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Old 10-27-2005, 08:58 AM   #1
budmelon
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RPM Fluctuates

Hi everyone,

I did a search and can't find the answer so I'm going to ask the expert. I have a '05 with 2.0l Duratec and I noticed that when the engine is cold, I'll start the engine, the rpm will goes to about 2000 or maybe less (Sorry, I didn't look at where the needle is), but then, it will fluctuates between say 2000 to 1900. So about 100 or so difference. Is that normal? Most vehicle I have usually stays at the one rpm when it is warming up. I can definitely see the rpm needle goes up and down on the Focus.

Hope I make sense.

Thanks.


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Old 10-27-2005, 09:07 AM   #2
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tach

I'm not sure if it's normal or not either, but mine doesn't have a Tach - when I did the trip-meter thing and was watching the digital Tach - I couldn't believe how much flucation there is in the idle, warm or cold. I just guessed that the needle version didn't reflect the full story? It's interesting to see your question; I too am interested in the answers. (Mine is the 2.oL Duratec as well.)
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Old 10-27-2005, 09:35 AM   #3
Zurkowski
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I also notices the samething on my 05 ST.
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Old 10-27-2005, 09:48 AM   #4
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Make sure all the lines hooking up to the intake and all the clamps are very tight. Mine did that for a while and it was because the clamp on the bottom part of the intake box was loose. If you have a CAI it means it has come loss because I have done that too. Drive down the road and see it laying behind.


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Old 10-27-2005, 10:06 AM   #5
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This is normal. --At least Ford says it is. I was looking at the service report for mine yesterday. There was a memo at the bottom.

Here it is: 18849 2005 FOCUS - MOMENTARY IDLE ROUGHNESS ON COLD STARTS
SOME 2005 FOCUS VEHICLES MAY EXHIBIT A SLIGHT IDLE ROUGHNESS/MISFIRE FEELING ON COLD STARTS THAT LASTS FOR APPROXIMATELY ONE (1) MINUTE IN THE 1100-1500 RPM RANGE. SOME VEHICLES MAY ALSO MOMENTARILY EXCEED 2000 RPM ON INTIAL START UP AND THEN SETTLE TO NORMAL IDLE RPM. THIS IS NORMAL OPERATION TO ENSURE THAT THE CATLYTIC CONVERTER QUICKLY REACHES OPERATING TEMPERATURE DUE TO THE LOW EMISSION CHARACTERISTICS OF THE VEHICLE. SEASONAL FUELS AND TEMPERATURES MAY MAKE THIS CONDITION MORE NOTICEABLE. IF THIS CONDITION IS OCCURRING WITHOUT ANY DIAGNOSTIC TROUBLE CODES OR OTHER DRIVEABILITY SYMPTOMS, DO NOT ATTEMPT REPAIR.
EFFECTIVE DATE: 09/26/2005

Sorry about the caps. just did a cut and paste.
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Old 10-27-2005, 11:54 AM   #6
budmelon
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BlacKnight,

Thanks for that excellent service report. I will definitely sleep better tonight!!!
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Old 03-17-2013, 03:19 AM   #7
jc_5254
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Ever fixed that rpm fluctuation problem on your ST?

so sorry to bother, i know that this is 8 years old
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