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dodge 1998 5.2 igition timing of 30 degrees

Discussion in 'Mechanic and Repair' started by JCLawn and more, Jul 14, 2013.

  1. JCLawn and more

    JCLawn and more LawnSite Fanatic
    from MI
    Posts: 5,204

    So I replaced my dodge 1998 5.2 intake manifold gaskets, cap, rotor, wires and plugs and the timing while at an idle is advancing 15-30 degrees from what the computer says. Me and 2 friends have been trying to figure out why. The timing is not set with the distributor, but the computer. Its so bad that while accelerating cylinders 1,5,6 misfire. Anyone ever had this issue before? The cap and wires are where they should be according to the book. We have tried multiple combinations but same thing every time. Before this it would ping under load running 87 octane so its always been advanced, but it ran like a raped ape. Help guys! I don't whant this in to a dealer who is the only one who can reset the pcm.
     
  2. Patriot Services

    Patriot Services LawnSite Fanatic
    Posts: 12,440

    Did you move the distributor at all? The dist still needs to be properly indexed for the computer to sense properly.
     
  3. JCLawn and more

    JCLawn and more LawnSite Fanatic
    from MI
    Posts: 5,204

    No it has not moved. I've had the truck since 128,000 and its 190,000 now. Just the cap came off. Everything I've read said the indexing is for fuel inection timing, not igition (which does not make sense in my mind)
     
  4. Patriot Services

    Patriot Services LawnSite Fanatic
    Posts: 12,440

    Any PCM codes?
     
  5. JCLawn and more

    JCLawn and more LawnSite Fanatic
    from MI
    Posts: 5,204

    Just the misfired cyliders and my speed sensor, which I have replaced and still is not working right. It bounced on and off
     
  6. Patriot Services

    Patriot Services LawnSite Fanatic
    Posts: 12,440

    I think you have a PCM issue. That's a lot of miles on it. It learned its program off the old parts and probably took a set. It may have lost it learning ability or the initial program was wiped. A reman and flashed PCM is about 200 bucks.
     
  7. JCLawn and more

    JCLawn and more LawnSite Fanatic
    from MI
    Posts: 5,204

    Whould a worn timing chain play into it?
     
  8. Patriot Services

    Patriot Services LawnSite Fanatic
    Posts: 12,440

    Possibly if it jumped a tooth.
     
  9. Patriot Services

    Patriot Services LawnSite Fanatic
    Posts: 12,440

    What was it doing wrong before you changed all those parts?
     
  10. JCLawn and more

    JCLawn and more LawnSite Fanatic
    from MI
    Posts: 5,204

    Just ping under load and speed sensor would work randomly even with a new one. Called o'rilley's and the guy who took the called would put money on the pcm. His went out at about the same milage and he said the speed sensor thing along with what its doing points to the pcm.
     

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