Question about 1994 Jeep Grand Cherokee

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Why does a 94 v-8 limited vehicle have acceleration surges.this happens with acceleration or with brake applied just after using accelerator.this does not happen at idle or in neutral. why does this h

Why does a 94 v-8 limited vehicle have acceleration surges.this happens with acceleration or with brake applied just after using accelerator.this does not happen at idle or in neutral. why does this happen?

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  • Jeep Master
  • 14,585 Answers

Surges are usually from dirty throttle body's, idle air control motors, or airfilters. I would clean or replace these first. Other things could be O2 sensors, or bad catalytic converters.

Posted on Nov 30, 2014

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6ya6ya
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Posted on Jan 02, 2017

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husni_g2002
  • 112 Answers

SOURCE: thumping noise at 60-65 mph

check wheel balance.

Posted on Jan 21, 2009

  • 34 Answers

SOURCE: The car won't stay on without giving it gas

Jeep Cherokee Limited Crank, No Start
Q. Hi! The Jeep has periods when it will not start for a couple days (cranks fine but won't fire), then it will mysteriously start again. A friend suggested that it may be the CPS - I checked it has 200 oM - when I'm cranking by hand it's little bit changing - it should be OK. But again, wouldn't this also effect the engine during those times that it was running?
mechanic.jpg This problem occurs during rainy and sunny weather so I don't think it's a moisture or water intrusion problem. Is there any part of the ignition system that only affects starting that could be causing this problem?

  • 1989 Jeep Cherokee Limited
  • 4.0 liter
  • Automatic transmission
  • 170,000 miles
I found some forum where some guy had the same:
"I am having the same or similar problem with my wifes 1990 Cherokee. I have found a place that tests the ICM. It may take a while to find a place in your area. I suggest you go in person and talk to the people in your better parts stores.
I have been unsuccessful so far in finding the fault. My ICM has been tested twice and passed both times. I have power to the ICM and the coil checks within parameters. This has been a very frustrating problem for me. I'm about ready to drive it off a cliff and call it a day. Good luck."

So my question is; what is the reason of that? Thanks for help...
Pawel
A. This was a widespread problem for Chrysler and they issued a couple of TSBs to address the problem. The first was:
Models:
1989 MJ & XJ Bodies
Subject:
4.0L No-Start, Hard Restart, or Engine Die-Out. Vehicles Equipped With Automatic Transmission Only.
Index:
DRIVEABILITY
Date: December 29, 1989 No.: 18-57-89 (C18-23-9) P-14 Body Code Legend:
MJ - COMANCHE (RWD, 4WD) XJ - CHEROKEE/WAGONEER (RWD, 4WD)
SYMPTOM/CONDITION:
Some 1989 vehicles equipped with the 4.0L engine and automatic transmission may experience an engine no-start, hard restart, or an engine die-out. This condition may be caused by low signal strength from the crank position sensor due to a larger than desired distance to the flywheel sensing ring.
DIAGNOSIS:
42257289.gif Check to see if the vehicle has a slotted crank position sensor:
  1. If the vehicle is equipped with a slotted crank position sensor (see Figure 1), check to see if the CPS grommet on the top of the transmission bell housing has been updated (see Figure 2). If the CPS grommet has not been updated, replace the CPS grommet per the Repair Procedure outlined below.
If the vehicle has a slotted crank position sensor and new CPS grommet, do not install a new sensor, but reinstall the slotted sensor that was on the vehicle and verify that it is good using procedures in the 1989 Jeep Service Manual 81-370-9045 on page 14-87.
  1. If the vehicle does not have a slotted crank position sensor already installed, then proceed with the Repair Procedure.
PARTS REQUIRED:
1 Crank Position Sensor (slotted) P/N 83100067 1 Crank Position Sensor Grommet P/N 83100068 REPAIR PROCEDURE:
  1. Turn the ignition switch to the "OFF" position.
  2. Disconnect the Crank Position Sensor (CPS) from the engine harness.
  3. Raise the vehicle using a lift.
  4. Remove the old CPS and grommet.
  5. Install the new CPS grommet.
NOTE: THE NEW CPS GROMMET MUST BE REPLACED SO THAT THE MAXIMUM SIGNAL OUTPUT CAN BE OBTAINED FROM THE NEW CRANK POSITION SENSOR.
  1. Install the new Crank Position Sensor and loosely attach the retaining bolts.
  2. Firmly press down on the slotted hole side of the CPS until it bottoms on the machined lip of the bellhousing. While holding the CPS down against the bellhousing, tighten the bolt on the slotted side of the CPS to 16 ft.lbs.
  3. Tighten the remaining attaching bolt to 16 ft.lbs.
NOTE: MAKE CERTAIN THAT THE CRANK POSITION SENSOR IS COMPLETELY BOTTOMED ON THE MACHINED LIP OF THE BELLHOUSING AND IS AS CLOSE AS POSSIBLE TO THE FLYWHEEL SENSING RING WITHOUT CONTACTING IT.
  1. Secure the lead of the CPS to the retaining clip on the bellhousing to prevent its contact with the exhaust manifold.
  2. Lower the vehicle.
  3. Connect the CPS to the engine harness.
If this repair has been made, or hasn't fixed the problem, the other TSB is 18-54-89 REVISION A recommending cleaning of the throttle body assembly, DIY: Cleaning Throttle Bodies, and replacement of the PCM.
PARTS REQUIRED:
1 ECU (Automatic Transmission) P/N 53007842 1 ECU (Manual Transmission) P/N 53007843 1 Mopar Choke and Linkage Cleaner P/N 4549619

Posted on Dec 03, 2009

  • 169 Answers

SOURCE: Whining from rear of vehicle only when accelerator

Check the rear differential fluid level and or condition of the fluid. if it is low you could have a bad pinion or carrier bearings (common in jeeps) you may need to remove the cover all together and all the fluid will drain out. you should be prepaired to catch the fluid in a pan and also have gasket sealer to reinstall the cover. Usually you can just remove the rubber plug on the cover and the fluid should be just at the edge of the bottom of the hole when the vehicle is on level ground. if there is no rubber plug on the cover then there is a fill plug on the passenger side of the differential just above and a little further back from where the pinion goes into the rear axle housing. if there is any signs of metal or a silverish color then you are getting failure of some sort in the differential (axle)- usually bearings. the pinion bearing is usually the first to fail because of the speed it spins at and the fact that the force used to spin the carrier wich turns the axles is taken off the side of the pinion gear. if the oil is clean and full but smells prety bad.. -this is normal. removing the cover can be a project so if you are intimidated by the sounds of it then take it to a professional and save yourself a towing charge. i would rate the difficulty at about a 3 out of 10. make sure you use the proper fluid to refill it also. good luck. let me know if you want more help from me.

Posted on Dec 30, 2009

  • 1 Answer

SOURCE: When first driving, I hear a high pitched

I have the exact same problem, however reversed. My whistling sound stops when I accelerate and starts when my foot is off the accelerator. Frustrates me and am afraid to have it looked at for fear of the cost of fixing this problem. Have you since discovered what the problem is or was?

Posted on Feb 03, 2010

  • 14585 Answers

SOURCE: 1996 Jeep Grand Cherokee Laredo

I would start with replacing the airfilter(if dirty) and fuel filter.especially the the fuel they clog up and give you sufficient pressure but no flow

Posted on Nov 27, 2010

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Car loses power while acceleration? http://schematicsdiagram.blogspot.com/2011/12/car-loses-power-while-acceleration.html

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http://technoanswers.blogspot.in/2012/02/loss-of-acceleration.html

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http://repairhelpcenter.blogspot.com/2012/01/acceleration-lag-problem.html

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How exactly the Vehicles Accelerator Cable works?

http://repairhelpcenter.blogspot.com/2011/11/how-exactly-vehicles-accelerator-cable.html

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How exactly Vehicles Accelerator Pump Diaphragm Works?

http://repairhelpcenter.blogspot.com/2011/11/how-exactly-vehicles-accelerator-pump.html

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accelerator pedal sensor?

http://technoanswers.blogspot.in/2012/02/2009-chevy-impala-accelerator-pedal.html

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http://technoanswers.blogspot.in/2012/02/nissan-pathfinder-stalls-and-bucks-on.html

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For acceleration problem,the help links are provided below,click the link below to go through its procedure :----Engine accelerates when brake is applied? http://technoanswers.blogspot.in/2012/02/engine-accelerates-when-brake-is.html ----------
Loss of acceleration? http://technoanswers.blogspot.in/2012/02/loss-of-acceleration.html
----------How exactly the Vehicles Accelerator Cable works?

http://repairhelpcenter.blogspot.com/2011/11/how-exactly-vehicles-accelerator-cable.html

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How exactly Vehicles Accelerator Pump Diaphragm Works?

http://repairhelpcenter.blogspot.com/2011/11/how-exactly-vehicles-accelerator-pump.html

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accelerator pedal sensor? http://technoanswers.blogspot.in/2012/02/2009-chevy-impala-accelerator-pedal.html

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stalls and bucks on Acceleration? http://technoanswers.blogspot.in/2012/02/nissan-pathfinder-stalls-and-bucks-on.html

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Acceleration lag problem? http://repairhelpcenter.blogspot.com/2012/01/acceleration-lag-problem.html

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Loss of acceleration?

http://technoanswers.blogspot.in/2012/02/loss-of-acceleration.html

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http://repairhelpcenter.blogspot.com/2012/01/acceleration-lag-problem.html

--------------
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http://repairhelpcenter.blogspot.com/2011/11/how-exactly-vehicles-accelerator-cable.html

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http://repairhelpcenter.blogspot.com/2011/11/how-exactly-vehicles-accelerator-pump.html

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accelerator pedal sensor?

http://technoanswers.blogspot.in/2012/02/2009-chevy-impala-accelerator-pedal.html

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http://technoanswers.blogspot.in/2012/02/nissan-pathfinder-stalls-and-bucks-on.html

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http://technoanswers.blogspot.in/2012/02/engine-accelerates-when-brake-is.html

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http://technoanswers.blogspot.in/2012/02/loss-of-acceleration.html

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http://repairhelpcenter.blogspot.com/2011/11/how-exactly-vehicles-accelerator-cable.html

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http://repairhelpcenter.blogspot.com/2011/11/how-exactly-vehicles-accelerator-pump.html

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http://technoanswers.blogspot.in/2012/02/2009-chevy-impala-accelerator-pedal.html

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http://technoanswers.blogspot.in/2012/02/nissan-pathfinder-stalls-and-bucks-on.html

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http://repairhelpcenter.blogspot.com/2012/01/acceleration-lag-problem.html

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http://schematicsdiagram.blogspot.com/2011/12/car-loses-power-while-acceleration.html

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Hope helps.

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