Thread: Idle Speed Fluctuations
11-03-2008, 09:36 AM #1
Idle Speed Fluctuations
What are the main causes of idle speed fluctuations in a 4Tec engine? For simplicity sake, lets eliminate the supercharger from this discussion and focus on the engine naturally aspirated. I am looking for the common causes of loping in the base model engine and how to resolve those issues.
11-03-2008, 10:10 AM #2
- Join Date
- Dec 2006
- Crest Hill, IL
11-03-2008, 10:28 AM #3
My GTX SC moves from 1700-1840 rpms idling in the water. Are you seeing more?... Ron
11-03-2008, 11:32 AM #4
Air leak is number one cause of idle fluctuations as described.
11-03-2008, 11:39 AM #5
How much can it fluctuate and still be acceptable?
11-03-2008, 12:29 PM #6
That is what I thought. Are there any specific issues that normally occur in the TB? I am probably seeing more like a 200 rpm swing. It is not consistent all the time. Sometimes it seems to surge a little more than others.
11-03-2008, 02:11 PM #7
- Join Date
- Apr 2005
I.a.c. Motor sticking? Or tps out of range.todd
11-03-2008, 06:02 PM #8
i saw this problem before where the ski would drop to about 1000 rpm from 1840rpm we changed the spark plugs and the coils n we were good to go this was on a naturally aspirated 4tec engine i dont think this would be the main cause because it sounds like your ski is super charged so i'm not really sure maybe 1 of the gurus will chime in
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