Vtx 1800c 2003 Misfiring.. aka missing. - VTXOA
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post #1 of 29 (permalink) Old 05-11-2019, 08:44 AM Thread Starter
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Vtx 1800c 2003 Misfiring.. aka missing.

Doing a repair and update on a New to me X. Bike is missing on the Front cylinder. In an attempt to resolve the issueI have replaced all plugs (DENSO IK 16 5303).... pulled the plug wires and exposed new inner conductor on the spark plug boot side... the issue remains. Additionally in the process of doing an oil change, I noticed the oil smelled slightly of gas...... anyone have additional input?


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post #2 of 29 (permalink) Old 05-11-2019, 08:54 AM
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2 extremely common issues with early 1800's..


bad/poor grounds for spark plug coils...
link to help on FIX
https://tech.bareasschoppers.com/ele...-for-vtx-1800/


bad/defective fuel pressure regulators. ( $40.00 )...



here is a link on Fixing and data for the 1800
https://tech.bareasschoppers.com/
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2005 VTX1800 F, type II, Silver Tribal, 86,000 Miles, Purchased Feb, 2005.
MTC clutch & springs.. K&N Air Filter. Garmin 2597 GPS.
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post #3 of 29 (permalink) Old 05-11-2019, 11:07 AM Thread Starter
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Quote:
Originally Posted by chuck_VTX F View Post
2 extremely common issues with early 1800's..


bad/poor grounds for spark plug coils...
link to help on FIX
https://tech.bareasschoppers.com/ele...-for-vtx-1800/


bad/defective fuel pressure regulators. ( $40.00 )...



here is a link on Fixing and data for the 1800
https://tech.bareasschoppers.com/

Did the Ground fix earlier. Just went back and checked it again...cleaned all surfaces and retightened.


Issue remains.
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File Type: jpg 92C1D819-EE5A-4702-8559-FD6AA87C6C88.jpg (287.0 KB, 15 views)


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post #4 of 29 (permalink) Old 05-11-2019, 11:37 AM
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Like Chuck said. Check the link for the FPR. It tells you how to test it. Also take a good look at your vacuum hoses. If the hose to your FPR looks these (like mine did) the FPR isn't doing its proper job even if it's been replaced.

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"In the day we sweat it out on the streets of a runaway American dream, At night we ride through the mansions of glory in suicide machines
Sprung from cages out on highway nine, Chrome wheeled, fuel injected, and steppin' out over the line" --- Born to Run, Bruce Springsteen
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post #5 of 29 (permalink) Old 05-11-2019, 01:10 PM Thread Starter
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Originally Posted by JoshCube View Post
Like Chuck said. Check the link for the FPR. It tells you how to test it. Also take a good look at your vacuum hoses. If the hose to your FPR looks these (like mine did) the FPR isn't doing its proper job even if it's been replaced.

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Checked the FPR as per the link.... pulled the Vacuum line no fuel present. Turned the fuel pump on .... I
no fuel coming from the vacuum port. According to the tests the FPR is good. However the vacuum lines are old and could stand to be replaced.

I


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post #6 of 29 (permalink) Old 05-11-2019, 01:26 PM
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With the tank off check the two wires off the coil being very careful to look for broken and rubbed insulation. My 06 rubbed through and grounded out as they left the main harness.
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post #7 of 29 (permalink) Old 05-11-2019, 05:29 PM Thread Starter
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With the tank off check the two wires off the coil being very careful to look for broken and rubbed insulation. My 06 rubbed through and grounded out as they left the main harness.

I will check that in the AM. When this began...I also noticed an increase in the engine noise. When this began...this noise comes and goes. Seemingly from the cylinder that is misfiring.

I attached a short video with audio. Again this noise began when the missing began and does come and go.


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post #8 of 29 (permalink) Old 05-11-2019, 09:19 PM
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spark plug wire to plug cap.. is removable.. and can burn at that point..


unscrew the spark plug cap from the spark plug wire.. inspect.....
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2005 VTX1800 F, type II, Silver Tribal, 86,000 Miles, Purchased Feb, 2005.
MTC clutch & springs.. K&N Air Filter. Garmin 2597 GPS.
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post #9 of 29 (permalink) Old 05-12-2019, 07:52 AM Thread Starter
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Quote:
Originally Posted by Landisil View Post
I will check that in the AM. When this began...I also noticed an increase in the engine noise. When this began...this noise comes and goes. Seemingly from the cylinder that is misfiring.

I attached a short video with audio. Again this noise began when the missing began and does come and go.

Good Morning, I pulled all plug wires... checked the Condition of the inner conductor and actually trimmed and exposed anew portion of the conductor. I had a second Vtx 1800. I pulled the front coil pack and exchanged it. The issue remains unaffected.

I also checked the wiring to the coil as suggested. I find no exposed wires or damaged jackets that might cause the signal to ground out.

I am beginning to believe that the bike may have a mechanical issue. Unfortunately I am unable to post an audio file to this site. When I ride, I wear a helmet with Bluetooth music...accordingly I am not as familiar with the Engine noise as I should be...however I am fairly certain the noise is not normal.

I will post the video with audio on FB... the only way I know to share it....

https://www.facebook.com/profile.php?id=100002147414607


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post #10 of 29 (permalink) Old 05-12-2019, 08:02 AM
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what do the spark plugs look like...

injector issues..
wiring for injectors.
do the coil/spark plug "spark" with them out of the bike.. test for spark

if spark.. its injector/fuel.. issue.

need to eliminate known good

air into cylinder
spark
fuel
compression.
exhaust

the basics... for an engine to run.
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2005 VTX1800 F, type II, Silver Tribal, 86,000 Miles, Purchased Feb, 2005.
MTC clutch & springs.. K&N Air Filter. Garmin 2597 GPS.
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