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[grc]

grc, WHat if I just find a temperature sensor on ebay and replace it?

[grc]

Engine Temp Sensor

[grc]

Intake Air Temp Sensor

[103_RK]

GRC, thanks for the info.  Is there any way you could email it to me along with the ecm pinout diagram so that I can try it out?  I read through it and it sounds like good things for me to check.  It says to check specific ecm pins though and it would be easier if I had the pinout diagram.  If this is not too much trouble, my email address is scon@comcast.net.  I am hoping that the race tuner will help the overall performance of the bike.  But, I don't see how it will help this backfire.  I guess it's possible.  I see a throttle body for a late model touring bike on ebay.  If it stays cheap, I may just buy it for parts.  That would give me the injectors and intake sensor anyway.  Thanks again

[grc]

GRC, thanks for the info.

[103_RK]

Haven't checked the leak idea yet.  I will check it Friday when I am off.  I ride it most days and don't feel like messing around with it after work.  If I don't get done I can't ride the next day.  Thanks again for all of your help, I will try removing the sensor.

[103_RK]

I looked to see if there was any fuel leaking in tha intake when the ignition was turn on multiple times, I could not see any.  Also (GRC) I tried to follow the diagrams to check sensors for resistance.  the diagrams are for a newer than 03 bike.  Mine only has half of the connector pins.  I need to purchase the electrical diagnostic manual and check the pins for my bike.  Thanks for the help.  I will buy the race tune in the next week or so and try again after the new map is installed.

[Unbalanced]

103RK,

The reason the new racetuner has the decel and accel pump features added is that Harley already knows there is an issue with changing the pipes.   If you had had Vance Hines it would just be the pipes sucking up the air which is why harley insisted that they put a valve in the SE 2 into 1 pipe.   Since its the Rhineharts its most likely just a decel pop and the latest software 4.50 fixes that with a simple temp range adjustment it should go away.   I would not get way ahead of yourself until after you install / tune the racetuner.

just my 2 cents on it.

[Ed Ramberger - One_Screamin_Eagle]

Holy cow - all the wasted time and silly ideas thrown out there.  It doesn't need a sensor, it doesn't have an injector leak.  Tune it correctly with SERT, use decel enleanment to add or take away fuel as different combinations like different things and play with timing on decel if necessary.  Also realize that some pipes will always have some decel pop.  

[grc]

Holy cow - all the wasted time and silly ideas thrown out there.

[103_RK]

I think i will wait for the race tuner anyway.  Maybe this will help.  This problem is a backfire on warm starts.  I cannot see anyextra fuel in the intake.  I am getting ready to order the race tuner, was only waiting for the money.  I will let you know if the race tuner helps.  It's getting cold now so my riding will slow way down.  I don't like to ride as much when it is in the 40's in the morning.  Thanks for the tips

[Unbalanced]

Another cause could be your TPS positioning.  (TPS)= throttle positioning sensor.
it could be bad / could be butterfly is closing to close and other things just another suggestion.  

If your butterfly closes to tightly should be around .0025 and .003 room underneath it snug to the feeler gauge.  

I would still look at the startup fuel / temp comparision and or charge robbing.

If the TPS is set correctly and within tolerances (geesh I hate that)  to varied in harley's case, but none the less I would expect you will resolve this with the race tuner.

Another possibility:  I may have missed it, also are you sure your mufflers arent sucking air up into a dry port and causing the backfire as well ??

What type of exhaust setup do you have ?  sorry if I missed it.

[103_RK]

I have Rinehart true duals with 2.5" baffles.

[Unbalanced]

RK,

The rhineharts dont suck air up into them so I doubt its the pipe causing the issue.   I would recommend though looking for the 2 1/4 baffles if your bike is stock or near stock unless you just cant live without the sound you get from the 2 1/2 baffles.   The bike will run better with 2 1/4 did with my 103 and my 124.

When are you getting the race tuner / powercommander ?

Have you checked the bike for an intake leak?   You can do this by spraying break clean around the intake manifold with the bike running if the bike begins to die or does die that would be a fast thing you could rule out.

[Ed Ramberger - One_Screamin_Eagle]

This was never described by 103RK as a "decel pop" - it is a major backfire when starting the engine.