DX/DPFI techie needed (solved + pics)

genedaddygenedaddy Wagonist
in Engine & Drivetrain
have a missfire on the #3, changed the plugs, cap, and rotor; as well as the spark plug seals. wire is good, checked for spark. after fixing all this car sounds like it's running great, but it still has the miss...the assumption we are going with is something with the fuel system. anyone have any ideas? when we pulled the plugs 1,2,3 where dripping oil and #4 was WAY white. not familiar with the dpfi setup, help is greatly appreciated.

thanks

Comments

  • evol911evol911 familEE
    When the valve cover seals start leaking they let oil down into the sparkplugs. Just a little bit of oil will foul out those plugs. You will see what looks like brown stain going up the spark plug towards the top. I would say replace the valve cover gaskets and replace plugs.


    These gaskets:
    http://bkhondaparts.com/billkay/jsp/prddisplay.jsp?catcgry1=CIVIC&catcgry2=1991&catcgry3=WGN+4WD+1600&catcgry4=KA5MT&catcgry5=CYLINDER+HEAD+COVER&ListAll=All&vinsrch=no&systemcomp=Engine&prdrefno=&quantity=0&act=&count=0&hidSwitch=Switch&hidIrno=%7C003
  • genedaddygenedaddy Wagonist
    when i said spark plug seals, that is the part i was refering to, thanks for the response but still looking for the solution
  • evol911evol911 familEE
    Sorry, I must have skipped that part about replacing those seals. I'm trying to think of anything else but nothing comes to mind. Are saying oil is getting into the cylinders? Or was the oil on the plugs from before the seals were changed?
  • genedaddygenedaddy Wagonist
    oil on plugs from before seals where change, when i changed the seals i also changed the plugs. wires were still good, brand new cap and rotor. this problem seems to be stuping the guys on honda-tech too.
  • evol911evol911 familEE
    What about the timing? Have you checked that? Might as well go over the easy stuff first.
  • genedaddygenedaddy Wagonist
    will double check
  • shenrieshenrie Council Member
    Fuel filter is always good to check if you dont know the last time it was replaced. I know it sounds weird, but check the grounds. Weird shit happens with bad grounds.
  • genedaddygenedaddy Wagonist
    timing is on, feul is flowing through the lines (pump works)...my buddy drove the car to work yesterday and the check engine light came on, codes 1 and 16...o2 and fuel injector.

    when we checked the injectors all the wiring looks good so we unplugged the harness from the top injector (brown) and nothing kept running the way it was. then we pulled the harness for the lower injector and the car immediately stalled out. assuming its a bad top injector, getting one from a friend to try and swap it out. which injector is the one that runs all the time and which one is the one that only comes on under load.

    thoughts/suggestions?
  • genedaddygenedaddy Wagonist
    solved the problem sort off, pulled the head off and there are chunks of valve missing on the exhause side, i'll get you a picture later
  • evol911evol911 familEE
    genedaddy wrote:
    solved the problem sort off, pulled the head off and there are chunks of valve missing on the exhause side, i'll get you a picture later

    Damn chunks of valves??? Did it just kick the pieces oout the exhaust or scar the cylinder walls?? Thats crazy that it just busted some pieces off.
  • Eagle BeagleEagle Beagle familEE
    :shock: unbelievable ... i say hall of fame ...

    : )
  • genedaddygenedaddy Wagonist
    cylinder walls look ok, thinking the pieces when out the exhaust side. before the car died we did notice it seemed to be running rich. car had 240k on it, the best we can come up with is with all that carbon build-up on the pistons the motor became high compression and it got a little detonation. we had never seen it before either. another interesting issue was that it took 2 hours to "lift" the head off. three guys lifting and it still wouldn't budge, after some serious prying in finally broke off.

    check back for the pics
  • genedaddygenedaddy Wagonist
    Just looking at the first pic do you see the problem. Look at the #3 cylinder (2nd on the left)...

    13.jpg
    14.jpg
    15.jpg
    16.jpg
  • Eagle BeagleEagle Beagle familEE
    :shock: unbelievable ... UFO ? Area 51 ? Rosswell ?

    I give up, my eyes go screwy ...

    o wait, the back end of a donkey, close up ?
  • Old SkoolOld Skool Council Member
    ah yes a chunks out of a valve :cry:... my wife's conv civic has done the same thing.. too much boost and not enough fuel :(
  • genedaddygenedaddy Wagonist
    this motor wasn't boosted
Sign In or Register to comment.

© Vanilla Keystone Theme 2025