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Jeep 4.0 Engines: How to Rebuild and Modify

Jeep 4.0 Engines: How to Rebuild and Modify (Sa Design)Has anyone picked up a copy of the Jeep 4.0 Engines book? Let us know your thoughts!In this Workbench title, veteran author and Chrysler/Jeep engine expert Larry Shepard covers the rebuild of an entire engine in exceptional detail. He also delves into popular high-performance modifications and build-ups. Step-by-step photos and captions cover each crucial step of the engine disassembly. He shows the inspection of all critical parts, including block, heads, rotating assembly, intake, and exhaust. Critical machining processes are covered, including decking the block, line boring, and overboring the block. The book provides exceptional detail during the step-by-step assembly so your engine is strong and reliable. Installing a larger-displacement rotating assembly (or stroker package) is one of the most cost-effective ways to increase performance, and the author covers a stroker package installation in detail.

 

Troubleshooting No-Start Issues

 Most Common Reasons

  1. CPS
  2. Starter or Starter Solenoid
  3. Fuel Pump
  4. Distributor (up to 99 only)
  5. PCM / ECU

Runs Erratic under Load / Accelaration

  1. If backfires through intake, check for Clogged Fuel Pump
  2. If it pings and runs hot
    1. Check Timing (Advanced or Retarded Timing)
    2. Make sure the Distributor case bolt is tight.   You shouldnt be able to turn the whole distributor by hand

Instrument Cluster / Gauge Troubleshooting

 Sporadic or Intermittent Gauge Behavior

  1. Remove Instrument Cluster
  2. Unplug the connector harness and clean with contact cleaner
  3. Re-Plug the connectors firmly

If your connector pins are corroded and unusable, buy a new connector (Part Number 05016261)

If only the Speedometer is intermittently maxing itself out: