pentastar

  1. C

    C0021 code after replacing booster

    I recently replaced the power brake booster, brake booster vacuum sensor, brake light switch, and air pump. After completing this I did a brake flush and bled all of the calipers. I am still getting a stiff brake pedal and a C0021 code. After replacing the brake booster with a second new unit...
  2. J

    2017 JK Unlimited Hard Start When Sitting

    Hi there, I have been experiencing a hard start after my Jeep has been sitting for anything over an hour. Once started it idles and drives perfect. I recently replaced the seals and oil pressure sensor in my oil filter housing. Also a fuel injector due to a misfire and then the intake manifold...
    • Jax Sisson
    • Thread
    • hard start hard start after sitting jk pentastar staring issue after oil filter housing replacement starting issue
    • Replies: 12
    • Forum: JK General Discussion
  3. M

    #5 cylinder misfire & secondary coil ground fault

    Howdy! I'm an old school diesel guy, so I'm a bit out of my depth. Just bought our first wrangler. 2013 jku Sahara manual 38,00 mi. Love it except for this issue which has me bewildered. I've replaced the spark plugs with ngk ones. Swapped the coils from 1 to 5 and the problem remained. @...
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