Engine noise... help
Postmaster
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From: Calgary Canada
Engine noise... help
I gotta agree with Forty on this one. If running premium fuel solves the problem then you have a problem. These engines are designed to run on 87. I for one don't want to HAVE to fill up with expensive premium.
There are numerous sensors that detect knock and fuel mixture and adjust timing accordingly. If you have to run premium to avoid knocking (which I'm not sure is the cause of your sound in the first place) then one or more of these sensors is malfunctioning and you should be getting the engine diagnosed as Forty suggested. If the noise was only very occasional, and only when heavily loaded, then it may be due to fuel quality where the range of adjsutment within the computer simply wasn't adequate. In this case, running premium is the answer. In your case, I don't think premium is required, or the solution, though it might mask your problem.
Waxy
There are numerous sensors that detect knock and fuel mixture and adjust timing accordingly. If you have to run premium to avoid knocking (which I'm not sure is the cause of your sound in the first place) then one or more of these sensors is malfunctioning and you should be getting the engine diagnosed as Forty suggested. If the noise was only very occasional, and only when heavily loaded, then it may be due to fuel quality where the range of adjsutment within the computer simply wasn't adequate. In this case, running premium is the answer. In your case, I don't think premium is required, or the solution, though it might mask your problem.
Waxy
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From: Del Rio, Texas USA
Engine noise... help
wow, i was unaware these V10's were elctronicaly timeing adjusting for those variables such as inputs from knock sensors? huh, ... , I gues we have VTEC engines, like the hondas. Variable timing electronicaly controled.
im done with this post, good luck to the original poster of this topic, please keep us informed on what FORD diganoses your pre detonation as.
Jetjock16
im done with this post, good luck to the original poster of this topic, please keep us informed on what FORD diganoses your pre detonation as.
Jetjock16
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Joined: Feb 2002
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From: Calgary Canada
Engine noise... help
Originally posted by jetjock16
wow, i was unaware these V10's were elctronicaly timeing adjusting for those variables such as inputs from knock sensors? huh, ... , I gues we have VTEC engines, like the hondas. Variable timing electronicaly controled.
im done with this post, good luck to the original poster of this topic, please keep us informed on what FORD diganoses your pre detonation as.
Jetjock16
wow, i was unaware these V10's were elctronicaly timeing adjusting for those variables such as inputs from knock sensors? huh, ... , I gues we have VTEC engines, like the hondas. Variable timing electronicaly controled.
im done with this post, good luck to the original poster of this topic, please keep us informed on what FORD diganoses your pre detonation as.
Jetjock16
This technology isn't new or revolutionary, Ford's been using it in trucks for years (both the 302 & 351W). Spark advance/timing is variable by +/- ~2 degrees, based on input from the knock sensor. As for high tech, there are snowmobiles that have this technology.
By the way VTEC stands for Variable Valve Timing & Lift Electronic Control System and has nothing to do with ignition timing. Try here for more info http://www.howstuffworks.com/question229.htm
Waxy
Last edited by Waxy; Feb 3, 2003 at 04:03 PM.
Senior User
Joined: Jun 2002
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From: Denver USA
Engine noise... help
I have the older V10, which does in fact have the flutter noise at around 2000 rpm's. Sounds like pea gravel shaken in a coffee can.
My old 4.0 V6 had pre-detonation just before WOT at elevations above 9,000 feet. Sounded similar to the flutter, but with less peas in the can. I never worried about it because I would just floor it and it would go away, and since it happened during major elevation changes I figured it was the sensors not compensating fast enough for the pressure change in the air.
Either condition could be a possibility, but if it is pre-detonation there is something majorly wrong with the engine and sensors. I can feed my V10 85 octane and it won't knock, and it better not ever knock with 87. Feeding an un-chipped vehicle premium 91 octane is a waste of money and a poor fix for a badly tuned engine. But if it makes you feel warm and fuzzy that you fed your baby the caviar instead of fish eggs, then have at it.
My old 4.0 V6 had pre-detonation just before WOT at elevations above 9,000 feet. Sounded similar to the flutter, but with less peas in the can. I never worried about it because I would just floor it and it would go away, and since it happened during major elevation changes I figured it was the sensors not compensating fast enough for the pressure change in the air.
Either condition could be a possibility, but if it is pre-detonation there is something majorly wrong with the engine and sensors. I can feed my V10 85 octane and it won't knock, and it better not ever knock with 87. Feeding an un-chipped vehicle premium 91 octane is a waste of money and a poor fix for a badly tuned engine. But if it makes you feel warm and fuzzy that you fed your baby the caviar instead of fish eggs, then have at it.
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Engine noise... help
Just a FYI on pre-ignition,detonation,timing,octane,knock sensors,pinging and such.
It is possible for an engine that never had a "pinging"problem in the past to begin to experience this after several thousand miles.
Carbon buildup in higher mileage engines has been known to cause this problem on many engines of different makes and designs.
My .02
It is possible for an engine that never had a "pinging"problem in the past to begin to experience this after several thousand miles.
Carbon buildup in higher mileage engines has been known to cause this problem on many engines of different makes and designs.
My .02
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