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Jeep engine repair questions and answers

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  • AMCollinsworth
    AMCollinsworth - 1996 Jeep Grand Cherokee - Engine - 10/19/2014
    Is this problem electrical? If so, can anyone pinpoint what is wrong?
    This started a few days back. I had my car in a McDonalds drive thru, then I noticed the *ding* meaning to look at the dash lights, I see "Check Gauges". I look over and immediately notice the battery gauge fluctuate from the middle (14) halfway almost down to the ...
     
    • Jimm
      10/18/2014 Jimm
      Several possibilities; faulty alternator, loose/worn serpentine drive belt, worn drive belt tensioner, wiring / connection corroded or loose - especially the negative ground connection opposite the battery.

      Have the charging system tested for free - at any local auto parts store.
      Jimm
      10/18/2014 AMCollinsworth
      So, you don't believe it to have anything to do with the fuel pump?
    • Jimm
      10/19/2014 Jimm
      Given the symptoms and details you have provided so far - I'd start with the charging system, especially the battery cables.

      Since the fuel system and fuel pressure was not mentioned nor tested just yet - have no reason to suspect the fuel pump. At least, not without more information, such as test results.
      Jimm
      10/19/2014 AMCollinsworth
      Well, I have returned to get the system tested and everything passed. The associate did notice that the positive terminal on the battery was corroded, and the negative terminal is cracked. Could this be the answer given the circumstances and symptoms? Me needing new terminals.
      Jimm
      10/19/2014 AMCollinsworth
      Also, how would I give the fuel pump a test? Just to use the process of elimination.
    • Jimm
      10/19/2014 Jimm
      Replace the cracked terminal and clean the corroded battery terminal(s) as the next steps. Rule out the fuel pump / fuel system until the electrical system; battery,alternator, drive belt, wiring and terminals are in good shape / good working order.
    • alex
      10/19/2014 alex
      i would look at all of the ground connections before parts. if the alternator was bad you wouldn't be able to restart it. with out a jump. also check the main battery cables for wear in them.
  • Criste
    Criste - 2007 Jeep Compass - Engine - 10/10/2014
    I have accidently turn on the 4 wheel drive, both Electronic Throttle Control and ESP lights go on. I can't turn it off
    I never use the 4wheel drive cause I live in the city so when I accidently pull the 4wheel lever on my car the Electronic Throttle Control and ESP lights go on and the car goes into an idueling shake and doesn't over first gear. It also makes ticking low loud noise ...
     
    0 answer
  • Devyan
    Devyan - 1999 Jeep Grand Cherokee - Engine - 10/10/2014
    What could be the cause of p0204 code and other codes for the 8 injectors
    Has codes for all injectors circuit open but still driving
     
    • Jimm
      10/10/2014 Jimm
      P0204 means that the PCM detected a fault in the injector or the wiring to the injector- cylinder number 4. It monitors the injector and when the injector is activated, the PCM expects to see the voltage pulled "low" or close to zero.
      The following description and guide applies to all other fuel injectors in the same fashion;

      When the injector is switched off, the PCM expects to see a voltage that is close to battery voltage or "high". If it doesn't see the expected voltage the PCM will set this code. The PCM also monitors resistance in the circuit. If the resistance is excessively low or high it will set this code.

      The causes of a P0204 engine light code could be any of the following:
      Faulty fuel injector. This is usually the cause of this code but doesn't rule out the possibility of one of the other causes;
      Open in the wiring to the injector
      Short in the wiring to the injector
      Faulty PCM

      Possible Solutions:

      First, using a DVOM (digital volt ohmmeter) check the resistance of the injector. If it isn't within specs, then replace the injector.
      2) Check for voltage at the fuel injector connector. It should have 10 volts or more.
      3) Visually check the connector for damage or broken wires.
      4) Visually check the injector for damage.
      5) If you have access to an injector tester, activate the injector and see if it operates.
      6) If the injector operates, then you likely have either an open in the wiring, or a blocked injector. If you do not have access to a tester, swap the injector with another one and see if the code changes.
      7) If the code changes, then change the injector.
      8)At the PCM, remove the driver wire from the PCM connector and Ground the wire. (Make sure you have the correct wire. If you're not sure, do not attempt) The injector should activate
      9) Replace the injector

  • emory
    emory - 1994 Jeep Cherokee - Engine - 10/2/2014
    I replaced radiator now ac doesn't work
    Replaced radiator ac compressor clutch doesn't engage jumped compressor and it engage s what the solution
     
    0 answer
  • emory
    emory - 1994 Jeep Cherokee - Engine - 10/2/2014
    I replaced radiator now ac doesn't work
    Replaced radiator ac compressor clutch doesn't engage jumped compressor and it engage s what the solution
     
    0 answer
  • carolyn k. siegal
    carolyn k. siegal - 1997 Jeep Grand Cherokee - Engine - 9/28/2014
    Gas gauge on the dash keeps moving from full to empty while in motion. If I can go over a rise in the roadway it moves
    It only happens when in action . Noticed it about 2 weeks ago. And, yes the check engine light stays on all the time.The gas pump icon comes on & off in sync w/the needle and a bell dings.
     
    • CVO
      9/28/2014 CVO
      1. Fuel tank gauges are usually float based, it's more likely it's a mechanical problem with the float.

      2.Check the vehicle for fault codes to see if there are any sensors were involved to the malfunction of the engine.

      1.Local auto parts stores such as Autozone ( not in California) or Advance Auto parts or Pep Boys will scan and retrieve any diagnostic trouble codes ( dtc ) stored in the powertrain control module for free of charge..

      2. Amazon.com has the code reader for less than $17.33 dollars + free shipping
      Autel MaxiScan MS300 CAN Diagnostic Scan Tool for OBDII Vehicles

      3.Re-post the dtc's in here " answer question " for further assistance.

      Note: we need the dtc's to identify the sensor, there are a dozen different ELECTRONIC sensors to operate the car.

      Visit this site and see all the different sensor definitions.

      Powertrain Control Module (PCM)
      Throttle Position (TP) sensor
      Mass Air Flow (MAF) sensor
      Intake Air Temperature (IAT) sensor
      Idle Air Control (IAC) valve
      Engine Coolant Temperature (ECT)
      Heated Oxygen Sensor (HO2S)
      Camshaft Position (CMP) sensor
      Knock Sensor (KS)
      Vehicle Speed Sensor (VSS)
      Crankshaft Position (CKP) sensor

      www.freeautomechanic.com

    • Jimm
      9/28/2014 Jimm
      1997 Jeep Cherokee Recall

      Item Affected: FUEL SYSTEM, GASOLINE: STORAGE: TANK ASSEMBLY Date Announced: 11/20/1997 Description of Recall: VEHICLE DESCRIPTION: MULTI-PURPOSE PASSENGER VEHICLES. THE FUEL TANK MOUNTED FUEL LEVEL SENDING UNIT ACCURACY CAN DEGRADE OVER TIME, INDICATING SIGNIFICANTLY MORE FUEL IN RESERVE THAN IS ACTUALLY PRESENT. Action Need To Fix It: DEALERS WILL REPLACE THE FUEL LEVEL SENDING UNIT. FIND YOUR LOCAL Jeep Service Center

      Replace the fuel level unit inside the fuel tank. The fuel tank must be drained or emptied - then the tank must be lowered to access the fuel level sending unit. The two things I've read is it could either be a bad connection to the fuel level sensor, and/or corrosion on the connection, or a bad fuel level sensor itself. The fuel level sensor is available as an aftermarket part, and it requires the gas tank to be dropped to access the fuel pump - since it's attached to it. Check the sensor with a voltmeter first.

      Have the stored fault codes or check engine light scanned - for free - at any local auto parts store; Advance Auto, Auto Zone, NAPA. Then, post a reply as 'add answer' with the specific code for more assistance. There may be a fault code stored in the OBD memory which may not be displayed as a check engine light.
  • Bill
    Bill - 1995 Jeep Grand Cherokee - Engine - 9/25/2014
    What will happen if the gas cap is missing
    Gas cap stolen
     
    • Jimm
      9/25/2014 Jimm
      Two things - fuel will evaporate, and the check engine light / fault code will indicate large leak in the fuel / evaporative emissions system.
  • Jeeplemieux
    Jeeplemieux - 2008 Jeep Wrangler (JK) - Engine - 9/25/2014
    Jeep was shaking bad, couldn't drive, tried to turn it off and kept running?
    (I drive a manual) I went to the gas station to grab coffee and I came back out and turned the jeep on, reversed, and when I shifted into 1st gear the car wouldn't move at all and it was shaking horribly. I decided to then turn it off and it proceeded to shake and ...
     
    0 answer
  • Jeeplemieux
    Jeeplemieux - 2008 Jeep Wrangler (JK) - Engine - 9/25/2014
    Jeep was shaking bad, couldn't drive, tried to turn it off and kept running?
    (I drive a manual) I went to the gas station to grab coffee and I came back out and turned the jeep on, reversed, and when I shifted into 1st gear the car wouldn't move at all and it was shaking horribly. I decided to then turn it off and it proceeded to shake and ...
     
    0 answer
  • Jeeplemieux
    Jeeplemieux - 2008 Jeep Wrangler (JK) - Engine - 9/25/2014
    Jeep was shaking bad, couldn't drive, tried to turn it off and kept running?
    (I drive a manual) I went to the gas station to grab coffee and I came back out and turned the jeep on, reversed, and when I shifted into 1st gear the car wouldn't move at all and it was shaking horribly. I decided to then turn it off and it proceeded to shake and ...
     
    0 answer
  • THOMAS4805
    THOMAS4805 - 1993 Jeep Grand Cherokee - Engine - 9/23/2014
    TRYS TO START BUT WONT KEEP RUNNING
    WAS RUNNING FINE BUT NOW WONT START GETTING FIRE AND GAS POUR GAS DOWN THROAT RUNS TILL GONE
     
    • CVO
      9/23/2014 CVO
      Have an assistant to turn on the ignition switch, while you listen to the fuel pump running for 2 seconds from the uncap fuel tank filler. No noise, take the next step.
      Try giving the bottom of the fuel tank a few whacks with a flat piece of wood or a rubber mallet while another tries to start the engine. You have a 50/50 shot at getting the pump going again and the vehicle starting. if it starts as a result of the whack then it confirms the bad fuel pump.

      Remove the plug from the test port and engage a test port fitting in its place.
      Connect a fuel pressure gauge to the test port fitting.
      Start the engine and let it idle.
      The pressure gauge should read 14-15 psi (97-103 kPa).
      If the pressure is correct the fuel pump is operating normally.

      If the fuel system pressure isn't in the criteria, replace the fuel pump.Testing the fuel pump, it will test the present of the 12 volts connection as well.
      CVO
      9/24/2014 THOMAS4805
      not fuel problem or fire getting plenty of both pour gas in throttle body will run it out but wont keep running
      CVO
      9/25/2014 CVO
      " GAS POUR GAS DOWN THROAT RUNS TILL GONE " meant the engine was running from a different fuel source than the gas source from the fuel pump.
  • kdimpsey2
    kdimpsey2 - 1998 Jeep Cherokee - Engine - 9/23/2014
    Why won't my engine stay on during/after a jump start?
    While trying to jump start my Jeep Cherokee, the electrical components in my car come on and the starter works in neutral, but the engine only stays on if my foot is on the gas. As soon as I take my foot off the gas, the engine shudders to a stop again, but all the ...
     
    • jdl
      9/23/2014 jdl
      Make sure the battery has a full charge. If the battery is down, take it off and get it charged. Shouldn't let the alternator charge a down battery. Check the charging system.

      How long since a tune-up? Are there any applicable trouble codes?
  • kdimpsey2
    kdimpsey2 - 1998 Jeep Cherokee - Engine - 9/23/2014
    Why won't my engine stay on during/after a jump start?
    While trying to jump start my Jeep Cherokee, the electrical components in my car come on and the starter works in neutral, but the engine only stays on if my foot is on the gas. As soon as I take my foot off the gas, the engine shudders to a stop again, but all the ...
     
    0 answer
  • Larry Halterman
    Larry Halterman - 1997 Jeep Grand Cherokee - Engine - 9/18/2014
    No spark to plugs. Cranks good but will not start.
    New battery, ignition coil and relay fuse but still not starting.
     
    0 answer
  • dantesdaddy
    dantesdaddy - 1998 Jeep Grand Cherokee - Engine - 9/16/2014
    Why want my jeep start? All it will do is click
    it started about a two months ago,it would just click once and would crank, it then it went to twice I carried it to the mechanic he said the starter was the battery was good but when i got it home it still wouldn't. Crank i ttobit back put a circuit breaker on done ...
     
    0 answer