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CVO Technical => Twin Cam => Topic started by: idzin on August 16, 2018, 07:16:12 PM

Title: Sputter and loss of power
Post by: idzin on August 16, 2018, 07:16:12 PM: I was having a problem with my 2004 CVO Deuce sputtering and losing power. It has been a while since I had a complete service so I did that. New plugs, fluids, filter...etc... Well after all that... its is still sputtering and losing power. Sometime when this happens the engine light comes on. What would be my next thing to check? could this be electronic?
Title: Re: Sputter and loss of power
Post by: Twolanerider on August 16, 2018, 08:09:51 PM: Quote from: idzin on August 16, 2018, 07:16:12 PM
I was having a problem with my 2004 CVO Deuce sputtering and losing power. It has been a while since I had a complete service so I did that. New plugs, fluids, filter...etc... Well after all that... its is still sputtering and losing power. Sometime when this happens the engine light comes on. What would be my next thing to check? could this be electronic?

If the light is on it has thrown a code. Pull the codes and have the bike help tell you what its problem might be.
Title: Re: Sputter and loss of power
Post by: idzin on August 17, 2018, 08:30:41 AM: I pulled 2 codes out of the odometer... P1004 & P 0108
Title: Re: Sputter and loss of power
Post by: hd-dude on August 17, 2018, 11:43:53 AM: P0104 does not come up as a valid code? Double check that one....P0108 is a MAP sensor code. Could be a broken wire a on the wire harness where it leaves the fram backbone down towards the sensor. I've seen them break here on several occasions.
.
Title: Re: Sputter and loss of power
Post by: idzin on August 17, 2018, 11:46:55 AM: Thanks...That was a typo...the other code was P1004
Title: Re: Sputter and loss of power
Post by: Joel on August 17, 2018, 11:51:18 AM: P0104 = Mass air flow sensor, the sensor gives air intake volume information to the ECM, when the wire in the sensor gets dirty than the signal can become out range and provide false volume of air entering the engine, check for vacuum leaks and also the connector for corrosion.
P0108 = Map sensor, the sensor may have a seal that is leaking vacuum, or it is bad.
Both of these codes can cause the symptoms your having and using a scanner to monitor the signal would help.
Again check connections and grounds, check for vacuum leaks, with engine running you can use carb cleaner with the straw to direct the spray at the mounting area of both parts. Use a rag close by the areas you spray to catch drips.
If there is a leak the cleaner will affect idle quality.
Title: Re: Sputter and loss of power
Post by: Joel on August 17, 2018, 12:00:31 PM: P1004 = System relay, could be a bad relay, you can get the number off of it and get a new relay from NAPA install it clear codes and than rid the bike to see if the code [ s ] return
Title: Re: Sputter and loss of power
Post by: hd-dude on August 17, 2018, 12:47:00 PM: Harley's do not have a Mass Air Flow Sensor...
Title: Sputter and loss of power
Post by: Unbalanced on August 17, 2018, 01:15:55 PM: Check your fuel pressure should be in the 50’s

A lot of the older bikes like yours got holes in the fuel lines from rubbing. They would and start normally then run then die as the prime pushed enough fuel to start as usual.

Can also be fuel filter or pump they changed the mileage range on the filter change
Title: Re: Sputter and loss of power
Post by: grc on August 17, 2018, 01:34:21 PM: Two very common issues I would suggest you check out:

Fuel pressure.
Vacuum leak.

Jerry
Title: Re: Sputter and loss of power
Post by: idzin on August 31, 2018, 09:23:14 AM: update....
Turns out the throttle body assembly is damaged. The pin for the flap is broken. the mechanic recommends a complete upgrade of the induction module. any thoughts?
Title: Re: Sputter and loss of power
Post by: idzin on August 31, 2018, 10:51:51 AM: I'm going with an upgrade to Horsepower Inc. throttle body...51mm
Title: Re: Sputter and loss of power
Post by: hd-dude on August 31, 2018, 11:31:49 AM: That is a great Throttle body. May be a bit big for the stock 95" but a good tune will go a long way.