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1989 D100 3.9L a/t Pinging issue

Discussion in 'Dodge Ram' started by PlumCrazy4Mopar, Apr 15, 2018.

  1. PlumCrazy4Mopar

    PlumCrazy4MoparMember

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    I just acquired a 1989 Dodge D100. This truck is the 3.9 L automatic. The codes displayed are 12, 23, 55. This truck was described as having a knock. I hear a lifter, but otherwise the truck pings badly. I was hoping for some ideas as to where to look to correct the issue. I know for the most part the computer sets the timing. It shows 38000 miles. Probably 138000 or more. I am thinking about the timing chain. Thank you.
     
  2. 65 sporty

    65 sportyWell-Known Member

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    Code 12 is from battery disconnect, 23 is IAT (intake air temp) voltage too high or too low, 55 is the end of code messages.
    This will help
    Chrysler Computer Codes, 1980s-1990s

    If it's pinging(spark knock) start with the ignition timing. The computer can control timing, but you can set the base ignition timing. I believe you disconnect the coolant temp sensor to set the base timing.
     
  3. PlumCrazy4Mopar

    PlumCrazy4MoparMember

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    Thank you, 65 sporty.