Question about 1996 Jeep Grand Cherokee

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6cherokee after it gets hot and idles forbout4-5min idles ruff give it throttle wants to shut off but if you pump the gas baby it and get it going your ok till you stop !I unhooked vacuum hose to the lil canister in the font bumper an pulled a cap off A VACCUM PORT ON the intake maifold RUNS GREAT !PUT THAT STUFF BACK ON TOOK IT TOO AUTO ZONE ON THE CODE SAYS OXYGEN SENSOR IS LEAN GAS /AIR??? Comment posted on Jun 28, 2009 Thats what I've been leaning towards mine has two, but I'm thinking its the heated one (on the manifold)!but then i was thinking it's the IAC I'm stuck between the those two things but I BELIEVE IM GONE WITH THE OXYGEN SENSOR! THANK YOU! Comment posted on Jun 28, 2009 AS I SAID THE HOSES I TOOK OFF I PUT BACK ON BEFORE I CODE TESTED IT I HAVE NO VACCUM LEAKS ITS EITHER OXYGEN SENSOR OR IAC I DO BELIEVE! Comment posted on Jun 29, 2009

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  • 11 more comments 
  • jasonshaffer Jul 03, 2009

    I just replaced the oxygen sensor didnt improve it @all if any thing made it worse!

  • jasonshaffer Jul 03, 2009

    JUST PUT A OXYGEN SENSOR ON DID'NT MAKE A DIFFERENCE!IF ANYTHING MADE IT WORSE!

  • jasonshaffer Jul 03, 2009

    OK, I WILL DO THAT CHECK THE BACK ONE ALSO, AND TRY THE IAC THANK YOU!

  • jasonshaffer Jul 03, 2009

    WONT BE DOIN ANYMORE TILL TOMORROW!

  • jasonshaffer Jul 03, 2009

    IT HAS A BRAND NEW FUEL PUMP AND SCREEN! IT IS GETTING FUEL!

  • jasonshaffer Jul 04, 2009

    THE FAN IS WORKING AND THE RADIATOR GRILLFINS ARE FINE WERE TALKING ABOUT A EMISSION TYPE PROBLEM HERE NOT OVER HEATING WHEN I SAID THE MORE AIR IT GETS I WAS REFERING TO AIR INTO THE VACUUM LINE SUCKING AIR!NOT THROUGH THE RADIATOR THANKS ANYWAY
    AZUM

  • jasonshaffer Jul 04, 2009

    IT S NOT OVER HEATING AR YOU PEOPLE READING!????????????

  • jasonshaffer Jul 04, 2009

    PC MAIA ,WHAT THE HALL ARE YOU READING IF IT WAS OVER HEATIG I COULD HANDLE THAT! STICK WITH YOUR COMPUTERS ! WHERE IN THAT QUESTION DID IT SAY ITS OVER HEATING !


    PLEASE PEOPLE IF YOU CANT READ THEN PLEASE DON'T TRY TO HELP NEXT SOME ONE WILL TELL ME TO CHECK THE MUFFLER BEARING OR THE BATTERY FOR THE CHECK ENGINE LIGHT

  • jasonshaffer Jul 04, 2009

    nse joshua, have doe all you have named!

  • jasonshaffer Jul 04, 2009

    NSEJOSUA I KNOW @UNDERSTAND & AGREE I ALREADY CHECKED WHATYOU MENTIONED THATS WHERE I STARTED!

  • jasonshaffer Jul 05, 2009

    live tech , I did not say I changed the IAC. I SAID I HAVE A GOOD SENSE THATS WHAT IT IS! DO TO KEITHHEAVILI'S KNOWLEDGE &HELP &FROM WHAT I'VE READ & THOUGHT ABOUT THE WAY THINGS SEEM I PLAN ON CHANGING IT MONDAY

  • jasonshaffer Jul 06, 2009

    kieth heavili I DID EXACTLY WHAT YOU TOLD ME !THAT WAS THE PROBLEM I STILL HAVE TO GO PICK UP THE NEW IAC &PUT IT ON ,BUT I DID TAKE IT OFF AND CLEAN IT ,PUT IT BACK ON ,CURED THE PROBLEM 97%SO I'M GONNA GET THE NEW ONE AND IT SHOULD CURE THE PROBLEM!THANK YOU SO MUCH !
    thanks
    jasontshaffer

  • jasonshaffer Jul 06, 2009

    I DID EXACTLY WHAT YOU TOLD ME TO DO !CLEANED THE IAC PUT IT BACK ON RAN 97%BETTER SO NOW I CAN GO GET THE NEW ONE &PUT IT ON! THANK YOU SO MUCH ! I GREATLY APPRECIATE IT!I JUST WASN'T SURE WHERE TO START !MY DAD IS ARETIRED MECHANIC ON HEAVY EQUIPMENT !SO WHEN WE RUN INTO EMMISSION PROBLEMS WE GET SLOWED DOWN!PLS I HAVE A BROKEN LATERAL MALLELOUS AND @THE SAME TIME WE WERE REBUILDING A JD 410 BACKHOE SO WE HAD ALOT ON ARE PLATE!WELL I KNOW WHO TO TALK TO I HAVE A PROBLEM! THANKS AGAIN! & THANKS TO ALL @FIX YA

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15 Answers

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It has to be your oxygen sensor as if it was your IAC you wouldn't have to "baby" the gas to keep it from stalling out. Normally if it is the IAC as soon as you push the gas you are back in business. With that and the fact that the code came back as the oxygen sensor is lean I would definitely say that your manifold oxygen sensor is going bad. Change that one out, it's not too hard, and you will be back in business. Let me know if you have any other questions. Thanks for using FixYa!

Posted on Jul 03, 2009

  • Keith Heavilin
    Keith Heavilin Jul 03, 2009

    Ok, that is kinda strange. I assume that you bought your 02 sensor from Auto Zone and you can take it back and get the rear one to try it out. One question that I have is did you make sure that you received the correct o2 sensor from the store. You just have to make sure they gave you the manifold o2 sensor and not the rear one. If they did, like I said, take the one you purchased back. One thing that you can do to check and make sure it is not the IAC is you can take the IAC off and soak it in throttle body cleaner to see if you can clean it out some. If you do this, make sure you allow it to dry off and try to blow it off with some compressed air. If it seems to work better after you put it back in, then obviously the IAC is the problem. However, I have a hard time believing it's not one of your O2 sensors. Let me know what happens.



  • Keith Heavilin
    Keith Heavilin Jul 04, 2009

    I understand you are getting upset, but let's get back to some basics. Did you try to clean out the IAC? Did you check the O2 sensor they gave you at the store to make sure it was the right one? Have you tried replacing the other O2 sensor? Answer these questions for me and I will try to get you back on track here. Sorry for the frustration.

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  • 221 Answers

You have allready reached your repairs destination. It's definitely IAC as it's the main component a motor-driven valve which controls intake air to maintain idle RPM in the internal combustion engines. So you don't need to dig any deeper.

Best of luck

Gee

Posted on Jul 05, 2009

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The O2 lean code was either set by the vacuum hoses you had disconnected or it was there already stored in memory, this was in memory correct? another point, a defective O2 will never cause a rough run, EVER, intake leaks or a leaking EGR valve are the most common source of rough run at idle along with dirty fuel injectors, i assume you have ruled out any engine faults like burnt valves or low compression from anything else, spray the intake manifold gasket with Carb spray, it the engine smooths out u have a leaking intake man gasket, to check the EGR for leakage start the engine and let it idle, if the EGR is leaking the body of the EGR will get hot enough enough to burn your fingers in very short order, wet your fingers and touch iot, if it sizzles then it is sticking and leaking combustion gases into the engine at idle, this causes a real ratty idle.

Posted on Jul 05, 2009

  • yadayada
    yadayada Jul 05, 2009

    the info i gave u is correct, an O2 will not cause a rough idle, u are totally looking in the wrong place, did this 35 years do know this for sure..

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  • 67 Answers

Ok that is happening because of the engine you can get a new piece at a home depo or something that should help

Posted on Jul 05, 2009

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as per you mentioned that oxygen sensor and IAC both are replaced but still the problem is there.its advisable that you again check out the codes now ,as this this time both the possible doubts which the codes were indicating at autozone both are replaced.so now it will show the different code as which part is getting the problem.as per the problem which you mentioned it was oxygen sensor,and you replaced it .but still rechecking the codes again will help as the new codes will point out the faulty part. this will help.thanks.keep updated.

Posted on Jul 04, 2009

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Have you checked the EGR valve. I know when that recirc goes bad, it can cause rough idle, O2 codes and all kinds of problems. Good luck.

Posted on Jul 04, 2009

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It may be problem in oxy sensor...check out tat...else check up with fuel injector..

Posted on Jul 04, 2009

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If you don't have any error light on the dashboard the it will be complicated to solve this problem.You may end up changing lots of parts with no good result.I would suggest you use a diagnostic tool to check this.I have a feeling your catalytic converter might be blocked and to confirm that try to remove the sensor(if there is any) on the catalytic converter and glance inside it.If you see honey like things clogged to it then this is the fault.Normally if this is faulty to run fine for a few minutes until it warms up and prevent air from going out freely.Another way to check this is to feel the exhaust pipe when the engine warms up and compare it to another same vehicle.If you noticed yours is nearly burning your hands then this is the fault.Check on google for digimotilite which is a free software to diagnose vehicle as long as you have the necessary cable to plug into your vehicle.Hope this helps and remember, DO NOT CHANGE PARTS without being sure as these are quite complicated systems and a simple fault could cause all this.

Posted on Jul 04, 2009

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Hi!... Please Inspect the Following...
Fuel pressure regulator or the Fuel pump
Intake Manifold
Vacuum manifold for leaks
Throttle Body
EGR Valve
If problem still the sam check and clean the Spark plugs, inspect the plug lines or it might be weak ignition coil...
Hope I helped...

Posted on Jul 04, 2009

  • Joshua Escasinas
    Joshua Escasinas Jul 04, 2009

    these are the possible culprits of your problem. each items i've mentioned are relative to each other... i've done these a lot on cars with the problem like you have, there's no harm in trying but finding the the solution is winning and learning!...

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Hi...

Check water pump

The 4.0 has two cooling fans, 1 belt driven and one electric. If you determine the water pump is circulating the coolant and it is still overheating, observe the electric cooling fan for operation. It can be activated by turning on the A/C and also will come on when the temperature of the coolant reaches its setting. If the electric fan is not coming on when the engine gets warm you are only cooling 1/2 of the surface area of the radiator. Unplug the fan and run wires from your battery to the fan and check if it comes on. If it does not, then you need a new electric fan. If the fan comes on with direct wiring from the battery, check the fan relay switch located under the hood, it could be bad.

All of this is assuming you are not losing coolant from any source including the headgasket.

Good luck !!!

Regards

PCmania


Posted on Jul 04, 2009

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You were on the right track with the IAC !!

Give it a whirl.

Thanks for using FixYa!!

Posted on Jul 04, 2009

  • blueextc3221
    blueextc3221 Jul 04, 2009

    will you pleas post the exact OBD code you pulled at autozone?
    the numbers have different meanings/submeanings on different vehicles.

    Thanks



  • blueextc3221
    blueextc3221 Jul 04, 2009

    If I had to venture a guess at the code you are getting it is 51??
    (Key on-off-on-off-on)

    Replacing the O2 sensor because of a error 51 is akin to killing the messenger because of the message. It was probably good. The sensor is reporting a condition and has done all it can do to correct it. The problem is bigger than it can handle.

    A lean condition can be, and is most often, caused by a vacuum leak. So I would
    check all the vacuum lines and the air intake hose for cracks, breaks and
    connection.



    Also the intake manifold gasket could be bad, not very
    common on this engine but not out of the realm of possibility.



    Squirting a
    little carburetor cleaner around the intake and seeing if there is a rise in rpm
    will help confirm a bad intake manifold gasket.



    Other causes of a lean condition is low fuel pressure,
    dirty fuel injectors or an injector not working.

    And you have 2 O2 sensors (one upstream and one downstream).


    The engine is probaby blowing black exhaust
    in open-loop mode (cold engine), and the O2 sensor is only recognized by the ECM
    in closed-loop mode (once the engine is up to operating temp).



    Replace the
    MAP sensor with brand new one before your new O2 sensors go bad too.

    Thanks for using FixYa - If you felt this comment was helpful - please accept.

    Thankyou :D


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  • 353 Answers

Check and clean the maf sensor
make sure egr is moving freely
check the fuel pressure
iv'e also seen the 2" long rubber hose in the fuel tank split

Posted on Jul 03, 2009

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Hello if it is a po171 code this is a lean condition not a o2 sensor that code would be po135 and po137.What you have going on most likely is the fuel pump getting weak ,and when it does po171 code will show.The iac will not cause this problem it will work or die thats it.The fuel pump is a electric motor ,when it gets hot if it is on its last leggs then the fuel pressure will drop giving you a lean condition ,.If this is a v8 engine like 5.2 liter then the intake manifold is leaking this was a big problem with this engine. That you will not be able to see until you take the intake off .Still would like to know what the code # is.

Posted on Jul 03, 2009

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Whatever hose you pulled off has a fualty component. So the device the hose is attached to is faulty. You can view a free online repair manual at autozone.com

Posted on Jul 03, 2009

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It seems to me that your Radiaor's fan is not working have you checked it .. there is a possiblity that there is two much dust in the radiator grilfines

Posted on Jul 03, 2009

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