Thread: Misfires!! Urghh

Results 1 to 10 of 10
  1. #1 Misfires!! Urghh 
    GTP Level Member
    Join Date
    Jun 2016
    Location
    Cleveland ohio
    Posts
    890
    Thanks (Received)
    1
    Likes (Received)
    9
    Dislikes (Received)
    0
    I am chasing a random misfire that is not setting codes. I have swapped out the ICM, coils, plugs and wires all separately to try to eliminate the issue. I have tried multiple case learns. I have a newer Maf that is clean and reading correctly. What am I looking at next? ECM?
    2017 Buick Regal 2.0 Turbo (SOLD 2007 Grand Prix GT. Front and rear PLOGs, 1.8 roller rockers, CAI, HPTuned, 3.4 pulley, TEP transmission, 90# springs, rollmaster single chain, Impala front brakes d/s rotors.) Past (Pontiacs) Grand Prix- 97 GT, 03 GT, 04 GT, 04 Comp G, 78 Trans am, 92 Trans Am.
    Reply With Quote  
     

  2. #2 Re: Misfires!! Urghh 
    SE Level Member wickedfrisone's Avatar
    Join Date
    Jun 2018
    Location
    New England
    Posts
    137
    Thanks (Received)
    0
    Likes (Received)
    2
    Dislikes (Received)
    0
    How bad is it? Is your converter new or the original? (looking at probability that it's getting clogged and not working at its best)
    2004 Grand Prix GTP Comp G, aka Pumpkin
    Reply With Quote  
     

  3. #3 Re: Misfires!! Urghh 
    GTP Level Member
    Join Date
    Jun 2016
    Location
    Cleveland ohio
    Posts
    890
    Thanks (Received)
    1
    Likes (Received)
    9
    Dislikes (Received)
    0
    Thanks. I have a hollow converter. The misfires are strong enough to really bog down on hard acceleration.

    I don’t think it’s the injectors. They are AC Delco OE that has less than 30k on them. I also run Shell v power 93 octane with archoil fuel additive.
    Reply With Quote  
     

  4. #4 Re: Misfires!! Urghh 
    Donating Users bandook's Avatar
    Join Date
    Apr 2015
    Location
    Columbus, OH
    Posts
    1,781
    Thanks (Received)
    2
    Likes (Received)
    27
    Dislikes (Received)
    0
    Are you seeing more misfires on one cylinder? Maybe it's another bad icm? Have you tested the spark with a test light? Do you see anything weird in the scans when it acts up? I'd take a look if you posted it. Do you have to crank for awhile when the car sits?
    Top Swapped 01 Imp
    VS (very small?) cam, SD Headers, 2.8" pulley, 29°, ported everything, E85, AEM water/meth, Deka 60's, HPT tuned
    Reply With Quote  
     

  5. #5 Re: Misfires!! Urghh 
    Killa Bee Scottydoggs's Avatar
    Join Date
    Aug 2010
    Location
    new jersey
    Posts
    39,919
    Thanks (Received)
    63
    Likes (Received)
    166
    Dislikes (Received)
    5
    could be kr too. you scanning anything? knock, timing advance?

    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  
     

  6. #6 Re: Misfires!! Urghh 
    GTP Level Member
    Join Date
    Jun 2016
    Location
    Cleveland ohio
    Posts
    890
    Thanks (Received)
    1
    Likes (Received)
    9
    Dislikes (Received)
    0
    It will also stall out because of this issue. Seems usually at turns?????

    Bandook- it misfires on random cylinder and usually all of them. I have tested spark but can’t when it is acting up because it mostly does while driving. My HPTuners won’t log misfires so I can’t see those on a scan. I will scan it and post the results here. The car starts right up at all times.

    Scottydogs- I have not seen any significant knock during all this. I am going to get a scan on it soon.
    Reply With Quote  
     

  7. #7 Re: Misfires!! Urghh 
    GTP Level Member
    Join Date
    Jun 2016
    Location
    Cleveland ohio
    Posts
    890
    Thanks (Received)
    1
    Likes (Received)
    9
    Dislikes (Received)
    0
    How in the hell do I upload the file here?

    Scottydogs, I did have some KR in this scan.

    HPtuners sucks. I can not log misfires and it freezes often. Their support is worthless.
    2017 Buick Regal 2.0 Turbo (SOLD 2007 Grand Prix GT. Front and rear PLOGs, 1.8 roller rockers, CAI, HPTuned, 3.4 pulley, TEP transmission, 90# springs, rollmaster single chain, Impala front brakes d/s rotors.) Past (Pontiacs) Grand Prix- 97 GT, 03 GT, 04 GT, 04 Comp G, 78 Trans am, 92 Trans Am.
    Reply With Quote  
     

  8. #8 Re: Misfires!! Urghh 
    Killa Bee Scottydoggs's Avatar
    Join Date
    Aug 2010
    Location
    new jersey
    Posts
    39,919
    Thanks (Received)
    63
    Likes (Received)
    166
    Dislikes (Received)
    5
    pretty sure icman set it up to load hpt files, not sure about the scans tho. drop box works too.

    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  
     

  9. #9 Re: Misfires!! Urghh 
    GTP Level Member
    Join Date
    Jun 2016
    Location
    Cleveland ohio
    Posts
    890
    Thanks (Received)
    1
    Likes (Received)
    9
    Dislikes (Received)
    0
    2017 Buick Regal 2.0 Turbo (SOLD 2007 Grand Prix GT. Front and rear PLOGs, 1.8 roller rockers, CAI, HPTuned, 3.4 pulley, TEP transmission, 90# springs, rollmaster single chain, Impala front brakes d/s rotors.) Past (Pontiacs) Grand Prix- 97 GT, 03 GT, 04 GT, 04 Comp G, 78 Trans am, 92 Trans Am.
    Reply With Quote  
     

  10. #10 Re: Misfires!! Urghh 
    Donating Users bandook's Avatar
    Join Date
    Apr 2015
    Location
    Columbus, OH
    Posts
    1,781
    Thanks (Received)
    2
    Likes (Received)
    27
    Dislikes (Received)
    0
    Did this just start happening? Or have you made tune changes? I don't know the 07 pcm, but first thing I noticed is how high your timing is under part throttle. Also, do you live around a lot of hills? I mean, I kinda know cleveland. Didn't think it was hilly. I'm gonna have to download a stock tune to get familiar. If you want to post your tune that would be cool. Obviously, if it was fine on the same tune, then that's not it. Maybe this year is just that much different than what i'm used to.

    I'd probably start by looking for vacuum leaks. Your trims are pretty high. if it was spark related, you would have negative trims, right? You are getting knock on decel too, which i think i've had when i had a big vac leak. Just spitballin', so take it for what it's worth.

    Also are you using a wideband? Self tuned/dyno/canned?
    Top Swapped 01 Imp
    VS (very small?) cam, SD Headers, 2.8" pulley, 29°, ported everything, E85, AEM water/meth, Deka 60's, HPT tuned
    Reply With Quote  
     

Similar Threads

  1. Misfires and multiple misfires
    By BigBadjohn in forum 3.8L V6 Supercharged (L67)(L32)
    Replies: 2
    Last Post: 03-06-2017, 06:32 PM
  2. Misfires?
    By Ultra440 in forum 3.8L V6 Supercharged (L67)(L32)
    Replies: 6
    Last Post: 10-27-2012, 03:45 PM
  3. car misfires
    By backinblackgtp in forum Engine
    Replies: 6
    Last Post: 03-24-2011, 03:25 PM
  4. Misfires in Cyl 4
    By mousemonster1232 in forum 3.8L V6 Supercharged (L67)(L32)
    Replies: 11
    Last Post: 03-09-2011, 02:38 PM
  5. misfires??
    By paulaxe in forum Engine
    Replies: 1
    Last Post: 11-23-2010, 04:09 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
  •