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  1. DaveB

    4.0 motor pinging under load

    It doesn't have an EGR valve...
  2. DaveB

    4.0 motor pinging under load

    The timing is set with a pin on the block and a notch on the distributor. I could try putting it off one tooth on the distributor or off of the notch but I would have to see how far off it would be if I did that. I checked the TDC mark and it appears to be correct.
  3. DaveB

    4.0 motor pinging under load

    I checked the timing and it is usually 12 degreees at idle with an occasional drop to 10. The advance at high speed and under a load with the RPMs up is around 35 degrees. I put a piece of tape with half inch marks on the dampner to estimate the high speed timing so I could be a bit off. I'll...
  4. DaveB

    4.0 motor pinging under load

    It is about 10-12 degrees at idle if I am reading the marks correctly, haven't checked it under a load, when I rev it a bit it looks like it goes up about 8-10 degrees more. I'll try to test it under load tonight. It doesn't ping much at high RPMs but more at low RPMs with a load. I may also...
  5. DaveB

    4.0 motor pinging under load

    Well the oxygen sensor made no difference, neither did replacing the computer. I put in some premium gas and some BG44k cleaner that is supposed to be really good. It is getting better than it was but will still ping if I let it go into overdrive on hills. The wife took it in for emissions...
  6. DaveB

    4.0 motor pinging under load

    Haven't done it yet, had to go to work. My son also bagged a nice buck over the weekend so we will be cutting it up tonight. I plan on moving the vacuum line first, then check the TPS which can also cause pings according to what I read, swap the throttle body, and check out the exhaust sensor...
  7. DaveB

    4.0 motor pinging under load

    I just have the standard cj temp gauge which doesn't show numbers just C-H. I did check with a thermometer in the thermostat housing when it was warm and it read about 190 degrees. I'll try moving the map sensor feed and also try an xj throttle body. The throttle bodies look very similar and I...
  8. DaveB

    4.0 motor pinging under load

    Thanks for the replies, I am running 4412 Champion plugs. They do look like there is a bit of a lean burn (tip is a white) but they haven't been in long. I am pretty sure the rods aren't knocking, it just has the standard spark pinging sound on acceleration. I will check for manifold leaks. I...
  9. DaveB

    4.0 motor pinging under load

    Well the tailpipe didn't help, the MAT sensor swap helped a bit. The temp sensor checked out ok as did the MAT. Timing looks good. Ping happens more when the engine has warmed up and not much at all when cold. The fuel rail pressure is exactly what my manual says it should be. So I guess I need...
  10. DaveB

    4.0 motor pinging under load

    There was some small amount of old stuff but I added 10 gal of new stuff a couple of weeks ago. I used regular 85 octane. None of the other 4.0 jeeps in the family ping with regular and I hope I don't need the high octane stuff. I checked the MAP sensor last night and it checked out good. Today...
  11. DaveB

    4.0 motor pinging under load

    Well I finally got a temporary permit for my scrambler so that I can drive it to the muffler shop to get it ready for inspection and it seems to ping a lot under load. I compared the timing to my 92 cherokee and it looks to be the same. I don't have a tailpipe on it and the exhaust system that...
  12. DaveB

    Anyone had luck painting a fiberglass hardtop ?

    Now that my Scrambler is all painted and looking nice I need to paint the faded hardtop for it. The top is white on the outside and shiny black gelcoat on the inside. So what would be the best way to paint it ? I want it grey on both sides. Thanks, Dave
  13. DaveB

    October Giveaway!!!

    Count me in.
  14. DaveB

    Topic of Discussion TOD: Sheet Metal fab

    No, I was just adding to the ideas.
  15. DaveB

    Topic of Discussion TOD: Sheet Metal fab

    When you are filling a rust hole with new metal it can be a challenge to get the new piece to fit the hole you cut out. The way that I have found that works well is to lay the new metal over the hole to be fixed then with a very thin cut off wheel cut through both pieces. The new piece will fit...
  16. DaveB

    New toy! Can't wait for snow!

    Looks like the color matched up OK, hopefully it stays on.
  17. DaveB

    Gaskets under my jeep hinges ?

    I just painted the jeep project yesterday and will be assembling it in a few days after I let the paint dry more. I was planning on cutting out gaskets to put between the sheet metal and the hinges to keep rust from building up under the hinges. Will this help or should I not worry about it ...
  18. DaveB

    wagoneer springs on a yj

    They were wagoneer front springs. They came off of an 81 waggy.
  19. DaveB

    I should help my brother more often

    Well there are lots of minivans out there, maybe we could cut your jeep through the center and add a van section so you could haul more of your friends around. :)
  20. DaveB

    I should help my brother more often

    That is most likely what I will do, the shafts however are not the same length so I would need two spares. Maybe I can "borrow" my son in law's 44 axle shaft that has been sitting in my garage for months, maybe he won't notice. Dave
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