2007 silverado misfire (no codes) - Hot Rod Forum : Hotrodders Bulletin Board
Hotrodders.com -- Hot Rod Forum



Register FAQ Search Today's Posts Unanswered Posts Auto Escrow Insurance Auto Loans
Hot Rod Forum : Hotrodders Bulletin Board > Tech Help> Engine> Modern Electronic Engines
User Name
Password
lost password?   |   register now

Reply
 
LinkBack Thread Tools
  #1 (permalink)  
Old 12-24-2011, 06:54 AM
Registered User
 
Last photo:
Join Date: Aug 2006
Location: Kamloops B.C. Canada
Posts: 94
Wiki Edits: 0

Thanks: 0
Thanked 0 Times in 0 Posts
2007 silverado misfire (no codes)

Hello all,

I have a 2007 (classic) siverado with a 4.3L and 57,000 km. I just finnished installing an amp for a 12inch sub and notice under heavy bass the head lights dimmed a dit, this is understandable as its a heavy load. So I reved the engine a bit (1800rpm) to help out the system with charging. then the check engine light started flashing. turned off the engine and back on, light was off. did the same thing, only the volume a little lower and no RPM and the light started flashing again, then when off in about 1 minute. took it for a 10km drive, stoped, accelerated, engine off/on, highway speeds, everything seems fine. ODB2 scaner shows no codes. Aslo, had to disconect the battery to hook up the amp and all this happen right after. (everything is tight on the batt.)

any ideas?

was thinking:
-'low voltage' problem.
-old spark plugs.
-bad grounds.
-bad battery

thanx for any help

    Advertisement
Reply With Quote Quick reply to this message
Sponsored Links
Advertisement
 
  #2 (permalink)  
Old 12-24-2011, 08:41 AM
sbchevfreak's Avatar
Licenced Automotive Technician
 
Last photo:
Join Date: Feb 2004
Location: Land of big Easter eggs, Alberta
Age: 34
Posts: 1,607
Wiki Edits: 0

Thanks: 10
Thanked 9 Times in 9 Posts
Low voltage, or possibly spikes due to the heavy draw. If the headlamps are pulsing in this truck, you need to add a capacitor into the amp circuit to fix this.
Reply With Quote Quick reply to this message
  #3 (permalink)  
Old 12-24-2011, 10:13 AM
Augusto's Avatar
From the middle of the world
 
Last wiki edit: How to rebuild an engine Last photo:
Join Date: Mar 2006
Location: Ecuador, South America
Age: 51
Posts: 1,312
Wiki Edits: 6

Thanks: 4
Thanked 2 Times in 2 Posts
you must take the juice directly from the bat and install one of those big capacitors. they will fix your problem and will add some looks to your audio system.
Reply With Quote Quick reply to this message
  #4 (permalink)  
Old 12-24-2011, 10:35 AM
Blazin72's Avatar
You got a leaky spark tube...
 
Last wiki edit: Rearend removal
Last journal entry: General Lee
Last photo:
Join Date: Jul 2005
Location: Union, WA
Age: 32
Posts: 2,868
Wiki Edits: 19

Thanks: 0
Thanked 2 Times in 2 Posts
Quote:
Originally Posted by Augusto
... install one of those big capacitors...
I was going to say the same thing. If you don't have a capacitor then install one. If anything, your headlights won't dim whenever the bass hits.
Reply With Quote Quick reply to this message
  #5 (permalink)  
Old 12-24-2011, 02:56 PM
Registered User
 
Last photo:
Join Date: Aug 2006
Location: Kamloops B.C. Canada
Posts: 94
Wiki Edits: 0

Thanks: 0
Thanked 0 Times in 0 Posts
So you all are thinking a low voltage/amperage might be causing this misfire/flashing CEL. Thats kinda what i was thinking too. I have a 4ga wire from the batt. Directly running to the amp, and a 4ga wire running from the frame to the amp (cleaned the paint off and all that). But the factory ground for the truck looks to be a 6ga wire running to the engine block and thats about it. So i was also thinking about doing the 'big 3 update' as well as a cap. Perhaps a new batt may be needed as well.

Anyone know why the misfire didnt toss a code ?? I find this odd.

Thx
Poy.
Reply With Quote Quick reply to this message
  #6 (permalink)  
Old 12-24-2011, 03:00 PM
Blazin72's Avatar
You got a leaky spark tube...
 
Last wiki edit: Rearend removal
Last journal entry: General Lee
Last photo:
Join Date: Jul 2005
Location: Union, WA
Age: 32
Posts: 2,868
Wiki Edits: 19

Thanks: 0
Thanked 2 Times in 2 Posts
Did you take care of installing a capacitor yet? Again, at a minimum it should take care of the dimming headlights on bass hits.
Reply With Quote Quick reply to this message
  #7 (permalink)  
Old 12-24-2011, 03:13 PM
Registered User
 
Last photo:
Join Date: Aug 2006
Location: Kamloops B.C. Canada
Posts: 94
Wiki Edits: 0

Thanks: 0
Thanked 0 Times in 0 Posts
the dimming lights isnt what worries me, i know what thats from, its the CEL is whats gets me.
Reply With Quote Quick reply to this message
  #8 (permalink)  
Old 12-24-2011, 06:10 PM
Siggy_Freud's Avatar
Hotrodders.com Moderator
 
Last photo:
Join Date: Dec 2003
Location: Portland, Oregon
Age: 29
Posts: 2,371
Wiki Edits: 0

Thanks: 0
Thanked 1 Time in 1 Post
Is the problem still occurring? If so, disconnect the audio/amp and see if it goes away. If it does, most likely your audio is pulling enough juice that it's robbing the ignition system.
__________________
Bringing history and technology together.
Reply With Quote Quick reply to this message
  #9 (permalink)  
Old 12-24-2011, 09:24 PM
Registered User
 
Last photo:
Join Date: Aug 2006
Location: Kamloops B.C. Canada
Posts: 94
Wiki Edits: 0

Thanks: 0
Thanked 0 Times in 0 Posts
just went for a 20 min. drive with the amp/deck off and everything was ok. dont know if i really wanna try and make the CEL flash again(misfire), as i hear its hard on the cat(s). think ill try the Big 3 Upgrade and see where i stand then.

also, when a misfire happens like this, should it be coming up more often if it were an other problem (aka sparkpugs, water in fuel, pluged injecter, etc...)?
Reply With Quote Quick reply to this message
  #10 (permalink)  
Old 12-30-2011, 09:27 PM
Registered User
 
Last photo:
Join Date: Aug 2006
Location: Kamloops B.C. Canada
Posts: 94
Wiki Edits: 0

Thanks: 0
Thanked 0 Times in 0 Posts
So i did the 'big 3 upgrade' and there is a difference, got a cap and a yellow top battery. Will post more then there in.
Reply With Quote Quick reply to this message
  #11 (permalink)  
Old 01-01-2012, 03:40 AM
Project89's Avatar
Registered User
 
Last photo:
Join Date: Oct 2011
Location: utah
Posts: 974
Wiki Edits: 0

Thanks: 12
Thanked 33 Times in 30 Posts
a cap is bandaid for the dimming light problem, not saing they dont work, but unles su have a total of 2,500+ watt system there is no need for one.

i see u already did the big 3 upgrades which is what i was going to suggest, if the lights still dim out or u get voltage drops when the bass hits u need a alt with more output.

what ppl fail to realise is a cap needs to be recharged after every bass hit, if the alt is not up to the job to begin with the cap does nothing

on alot of gm stuff ive done the serpintine alts have 2 diff pully sizes on cars that would dim the lights at idle we would put on the smaller pully to speed the alt up to fix the issue at idle, so that could be something u can look into on ur truck as well
Reply With Quote Quick reply to this message
  #12 (permalink)  
Old 01-01-2012, 03:53 AM
Registered User
 
Last photo:
Join Date: Aug 2006
Location: Kamloops B.C. Canada
Posts: 94
Wiki Edits: 0

Thanks: 0
Thanked 0 Times in 0 Posts
When changing pulleys wound you have to change belts too or would the auto tensioner do it?
Reply With Quote Quick reply to this message
  #13 (permalink)  
Old 01-01-2012, 02:34 PM
Project89's Avatar
Registered User
 
Last photo:
Join Date: Oct 2011
Location: utah
Posts: 974
Wiki Edits: 0

Thanks: 12
Thanked 33 Times in 30 Posts
Quote:
Originally Posted by poy41
When changing pulleys wound you have to change belts too or would the auto tensioner do it?
75% of the time the tensioner wil take up the slack since the smaller pulley isnt to much smaller then the large one, worse case is u have to buy a belt that is a half inch shorter
Reply With Quote Quick reply to this message
  #14 (permalink)  
Old 01-17-2012, 12:46 PM
Registered User
 
Last photo:
Join Date: Aug 2006
Location: Kamloops B.C. Canada
Posts: 94
Wiki Edits: 0

Thanks: 0
Thanked 0 Times in 0 Posts
So ive put a yellow top (750 amp) battery in and a cap with a voltage readout. The voltage seems to be a constant 14.5 - 14.7 and the lights are barely dimming now. But last night i drove into town and after coming out of the store and starting up the truck, a "service brake system" light came on. Restarted the truck and everything is fine. It is like -30c here with a wind chill of -42c, dont know if the cold weather would have something to do with it or not. Also rechecked for any codes, found none.
Reply With Quote Quick reply to this message
  #15 (permalink)  
Old 01-17-2012, 02:09 PM
Registered User
 
Last photo:
Join Date: Aug 2006
Location: Kamloops B.C. Canada
Posts: 94
Wiki Edits: 0

Thanks: 0
Thanked 0 Times in 0 Posts
Too add to this, it happened again this morning. Its -36 without the wind. If i cycle thought the key, it will go off. And it hasn't came on while driving yet, only at start up.
Reply With Quote Quick reply to this message

Recent Modern Electronic Engines posts with photos

Quick Reply
Message:
Options

Register Now

In order to be able to post messages on the Hot Rod Forum : Hotrodders Bulletin Board forums, you must first register.
Please enter your desired user name (usually not your first and last name), your email address and other required details in the form below.
User Name:
If you do not want to register, fill this field only and the name will be used as user name for your post.
Password
Please enter a password for your user account. Note that passwords are case-sensitive.
Password:
Confirm Password:
Email Address
Please enter a valid email address for yourself.
Email Address:

Log-in

Human Verification

In order to verify that you are a human and not a spam bot, please enter the answer into the following box below based on the instructions contained in the graphic.




Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
 
Thread Tools

Posting Rules
You may post new threads
You may post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are On


Similar Threads
Thread Thread Starter Forum Replies Last Post
2007 silverado turn signal speden Electrical 2 03-29-2011 04:25 PM
04 5.3 silverado misfire 10Tonhammer Engine 3 10-28-2009 11:51 PM
2007 Chevy Silverado 3500 Dualie Front Brake Rotors Rob Keller Suspension - Brakes - Steering 2 09-12-2008 07:15 PM
2007 Rod & Custom Americruise 2007 pictures posted wp442 Hotrodders' Lounge 2 07-04-2007 12:59 AM
SPY(ish) PICS! 2007? Chevrolet Silverado 1500 ChevelleSS_LS6 Hotrodders' Lounge 8 09-04-2006 02:35 PM


All times are GMT -6. The time now is 08:31 AM.


Powered by vBulletin® Version 3.8.7
Copyright ©2000 - 2014, vBulletin Solutions, Inc.
Search Engine Optimization by vBSEO 3.6.0 PL2
Copyright Hotrodders.com 1999 - 2012. All Rights Reserved.