inconsistant idle
#3
08-18-2008 | 10:34 AM
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Joined: Dec 2007
Posts: 83
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I posted this on another forum recently, you might try it.
For what it's worth, my '03 RK Classic has been having trouble maintaining idle speed for a few months now. She's got 43,000 on the odometer. It'll idle real slow after it's warmed up, then jump back to 1050 rpm's or so, then next time you roll to a stop, chug chug again. I tried re-programming the ECM with a higher idle speed to try and fix this. The other day, I thought maybe the IAC was not working right, but per other posts on this forum, took the air filter off and cycled the ignition switch. I could see the IAC doo dad moving back and forth. Thought I'd try to spray some carb cleaner up in there in the idle air passage. Tons of black crap came flooding out of the passage. Now, I don't know if carb cleaner is good for everything in there, but just like that, the idle is perfect. Went for a long ride yesterday, and at every light and stop sign, she settled in right at 1096 and stayed there. I re-programmed the idle speed at 1000, and this morning coming to work, she stayed right there. Just thought I'd pass it on to anyone who might be having this problem. Youz EFI experts out there, was this the right thing to do?
Also added some more "structions" by request:
I pulled the air filter. If you look up into the top side of the throttle body opening, just outside the throttle plate, there's a hole, about 3/8" diameter. If you look up into the hole, there's a "doo dad" in there. Thats the Idle Air Control valve, which controls idle speed, like an idle speed screw on a carbed engine. If you turn the ignition switch on with the kill switch on, then off again, the "doo dad" will cycle open and closed. With everything turned off, I sprayed the cleaner into the hole with the small tube attached to the nozzle of the can, to get pressure into the hole. Lots of crap was flushed out, probably also into the intake manifold. I put a towel under the throttle body to keep the cleaner off the engine.Then re-installed the filter to lessen the chance of backfire setting my garage on fire. Then I cranked her up. She didn't want to start that well, must be carb cleaner and carbon don't burn well. Repeated this process twice more, then called it good. Good luck, hope this fixes your problem. I ride to work every day, and to lunch. This really seems to have fixed my issue.
Good luck.
For what it's worth, my '03 RK Classic has been having trouble maintaining idle speed for a few months now. She's got 43,000 on the odometer. It'll idle real slow after it's warmed up, then jump back to 1050 rpm's or so, then next time you roll to a stop, chug chug again. I tried re-programming the ECM with a higher idle speed to try and fix this. The other day, I thought maybe the IAC was not working right, but per other posts on this forum, took the air filter off and cycled the ignition switch. I could see the IAC doo dad moving back and forth. Thought I'd try to spray some carb cleaner up in there in the idle air passage. Tons of black crap came flooding out of the passage. Now, I don't know if carb cleaner is good for everything in there, but just like that, the idle is perfect. Went for a long ride yesterday, and at every light and stop sign, she settled in right at 1096 and stayed there. I re-programmed the idle speed at 1000, and this morning coming to work, she stayed right there. Just thought I'd pass it on to anyone who might be having this problem. Youz EFI experts out there, was this the right thing to do?
Also added some more "structions" by request:
I pulled the air filter. If you look up into the top side of the throttle body opening, just outside the throttle plate, there's a hole, about 3/8" diameter. If you look up into the hole, there's a "doo dad" in there. Thats the Idle Air Control valve, which controls idle speed, like an idle speed screw on a carbed engine. If you turn the ignition switch on with the kill switch on, then off again, the "doo dad" will cycle open and closed. With everything turned off, I sprayed the cleaner into the hole with the small tube attached to the nozzle of the can, to get pressure into the hole. Lots of crap was flushed out, probably also into the intake manifold. I put a towel under the throttle body to keep the cleaner off the engine.Then re-installed the filter to lessen the chance of backfire setting my garage on fire. Then I cranked her up. She didn't want to start that well, must be carb cleaner and carbon don't burn well. Repeated this process twice more, then called it good. Good luck, hope this fixes your problem. I ride to work every day, and to lunch. This really seems to have fixed my issue.
Good luck.
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