Yesterday was out boat was running fine. Ran around a bit then stopped @ a local watering hole. No issues to this point. Got back to the boat smelled gas found the fuel filter came loose, my fault for not checking everthing after last run. Anyway fied and cleaned up and waited a while to be safe before starting. Now the issue after ideling back down the river I put the boat in neautral and the idle ran up to about 17-1800 RPM????? Shut it down cuz I sure as hell was not going to shift like this. Fired it back up and it was fine. Went back out on the lake and ran it, after slowing down same thing, fast idle. WTF? shut down fired again and fine. If I idle around it's ok but once I run it and slow back down it happens. Any ideas??????? Thanks Jason
Thread: Fast Idle Issue
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06-26-2009 08:45 PM
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06-26-2009 08:52 PMIt's efi I take it?
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06-26-2009 08:59 PMHave you checked the idle air control
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06-26-2009 09:10 PMCheck the counts on the IAC, also what the ECM voltage is internally, you have a scan tool ?
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06-26-2009 09:17 PMI had a ECM with a high voltage and the engine idle was doing the same as yours, make sure that you do not have an over voltage on the charging system, if so it will change the voltage in the ECM. My ECM had something wrong with it inside and would read a higher voltage than the batt. or charging system was putting out. Check the IAC first before you jump on the ECM, but do check it with a scan and code readings.
www.merperformancemarine.com
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06-27-2009 12:29 PM
It appears the IAC is bad. The counts on the IAC were 138 when @ idle. Shut off re start and the counts were at between 8-16. Manual states 0-40 counts (steps) is ok. I checked the plug with a test light, engine running test light grounded and touched all four connections. The light blinks on all four. Connections all clean. When it would idle fast the it was at the same RPM as with the sensor unpluged. Almost forgot the internal voltage of the ECM was 14.4 Vdc. Thanks again merperformance. I'll let you know how it is after the new IAC. Jason
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06-29-2009 05:49 PM
Should have the new IAC by Wed.
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07-01-2009 07:37 PM
Installed the new IAC. Key on for 10 sec key off for ten sec then started the motor. Idels right back @ 17-1800 RPM. What to do what to do.
After it sat for a bit I tried it again. Now it seems to be ok. I have to lake test it to be sure (bummer). I'll let you know what happens.
JasonLast edited by Warlock28SXT; 07-01-2009 at 08:19 PM.
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07-05-2009 10:36 AM
Any other ideas? All things pointed at the IAC. Well now there pointing else where. Still does the fast idle after a run. Shut it down refire ok.
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07-05-2009 11:04 AMhave you checked readings on the TPS??
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07-06-2009 09:41 AM
sorry to hear your still having issues Jason
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