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Ignition/Tuner/ECM/Fuel Injection Need advice on ignition issues? Questions about a tuner? Have questions about a EFI calibration or Fuel Injection? Tips on Engine Diagnostics, how to get codes, and what they mean. Find your answers here.
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  #1  
Old 07-25-2008, 05:05 AM
redned redned is offline
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Default backfire in intake

2001 springer st, hard to start and is backfiring at idle,no codes will come up .but a twin scan 2 shows the timing to be different on one cylinder at idle and low rpm.plugs,cables,coil are good three days of this is getting old help...........,
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Old 07-25-2008, 02:07 PM
Doc 1 Doc 1 is offline
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Default RE: backfire in intake

Check intake for leaks, do a compression test to see if intake valves are leaking
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Old 07-25-2008, 11:03 PM
redned redned is offline
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Default RE: backfire in intake

I checked for a air leak around the intake but I will do a leakdown test on it, this bike has 15000 mile on it ,I can"t understand why there is 10 degrees different in timing&nbsp\\; between cylinders,.
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Old 07-26-2008, 08:41 AM
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Default RE: backfire in intake

It's common to see AFR and timing to jump all over the place at idle due to the MAP pulses. The timing and AFR&nbsp\\; should mellow out off idle though.
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Old 08-03-2008, 12:17 AM
redned redned is offline
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Default RE: backfire in intake

today I unpluged the MAP sensor and the bike ran good, as soon as iI plug it back in it starts backfiring again. I have another MAP that I put in the throttle body and put the wires on the other one and let it hang ang it runs good and the light dont stay on ,what do I do next.
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Old 08-03-2008, 12:51 AM
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Default RE: backfire in intake

I would check the IAC steps now but you need a digital tech or a SERT in data mode to see what the steps are.
&nbsp\\;
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Old 08-08-2008, 10:56 PM
redned redned is offline
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After all the checking the customer said the ecm had a hd download in it but with a twin scan 2 it didnt show that,I put a new ecm on the bike and now it runs good.. thinks for the input
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Old 08-08-2008, 10:56 PM
 
 
 
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