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 Raised idle at startup

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marktjoliver
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PostSubject: Raised idle at startup   Mon Mar 13, 2017 1:21 pm

Weather is getting better so more time to play with the GRiSO. I have an 850 version and the issue is with startup it used to have a high idle(1600rpm) that after a few seconds would go to a steady idle. Now the bike is running perfectly apart from this one issue and i'm guessing this could be related to the temp probe in the engine. The air temp monitor on the dashboard is spot on accuate so suspect this might not be the faulty item. Is the engine temp probe repairable of a throw away item? If it is repairable, how?  Are there any other things i should be looking at before removing the temp sensor?
Thanks in advance for any help offered.
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Oz1200Guzzi
Don Abbondio
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PostSubject: Re: Raised idle at startup   Mon Mar 13, 2017 1:49 pm

Mark, I assume (not always the correct thing to do) that your bike has the engine temp sensor in the inside of the R/H head, just behind the injector. Remove it carefully, and fill the tubular spacer with engine grease, reassemble.

The problem lies in the disconnect between the head and the sensor. This unit is designed to be a water temperature sensor in many vehicles and as installed from the factory, will not work right, due to the air gap. The grease allows the sensor to detect the real temperature of the head in a more timely fashion. The head gets up to the heady heights of just over 100 C when riding.

Hope this helps.
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beetle
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PostSubject: Re: Raised idle at startup   Mon Mar 13, 2017 1:57 pm

The air temp sensor in the dash has nought to do with the engine. There is another air temp sensor in the air box that has a direct affect on the fuel injection.
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marktjoliver
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PostSubject: Re: Raised idle at startup   Wed Mar 15, 2017 1:52 pm

thx for the help will try both ideas at the weekend.
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marktjoliver
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PostSubject: startup    Sat Mar 18, 2017 8:50 am

Ok, here goes.
I removed the temp sensor in the air box and measured the resistance at different temperatures and it appears to be ok  and compares well the temperature list in the manual.
I removed the engine temp sensor and again measured the resistance and at different temp and all appears ok. I reassembled this with thermopaste grease as recomended.
I started the engine and no rise in revs so just hold onto throttle and rev gently till warm and perfect tickover achived.  I then let the engine cool for a minite or two and start the engine again and the revs rise to nearly 2000 rpm and then settles back down to a perfect tickover.
Any ideas as to what might be causing this warmly welcomed.

thanks in advance Mark
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