bigwrench3311 - 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 09-23-2012, 02:02 PM
Registered User
 
Join Date: Sep 2012
Posts: 6
Wiki Edits: 0

Thanks: 1
Thanked 0 Times in 0 Posts
bigwrench3311

working on 1993 dodge dakota 3.9L 4x4 auto. no spark ,have 12 volts to coil. changed crk. sensor,cam sync. no help. has 12 volts to f.pump but pump is bad. please help! thanks.

    Advertisement
Reply With Quote Quick reply to this message
Sponsored Links
Advertisement
 
  #2 (permalink)  
Old 10-17-2012, 10:29 AM
hcompton's Avatar
Old & Furious
 
Join Date: Oct 2012
Location: MD
Age: 41
Posts: 1,074
Wiki Edits: 0

Thanks: 6
Thanked 87 Times in 84 Posts
Most efi will not run the pump if there is no spark or crank signal. That might be your issue with the pump. Also no fuel pressure no spark in new efi systems but i know nothing about dodge. Just trying to help.

Always check computer ground and 12V at ecu hot wire. Bad grounds will hang up even the best mechanics. Make sure the block has a ground wire running from the motor to the frame also.
Reply With Quote Quick reply to this message
  #3 (permalink)  
Old 10-17-2012, 02:06 PM
sbchevfreak's Avatar
Licenced Automotive Technician
 
Last photo:
Join Date: Feb 2004
Location: Land of big Easter eggs, Alberta
Age: 34
Posts: 1,604
Wiki Edits: 0

Thanks: 8
Thanked 9 Times in 9 Posts
Dodges of this era were notorious for coils going kaput. Remove the coil, and look at the laminbated core for any signs of rust or swelling. If there is ANY sign of this, replace the coil, as they swell internally, and kill the windings.
Reply With Quote Quick reply to this message
  #4 (permalink)  
Old 10-17-2012, 05:53 PM
LATECH's Avatar
Hotrodders.com Moderator
 

Last journal entry: Motor - vator
Last photo:
Join Date: Jul 2010
Location: Northeast Pennsylvania
Posts: 5,180
Wiki Edits: 0

Thanks: 199
Thanked 252 Times in 234 Posts
Check the basics as the guys have mentioned earlier in the post.

The coil may have power, but you also need to check to see if it has the ground pulse from the PCM to fire the coil.

The coil needs a ground pulse, and it is supplied by the PCM.
Hook your test light clip to the battery positive, then un hook the plug at the coil. Probe the non hot (not the 12 v + side) side of the coil harness, and crank the engine. It should blink as the engine is cranked.
If it does not the PCM is likely the problem.
If it does blink, the the coil must be defective.
The PCM processes the cam and crank signal and triggers the coil and injectors. The PCM could be defective in the output stage to the coil, or the reference voltage section for the cam and crank sensors has failed, and they arent generating a signal for the PCM to use for coil triggering.
__________________
Fact is stranger than Fiction
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
bigwrench3311 bigwrench3311 Modern Electronic Engines 1 09-20-2012 07:06 PM
bigwrench3311 bigwrench3311 Introduce Yourself 0 09-20-2012 02:54 PM


All times are GMT -6. The time now is 12:49 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.