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YJ FAQ  

Introduction [Engine] Transmissions and Transfer Cases
Body Axles Frames and Suspension
Brakes and Steering Wheels & Tires Gauges and Non-Engine Electrical
Newbie Stuff Miscellaneous
  
YOUR participation is what makes the YJ FAQ a useful resource. If you have something to add to it, click HERE. There will be a 20-sec delay to foil email collection 'bots.
DO NOT send me any questions about problems you're having with your Jeep because I don't have time to answer them. Sorry.

  • 258 (4.2L) Carb Computer - How to Bypass
  • 4.2L to 4.0L Engine Swap
  • Air Box Intake Re-Routing (4.0 L)
  • Air Filter Sucking Oil
  • Alternator Upgrade - Dodge Alternators in a YJ
  • Alternator Upgrade - GM Alternators in a Jeep
  • Backfiring
  • Bigger Oil Filter
  • Carter Carb Rebuild
  • Cheap Cone Filter Option for 3-bolt Jeep Throttle Bodies
  • Cleaning/Adjusting the AIS (stepper) Motor
  • Diagnosing a Cracked Intake/Exhaust Manifold
  • Diagnosing Electronic Ignition Systems
  • Diagnosing Problems With Computer-Controlled Carburetors
  • Diagnostic Codes
  • Engine Overheating - Troubleshooting
  • Engine Quits Intermittently
  • Engine Won't Turn Over
  • Gasoline Smell
  • High Idle
  • High Idle When Starting (4.0L)
  • Ignition Upgrade Opinions
  • Jeep 4.0 EFI engine stalls at a stop (Jeep 4.0 stalling)
  • Low Oil Pressure Problems?
  • MAINT REQ Light (Maintenance Required)
  • Mopar MPI Info
  • Newer Mopar Harmonic Balancers Not the Same As Older Units
  • Rear Main Oil Seal - Installation
  • Replacing a 4-cyl motor with a 4.0L 6-cyl motor
  • Replacing the Crank Position Sensor (CPS) and Harness
  • Rough Idle / Stalling
  • Runs and Sputters After Turning Off
  • Starting - How to Improve
  • Swapping a 4.0L head onto a 4.2L block
  • Swapping a 4.0L into a 4.2L Jeep
  • Swapping a 4.0L Throttle Body onto a 2.5L Motor
  • That Weird Torx-like Bolt on the Top of the Bellhousing
  • Three Reasons NOT to Disconnect the Speed Sensor
  • TPS Sensor Failure
  • Vacuum Hose Tips

258 (4.2L) Carb Computer - How to Bypass

There is a write-up of the procedure here:

  www.outdoorwire.com/4x4/jeep/tech/electrical/jn-ignition99/


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