Misfiring. Need Help! - VTXOA
 
LinkBack Thread Tools
post #1 of 5 (permalink) Old 05-25-2016, 06:10 PM Thread Starter
Junior Member
 
Join Date: May 2013
Location: New Jersey
Posts: 6
Unhappy Misfiring. Need Help!

Ok Guys, Here goes;
2002 vtx 1800C. 73,000 miles, bought it new. K&N air filter and Roadhouse Shorty exhaust installed 70,000 miles ago. Other than that, the motor is completely stock. Never had a single problem with the bike.... until now. Took it out for a short ride the other day and after about 5 miles it started missing really badly, backfiring and bucking like a wild horse. Got it home and replaced the stock iridium plugs with Bosch 4419's. (stock "deep" plugs had some fouling.) Took it out for about 15 miles. Same problem. Shut it off and restarted it and it ran fine all the way home. Back out for another 5 miles, same thing again. Back home, used induction timing light to check each wire. Every one showed an intermittent miss at mid to high rpm. Never has flashed a code on the FI light. Here's what i've done so far:
New Plugs.
Removed coils.
Inspected plug wires for breaks.
Trimmed ends of plug wires and reinserted them into coils.
Ground fix mods were done in 2003. Did them again.
Unplugged and sprayed contact cleaner on all connections under the seat, side panels and left engine cover. (Chrome one below the ignition key).
Installed new battery.
Rode 1/2 mile and it started missing again.
Ideas? Bad coils?(could both go bad at the same time?) Bad ECM?
Axion is offline  
Sponsored Links
Advertisement
 
post #2 of 5 (permalink) Old 05-25-2016, 06:25 PM
Pope "papa" of the VTXOA
 
Chicago-Spike's Avatar
 
Join Date: Nov 2003
Location: St Charles, IL.
Posts: 62,146
How's you fuel mileage been lately? Check the oil see if it is overfilled or reeking of fuel. The 2002-2004 models with the internal fuel pump have a known fail issue with the Fuel Pressure Regulator or FPR.

AMA Life Member 721314
Chicago-Spike is offline  
post #3 of 5 (permalink) Old 05-25-2016, 07:35 PM Thread Starter
Junior Member
 
Join Date: May 2013
Location: New Jersey
Posts: 6
Performed the FPR check. No issues
Axion is offline  
 
post #4 of 5 (permalink) Old 05-25-2016, 09:44 PM
Senior Member
 
Hans&Feet's Avatar
 
Join Date: Jun 2005
Location: Conyers/McDonough, GA
Posts: 8,331
Garage
2002----Check the 2 pin connector near the starter relay
http://tech.bareasschoppers.com/tech...d-main-wiring/

2005 1300c Red, Mustang seat, HK 2.5 straights. Leds for safety-front & back. 181,111 miles of smiles

Last edited by Hans&Feet; 05-25-2016 at 09:48 PM.
Hans&Feet is offline  
post #5 of 5 (permalink) Old 05-25-2016, 10:02 PM
Senior Member
 
Join Date: Dec 2015
Location: Dallas
Posts: 476
Double check your ground fix. Did you tighten the battery cables with a wrench? You cleaned those also, didn't you?
vtxtugg is offline  
Reply

Quick Reply
Message:
Options

Register Now



In order to be able to post messages on the VTXOA forums, you must first register.
Please enter your desired user name, your email address and other required details in the form below.

User Name:
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:
OR

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.



Thread Tools
Show Printable Version Show Printable Version
Email this Page Email this Page



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

 
For the best viewing experience please update your browser to Google Chrome