It gives the ECM info on the tempature of the engine (the ECM has no knowlege of the sensor on the head that goes to the guage) The ECM uses the temp info for fuel management.
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11:40 PM
May 26th, 2005
2000RagTop Member
Posts: 3999 From: Sussex, (Milwaukee) Wi. USA, Earth Registered: Jun 2003
It gives the ECM info on the tempature of the engine (the ECM has no knowlege of the sensor on the head that goes to the guage) The ECM uses the temp info for fuel management.
So......my temp guage in my car could be reading, say 200 degrees, and the ECM temp sensor could be reading a different temp?? say 175 degrees.......??
The reason I'm asking is my guage in my car does read around 200-210 but when I run Winaldl, it's only showing aroumd 175 degrees.
[This message has been edited by 2000RagTop (edited 05-26-2005).]
So......my temp guage in my car could be reading, say 200 degrees, and the ECM temp sensor could be reading a different temp?? say 175 degrees.......??
The reason I'm asking is my guage in my car does read around 200-210 but when I run Winaldl, it's only showing aroumd 175 degrees.
One of the sensors is bad, that's for sure, either that or the guage is inaccurate. The ECM doesn't see and doesn't care about the guage sensor, but if the ECM sensor is bad, reading low, it will cause the ECM to deliver more fuel than needed, especially when cold.
The temp gauge is only correct in telling you the engine is iced over (under 100F) or near thermal melt down (over 260F). Anywhere else is wrong. Look at the scale. 120 degrees to half scale and 40 degrees to full scale.
If you want, scan it and reposition the needle to read 220 when the scanner reads 220F.
But I will guarentee you none of the numbers on the scale match the actual temperature.
Hi, Jazzman said if the ECM sensor is bad it will deliver more fuel espesially when engine is cold, what symptoms would the engine/car have ??? Ohh sorry not trying to steal yor thread, but I think I`m having this problem and can`t quite put the actions of the engine and running conditions in to the proper words.. Thanks
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07:32 AM
buddycraigg Member
Posts: 13620 From: kansas city, mo Registered: Jul 2002
Look at the scale. 120 degrees to half scale and 40 degrees to full scale....I will guarentee you none of the numbers on the scale match the actual temperature.
I don't know how to read it based on the way the markings are layed out. The firebird gauge has markings such that you can read it, I guess they just got lazy on the Fiero.
The gauge is not linear. Even the senders aren't linear but the ECM does have a look up table to get the reading pretty close.
The gauge isn't even a rough approximation. The sender makes the needle move but where to is not exact. As I said in both threads, I make the gauge match the ECM at 220F. Below that who cares and above that I want to watch it. 220F is nothing for the engine but adjusting the gauge for 260 is tricky since you can't readily get the engine up that high for the ECM to read.
