Question about 1999 Jeep Cherokee 4WD
This 4.0 liter engine is hard to start and stalls while driving. fuel pump pressure is okay. OBD shows no codes
You might find the outboard PCM cover ***** are shorting out the circuit board...In the engine compartment on the passenger side of the firewall, aft of the coolant reservoir. You will have to remove the reservoir. The PCM is a square metal box mounted vertically to the firewall with three bolts. On the front, you will find three large rectangular connectors, one black, one white, one gray. Beneath the two outer connectors, you will find the two screws. You do not need to remove the connectors. The screws use a #25 Torx bit for removal. Back the screws out about 1/4" and see if that makes a difference..If so install two new 1/4 or 3/8 #6 sheet metal screws and you should be good to go.
Posted on Mar 13, 2016
If your fuel system is ok(which it sounds like you've checked) go to the distributer cap and rotor,these often get hairline cracks which are not apparent by looking at them, but are cheap to replace. Also while in there make sure everything else looks clean and situated correctly. Then change your spark plugs and if they are not newer,better ones, your spark plug wires too, this often has a profound effect on starting and running smooth all by itself. Use good quality parts (No Champion plugs for example,have run into to many that fail new or shortly afterwards) and change your air filter while your under the hood. You can also use seafoam (slowly added to hose for intake while manually raising the rpms,and the other half of the bottle added to fuel tank) to clean the intake system.If you do this,do it BEFORE you change the plugs as it often fouls them,and is perfect to do before you change them out, Drive a few miles after using the seafoam as well,then change out the plugs and wires etc..
Posted on Apr 14, 2015
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Posted on Jan 02, 2017
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