I wish I had a recording of this but... About 3 or 4 minutes after a cold start (-20 to -10 C) at low rpm (maybe higher but the Jeep is too noisy) a high pitched whistle that slowly lowers in pitch then disappears after 10 seconds. It only does it when it is cold out.
Maybe this should be in the "MS-II Ignition Setup, Tuning, and Troubleshooting" section but I think this is "Air Supply".
Has anyone experienced this? Other than this "bomb dropping sound" the setup has been running perfectly.
Any ideas?
Thanks, Jim
TPI Whistle/Vac Leak Maybe "bomb dropping sound"
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Read the manual to see if your question is answered there before posting. Many users will not reply if the answer is already available in the manual.
If your question is about troubleshooting, configuration, or tuning, you MUST include your processor type (MS-I or MS-II) and code version in your post. If your question is about PCB assembly or modifications, you must also include the main board version number (1.01, 2.2 or 3.0).
If you have questions about MS1/Extra or MS2/Extra code configuration or tuning, please post them at www.msextra.com Such questions posted here will be moved to: a temporary MSextra sub-forum, where they will be removed after 7 days
The full forum rules are here: Forum Rules, be sure to read them all regularly.
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jimchristiansen
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TPI Whistle/Vac Leak Maybe "bomb dropping sound"
Non Scholae Sed Vitae Discimus
(We do not learn for school, but for life.)
(We do not learn for school, but for life.)
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66fb
Re: TPI Whistle/Vac Leak Maybe "bomb dropping sound"
Jim,
Have you done anything to try and determine the source of the noise?
As you think it's "air supply": I have a Ford PWM IAC that made a noise for awhile after start up. I increased the PWM frequency from the default to a higher value and the noise stopped.
Have you done anything to try and determine the source of the noise?
As you think it's "air supply": I have a Ford PWM IAC that made a noise for awhile after start up. I increased the PWM frequency from the default to a higher value and the noise stopped.
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jimchristiansen
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Re: TPI Whistle/Vac Leak Maybe "bomb dropping sound"
Hello 66fb,
Yes, I've stood there in the cold and mud waiting waiting... no whistle. Get in the Jeep and then there we go! It has stopped now that it has warmed up but I thought I would ask and see if anyone else had this going on. I do have the coolant lines removed from the TPI throttle body and it could be something like venturi icing going through or around the IAC. It only would do it, it seems, during only one kind climactic conditions... About -10 C and dew point at the same temp.
Maybe the diaphragm in the fuel reg is going! I can't/haven't figured it out yet.
Thank you,
Jim
Yes, I've stood there in the cold and mud waiting waiting... no whistle. Get in the Jeep and then there we go! It has stopped now that it has warmed up but I thought I would ask and see if anyone else had this going on. I do have the coolant lines removed from the TPI throttle body and it could be something like venturi icing going through or around the IAC. It only would do it, it seems, during only one kind climactic conditions... About -10 C and dew point at the same temp.
Maybe the diaphragm in the fuel reg is going! I can't/haven't figured it out yet.
Thank you,
Jim
Non Scholae Sed Vitae Discimus
(We do not learn for school, but for life.)
(We do not learn for school, but for life.)
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devastator
- Experienced Squirter
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- Joined: Mon Feb 11, 2008 10:19 am
- Location: Kinda near Tucson Arizona
Re: TPI Whistle/Vac Leak Maybe "bomb dropping sound"
Sounds like the IAC to me.
Sandrail-ACVW 2276 cc, Turbo
MS-II W/spark burning E85
The sand must be punished.
MS-II W/spark burning E85
The sand must be punished.