Help with engine bog ?? - 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
User Name
Password
lost password?   |   register now

Reply
 
LinkBack Thread Tools
  #1 (permalink)  
Old 02-25-2012, 12:25 PM
Registered User
 
Last photo:
Join Date: Oct 2011
Location: macon ga
Posts: 47
Wiki Edits: 0

Thanks: 0
Thanked 1 Time in 1 Post
Help with engine bog ??

My son just bought a 1995 z71 4x4 truck with a 350 engine with a 2 barrel Throttle body injection.. The truck runs good . The problem is if you barely press the gas pedel ,its starts to bog down ,and runs rough , but if you just press it , it drives fine . I dont have a way to check the fuel presure, but was wondering if it could be the fuel pump . any help would be great.. thanks..

    Advertisement
Reply With Quote Quick reply to this message
Sponsored Links
Advertisement
 
  #2 (permalink)  
Old 02-25-2012, 03:52 PM
Registered User
 
Last photo:
Join Date: Oct 2011
Location: macon ga
Posts: 47
Wiki Edits: 0

Thanks: 0
Thanked 1 Time in 1 Post
..........
Reply With Quote Quick reply to this message
  #3 (permalink)  
Old 02-25-2012, 10:02 PM
Registered User
 
Last photo:
Join Date: Oct 2011
Location: macon ga
Posts: 47
Wiki Edits: 0

Thanks: 0
Thanked 1 Time in 1 Post
anybody !!!!!
Reply With Quote Quick reply to this message
  #4 (permalink)  
Old 02-25-2012, 10:19 PM
Registered User
 
Join Date: Oct 2011
Location: Mo
Posts: 148
Wiki Edits: 0

Thanks: 0
Thanked 6 Times in 6 Posts
It's not the fuel pump, you need to see if it's throwing any codes with a scanner. Just a thought, on a 94 you can check for codes with a paper clip, not sure about a 95.
Reply With Quote Quick reply to this message
  #5 (permalink)  
Old 02-26-2012, 10:13 AM
Registered User
 
Last photo:
Join Date: Oct 2011
Location: macon ga
Posts: 47
Wiki Edits: 0

Thanks: 0
Thanked 1 Time in 1 Post
[QUOTE=hpete]It's not the fuel pump, you need to see if it's throwing any codes with a scanner. Just a thought, on a 94 you can check for codes with a paper clip, not sure about a 95.[/Q , I went and got a book on it today, and i believe that the check engine light bulb has been removed or something cause it should be on when it acts up.. thanks for the reply..
Reply With Quote Quick reply to this message
  #6 (permalink)  
Old 02-26-2012, 01:34 PM
T-bucket23's Avatar
Hotrodders.com Moderator
 
Last wiki edit: Engine basic condition - how to check Last photo:
Join Date: Aug 2005
Location: Massachusetts
Age: 57
Posts: 5,204
Wiki Edits: 26

Thanks: 7
Thanked 116 Times in 101 Posts
Did this just start all at once, what have you done to it so far if anything. The more information you hive the more and better quality responses you will get.

I would look for vacuum leaks and see if the TPS resistance change is smooth when you move the throttle as a start.
__________________
Artificial Intelligence is no match for Natural Stupidity



Chet
Reply With Quote Quick reply to this message
  #7 (permalink)  
Old 02-26-2012, 08:07 PM
Registered User
 
Last photo:
Join Date: Oct 2011
Location: macon ga
Posts: 47
Wiki Edits: 0

Thanks: 0
Thanked 1 Time in 1 Post
Quote:
Originally Posted by T-bucket23
Did this just start all at once, what have you done to it so far if anything. The more information you hive the more and better quality responses you will get.

I would look for vacuum leaks and see if the TPS resistance change is smooth when you move the throttle as a start.
my son just bought the truck last weekend and he said it did it at the time he test drove it , and thought it might be the gas filter so after he bought it he changed it but it stills bogs when you barely start off. with truck in park ,and idleing , i can move the throttle at the throttle body just a little and it bogs and stumbles bad,but if i just rev it , it does fine.. Im going to ck for vacum leaks tomorrow and use a jumper wire to ck for any codes.
Reply With Quote Quick reply to this message
  #8 (permalink)  
Old 02-28-2012, 08:10 PM
F-BIRD'88's Avatar
Yada Yada Yada
 
Last photo:
Join Date: Oct 2005
Location: Ontario, Canada
Posts: 9,153
Wiki Edits: 0

Thanks: 5
Thanked 380 Times in 374 Posts
Check the TPS sensor voltage sweep. Check the mounting position of the TPS.
Reply With Quote Quick reply to this message
  #9 (permalink)  
Old 02-28-2012, 09:44 PM
Registered User
 
Last photo:
Join Date: Oct 2011
Location: macon ga
Posts: 47
Wiki Edits: 0

Thanks: 0
Thanked 1 Time in 1 Post
there was no codes stored , and i checked for vacum leaks and didnt find any. was wondering maybe if it might still be the fuel pump.. any suggestions ? thanks
Reply With Quote Quick reply to this message
  #10 (permalink)  
Old 02-28-2012, 09:46 PM
Registered User
 
Last photo:
Join Date: Oct 2011
Location: macon ga
Posts: 47
Wiki Edits: 0

Thanks: 0
Thanked 1 Time in 1 Post
Quote:
Originally Posted by F-BIRD'88
Check the TPS sensor voltage sweep. Check the mounting position of the TPS.
not sure what you mean, and how would i ? thanks
Reply With Quote Quick reply to this message
  #11 (permalink)  
Old 02-28-2012, 10:28 PM
F-BIRD'88's Avatar
Yada Yada Yada
 
Last photo:
Join Date: Oct 2005
Location: Ontario, Canada
Posts: 9,153
Wiki Edits: 0

Thanks: 5
Thanked 380 Times in 374 Posts
Quote:
Originally Posted by robbie43
not sure what you mean, and how would i ? thanks
get some one to show you. Its a simple test using a volt ohm meter to read the TPS sensor output when sweeping from idle to WOT.
a bad sensor will not have a smooth progressive voltage sweep.
The sensor voltage output must be correct at idle. ( mounting reset postition)

you can read the voltage output or disconnect and read the resistance (Ohms)
its basicly a rheostat. like a volume control or rotary light dimmer.
A service manual will tell you the voltages require at idle and WOT.

when one wears out, it does not read smooth as it sweeps off idle.
a jumpy sweep or dead spots='s replace
Reply With Quote Quick reply to this message
  #12 (permalink)  
Old 02-29-2012, 01:22 AM
Registered User
 
Join Date: Apr 2011
Location: Atx
Age: 41
Posts: 13
Wiki Edits: 0

Thanks: 0
Thanked 0 Times in 0 Posts
Throttle body

Its possible that you have a dirt ring inside the throttle body.Buy some B-12 fuel injection spray cleaner..Spray into the Throttle body and rev at the same time.You should be ok after that...
Reply With Quote Quick reply to this message

Recent Engine 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
350 Crate Engine: Loud humming sound after engine warms up sofa1515 Engine 2 01-11-2010 06:48 PM
Engine Help. Engine Turns over Hard, like siezed yet runs awsome. Merle9069 Engine 3 10-05-2008 06:38 PM
I need engine mount bracket ideas 1930 chevy with 302 boss engine. Riley Engine 3 07-25-2008 07:29 AM
say you have a THOUSAND horsepower engine..... (technical engine question inside) lowROLLERchevy Engine 14 02-24-2007 08:26 AM
the best engine parts, chain vs. gear, engine combos jollygiant_57 Engine 6 05-01-2002 09:34 AM


All times are GMT -6. The time now is 09:18 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.