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  #1  
Old 03-11-2015, 03:33 PM
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idle issue

When I first drive it it runs good and after a while whenit get good and hot the rpms go up and down,and jerks and misfire and then shut off,but if I accelerate it smooths out til I let off the accelerators ,could this be a o2 sensor problem or idle air control valve?

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  #2  
Old 03-11-2015, 04:15 PM
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Re: idle issue

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Originally Posted by Mr Cox View Post
When I first drive it it runs good and after a while whenit get good and hot the rpms go up and down,and jerks and misfire and then shut off,but if I accelerate it smooths out til I let off the accelerators ,could this be a o2 sensor problem or idle air control valve?
It would be good to provide the year, make, model, engine, and roughly how many miles and any mods you might have made.

You can put your vehicle details in your profile info so you don't have to provide them every time.
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Old 03-11-2015, 04:32 PM
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2001 Jeep grand Cherokee limit 4.7 v8
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Old 03-11-2015, 07:54 PM
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Re: idle issue

Did you check for any fault code stored in the PCM? If you donīt have a scanner, you can do the keydance: ignition switch off/run three times and leave in run at the third time. odometer will show DONE when no faults stored, or a fault code(s).
Irregular idle can be caused by a dirty IAC stepper motor plunjer or air canal, but many times as well due to a bad TPS. I would first remove the IAC stepper motor and clean it very well (donīt turn the plunjer head, or you will break it). You can also spray some carburator cleaner through the idle air canal, after removing the resonator box.
If this doesnīt help, you need a scanner which shows live data, to see if the TPS is steady, or fluctuating as well. At idle its around 11-12 %, but it should be steady. If it fluctuates, then the TPS is bad.
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Old 03-12-2015, 01:07 PM
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Well I put in a new today,but I took the iac out and cleaned but I did turn it so now I know to change it now,but my o2 sensor connector got full of oil, would make the sensor stop working as Well?
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Old 03-12-2015, 01:08 PM
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I meant to say tps
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Old 03-12-2015, 01:59 PM
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Re: idle issue

The O2 sensor connectors are sealed against moisture, but is there oil inside the connector? If so, i would clean it out with electrical contact cleaner. The O2 sensor output is not used when the engine is cold (or in fact when the sensor is properly heated), so the oil in the connector can have something to do with your problem, eventhough a bad O2 should not cause a fluctuating rpm.
Did you really turn the IAC plunjer? If so, you will break some internal plastic prones which should prevent it from rotating. When the plunjer rotates, then it will not change the idle air canal opening and the idle control is lost.
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Old 03-12-2015, 02:23 PM
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Yeah I really did turn it but thank to you I know to buy one and the o2 sensor,thank for the info,now I can stop beat my head on the wall...lol,thanks a ton!!!
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Old 03-16-2015, 11:46 AM
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Well in my 2001 Jeep grand Cherokee 4.7 v8 I put in a new IAC, TPS, EVAP and it still idling up and down!
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Old 03-16-2015, 01:30 PM
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Re: idle issue

The P0051 code you have has to do with the bank 2 sensor 1 ( so rh bank as seen from drivers seat, the upstream sensor (from the cat).
Was this the sensor which had the oil in the connector? Did you clean it well?
Also check the fuse for the 2-1 O2 sensor, which sits in the PDC under the hood.
Also check the wires going from the sensor if they are not chaving against some metal part or have the isolation melted by a hot exhaust part.
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Old 03-16-2015, 01:57 PM
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Yes it was that sensor that had oil in it do to a valve cover gasket leak,and it leaked oil in it for a while!
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Old 03-16-2015, 02:32 PM
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Re: idle issue

Did you check the O2 fuse? Did you check the O2 sensor wiring? Do you have a scanner which shows live data? If so, then you can check the O2 sensor voltage.
If you would decide to change the O2 sensor, then best is to go with OEM (Denso). I bought mine a few months ago for about USD 30 online.
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