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My son's 1998 Jeep Cherokee 4.0L has had the block replaced and every sensor as well, some twice. New exhaust, another fuel pump assembly, etc. It runs okay, but then pops, bucks, etc.

I'm thinking faulty cam, but the problem isn't consistent. Looking for some thought before he tears into it for that.

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  • Jeep Master
  • 3,223 Answers

Id bet money its the pcm. what to try is start it up and wiggle the connectors going into the pcm. there are 3 connectors. if it does when you do this it is because there are broken connections inside the unit. junkyard part may fix it but it also could have the same problem.

Posted on May 05, 2017

  • hudsonterror May 05, 2017

    PCM has been replaced with a rebuilt, but I've pass the suggestion on. He tried it without any change in operation. He even took for a test run. No change. Thanks for the suggestion.

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I have a 1998 Jeep cherokee sport. Was driving today and it died. Now there is no spark and no power to fuel pump. Changed fuel pump today and it won't run. Recently replaced oxygen sensors too


U need to check the crankshaft position sensor. The fuel pump will only have power for 2 seconds I till it sees a crank signal. It' controls the asd relay which turns on your spark and fuel

Apr 19, 2013 | 1998 Jeep Cherokee

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Where is the fuel filter of the grand cherokee 1998


1998 Jeep Grand Cherokee 4WD 5.2L MFI 8cyl the Fuel Filter is part of the fuel pressure regulator assembly which is located on the fuel pump module.The fuel pump module is located on top of the fuel tank.


Hope this helps (remember to rate this answer).

Jan 06, 2011 | 1998 Jeep Grand Cherokee

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FUEL PUMP REPLACED TWICE..NEW CAP, ROTOR,WIRES,PLUGS AND FILTER. INITINAL START UP REQUIRES EXCESSIVE SPIN OVER. WHAT CAN CAUSE THIS CONDITION ON A 98 4.0 FUEL INJECTED JEEP?


could be the fuel pump relay, do you hear the pump prime when you turn on the key? if not then replace the fuel pump relay.

May 13, 2010 | 1998 Jeep Cherokee

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My sons jeep grand cheeokee started cutting out and then died i got it running and got it home put some fuel injertor cleaner in it then this morning it turned over but wouldnt fire. my other son put a new...


At the back of the engine in between the trans. and engine is a crank sensor. It's on the pass. side of the block. Follow the crank sensor wiring that runs under the engine to see if the harness is broken. If it's in good shape then replace the crank sensor.

Mar 29, 2010 | 1995 Jeep Grand Cherokee

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What is the torque specs for a 1998 jeep Cherokee classic straight 6 4.0 liter? I am replacing the head gasket and need to find the lbs of torque. Thank you for any advice, pictures, etc.


Torque sequence ------------------ front | 12 8 4 1 5 9 13 | of | | engine | 11 7 3 2 6 10 14 | ------------------ Final torque must be reached in 3 equal steps Step 1: torque all bolts (except bolt 11) to 110 Ft/Lbs Step 2: torque bolt 11 to 100 Ft/Lbs Recheck final torque in sequence.

  1. Disconnect the negative battery cable.
  2. Drain the cooling system.
  3. Disconnect the hoses at the thermostat housing.
  4. Properly relieve the fuel system pressure.
  5. Remove the cylinder head cover.
  6. Loosen the rocker arms.
  7. Remove the pushrods.

The valvetrain components must be replaced in their original positions.
  1. Remove the intake and exhaust manifold from the cylinder head.
  2. Disconnect the spark plug wires and remove the spark plugs.
  3. Disconnect the temperature sending unit wire, ignition coil and bracket assembly from the engine.
  4. Remove the accessory drive belt(s).
  5. Unbolt and set aside the power steering pump and bracket. Do not disconnect the hoses.
  6. Remove the intake and exhaust manifold assembly.
  7. If equipped with A/C, perform the following:
    1. Remove the compressor and position it aside with the lines attached.
    2. Remove the compressor bracket bolts from the cylinder head.
    3. Loosen the through bolt at the bottom of the bracket.

  8. Remove the alternator.
  9. Remove the cylinder head bolts, the cylinder head and gasket from the block.

Bolt No. 14 cannot be removed until the head is moved forward. Pull the bolt out as far as it will go and suspend in place by wrapping with tape.
  1. Discard the gasket. Thoroughly clean the head-to-block mating surface.
  2. Clean and inspect the cylinder head thoroughly. Refer to the engine reconditioning portion outlined later in this section.

To install:
  1. Coat a new head gasket with suitable sealing compound and place it on the block. Most replacement gaskets will have the word TOP stamped on them.

Apply sealing compound only to the cylinder head gasket. Do not allow sealing compound to enter the cylinder bore.

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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

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