Results 1 to 8 of 8

Thread: chronic missing 3.9

  1. 18th January 2011, 06:54 PM #1
    boot's Avatar
    boot
    boot is offline Fossicker
    Join Date
    Dec 2008
    Location
    dunedin new zealand
    Posts
    53
    Total Downloaded
    0

    chronic missing 3.9

    so got the dizzy and coil wet on Sunday. brake cleaner got it all running sweet. took it home cleaned it all down gave it a good blow out with compressor and coated it with crc water displacer stuff. put it all back together but today it started missing very badly.

    motor revs nicely when in neutral
    motor doesn't rev and misses a lot under load.
    i've tryed the pull one lead at a time to find it but it idles fine so thats not working
    rotor seemed a little burt as did the points in the cap?

    any advice would be great

    its in a 91 3.9 range rover
    Reply With Quote Reply With Quote
  2. 18th January 2011, 06:58 PM #2
    PhilipA
    PhilipA is offline Swaggie Subscriber
    Join Date
    Jan 1970
    Location
    Avoca Beach
    Posts
    14,152
    Total Downloaded
    0
    Sounds like some condensation has returned to the dizzy cap to me. clean the cap with metho.
    Regards Philip A
    Reply With Quote Reply With Quote
  3. 18th January 2011, 08:06 PM #3
    astormsau
    astormsau is offline Fossicker
    Join Date
    Jun 2008
    Posts
    90
    Total Downloaded
    0
    a little bit out there, perhaps the cool water got to a plug and it developed a fault, ie a hairline crack... that can cause misfiring under load... has happened on my D2

    Drew
    Reply With Quote Reply With Quote
  4. 18th January 2011, 09:17 PM #4
    bee utey's Avatar
    bee utey
    bee utey is offline AT REST
    Join Date
    Apr 2009
    Location
    Crafers West South Australia
    Posts
    11,732
    Total Downloaded
    0
    As PhilipA says, more condensation. Hair dryer to the dissy, take the clear plastic cover off first. This always happens after a drowning! And blow dry the cap and lead ends. Leave off the crc, a good polish with a clean rag is better for the cap. CRC attracts dirt that holds moisture when the crc finally evaporates.
    Reply With Quote Reply With Quote
  5. 19th January 2011, 10:04 AM #5
    PAT303
    PAT303 is offline OldBushie
    Join Date
    May 2007
    Location
    Safety Bay
    Posts
    8,041
    Total Downloaded
    0
    Clean the coil lead ends also. Pat
    Reply With Quote Reply With Quote
  6. 23rd January 2011, 07:48 AM #6
    boot's Avatar
    boot
    boot is offline Fossicker
    Join Date
    Dec 2008
    Location
    dunedin new zealand
    Posts
    53
    Total Downloaded
    0
    ok so got new leads and plugs and its firing fine seems to be still missing when your foot is just on the gas. so I've tested all the sensors, and it seems that the tps is having a laps.

    1v at closed and 5.2v everywhere else in the way to wide open. so I'm assuming that this is wrong and it should have a smooth gradual climb in voltage from closed to open.

    so the question now would a faulty tps be enough for it to over fuel and cause it to miss? its fine if your hard up it throttle wide open and fine at idle its just in-between
    Reply With Quote Reply With Quote
  7. 23rd January 2011, 11:40 AM #7
    PhilipA
    PhilipA is offline Swaggie Subscriber
    Join Date
    Jan 1970
    Location
    Avoca Beach
    Posts
    14,152
    Total Downloaded
    0
    so the question now would a faulty tps be enough for it to over fuel and cause it to miss?
    Yes yes yes.
    Regards Philip A
    Reply With Quote Reply With Quote
  8. 23rd January 2011, 12:08 PM #8
    boot's Avatar
    boot
    boot is offline Fossicker
    Join Date
    Dec 2008
    Location
    dunedin new zealand
    Posts
    53
    Total Downloaded
    0
    cool so I'll try replacing that tomorrow and see how it goes! might even get my fuel bills down
    Reply With Quote Reply With Quote
« serviced the ZF today | Engine Upgrade »

Bookmarks

Bookmarks

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •  

Forum Rules

Search AULRO.com ONLY!
 Search All the Web!