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: Which is which? MAP and IAT sensor... Bumpin' Yota 10-29-2004, 02:30 PM Which is which? MAP on the right? http://www.dieselplace.com/forum/uploads/BumpinYota/2004-10-29_112949_low_res_map___iat.jpgEdited by: Bumpin' Yota Turbine Doc 10-29-2004, 02:48 PM MAP left (black) IAT right 0lee 10-29-2004, 04:11 PM You've got some interesting read cables back there. What are they for? Juancho 10-29-2004, 04:25 PM Look like power for an aftermarket stereo to me. Bumpin' Yota 10-29-2004, 06:05 PM lol close, actucally that is some 1/0 connecting the two grounds on each side of the head. I cut the 1/0 a tad long so it snakes around the top of the fuel filter. As soon as I can get more money ill be buying some loom to protect that wire and the other 1/0 ground from the battery to alt chassis. Actually the sound system is only supported by 2 runs of 4ga. Out of curiosity what output does the IAT sensor have? Is it a resistor whose impeadance swings with temp, or does it output a voltage pending the temp? Pending the type of output it has I bet you could put a guage on it to get an idea of what the IATs are... 0lee 10-29-2004, 09:54 PM > actucally that is some 1/0 connecting the two grounds on > each side of the head. Hm, somehow sounds like a good idea :) > I bet you could put a guage on it to get an idea of what > the IATs are... I've thought about that, too, but the gauge could interfere with the output, i. e. lowering the resistance or decrease the voltage. But it would be nice to have such a thing. shakmobil 10-29-2004, 10:57 PM Out of curiosity what output does the IAT sensor have? Is it a resistor whose impeadance swings with temp, or does it output a voltage pending the temp? Pending the type of output it has I bet you could put a guage on it to get an idea of what the IATs are... Resistors in DC environment don't have impedence, at least not supposed to.http://www.dieselplace.com/forum/smileys/smiley2.gif It is probably a thermoresistor (http://encyclopedia.thefreedictionary.com/Thermoresistor), which is an N-P junction. Bumpin' Yota 10-30-2004, 01:51 AM Out of curiosity what output does the IAT sensor have? Is it a resistor whose impeadance swings with temp, or does it output a voltage pending the temp? Pending the type of output it has I bet you could put a guage on it to get an idea of what the IATs are... Resistors in DC environment don't have impedence, at least not supposed to.http://www.dieselplace.com/forum/smileys/smiley2.gif... dont have impeadance swings you mean? Cuz im almost positive that a resistor will meter out a DCR when measured on a DMM but yeah I meant a thermoresistor that changes its value in accordance to the temperature....hmmm in that case a DMM could be used to get the raw data and it shouldn't change the impeadance that much being that it only has 0.3 or so ohms of impeadance...Edited by: Bumpin' Yota Enduroracer 10-30-2004, 09:19 AM It's what is referred to as an NTC (negative temperature coefficient resistor), where the internal element will have a much greater resistance cold than not. Memory serving, it's up around 10K ohms at 0 deg F and transitions to around 200 ohms during hot soak (engine shut off for a few minutes after running hard). Very easy to test, simply remove it and drop it in your freezer. Remove it and connect an ohmmeter across the terminals. Let it warm to ambient temperature while watching the meter. Resistance should change smoothly and should never drop to zero or infinite as the temperature is changing. Continue by warming it with a hair dryer and watching the meter....again being sure that there are no spikes in the reading. Spikes=bad. Jim quantum mechanic 10-31-2004, 06:25 PM Yota, I sure thought it made a difference on my 94 when I cut out the cast web. you only have to loosen the 6x10 mm on top, the 5/16 clamp and unplug the MAP and IAT that you are now familiar with to see if there's a cast web inside(boss says yes). Bumpin' Yota 10-31-2004, 08:30 PM What should I use to remove the webbing with, an angle grinder for most of it? Is this thing aluminum or some kind of ferrous metal? Also, since I have the L65 engine, do i have anything to worry about as far as capping off things like the L56 motors w/EGR do? Lastly, Ill need a new intake gasket right? quantum mechanic 11-05-2004, 10:19 AM I scored the web around the edge with a 4 1/2" cut off tool and then tapped it with a ball peen hammer to dislodge chunks of aluminum, then cleaned it up with the cut off tool and sprayed it liberally with carb cleaner to remove the bits and grit. Nothing else from the l56 shoud be there.Edited by: quantum mechanic | ||