Question about 1992 Mercury Capri

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Where is my IAT sensor? I bought a X2 Module and they do work because my friend has one and dyno showed an increase from 228hp to 256hp

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  • ranthax18 Sep 30, 2009

    Im not removing it im splicing into the wires not cutting the signal



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  • Mercury Master
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If its the air temp sensor removing it or unplugging it MAY do a few things depending on the type of sensor it is. Most send a signal to the computer in terms of resistance (ohms) that changes with temp. That signal is used by the PCM in conjunction with others (MAF O2s MAP) to determine timing and fuel requirements. If you unplug the IAT sensor the computer (on most GM cars) will see an open or infinite resistance and give the lowest possible temp input to the computer for air temp. That can increase timing across the RPM range sometimes giving a few extra ponies. It can also lead to detonation if too much timing is present.

I hooked up a 10k ohm potentiometer to my IAT sensor so I can dial in the temp I want. If I want some timing ****** for nitrous I dial it so the computer sees 185 degress F and it takes 2 or 3 degrees total timing out. For more timing I dail in 20 degrees F and it will advance it some. Works good.

This may be totally different on Capri but most IAT sensors work the same. As for changing the reading on the IAT will not give a 28 HP difference since the ECM will only give a given default and P.S the Potentiomete is about $6.00 for a good one at Radio Shack. 

Posted on Sep 30, 2009


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I have a 2007 chev Uplander have a code P0116

You can drive it a day or two before it resets because DTC P0116 is a Type B DTC. Which means this DTC runs only once a drive cycle . Where as a type A DTC runs continuous.
Conditions for Setting the DTC
The control module detects a temperature difference between the ECT sensor and the intake air temperature (IAT) sensor of more than 100°C (180°F) at start-up.


The control module detects a temperature difference between the ECT sensor and the IAT sensor of more than 15°C (27°F) and the time elapsed cranking the engine without starting is more than 5 seconds.


The control module detects a temperature difference between the ECT sensor and the IAT sensor of more than 15°C (27°F). The vehicle must then be driven for 5 minutes over 40 km/h (25 mph). If the IAT sensor temperature decreases more than 5°C (9°F), an engine block heater was detected and the test is aborted. If the IAT sensor temperature does not decrease, an engine block heater was not detected and DTC P0116 will set.

Diagnostic Aids
Inspect the ECT sensor terminals for corrosion and for engine coolant leaking through the sensor. Engine coolant that is leaking through the sensor will create a high resistance short to ground. This condition results in less voltage on the ECT sensor signal circuit, which is interpreted by the ECM as a warmer ECT.

An IAT sensor that is skewed colder at various ambient temperatures due to greater resistance than is normal will increase the range between these two sensors. Measure and record the resistance of the IAT sensor at various ambient temperatures, then compare those measurements to the Temperature vs Resistance table. Refer to Temperature Versus Resistance .

A slight to moderate resistance in the IAT sensor signal circuit or low reference circuit will increase the range between these two sensors. This condition results in a greater voltage on the IAT sensor signal circuit, which is interpreted by the ECM as a colder IAT.

Circuit/System Verification

  1. Turn OFF the ignition.
  2. Inspect the cooling system surge tank for the proper coolant level. Refer to Cooling System Leak Testing and Cooling System Draining and Filling .
  3. If the ignition has been OFF for 8 hours or more, the ECT and the IAT should be within 15°C (27°F) of each other and also the ambient temperature. Turn ON the ignition, with the engine OFF, and use a scan tool to observe the IAT and the ECT sensor parameters.
  4. Operate the vehicle within the Conditions for Running the DTC. You may also operate the vehicle within the conditions that you observed from the Freeze Frame/Failure Records data.
Circuit/System Testing
  1. Ignition OFF, disconnect the harness connector at the ECT sensor.
  2. Ignition OFF for 90 seconds, test for less than 5 ohms of resistance between the low reference circuit terminal A and ground.
  3. ?‡'
    If greater than the specified range, test the low reference circuit for an open/high resistance. If the circuit tests normal, replace the ECM.

  4. Ignition ON, verify the scan tool ECT parameter is less than -39°C (-38°F).
  5. ?‡'
    If greater than the specified range, test the signal circuit terminal B for a short to ground. If the circuit tests normal, replace the ECM.

  6. Install a 3-amp fused jumper wire between the signal circuit terminal B and the low reference circuit terminal A. Verify the scan tool ECT parameter is greater than 149°C (300°F).
  7. ?‡'
    If less than the specified range, test the signal circuit for a short to voltage or an open/high resistance. If the circuit tests normal, replace the ECM.

  8. If all circuits test normal, test or replace the ECT sensor.

Feb 08, 2016 | Cars & Trucks

1 Answer

My vehicle starts but when I step on the gas it dies.

After it starts does it idle good before you step on the gas , will it keep idling before you step on the gas ? Is the check engine light on ? What engine does the vehicle have ? This vehicle came with 5.0 L ,5.7L ,6.5 L , 7.4 L engines ,gas or diesel ? Three specific data sensors provide the vehicle control module (VCM) with the basic information for the fuel management portion of its operation. Three specific signals to the VCM establish the engine speed and air density factors. The engine speed signal comes from the distributor high resolution circuit. The VCM uses this information to determine engine speed (RPM). Air density is derived from intake air temperature (IAT) and manifold absolute pressure (MAP) sensor inputs. The IAT sensor measures the air temperature that is entering the engine. The IAT signal works in conjunction with the MAP sensor to determine air density. As the intake manifold pressure increases, the air density in the intake manifold also increases and additional fuel is required. This information from the IAT and MAP sensors is used by the VCM to control injector pulse width. One of these sensors could be bad or a plugged catalytic converter .

Dec 27, 2014 | 1998 GMC Suburban

1 Answer

Installed an aftermarket air filter kit and now have a code of PO113

Have you tested your IAT (Intake Air Tempature sensor) ? Did you install in your new cold air intake? The P0113 code sets when it senses an air temp of -31 degrees F for more than 5 second . If you test your IAT with an ohm meter it should have continuity at room temp. the warmer it is the less resistance it should have. the colder it is the more resistance it should have. If you have no continuity the IAT is bad and needs replacing.

Jan 26, 2012 | 2011 Chevrolet Camaro

2 Answers

MOtor is racing code comes upPO113

P0113 - Intake Air Temperature Circuit High Input
The powertrain control module (PCM) monitors the temperature of the air entering the engine. The PCM supplies a 5 volt reference voltage to the Intake Air Temperature (IAT) sensor. The IAT is a thermistor that varies resistance based on temperature. As the temperature increases, resistance decreases. Low temperature results in a high signal voltage. When the PCM sees a signal voltage higher than 5 volts, it sets this P0113 check engine light code.

Potential Symptoms: There will likely be no symptoms other than illumination of the Malfunction Indicator Lamp (MIL - Check Engine Light / Service Engine Soon).

Causes: A code P0113 may mean that one or more of the following has happened:
Internally failed IAT sensor
Faulty connection at IAT sensor
Open in IAT ground circuit or signal circuit
Short to voltage in IAT signal circuit or reference circuit
IAT harness and/or wiring routed too close to high-voltage wiring (e.g. alternator, spark plug cables, etc.)
Faulty PCM (less likely but not impossible)

Possible Solutions:
First, if you have access to a scan tool, is there an IAT reading? If the IAT reading is logical then the problem is likely intermittent. If the reading is less than -30 degrees, unplug the connector. Install a jumper wire between the harness connector signal and ground circuits. The IAT temperature reading on the scan tool should be maxed out at the high end. For example it should be 280 degrees Farenheit or higher. If it is, the wiring is okay, and it may have been the connection. If it isn't install the jumper wire between the IAT signal circuit and the chassis ground.

If now the IAT reading on the scan tool is maxed out then check for an open in the IAT ground circuit. If you get no reading at all on the scan tool, it's likely that the sensor signal is open or the 5 volt reference is missing. Check using a DVOM (digital volt ohm meter) for a 5 volt reference. If it's there, then unplug the connector at the PCM and check for continuity on the IAT signal circuit between the PCM connector and the IAT connector.

Hope this helps (remember to rate this answer).

May 06, 2011 | Saturn LW Cars & Trucks

1 Answer

Hello my check engine light is on i went to local parts house had them read the code low input voltage in the iat sensor so i bought a new one had the code cleared and before i left parking lot light was...

Keep in mind that the IAT (intake air temperature) sensor simply measures the temperature of air that is entering the engine. Intake air temperature is important because the higher the intake air, the higher the combustion temperatures. High combustion temperatures result in increased Nox (Nitrogen oxides) emissions. To keep these higher temps from causing increased combustion temps, the intake air tubing should be intact, allowing the engine to "breathe" air that isn't sampled from the engine compartment. The IAT measures air temp by using a thermistor, or a thermometer of sorts. The thermistor is supplied 5 volts reference voltage from the PCM (powertrain control module) and a ground. Usually, when the air temperature is cold the resistance in the thermistor is high and when the air temperature is warmer, the resistance decreases. This change in resistance changes the 5 V reference from the PCM, thereby informing the PCM of the temperature of incoming air. If the PCM notices that the incoming air temp is unusually high, say, 300 degrees, when the engine temp is still relatively low, it will set a P0112.

Symptoms: There may be no noticeable symptoms of a P0112 code other than an MIL (Malfunction Indicator Lamp). However, a emissions test may reveal higher Nox readings depending on the type of IAT failure. Or the engine may ping under load, depending on the type of IAT failure.

Causes: Usually the P0112 is caused by a bad IAT (internally shorted or open or otherwise damaged), but it could also be:
* No reference voltage to the IAT sensor due to an open wire
* Excessively high intake air temperatures
* Short to ground on signal circuit
* Damaged IAT connector
* Bad PCM

Possible Solutions:
Hook up your scan tool or code reader and read the IAT reading. With a cold engine, the IAT should roughly match the coolant reading, since both will read ambient temperature. If the IAT is reading excessively high, check the IAT connector for damage. If you find none, unplug the IAT sensor and recheck the reading. It should now read the minimum, around -20 deg. If it does, then replace the IAT sensor. But, if the reading is still high, unplug the sensor and check for resistance across the two wiring harness terminals. If there is infinite resistance, then the PCM itself is bad. If the resistance isn't infinite, then check and repair the short to ground on the signal circuit.

Keep us updated.

Feb 16, 2011 | Chevrolet C3500 Cars & Trucks

3 Answers

Where is my IAT sensor located? Its a 1992 Mercury Capri non Turbo. I bought a Performance module and its splices into the two IAT wires. Is

Save your money and don't attach the module, it does not work. It only works during idle and after that the O2 and MAP sensors take over to control the air fuel ratio and timing. Take note that if there is a conflict with the program to your ecm's parameters, your engine will run under limp mode default which would result in less HP and performance. Good luck and if you need ore performance just spend the extra to have your car Dyno Turned. 

Sep 30, 2009 | 1992 Mercury Capri

1 Answer

Cant find IAT on 99 jeep grand cherokee laredo...

Intake Air Temperature sensor.

It has to be installed ->BEFORE the throttle body, to sense the density of the air entering the intake manifold, based upon intake manifold temperature.

It provides an input voltage to the PCM, (Powertrain Control Module)
It's a Negative Thermal Coefficient sensor, (NTC. It uses two wires)

Meaning, as intake manifold temperature Increases, resistance in the sensor increases.
(Less voltage)
As the temperature Decreases, resistance in the sensor Decreases. (More voltage)

The PCM then uses this input to calculate the following;
1.Injector-Pulse Width
2.Adjustment of spark timing.

Just thought you might want to know.

Wish I knew what size your engine is.
A. The IAT in the 3.7 Liter engine, is located in the Left side, {Drivers} of Intake Manifold Plenum. (BEFORE the throttle body)

See that plastic 'snorkel' tube, that comes from the air cleaner housing, and goes to an oval shaped aluminum housing? That oval shaped, {On the end}, housing is the Intake Manifold Plenum.

The 4.7 Liter engine has the IAT in the same place.
The 4.0 Liter has the IAT installed INSIDE, the Front of the Intake Manifold Plenum. (Before the throttle body)

The color of the two wires are Brown with a Yellow stripe, (Thick 20 gauge wire), and Black with a Red stripe. (Thinner wire. 18 gauge)

Aug 07, 2009 | 1999 Jeep Cherokee

1 Answer

Cnt find iat sensor on 2005 chevy cobalt ss supercharged

The IAT sensor is most of the time located along the intake tube right after Between the throttle body and MAP sensor. Just follow your air intake tube from your air filter housing to the Throttle body.
Good luck. 

Apr 09, 2009 | 2005 Chevrolet Cobalt

1 Answer

I want to know where exactly the IAT sensor is on a 94 cavalier

The IAT sensor can be found on the intake tube that runs just before the throttle body. But the resistor doesn't do anything for the engine after 1000 RPM. With the reading from the MAP and O2 sensor's they control the amount of fuel in your engine after the engine is running. The IAT does play a roll in your Air Fuel Ratio but not much, only when it's running at idle. Sorry for the bad new's my friend, if you want to may a big difference, take it to a shop the can flash your computer and dyno tune it from your shift points to your rev limit. Good luck

Apr 06, 2009 | 1994 Chevrolet Cavalier

1 Answer

IAT sensor wires

Those chips are not chips just a 5 cent resistor to alter the IAT (Intake Air Temperature) signal to the PCM (Powertrain Control Module), the idea is that the engine control computer thinks it is getting colder air than it really is and slightly increases spark advance, u will feel no difference in power but u may gain 1 MPG in fuel economy, so u decide. One last note they are illegal in most states that do emission tests, it alters the factory controls.

Oct 29, 2008 | 2007 Chevrolet Colorado (Extended Cab) New...

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