Page 1 of 2 12 LastLast
Results 1 to 10 of 13

Thread: LOG - Stock 1.4t Cruze KNOCKING horribly on 93 octane

  1. #1
    Lifetime Member Boost's Avatar
    Join Date
    Dec 2006
    Posts
    1,468

    Default LOG - Stock 1.4t Cruze KNOCKING horribly on 93 octane

    In this log, I was driving my stock Cruze 1.4t with a tank full of 93 octane Mobil premium fuel. This car is very low mileage and automatic. I had such horrible audible pinging with over 12 degrees of KR at part throttle low RPM, that I suspect the fuel quality was absolutely horrible. It also happened right after many minutes stuck in traffic so it got a very good opportunity to heat soak the IC, in 85 degree afternoon temps. Please look and comment if you can.

    cruze knock.efi
    Last edited by Boost; March 19th, 2012 at 03:55 PM.
    - Roland
    GM dealer tech since 2005
    '01 Z28 LS1/T56
    t-tops :usa:
    stock 241 heads, stock cam,
    stock muffler, factory wheels

    8.2 @ 86
    (1/8th mile with 255 Toyo Proxes)
    I am learning...

  2. #2
    Lifetime Member Boost's Avatar
    Join Date
    Dec 2006
    Posts
    1,468

    Default

    Click image for larger version. 

Name:	Cruze Knock Chart.png 
Views:	250 
Size:	77.8 KB 
ID:	12800Click image for larger version. 

Name:	Cruze Knock Data.png 
Views:	254 
Size:	73.9 KB 
ID:	12801

    You can see that around frame 2722 the horror starts. What gives? :(
    - Roland
    GM dealer tech since 2005
    '01 Z28 LS1/T56
    t-tops :usa:
    stock 241 heads, stock cam,
    stock muffler, factory wheels

    8.2 @ 86
    (1/8th mile with 255 Toyo Proxes)
    I am learning...

  3. #3
    Forum tyhee Site Admin GMPX's Avatar
    Join Date
    Apr 2003
    Posts
    12,767

    Default

    12 degrees, you win, we thought what we were seeing on the E39 logs was bad.
    Have you tried reading the TCM? Should be a T76.
    Need official EFILive help, please go here.
    For tuning support please post your questions on this forum (or other auto forums).
    Sorry if I don't respond to your PM, don't take it personal.


  4. #4
    Lifetime Member Boost's Avatar
    Join Date
    Dec 2006
    Posts
    1,468

    Default

    Quote Originally Posted by GMPX View Post
    12 degrees, you win, we thought what we were seeing on the E39 logs was bad.
    Have you tried reading the TCM? Should be a T76.
    :( :( yeah, it sounded very bad. The car is bone stock!!! I will try to read the T76, if the process can't hurt anything, it's a daily driver. I guess it had to be bad fuel??
    - Roland
    GM dealer tech since 2005
    '01 Z28 LS1/T56
    t-tops :usa:
    stock 241 heads, stock cam,
    stock muffler, factory wheels

    8.2 @ 86
    (1/8th mile with 255 Toyo Proxes)
    I am learning...

  5. #5
    Junior Member
    Join Date
    Nov 2011
    Posts
    10

    Default

    I've had audible knock on my 1.4T Sonic before, but only with really crappy gas.

  6. #6
    Forum tyhee Site Admin GMPX's Avatar
    Join Date
    Apr 2003
    Posts
    12,767

    Default

    I'm currently running E10 in our Cruze, I've yet to see over 1 degree of knock! However, I have removed around 3 degrees of timing from the stock tune and the air here at the moment is quite cold. Can't wait to get it running on E85, all the bits should be here next week to convert it over.

    If you look at the log below (with E10 fuel), although it was just an easy drive to the shops, there was zero knock, that is pretty rare on a Cruze, more so when they are stock.

    Last edited by GMPX; June 9th, 2012 at 08:05 PM.
    Need official EFILive help, please go here.
    For tuning support please post your questions on this forum (or other auto forums).
    Sorry if I don't respond to your PM, don't take it personal.


  7. #7
    Lifetime Member Boost's Avatar
    Join Date
    Dec 2006
    Posts
    1,468

    Default

    Nice! Is E10 10% ethanol and 90% gasoline? In that case that is almost like what I was running. (All our gas stations here are "up to 10% ethanol). Another note, on my performance tunes I see very little knock also. This was bone stock and since I have also switched to Chevron which I think is the best fuel we have here. Many say the Mobil 93 I was running before is low quality. Although there are varying opinions about fuel quality, and some think it's all the same. I married a gas station expert that begs to differ. So far, no trouble with Chevron 93.

    Thanks for sharing mate! Are those the PIDs you usually monitor on yours?
    - Roland
    GM dealer tech since 2005
    '01 Z28 LS1/T56
    t-tops :usa:
    stock 241 heads, stock cam,
    stock muffler, factory wheels

    8.2 @ 86
    (1/8th mile with 255 Toyo Proxes)
    I am learning...

  8. #8
    Forum tyhee Site Admin GMPX's Avatar
    Join Date
    Apr 2003
    Posts
    12,767

    Default

    The PID's I have been working on, they are new ones we've been adding in.
    Need official EFILive help, please go here.
    For tuning support please post your questions on this forum (or other auto forums).
    Sorry if I don't respond to your PM, don't take it personal.


  9. #9
    Lifetime Member Boost's Avatar
    Join Date
    Dec 2006
    Posts
    1,468

    Default

    Sweet!!!
    - Roland
    GM dealer tech since 2005
    '01 Z28 LS1/T56
    t-tops :usa:
    stock 241 heads, stock cam,
    stock muffler, factory wheels

    8.2 @ 86
    (1/8th mile with 255 Toyo Proxes)
    I am learning...

  10. #10
    Junior Member
    Join Date
    Jan 2011
    Posts
    39

    Default

    90F day today, 120F intake air temps logged, zero degrees knock retard The joys of methanol/water injection!
    This is the stock calibration, but I have a larger turbo installed so a bit higher boost at the top end then you would normally see.

    Click image for larger version. 

Name:	meth_water  injection.jpg 
Views:	177 
Size:	340.9 KB 
ID:	13442

Page 1 of 2 12 LastLast

Similar Threads

  1. 2012 5.3 silverado knocking with stock tune
    By TravRMK in forum Gen IV V8 Specific
    Replies: 11
    Last Post: February 15th, 2012, 06:21 AM
  2. Cruze questions (1.4 trans and 1.8 tune)
    By Boost in forum E78, E83, E84 PFI ECM's
    Replies: 2
    Last Post: August 17th, 2011, 03:21 AM
  3. turbo Cruze first thoughts
    By Boost in forum E78, E83, E84 PFI ECM's
    Replies: 22
    Last Post: August 16th, 2011, 12:50 PM
  4. have a look at my knocking log
    By pauly24 in forum General (Petrol, Gas, Ethanol)
    Replies: 4
    Last Post: July 13th, 2010, 11:32 AM
  5. Replies: 2
    Last Post: August 7th, 2005, 02:04 PM

Posting Permissions

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