is the ACT SENSOR IMPORTANT ENOUGH TO LEAVE OFF?

vicma762004 · March 11th, 2007, 01:59 PM

what happens if the air charge sensor is not connected. when i bought my car it came unplugged and really dont know where the wire going out is. the plug is on the air tube but the conection going out is nowhere to be found. my car ever since i bought it has been running rough, idling rough, misfiring. the car is running better after changing fuel,air filter, plugs, plug wires, cleaned maf and throttle body.

TENGRAM · March 11th, 2007, 03:41 PM

without the ACT the ECM will use other sensors to "guess" at what temp the air is. the engine will not run optimally w/o the ACT. get one and hook it up. my2cents

Zak · March 11th, 2007, 05:46 PM

Bad ignition timing is what you get with a faulty or missing ACT sensor.. maybe the EEC was depending on the TPS, MAF & water temperature sensors to do the guess work as mentioned. It's strange if your idle behavior wasn't noticeable.

sb2f5marine69 · March 11th, 2007, 08:08 PM

yep it will have a bad a/f ratio

Zak · March 11th, 2007, 11:29 PM

Oh sorry.. you did mentioned it was idling & running roughly.

sb2f5marine69: are you sure about the a/f ratio? usually, it's the MAF sensor that adjusts AFR.. ACT is in charge of controlling ignition timing according to air density which is affected by temperature. This is why it is relocated to the pressure side in forced induction applications as compressed air rises in temperature therefore requires some retard accordingly. I think.

sb2f5marine69 · March 12th, 2007, 02:46 AM

yes but it uses that in coming air as well to help determin air fuel ratio. also look in a haynes manual for a break down

Bill · March 12th, 2007, 05:01 AM

it measures the temp. of the air entering. and it does have an impact on the A/F ratio. sends the temps of the air to the Computer
i was having problems in my 92 5.0 cause mine went bad. but in my 92 its not on the air tube. its in the lower intake.

vicma762004 · March 12th, 2007, 02:10 PM

ok thnx guys so in other words locate it and replace it right?

my problem is that the plug id on the intake tube but the wire going out to the computer of where ever it goes is M.I.A
how would i go by rplacing it?

TENGRAM · March 12th, 2007, 03:03 PM

the wires should come from the injector harness. scope it out and see if you can find them. if not you could run a new signal wire from pin 25 at the ECM to the ACT and hook the black wire (SigRTN) to either the ECTs black wire or run it straight to pin 46 at the ECM. check this diagram (ACT= IAT or Intake Air Temp Sensor):

sb2f5marine69 · March 12th, 2007, 04:31 PM

The act snsor :This measures the temperature of the air entering the engine. Which impacts the fuel ratio; the cooler the incoming air is the denser it is. Denser air can utilize more fuel, giving us even greater accuracy in obtaining our desired air to fuel ratio.

sb2f5marine69 · March 12th, 2007, 04:31 PM

straight out of the ford manual

March 11th, 2007, 03:41 PM	#2
TENGRAM Hardcore Enthusiast Join Date: Jun 2006 Posts: 1,027	without the ACT the ECM will use other sensors to "guess" at what temp the air is. the engine will not run optimally w/o the ACT. get one and hook it up. my2cents __________________ 89 GT t5 3.73 www.my5oh.com/

March 12th, 2007, 05:01 AM	#7
Bill Moderator Join Date: Aug 2005 Posts: 1,331	it measures the temp. of the air entering. and it does have an impact on the A/F ratio. sends the temps of the air to the Computer i was having problems in my 92 5.0 cause mine went bad. but in my 92 its not on the air tube. its in the lower intake. __________________ Too often, We lose sight of life's simple pleasures. Remember, when someone annoys you it takes 42 muscles in your face to frown, BUT, it only take 4 muscles to extend your arm and bitch-slap that Mother@#?!&! upside the head!!

March 12th, 2007, 02:10 PM	#8
vicma762004 Newbie Join Date: Mar 2007 Location: McALLEN, TX. Posts: 11	ok thnx guys so in other words locate it and replace it right? my problem is that the plug id on the intake tube but the wire going out to the computer of where ever it goes is M.I.A how would i go by rplacing it? __________________ 1994 GT VERT MAC HEADERS MAC H PIPE DYNOMAX RACE BULLETS CUSTOM CAI & FUZZY NUTS

March 12th, 2007, 03:03 PM	#9
TENGRAM Hardcore Enthusiast Join Date: Jun 2006 Posts: 1,027	the wires should come from the injector harness. scope it out and see if you can find them. if not you could run a new signal wire from pin 25 at the ECM to the ACT and hook the black wire (SigRTN) to either the ECTs black wire or run it straight to pin 46 at the ECM. check this diagram (ACT= IAT or Intake Air Temp Sensor): __________________ 89 GT t5 3.73 www.my5oh.com/

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March 11th, 2007, 05:46 PM	#3
Zak Regular Join Date: May 2006 Posts: 253	Bad ignition timing is what you get with a faulty or missing ACT sensor.. maybe the EEC was depending on the TPS, MAF & water temperature sensors to do the guess work as mentioned. It's strange if your idle behavior wasn't noticeable.

March 11th, 2007, 08:08 PM	#4
sb2f5marine69 Regular Join Date: Feb 2007 Location: Jville,NC Posts: 197	yep it will have a bad a/f ratio

March 11th, 2007, 11:29 PM	#5
Zak Regular Join Date: May 2006 Posts: 253	Oh sorry.. you did mentioned it was idling & running roughly. sb2f5marine69: are you sure about the a/f ratio? usually, it's the MAF sensor that adjusts AFR.. ACT is in charge of controlling ignition timing according to air density which is affected by temperature. This is why it is relocated to the pressure side in forced induction applications as compressed air rises in temperature therefore requires some retard accordingly. I think.

March 12th, 2007, 02:46 AM	#6
sb2f5marine69 Regular Join Date: Feb 2007 Location: Jville,NC Posts: 197	yes but it uses that in coming air as well to help determin air fuel ratio. also look in a haynes manual for a break down

March 12th, 2007, 04:31 PM	#10
sb2f5marine69 Regular Join Date: Feb 2007 Location: Jville,NC Posts: 197	The act snsor :This measures the temperature of the air entering the engine. Which impacts the fuel ratio; the cooler the incoming air is the denser it is. Denser air can utilize more fuel, giving us even greater accuracy in obtaining our desired air to fuel ratio.

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