 08:45 PM
#7
CF Veteran
MAP: Manifold Absolute Pressure. On my 89 it is located on the firewall, drivers side. With a vaccum line running from it to the TB.
Im assuming you know what an Oxygen Sensor is.
TB: Throttle Body
IAC: Idle Air Control, located on the Throttle Body
Im assuming you know what a spark plug is
0331 heads are known to crack, they where used somewhere around 2000, but im not sure what year exactly.
Im assuming you can take out the dipstick and check the oil for water droplets, same with checking the coolant.
Im assuming you know what an Oxygen Sensor is.
TB: Throttle Body
IAC: Idle Air Control, located on the Throttle Body
Im assuming you know what a spark plug is
0331 heads are known to crack, they where used somewhere around 2000, but im not sure what year exactly.
Im assuming you can take out the dipstick and check the oil for water droplets, same with checking the coolant.
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11-24-2009, 09:04 PM
#9
Caracticus Potts The Mod
11-24-2009, 09:15 PM
#11
CF Veteran
removing your iac and cleaning it is free!
all you have to do is unclip the wiring harness, remove 2 torx screws, and take out the iac.
Clean the iac, maybe with a toothbrush and some sensor safe spray cleaner.
Put your Iac back in, and see if it helped..
all you have to do is unclip the wiring harness, remove 2 torx screws, and take out the iac.
Clean the iac, maybe with a toothbrush and some sensor safe spray cleaner.
Put your Iac back in, and see if it helped..
11-24-2009, 09:16 PM
#13
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Year: 2001
Model: Cherokee
Engine: 4.0L
does it only happen when you have your defrost/AC on?
it is normal and it caught my attention the first time it happened. i only mention this because it throbs at the exact RPM you described.
11-28-2009, 04:12 PM
#15
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Year: 2001
Model: Cherokee
Engine: 4.0l
well, i took off my iac and it looks spic and span.
the only thing questionable is when i move the hicky back, i can see some white stuff...
do yall know if thats my prob or is the white stuff supposed to be there??
the only thing questionable is when i move the hicky back, i can see some white stuff...
do yall know if thats my prob or is the white stuff supposed to be there??