air charged temp sensor
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New User
Joined: Feb 2004
Posts: 9
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From: Iowa
air charged temp sensor
I have an 87 302 that is real sluggish on take-off and sort of pops also someone told me to check the air charged temp sensor along with a few other things what is this and how do I check it? thanks
Lead Driver
Joined: Nov 2002
Posts: 9,557
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From: Concord, NC
You can measure the resistance of the sensor to check it. A Haynes manual will have the resistance values - I can't remember them right off hand. The ACT is in the intake manifold between the fuel injectors for cylinders 5 and 6.
Lead Driver
Joined: Feb 2000
Posts: 5,374
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From: Palm Bay, Florida
Please forgive my ignorance, but what exactly is the air box? I have looked on the intake manifold between the number 5 and 6 cylinder injectors, and it doesn't seem to be there.
I have bought a new sensor and it looks like the coolant temp sensor execpt it has an air gap kind of tip to it, I guess thats why they call it an air charged temp sensor.
I have bought a new sensor and it looks like the coolant temp sensor execpt it has an air gap kind of tip to it, I guess thats why they call it an air charged temp sensor.
Tuned
Joined: Mar 2004
Posts: 281
Likes: 1
From: Petersburg, MI
I don't think they moved it from the intake manifold because it is a resistor that changes value with engine temp. If it was in the air box it wouldn't be affected by engine temp. With the key forward you want about 5 volts at the connector. To check the sensor you want to check it cold first then warm the motor up to NOT and check it again. When it's cold the ACT sensor should have a high resistance. When the motor is hot it should have a low resistance.
Senior User
Joined: Jan 2003
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If your engine is mass air, then the air temp sensor was moved to the air filter box, it's on one side of it, just can't remember exactly where. Buy the way, it doesn't measure engine temperature, it measures incoming air temperature.
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Lead Driver
Joined: Nov 2002
Posts: 9,557
Likes: 44
From: Concord, NC
Yes, the air filter housing is what I meant by airbox. It is actually better for the sensor to be mounted there because it isn't affected by engine temperature like it is in the intake manifold. It's an air temp sensor, so it should have a resistance that corresponds to the ambient air temperature when you test it.
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Tuned
Joined: Mar 2004
Posts: 281
Likes: 1
From: Petersburg, MI
The Haynes manual tells you exactly what I said that the resistance will(should) change from a cold engine to a warmed up one. I'm sure it's because of the SD vs MAF. With MAF you're actually measuring the mass of the air flowing into the motor so it makes sense that you would want the act sensor close to the MAF sensor. SD is more of a calculation/estimate as to how much air is flowing. I assume that since the MAP sensor is measuring Manifold Pressure the computer needs to know the temp of the air in the manifold for an accurate calculation. Make sense to me but I don't for for sure. If anybody has a better explanation (or the right one if I'm wrong) I welcome it.
Lead Driver
Joined: Nov 2002
Posts: 9,557
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From: Concord, NC
Originally Posted by RLKBOB
I assume that since the MAP sensor is measuring Manifold Pressure the computer needs to know the temp of the air in the manifold for an accurate calculation
Lead Driver
Joined: Feb 2000
Posts: 5,374
Likes: 46
From: Palm Bay, Florida
Guys, I found my sensor actually yesterday, it is in the air box in the side closest to the firewall, I've got a new one ordered and will report IF this happens to fix my hard start trouble as of late. Thanks!