Thread: Cylinder 4 Misfire (Fuel Injector?)

Results 1 to 3 of 3
  1. #1 Cylinder 4 Misfire (Fuel Injector?) 
    SE Level Member
    Join Date
    Jan 2017
    Location
    Alabama
    Posts
    18
    Thanks (Received)
    0
    Likes (Received)
    0
    Dislikes (Received)
    0
    Chats
    0
    I have a naturally aspired 06 Grand Prix that is throwing the code for a misfire on Cylinder 4. I've swapped wires, plugs, and coil pack, but it is still misfiring. I actually have visually checked the plug and it's firing as expected, so I don't believe it's on the "fire"side.

    I'm now thinking it's fuel related. This car has 300k miles on it and still has the original injectors, so I'm wondering if one of those have failed. My plan was to swap a couple and see if the problems move or to disconnect and reconnect the wire to it. However, I'm having trouble figuring out how to remove the injectors or operate the clip on the wiring harness.

    What's y'all's ideas about what may be going on? Also, can anyone explain to me how to remove those injectors?

    A could of other pieces of info. I checked the compression all the way around. The front 3, and rear left were all around 115-120. Cylinder 4 (misfiring) and Cylinder 6 (beside it) were up around 155-160, if I remember correctly. What would cause a higher compression on those two cylinders? Also, I've had what I suspect to be a lifter ticking for a while. I looked at the valves and they all seem okay, so I've just let it ride due to the complexity of fooling with the lifters in this car.
    Reply With Quote  
     

  2. #2 Re: Cylinder 4 Misfire (Fuel Injector?) 
    Killa Bee Scottydoggs's Avatar
    Join Date
    Aug 2010
    Location
    new jersey
    Posts
    39,995
    Thanks (Received)
    63
    Likes (Received)
    166
    Dislikes (Received)
    5
    Chats
    243824
    my 98 injector plugs had a metal bar on one side, push that bar in and it unlocks the plug. no idea if they are the same on a 06 tho.

    98 Buick Regal GS, F body brakes, Caddy STS wheels, tinted tails L36 bottom end, lightly ported heads, 1.95 roller rockers, headers, gen 5 N* 3.0 pulley, FSIC, 42 lb injectors, a BrandonHall rebuilt trans, DHP tuned and AEM water/Meth injection https://goo.gl/gpV5kW
    Reply With Quote  
     

  3. #3 Re: Cylinder 4 Misfire (Fuel Injector?) 
    Turbo is the way to go. BillBoost37's Avatar
    Join Date
    Jul 2009
    Location
    W Spfld
    Posts
    26,833
    Thanks (Received)
    53
    Likes (Received)
    90
    Dislikes (Received)
    1
    Chats
    98246
    The 06 will have a colored safety tab you need to sneak back or out with a pick/small screwdriver. Once it's out/backed out a bit, you should be able to push down on the piece it kept from being pushed down and then pull the connector off. Then you need to remove the 4 10mm nuts holding the rail down and from there you should be able to get them.
    I drink..so consider that when reading my posts.

    2010 Audi A6 Dual IC's
    Reply With Quote  
     

Similar Threads

  1. Replies: 2
    Last Post: 10-23-2018, 08:09 PM
  2. Injector flow rate OR Cylinder gain?
    By BrandonHall10 in forum PCM Tuning
    Replies: 31
    Last Post: 02-05-2015, 12:45 PM
  3. From misfire at cylinder 3 to a open circuit on the fuel injecter at cylinder 5
    By bbfanatic23 in forum 3.8L V6 Supercharged (L67)(L32)
    Replies: 0
    Last Post: 05-01-2010, 07:49 PM
  4. Cylinder #1 misfire and random cylinder misfire
    By whodat79 in forum 3.8L V6 Supercharged (L67)(L32)
    Replies: 8
    Last Post: 04-21-2010, 07:16 AM
  5. Coding cylinder 3 missfire and cylinder 3 injector port open
    By MATHEWSMAN1969 in forum 3.8L V6 Supercharged (L67)(L32)
    Replies: 2
    Last Post: 04-20-2010, 04:27 PM
Tags for this Thread

View Tag Cloud

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
  •