Page 1 of 3 123 LastLast
Results 1 to 20 of 52

Sputtering

This is a discussion on Sputtering within the General Help forums, part of the LSx Technical Help Section category; Alright guys, I am having problems with my car again. I beleave it's the same problem I have had since ...

  1. #1
    Member SS201's Avatar
    Join Date
    Apr 2009
    Location
    SW KANSAS
    Age
    34
    Posts
    146

    Pewter
    2002 Chevy Camaro SS

    Sputtering

    Alright guys,
    I am having problems with my car again. I beleave it's the same problem I have had since last year. Last year I had to change my fuel pump becasue I was having a sputtering problem during heavy accelaration or cold starts, it even stalled on me a few times during a stop at a red light. I changed the fuel pump and it quit for a while. A year later, almost to the day, it starts to sputter again during heavy accelaration or cold starts. My car is now showing a Service Engine soon light, when hooked up to a code reader it shows: Lean bank 2. It showed the same code last year. Last year I even changed the O2 sensors. This year I already changed the fuel pump again but still it sputters, not as bad as it did before the pump change but it still does.

    What is the diagnosis for my car. What else could be giving me that same problem?

    A little history for my car, it has a Texas Speed Ms3 cam (going on 15K miles), LS6 GM Air intake, 2nd - 4th gear clutch pack, A4, 3600 Stall. Before the cam it was ran with Nitrous during a few drags and fuel pump of course. Everything else is stock.

  2. #2
    Member Jay37's Avatar
    Join Date
    Nov 2010
    Location
    St Marys GA
    Posts
    238

    Black
    '05 GTO

    What is your fuel pressure at the rail?

  3. #3
    Super Moderator
    pajeff02's Avatar
    Join Date
    Feb 2009
    Location
    Mansfield, PA
    Posts
    21,576

    Black & Blue
    '02 WS.6 / '07 Suburban

    When was the fuel filter last changed?

  4. #4
    Moderator Cutlass's Avatar
    Join Date
    Apr 2008
    Location
    Madison, WI
    Posts
    6,998

    1999 Formula WS6 M6-sold
    2001 Silverado Z71

    A lean code can set from a vacuum leak, dirty/clogged/partially clogged injectors, bad MAF sensor, or low fuel pressure among other things.

  5. #5
    Member SS201's Avatar
    Join Date
    Apr 2009
    Location
    SW KANSAS
    Age
    34
    Posts
    146

    Pewter
    2002 Chevy Camaro SS

    Well I am going to get my fuel pressue reading this monday or sunday on my days off. I changed teh fuel filter when I changed the fuel pump just to make sure.
    I had the MAF sensor checked last year and it worked ok. I changed it out with my friends (LS1 T/A).

    What's the best way to check my injectors and vaccum?

  6. #6
    Super Moderator
    pajeff02's Avatar
    Join Date
    Feb 2009
    Location
    Mansfield, PA
    Posts
    21,576

    Black & Blue
    '02 WS.6 / '07 Suburban

    Carefully inspect the all the vacuum hoses for breaks. You will want to pay particular attention to the PCV assembly. The connection on the side of the throttle body and the union at the back of the passenger side head seem to be the most failure prone points. There is also a collection of small hoses back by the PCM.


    Nominal fuel pressure is 58 p.s.i., but it can range anywhere from 55 - 61 p.s.i. or so and be ok. Make sure pressure is checked across the operating range as it may appear ok at idle, but under demand you could have a fuel volume issue. If you can get a scanner on the car, check your fuel trims and see where they are at. You should find Bank 1 (driver side) and Bank 2 (passenger side) short term fuel trims (STFT) and long term fuel trims (LTFT). You want these to be close to zero, maybe plus or minus 3 or so at the most. A skewed fuel trim will confirm an issue.

    Let us know what you find.

  7. #7
    Member jamessr's Avatar
    Join Date
    Jan 2007
    Location
    Newport News, VA
    Posts
    266

    White
    2000 Trans AM

    clogged cats

  8. #8
    Member Jay37's Avatar
    Join Date
    Nov 2010
    Location
    St Marys GA
    Posts
    238

    Black
    '05 GTO

    one way to check for a vacuum leak is put gasoline in a spray bottle and lightly spray any area that could be suspect to a leak, and if it is leaking you will have a rpm change, simple but effective.

  9. #9
    Moderator Cutlass's Avatar
    Join Date
    Apr 2008
    Location
    Madison, WI
    Posts
    6,998

    1999 Formula WS6 M6-sold
    2001 Silverado Z71

    Quote Originally Posted by Jay37 View Post
    one way to check for a vacuum leak is put gasoline in a spray bottle and lightly spray any area that could be suspect to a leak, and if it is leaking you will have a rpm change, simple but effective.
    That seems extremely dangerous. I prefer to use carb or throttle body cleaner

  10. #10
    Super Moderator
    pajeff02's Avatar
    Join Date
    Feb 2009
    Location
    Mansfield, PA
    Posts
    21,576

    Black & Blue
    '02 WS.6 / '07 Suburban

    Quote Originally Posted by Cutlass View Post
    That seems extremely dangerous. I prefer to use carb or throttle body cleaner

    Agree. I would never use gasoline.

  11. #11
    Member SS201's Avatar
    Join Date
    Apr 2009
    Location
    SW KANSAS
    Age
    34
    Posts
    146

    Pewter
    2002 Chevy Camaro SS

    Quote Originally Posted by Cutlass View Post
    That seems extremely dangerous. I prefer to use carb or throttle body cleaner
    Ok I see, that seems pretty simple actually.

  12. #12
    Member Jay37's Avatar
    Join Date
    Nov 2010
    Location
    St Marys GA
    Posts
    238

    Black
    '05 GTO

    Hope your not a smoker.

  13. #13
    Veteran 0rion's Avatar
    Join Date
    Aug 2005
    Location
    ohio
    Posts
    22,520

    98 Formula
    06 duramax

    Quote Originally Posted by Cutlass View Post
    That seems extremely dangerous. I prefer to use carb or throttle body cleaner
    Quote Originally Posted by pajeff02 View Post
    Agree. I would never use gasoline.
    propane works well too and is fairly safe

  14. #14
    Veteran 0rion's Avatar
    Join Date
    Aug 2005
    Location
    ohio
    Posts
    22,520

    98 Formula
    06 duramax

    check everything these guys have told you and if your fuel pressure is low it could possibly just be a crack in the hose going to the pump.....that's no uncommon on the 99+ cars. They will also blow that venturi hose off. Did you cut the bucket or use a racetronix set up? and do you run the car down to empty on a regular basis?

  15. #15
    Super Moderator
    pajeff02's Avatar
    Join Date
    Feb 2009
    Location
    Mansfield, PA
    Posts
    21,576

    Black & Blue
    '02 WS.6 / '07 Suburban

    Quote Originally Posted by 0rion View Post
    propane works well too and is fairly safe

    I have used that as well trying to track down a wandering idle on our Corvette.

  16. #16
    Member SS201's Avatar
    Join Date
    Apr 2009
    Location
    SW KANSAS
    Age
    34
    Posts
    146

    Pewter
    2002 Chevy Camaro SS

    Quote Originally Posted by 0rion View Post
    check everything these guys have told you and if your fuel pressure is low it could possibly just be a crack in the hose going to the pump.....that's no uncommon on the 99+ cars. They will also blow that venturi hose off. Did you cut the bucket or use a racetronix set up? and do you run the car down to empty on a regular basis?
    Ok I checked the fuel pressure at the rail, it is stable at 58 psi even during hi revs (on park). I also sprayed carb cleaner around the air intake manifold and fuel rails including each fuel injector and did not have any change in idle. All the hoses appear to be ok not cracked and intact. I just chaged my fuel pump to a new walbro 255 lph pump. The way it was installed the previous owner had cut the bucket. i just reinstalled it the same way, quick disconnect and connect. I have not had but a few hundred miles on this new pump, going about a month with it actually. I have not let the fuel tank go less than half since I have had this new pump. It appears that the sputtering is worse when the engine is cold. Once it warms up to operating temp it almost doesn't do it. I did however have to replace a valve cover gasket about two months ago on the passenger side, the side that gives me the lean code. Could that be something to take into consideration with this problem?

    I read a post somewhere on this forum about valve cover breathers, could that help any? Also a oil catch can? Could that be giving me a lean code or somme kind of timing retard?

  17. #17
    Member SS201's Avatar
    Join Date
    Apr 2009
    Location
    SW KANSAS
    Age
    34
    Posts
    146

    Pewter
    2002 Chevy Camaro SS

    bump

  18. #18
    ʢ ൧ ൨ ൩ ൪ ൫ ൬ ൭ ൮Ր Ց Ւ Փ Smittro's Avatar
    Join Date
    Feb 2009
    Location
    Pittsburgh
    Posts
    9,965

    White
    2008 Hummer H3

    I did'nt see any mention of a tune in the list of mods..
    :\Users\Steven\Pictures\d6ftg5nh.gif


    Suggestion: If you are particularly irritated by another member's posting habits and are constantly fighting the urge to flame them, you can click on that person's profile, and select "Add to ignore list." This will make that person's posts invisible to you.

  19. #19
    Senior Member Danger731's Avatar
    Join Date
    Aug 2000
    Location
    Indy
    Posts
    6,712
    don't forget bad gas....
    04 C5 A4 Torch Red

    2009 CTS4 Ice Black

    2013 1500 Silverado Z71

    02 Z/28 M6 Onyx Black All Options - Sold

  20. #20
    Member SS201's Avatar
    Join Date
    Apr 2009
    Location
    SW KANSAS
    Age
    34
    Posts
    146

    Pewter
    2002 Chevy Camaro SS

    Well of course it does have a tune, LS1 tuner i think LS1 edit. I have been using it dayly still as mild as possible. I have gone through about 4 full tanks of fuel ( without going past half tank). Sputters during cold start mainly, once it warms up it goes back to regular running. On full throtle sometimes it will sputter.

    A local guy told me to change the spark plugs to NGK TR5 b/c the NGK TR6 are too cold and could be making a difference.
    2002 Camaro SS, Hooker Exhaust, Pacesetter Headers, Drag Dump, TSP Magic Stick 4, Comp Cams valve train, GM LS6 Intake Manifold, High Volume Fuel Pump, MTI Intake, K&N Air Filter, 3600 Stall, sub-frame connectors... still working on new wheels
    -FRANK

Page 1 of 3 123 LastLast

Thread Information

Users Browsing this Thread

There are currently 1 users browsing this thread. (0 members and 1 guests)

Similar Threads

  1. Help: Sputtering when i let off the gas
    By TIMBO0566 in forum GTO
    Replies: 17
    Last Post: 05-06-2008, 02:54 AM
  2. Sputtering at low rpm
    By richard head in forum General Help
    Replies: 2
    Last Post: 11-28-2007, 10:09 AM
  3. sputtering
    By dafizzman1 in forum General Help
    Replies: 6
    Last Post: 08-01-2007, 05:53 PM
  4. Sputtering...
    By 01RaptorTA in forum Computer & Tuning
    Replies: 57
    Last Post: 07-22-2007, 03:22 PM
  5. sputtering
    By 99PTA in forum GM Trucks
    Replies: 4
    Last Post: 07-20-2007, 01:26 AM

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
  •