cold start sound

  1. jackdevinemusic

    Cold start / idle issue

    First post! Recently, my Jeep (03 4.0) has developed an issue when trying to start. I originally thought it was due to the cold weather, but now it doesn’t want to turn over unless I press the throttle pretty far down. I cleaned the throttle body and the IAC, but I’m wondering if the IAC motor...
    • jackdevinemusic
    • Thread
    • cold start cold start sound iac iac valve idle issue jeep 4.0 starting issues starting issues when cold throttle body vacuum leak
    • Replies: 2
    • Forum: TJ General Discussion
  2. B

    Tapping Sound on Cold Start

    Greetings. I'm looking for some assistance on a new sound. I replaced the lifters about 500 miles ago. I'm not sure if that is related or not to the new sound, but thought I'd mention it. On cold start, it's a loud tapping most noteable underneath the engine. The sound goes away after...
    • Bill
    • Thread
    • cold start sound cold start tapping engine noise tapping sound
    • Replies: 24
    • Forum: TJ General Discussion
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