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30-05-2008, 04:20 PM | #1 | ||
Regular Member
Join Date: Oct 2005
Location: Townsville
Posts: 260
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Here is my best guess on how the IAC valve operates after reading my manual and a bit of detective work. As we all know the IAC valve controls the idle. It does this by opening and closing an air bypass to the throttle butterfly. My manual says that the idle is factory set but to adjust it you should disconnect the IAC valve cable and set the idle to about 700 rpm. This suggests that when the IAC is closed the idle shoule be about the 700 RPM mark. When you turn your steering wheel the power steering sensor tells the IAC valve to open and increace the revs slightly to compensate for extra load. Next is the temp sensor. When the engin is cold the temp sensor tells the IAC to open slightly to allow more air and therefor increace revs till the engin heats up. Then the temp sensor allows the IAC to go back to norm. The aircon sensor works much like the power steering and activates when aircon cycles.. Can somebody tell me what the TMAP and temp sensor does ?
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30-05-2008, 04:58 PM | #2 | ||
Smile
Join Date: Dec 2004
Location: Merrylands Sydney
Posts: 8,541
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Tmap sensor measures manifold absolute pressure and air intake temperature. It is used as a reference for ignition and fuel.
Stav
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31-05-2008, 08:50 AM | #3 | ||
Boost Addict
Join Date: Jan 2005
Location: North Brisbane
Posts: 1,151
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there are two temp sensors, coolant temp sensor at the back of your head, which does ur temp gauge on the dash, coolant temp correction (ie cold start etc) and intermittend cylinder shut off when over heating. second is teh air temp sensor under ur throttle body, which controls the air tem fuel and ignition correction (ie colder air is denser and req more fuel etc)
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N12 Pulsar - sold Gen1 Liberty Turbo - sold VP Commodore Turbo - sold LN65 Hilux Turbo - sold EL31 Corolla Turbo - sold Ford AU Ute Turbo - sold Ford AU XR8 Sedan - 5.4l V8 Turbo (in the build) Ford BA XR6T Ute - daily driver Ford FG XR6T Sedan - cruiser do you see a general trend? I DO Can't live with it, can't live without it! |
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02-06-2008, 09:23 AM | #4 | |||
Regular Member
Join Date: Oct 2005
Location: Townsville
Posts: 260
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Quote:
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02-06-2008, 01:59 PM | #5 | |||
Sly like a G6
Join Date: Jun 2006
Location: Hunter Valley Whine Country
Posts: 1,808
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Quote:
The temp sensor under the TB on the I6 is the TMAP. Maybe the V8 has an IAT? (Intake Air Temp sensor)
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The Frankenfalcon... AU1.5 Wagon, BA brakes, AU2 booster, BA2 XR6T engine, stock from airbox to turbo, 8psi/98 octane tune 240RWKW, BF XR6T cat, quiet 3" zorst, Pex BSO660 & BSO439 mufflers, 84 db, built BTR box, 3.08 LSD, Emer SVI LPG, AU1 XR8 alloys, Momo wheel, JVC KDR746BT head unit, Aerpro steering wheel control wiring. Sleeper, anyone? |
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02-06-2008, 03:25 PM | #6 | ||
Regular Member
Join Date: Oct 2005
Location: Townsville
Posts: 260
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Sorry Sly, I also have an 98 model XH ute 4L 6 cyl that has everything exactly the same under the bonnet as my mates AU ser 1 ute. I would be swapping parts with his car to find out whats wrong with mine but he was t boned the other day and its in the panel beaters.
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02-06-2008, 06:09 PM | #7 | ||
Sly like a G6
Join Date: Jun 2006
Location: Hunter Valley Whine Country
Posts: 1,808
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I'd have thought the XH had separate IAT and MAP sensors like the other E-series engines. I know the '98 EL's used a "hybrid" engine that was the AU head & valvetrain on the EL block, but AFAIK this engine still used the EL ECU and sensors. The coolant temp sensor under the thermostat isn't there on an AU. As EvilChief said it's behind cylinder #6 in the head.
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The Frankenfalcon... AU1.5 Wagon, BA brakes, AU2 booster, BA2 XR6T engine, stock from airbox to turbo, 8psi/98 octane tune 240RWKW, BF XR6T cat, quiet 3" zorst, Pex BSO660 & BSO439 mufflers, 84 db, built BTR box, 3.08 LSD, Emer SVI LPG, AU1 XR8 alloys, Momo wheel, JVC KDR746BT head unit, Aerpro steering wheel control wiring. Sleeper, anyone? |
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03-06-2008, 01:13 PM | #8 | ||
Regular Member
Join Date: Oct 2005
Location: Townsville
Posts: 260
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I should be able to tell you after this weekend. My mate gets his ute back and I will be swapping everything that might control the IAC valve. I can tell you that it is nothing like a 97 model XH under the bonnet and from a quick glance it was the same as the AU
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