i've been having problems with my wife's 04 deuce and can't figure it out. the motor is an injected 88b with a stage 1 air cleaner, martin brothers wtf pipes no baffles, and v&h fuelpak. all was well then resently it started having a hard time starting and idling when cold. once it warms up it runs fine. at first i thought it was the fuel pump because it started make a strange noise when pressurizing the system. i replaced it and the it sounds normal now, but the cold start and idle is still rough. i know it's not the idle control sensor. i pulled the plug and the idle went all over the place and it still stumbled. it's not a vaccum leak, i sprayed all areas that could have a leak with carb cleaner and the idle was un changed. any ideas or answers would be appreciated.

thanks
dingo

 

Try something simple first. Use a spray cleaner to clean out the idle air passage. Remove the air cleaner and squirt the cleaner into the hole at the top of the throat. Switch the ignition on and off to activate the plunger in the hole that controls the air during idle. Also clean the entire throttle body. Protect the motor finish from over spray.

 

i cleaned the iac and no change. checked battery cables all tight. pulled the iac and it came apart in three peice which i think may have been the problem. the needle is threaded into the servo and seems like it is stripped or cracked inside. dealer doesn't have one so it's on order. updates to follow.
thanks for the ideas.

 

Think about the Temp sensor. sounds like it is not compensating fro a cold starting.

All this sensor stuff checking starts out with ,"Change to a known sensor". I rarely have that lux.

 

 

ok all
first off thanks to all that responded. second the iac was the problem. i put the new one in and the bikes idle is perfect. i remapped the fuelpak and the bike hasn't ran this good in while. a friend said that you should remap occasionally then ride the bike for about 40 or 50 miles to clear out any junk the ecm may have put in it's memory. by the way the bike never put out any codes so i guess the self diagnosys is worthless.
thanks again
dingo

 

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