Question about 1993 Jeep Cherokee Country

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High idle 1993 JEEP CHEROKEE 4WD 6 Cylinders 242 S 4.0L MFI replaced Exhaust Manifold and o2 sensor in park and neutral idles @ 1500rpm and runs in drive @1000rpm what next

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First look for vacuum leaks around the manifold you could have easily misseated the intake or cracked it if you improperly tightened it

Posted on Oct 07, 2009

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Posted on Jan 02, 2017

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1 Answer

What controls the fuel mixture when engine is idling?


It could be a number of things, if it's injected then it could be fuel rail pressure sensor, or it could be air flow sensor or it could be O2 sensor, have a mechanic diagnose it

Aug 30, 2014 | 1999 Jeep Cherokee 4WD

2 Answers

I have a 1993 Ford Explorer that goes into high idle when I put in gear. It does this when the engine is hot or cold.


On some cars there's a speed sensor on the clutch or transmission. That might cause an idle problem.

Mar 24, 2014 | 1993 Ford Explorer Limited

1 Answer

Hi, I Purchased a 2001 Jeep Grand Cherokee LTD with a 4.7L engine. Please keep in mind. I had the jeep fully inspected, when i purchased it. At the time it passed with flying colors. I have taken the...


check the O2 sensors in the exhaust manifold with a automotive meter not a code reader ,then trade it in for a diesel manual version as these are impressive but 4.7 litre gas guzler at our petrol prices about 10 dollars a gallon in the -uk and around 7/8 dollars here in spain this vehicle you couldnt give away here

Mar 04, 2011 | 2001 Jeep Grand Cherokee

1 Answer

How many oxygen sensors does a 1997 pontiac grand am have and how would i know which one needs to be replaced,the car is idling high. I also need to replace the exhaust manifold gasketand i was asked was...


Your vehicle will have 2 O2 sensors. One before the catalytic converter and one after. replacing the O2 sensor will likely not solve your high idle issue. An O2 sensor that has gone bad will likely set a code and turn on the check engine light. Is the check engine light on?

I assume you have a 3.1 liter V-6?

The left exhaust manifold will be the one closest to the radiator. The righ will be the one closest to the firewall.

Jan 28, 2011 | 1997 Pontiac Grand Am

1 Answer

How many temperature sensor are there on 5.2 liter


Also I have one 1993 Jeep Grand Cherokee 4WD 5.2L MFI 8cyl (nice SUV) this vehicle is not equipped with Engine Temperature Sensor; just have this...
- The Coolant Temperature Sensor is located: Under hood, center, upper engine area, mounted in driver side of water outlet
- The Temperature Switch is located: Under hood, center, upper engine area, passenger side of water outlet, mounted in intake manifold

Hope this helps (remember to rate this answer) and, if you need additional details or repair manualm juts send us a new message.

Dec 19, 2010 | 1993 Jeep Grand Cherokee

1 Answer

93 jeep grand cherokee. Starts and idles ok.


Being injected, the control system varies fuel quantity and does not directly regulate air flow. Therefore, having black soot on plugs tells you that there is too much fuel going into the engine. The O2 sensor tends to react to, more than control that. Missing can be the result of plug fouling. Backfire may be the result of a too rich fuel mix permitting unburned fuel to enter the hot exhaust where it re-ignites.
Where I would look first in your case is to the manifold air temp sending unit and the coolant temp sender as well. If either or both are out of range the computer may "think" it is running a cold engine and therefore adding additional fuel for cold start up,and not switching to normal run mode when the engine reaches operating temp. Once the plugs foul the engine will continue to run poorly regardless of other conditions. You can test each component individually using either chilton or haynes manual as a guide. You will need a decent digital multi-meter to do the tests.
You can also have a code test done at most major parts stores, but often if sensors are not bad enough to set a code but together are causing a problem, you may not see anything except the O2 sensor.
There are other possible causes such as worn out injectors, but most often that won't happen in all cylinders at the same time. Do testing first, correct whatever you find and then make sure plugs are clean. If after running, the O2 sensor continues to register a fault, then replace it.
Good luck...any further questions are welcome and don't forget to rate answers!!!

Feb 22, 2010 | 1993 Jeep Grand Cherokee

2 Answers

2002 jeep grand cherokee 4.0 liter irregular idle. When I start my jeep it idles high and low and revs up and down and then the idle finally settles. After it settles, the engine kind of hiccups and a...


You haven't changed everything...map sensor controls spark and fuel mixture as does the throttle position sensor, also check the idle control valve...Don't just buy stuff...do testing first.

Sep 06, 2009 | 2002 Jeep Grand Cherokee

1 Answer

1998 jeep cherokee can smell exhaust when idled


check the exhaust manifold.It is prone to cracking at the expansion joints.Causing you to smell exhaust and confusing the upstream o2 sensor

Aug 02, 2009 | 1998 Jeep Cherokee

1 Answer

97 Jeep grand cherokee 6 cyl. idles down to 0 and dies.


any leaks in intake or exhaust upstream of the sensors, sparkplug condition and engine controls/sensors for out of range operation (including fuel pressure and condition of regulator)
IAC should be cleaned and checked as this can cause poor idle and shut down. I'm not saying not to change O2 sensors, but unless everything else if OK, it probably won't help.

May 29, 2009 | 1997 Jeep Grand Cherokee

2 Answers

Running rich. No power. 5.2 v8


it can cause it to run rich because the oxygen sensor may be getting a false reading as to how much oxygen is there....this in turn causes the pcm to add more fuel

Dec 02, 2008 | 1993 Jeep Grand Cherokee

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