Ground Trades Xchange - a landscaping forum

Go Back   Ground Trades Xchange - a landscaping forum > Landscape Services > Heavy Equipment
FAQ Search Today's Posts Mark Forums Read



Reply
 
LinkBack Thread Tools
  #1 (permalink)  
Old 10-29-2010, 07:08 PM
Stonehenge's Avatar
Administrator
 
Join Date: Jan 2003
Location: Wisconsin
USDA Zone 4
Posts: 9,092
Stonehenge will become famous soon enough
Diagnosing Truck Problem

I'm trying to figure out why my '93 Chev pickup is running bad. Hoping you can help.

The main symptom? If I give it anything but the lightest amount of throttle, it spits and sputters and feels like it's misfiring.

It had new plugs, new plug wires, new cap and rotor.

Any ideas?
Reply With Quote
  #2 (permalink)  
Old 10-29-2010, 07:19 PM
Gold Oak Member
 
Join Date: Nov 2004
Location: Long Island, NY
USDA Zone 6
Posts: 1,668
GLAN will become famous soon enough
computer ?

Could be giving wrong fuel mixture.....and or the choke
Reply With Quote
  #3 (permalink)  
Old 10-29-2010, 07:39 PM
dan deutekom's Avatar
Moderator
 
Join Date: Apr 2003
USDA Zone 5
Posts: 1,661
dan deutekom will become famous soon enough
Bad injector, vacuum leaks, weak fuel pump or other fuel/air related problems
__________________
Life should NOT be a journey to the grave with the intention of arriving safely in an attractive and well preserved body, but rather to skid in sideways - Beer in one hand - Nacho's in the other - body thoroughly used up, totally worn out and screaming : Woo Hoo, what a ride!



Reply With Quote
  #4 (permalink)  
Old 10-29-2010, 10:07 PM
Terre's Avatar
Whip
 
Join Date: Apr 2007
Location: Denver, Co
USDA Zone 5
Posts: 323
Terre will become famous soon enough
My resident mechanic (he was Master Chevrolet tech before he went to work for me) asks if the check engine light is on. If not, and it sputters under even light throttle, it's either not getting air, or not getting fuel or the air its getting has no place to go.

His first step, is to loosen the exhaust. If this improves the way it runs, you have a clogged catalytic converter.

2nd possibility is failing mass air sensor.
__________________
"Compulsuve nervosa collectorus 'Plantii')
Reply With Quote
  #5 (permalink)  
Old 10-30-2010, 09:29 AM
Stonehenge's Avatar
Administrator
 
Join Date: Jan 2003
Location: Wisconsin
USDA Zone 4
Posts: 9,092
Stonehenge will become famous soon enough
Fantastic! Thanks for the answers. I'll give a try to the suggestions and report back.
Reply With Quote
  #6 (permalink)  
Old 10-30-2010, 12:25 PM
NCSULandscaper's Avatar
B&B Tree
 
Join Date: Sep 2003
USDA Zone 7
Posts: 836
NCSULandscaper will become famous soon enough
i cant remember if early 90's trucks had EGR valves yet, but the symptoms of todays trucks with bad EGR valves are the exact same as what you describe
__________________
Matt Thompson
Thompson's Landscaping
Henderson, NC

NC Registered Landscape Contractor #1862
NC Certified Plant Professional
NC Licensed Pesticide Applicator
NC Certified Nurseryman
Reply With Quote
  #7 (permalink)  
Old 10-30-2010, 07:14 PM
dan deutekom's Avatar
Moderator
 
Join Date: Apr 2003
USDA Zone 5
Posts: 1,661
dan deutekom will become famous soon enough
EGR valves go back to the mid 70's and yes they can cause problems like that but usually it is a misfire at idle that clears up with increasing engine speed.
__________________
Life should NOT be a journey to the grave with the intention of arriving safely in an attractive and well preserved body, but rather to skid in sideways - Beer in one hand - Nacho's in the other - body thoroughly used up, totally worn out and screaming : Woo Hoo, what a ride!



Reply With Quote
  #8 (permalink)  
Old 12-04-2010, 06:14 PM
Stonehenge's Avatar
Administrator
 
Join Date: Jan 2003
Location: Wisconsin
USDA Zone 4
Posts: 9,092
Stonehenge will become famous soon enough
Ok, I have an update -

Loosened exhaust resulted in the same performance.

I replaced the O2 sensor. Nothing changed.

I replaced the injectors. Nothing changed.

A guy at the auto parts place recommended checking the throttle position sensor, but I'm not sure this model truck even has one. Pedal drives cable, cable pulls on lever, gas goes into injection system.

Has anyone taken a vehicle into a place just to be diagnosed but not fixed? I'm considering this.
Reply With Quote
  #9 (permalink)  
Old 12-04-2010, 08:24 PM
Seedling
 
Join Date: May 2009
USDA Zone 5
Posts: 83
mybigdog1 is on a distinguished road
Have you checked the fuel filter??? Start simple
Reply With Quote
  #10 (permalink)  
Old 12-04-2010, 10:26 PM
4seasons's Avatar
Gold Oak Member
 
Join Date: Aug 2005
Location: Millersburg, ohio
USDA Zone 5
Posts: 936
4seasons is on a distinguished road
Imy mechanic has a computer he hooks up to my vehicles and runs tests....cost $75.00
saves a lot of guessing. Plus you decide if its worth fixing then.
Reply With Quote
  #11 (permalink)  
Old 12-05-2010, 01:36 AM
dan deutekom's Avatar
Moderator
 
Join Date: Apr 2003
USDA Zone 5
Posts: 1,661
dan deutekom will become famous soon enough
You can extract trouble codes yourself on pre 1996 trucks without special readers.

Diagnostic Trouble Codes

They are fairly vague but can point you to the right area.
__________________
Life should NOT be a journey to the grave with the intention of arriving safely in an attractive and well preserved body, but rather to skid in sideways - Beer in one hand - Nacho's in the other - body thoroughly used up, totally worn out and screaming : Woo Hoo, what a ride!



Reply With Quote
  #12 (permalink)  
Old 12-06-2010, 12:04 AM
Stonehenge's Avatar
Administrator
 
Join Date: Jan 2003
Location: Wisconsin
USDA Zone 4
Posts: 9,092
Stonehenge will become famous soon enough
I'll give these ideas a try. I hate just throwing money at this, replacing parts and hoping for the best.
Reply With Quote
  #13 (permalink)  
Old 12-06-2010, 01:51 AM
Terre's Avatar
Whip
 
Join Date: Apr 2007
Location: Denver, Co
USDA Zone 5
Posts: 323
Terre will become famous soon enough
Throttle position sensor is definitely a possibility, and is easy to check, on the truck with a voltmeter. It is usually on the opposite side of the throttle shaft that the cable is pulling. Sensor has a 3 wire connector. Disconnect 3 wire connector. With ignition on, 1 wire will have 5 volts, the other a good ground, the 3rd is the reference for the computer. Voltmeter negative hooked to battery ground, identify the 5 volt wire, reconnect the connector, then with engine off but ignition on, hook parallel to the other two wires. At idle, voltage should be below 1 volt as the throttle is opened, voltage should increase smoothly and progressively to close to 5 volts. Especially pay attention to jumpy readings as you increase throttle position, these would indicate a failing sensor.

If you determine this is not the problem, have the mass air flow sensor tested at a local auto parts store.

You are welcome to call and speak with Tim if you would like. PM for the phone.
__________________
"Compulsuve nervosa collectorus 'Plantii')
Reply With Quote
  #14 (permalink)  
Old 12-06-2010, 08:45 AM
4seasons's Avatar
Gold Oak Member
 
Join Date: Aug 2005
Location: Millersburg, ohio
USDA Zone 5
Posts: 936
4seasons is on a distinguished road
my 03 did this and it was an altenator and battery
Reply With Quote
  #15 (permalink)  
Old 12-06-2010, 11:21 PM
Stonehenge's Avatar
Administrator
 
Join Date: Jan 2003
Location: Wisconsin
USDA Zone 4
Posts: 9,092
Stonehenge will become famous soon enough
Ok, here's what I did. I went out a bought an Actron CP9580, a diagnostic computer thing.

It was the fanciest model at the local Advance Auto Parts, and it was on sale for $199.

And then I checked on eBay and saw I could probably get one for about $170.

Then I saw I could get it at Amazon for $169.

Then I googled and found a place, selling through Amazon, that offered 25% off the Amazon price. With free shipping, it was $127.

It can record and store live engine and performance data and provide likely fixes for problems. Seemed like for as often as I'd want to use it, this thing would end up saving me some money. (As he crosses his fingers...)
Reply With Quote
Reply

You might like the following content from the Ground Trades Xchange, served by Google:

Thread Tools

Posting Rules
You may not post new threads
You may not 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


Free Landscaping Magazines
Similar Threads
Thread Thread Starter Forum Replies Last Post
A truck to grow with Greenmun Heavy Equipment 9 10-11-2010 07:18 AM
My first big truck groundwork Landscaping Tools 8 02-08-2007 08:18 PM
Decisions, Decisions Truck decisions Bill Schwab Landscaping Tools 5 08-27-2005 09:35 AM
Cold weather truck washing? jwholden Landscaping Tools 6 02-02-2004 10:00 AM
Truck repairs Bill Schwab Landscaping Tools 25 12-11-2003 11:27 PM

All times are GMT -4. The time now is 09:38 PM.


Powered by vBulletin®
Copyright ©2000 - 2018, Jelsoft Enterprises Ltd.
Copyright 2003-2016 Ground Trades Xchange, LLC