I have installed TWO IAT sensors, both of them the GM open type, in my car's air box and regardless of which sensor I connect MS to, the IAT readings will start jumping all over the place when IAT gets fairly hot (+- 50degC). Up to about 40degC the readings are quite stable.
My CLT sensor and TPS are both using the same ground (directly back to MS) as the IAT and are 100% stable with 0 noise.
I read somewhere that the people support the IAT sensor with silicone because they tend to fail with vibration but I find it hard to accept that they are SO WEAK that even the vibrations in the air box would cause both these sensors to fail.
Are these GM sensors really that unreliable?
Unstable IAT reading with GM sensor
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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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Philip Lochner
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Unstable IAT reading with GM sensor
Best regards
Philip
'74 Jensen Interceptor Mk3 (MS-2 EFI, GPIO + GM 4L60e)
'80 Jaguar XJS 5.3L V12* (MS-2 EFI + dual EDIS-6)
and about 10 others.
Philip
'74 Jensen Interceptor Mk3 (MS-2 EFI, GPIO + GM 4L60e)
'80 Jaguar XJS 5.3L V12* (MS-2 EFI + dual EDIS-6)
and about 10 others.
Re: Unstable IAT reading with GM sensor
Hi! check the values of the resistance vs. temperature configuration ( Mega therm for MS-I or tools>thermistor calibration in Megatune for MS-II). Good luck!
Fiat Uno SCR >> 45mm ITBs, 12.10 Circelli cam, DGM cylinder head, Megasquirt
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Matt Cramer
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Re: Unstable IAT reading with GM sensor
That's not something we see very often. Check the reading on it with a volt meter; does the volt meter measurement look stable?
