Engine

2001 JEEP CHEROKEE
4WD • AUTOMATIC
Avatar
BEVMATHERLY
  • MEMBER
  • 1 POST
Installed new long block in a 2001 Jeep Cherokee 4.0L. Upon starting for the first time, the engine goes to full throttle (runs away)while the throttle plate remains closed. Some backfiring occurs. We immediately turn engine off when it starts to rev. What could possibly be wrong?
Jul 5, 2011 at 10:31 PM
Advertisement
Avatar
RIVERMIKERAT
  • ✓ASE Certified Mechanic
  • 6,110 POSTS
  • ASE Certified Mechanic
Backfiring means a timing issue, either crossed plug wires or timing set incorrectly. Make sure the pressure regulator is working properly. If there is too much pressure getting to the injectors, they will spray more fuel than normal and cause the engine to run faster than desired.
Jul 5, 2011 at 11:40 PM
Join 2CarPros for free, one of the most advanced car repair communities on the internet. From first-time drivers to seasoned mechanics, everyone is welcome to reply, share details, and get better answers. You can add a temporary image or video first; uploads are limited to 20 MB.
Ask a Free Question
Repair Safety Notice: This information is for general instructional purposes only. Vehicle repair can be dangerous. Verify all information, follow manufacturer service procedures, use proper tools and safety equipment, and consult a qualified repair shop when needed.