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Bad map sensor


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If you ran the car on a scanner, and that's the answer that Coded, then replace the MAP. If you are guessing, then get a free scan at one of the big autoparts chains.

Resubmit details about the Year, Model, and engine size. There are some engines with intake runners, some motors with "Cam Phasers" , and various features for different engines.

You should check tire pressure and jack up the wheels of the vehicle to see if brakes are dragging. Clean oil, filter, and air filter can help.

Remember to access mileage under equal conditions. Same roads, same traffic, same weather. Be sure that gas was not diluted with E85 which will not give you the same mileage.

Posted on Apr 17, 2014


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Posted on Jan 02, 2017

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SOURCE: Where is MAF/MAP on Mitsubushi 4D56 turbo diesel?

I suggest download this specific Factory Service Manual: Mitsubishi FSM Engine 4D56-25-diesel

Hope this helps; also keep in mind that your feedback is important and I`ll appreciate your time and consideration if you leave some testimonial comment about this answer.

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Posted on Feb 13, 2012

  • 101 Answers

SOURCE: poor fuel economy and missing

oxygen sensor likely

Posted on Oct 15, 2009

  • 69 Answers

SOURCE: trouble shoot low fuel economy

try any of the following::::new spark plugs, fuel injecter clean(if it has any), using cruise control on long flat roads,new fuel filter, new after market air filter, pcv valve helps a little.. very easy to change to.......thats all i can think of..

Posted on Jul 20, 2010

Testimonial: "I'll check plug gaps (?) and double check the dates of my fuel filter and air filter. I keep the box tab with the date and mileage on them. Could an EGR also be a problem. The engine has no signs if trouble but just seems not 100%. Thanks for the help, John"

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MAP sensor fail

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Could be a bad one even if its new it happens

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What is the function of map sensor


Jun 08, 2013 | 1992 GMC Sierra

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P0107 gm code

What does that mean?

The Manifold Absolute Pressure (MAP) sensor responds to changes in the intake manifold pressure (vacuum). 5 Volts is supplied to the sensor from the PCM (powertrain control module). Inside the MAP sensor is a resistor that moves in relation to manifold pressure. The resistor varies the voltage between about 1 volt to 4.5 volts (depending on engine load) and that voltage signal is returned to the PCM to indicate manifold pressure (vacuum). This signal is essential for the PCM to determine fuel delivery. A P0107 DTC is set when the PCM sees that the MAP signal voltage is less than .25 volts which is too low.
FB.init("dd7d9e9681341cde77587bc6a2029f6f"); on Facebook Potential Symptoms

Anytime the MAP sensor signal is low the vehicle will likely have a very difficult time starting. Other symptoms may include:

  • Hard to start
  • Long cranking times
  • Sputtering/missing
  • Blowing black smoke
  • Poor fuel economy
  • Dies intermittently
  • MIL(Malfunction Indicator Lamp) illumination

The causes of a low MAP sensor signal circuit (P0107) could be any of the following:

  • Bad MAP sensor
  • Open or short in the signal circuit
  • Open or short in the 5 Volt reference circuit
  • Ground circuit open or shorted
  • Bad PCM

Jun 22, 2012 | 2008 Pontiac G6

1 Answer

Why my prado smoke black too much

Black smoke always indicates that there is problem with the air/fuel mixture. This would have an great impact on the fuel economy.The possible faulty parts can be MAP sensor or the TPS or the O2 sensor could be bad too. There are just too many things that it could be.

Mar 17, 2011 | 1999 Toyota Land Cruiser

1 Answer

Check engine light comes on . read out says map sensor. what is map sensor and what is its job. and how long to let it go

the MAP sensor ( manifold absolute pressure ) the sensor monitors the engine vacuum, as the vacuum decreases like when you accelerate or are pulling a load like climbing a large hill. the on-board computer uses this info. and other info. from other sensors like the TPS and MASS to make adjustments to the fuel mixture and ignition timing to give you the most power and fuel economy. the computer will use other info. if it thinks the MAP is not giving correct readings but with out this sensor the fuel mileage and power will be reduced, you need to have it repaired soon, it most likely will not cause the car to stop running but it will not run properly with out the sensor. also the car will not pass a state emission test with the light on and the sensor not working.

Mar 15, 2011 | 2004 GMC Envoy

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Hi its Bill here again, about the Ford '99 Longreach ute 4.0 ltr Where exactly is the cold start temp sensor? is it the two pronged plug in thing about 2" under the thermostat?..and how would that...

The cold start temp sensor is same as ambient air sensor, tells the computer to give the engine a certain amount of fuel to start since there isn't a choke per se. There are two temp sensors, the air temp sensor and the water temperature sending unit usually near the thermostat. The cold start doesn't affect fuel economy unless it's telling the computer the engine is cold. The computer reads several sensors to meter the fuel, map sensor which works off intake manifold pressure (check rubber hose for cracks that connects it), throttle position sensor which is the main fuel control (test it with an ohm meter) and oxygen sensors. The main culprits for bad fuel mileage are usually a partially stopped up catalytic convertor and bad oxygen sensor(s). You can sometimes remove a O2 sensor and spray it with carb cleaner , lightly brush the carbon off with a wire brush to get it working again. This fuel with alcohol is rough on all vehicles. Hope some of this helps.

May 16, 2017 | 1999 Ford Super Duty F 550

2 Answers

Need to know how to test MAP sensor

the computer will give a code if its bad
the codes related to the map sensor is PC0106,0107,0108

Feb 28, 2010 | 1990 Ford Bronco II

2 Answers

I have a 1994 chevy work truck with a 305. I have trouble codes # 15, 22, 33, 34, 44, and 53. The egr valve had been removed but apeared good. Someone had put a plate over the port. Additionaly someone...

DTC - 15 Engine coolant temp sensor error (low temp indicated)
DTC - 22 Throttle position sensor error (signal low)
DTC - 33 MAP sensor circuit error (signal high indicating low vacuum)
DTC - 34 MAP sensor circuit error (signal low indicating high vacuum)
DTC - 44 Oxygen sensor error (lean condition indicated)
DTC - 53 Digital EGR Valve solenoid 1 error

MAP is short for manifold absolute pressure sensor,,it senses the manifold pressure and applies the right amount of gas with the right amount of ignition timing so the car runs and performs well if this does not work properly,it throws off the whole loop cycle for the computer,,which in turn makes it run badly,,and get poor fuel economy,,it causes one to have a lack of power,,combined with a loss of fuel economy,,and also poor take offs,,and sometimes an occasional stalling,,i hope this helps.

EGR system was really developed for was emissions control. the purpose of the EGR valve is to regulate the amount of exhaust gas recirculated back into your combustion chamber to send the gasses through another cycle in order to eliminate any excess pollutants like NOX (nitrogen oxides), N2 (nitrogen), O2 (oxygen), CO2(carbon dioxide) and HC (Hydrocarbons). the EGR was also developed to lower combustion temps that's another reason why the exhaust is recirculated the exhaust gasses will not burn therefor lowering combustion temps, because there is less "usable" air going into the cylinders.

Nov 17, 2009 | 1994 Chevrolet C/K 2500

1 Answer

I'm getting check engine light on my dash, and it tells me that its code P0106. how do i fix this and what is it?

This info coutesy of OBD-II

Potential Symptoms The following could be symptomatic of a P0106:
  • Engine runs rough
  • Black smoke at tailpipe
  • Engine will not idle
  • Poor fuel economy
  • Engine misses at speed
Causes A P0106 could be caused by:
  • Bad MAP sensor
  • Water/dirt intrusion affecting MAP sensor connector
  • Intermittent open in the reference, ground, or signal wire for the MAP sensor
  • Intermittent short in the reference, ground, or signal wire for the MAP sensor
  • Ground problem due to corrosion causing intermittent signal problem
  • Bad PCM (do not assume the PCM is bad until you've exhausted all other possibilities).
Possible Solutions Using a scan tool, watch the MAP sensor value with the key on, engine off. Compare the BARO reading with the MAP reading. They should be roughly equal. The voltage for the MAP sensor should read approx. 4.5 volts. Now start the engine and look for a significant drop in the MAP sensor voltage indicating the MAP sensor is working.
If the MAP reading doesn't change perform the following: 1. With the Key on, engine off, disconnect the vacuum hose from the MAP sensor. Using a vacuum pump, pull 20 in. of vacuum on the MAP sensor. Does the voltage drop? It should. If it doesn't inspect the MAP sensor vacuum port and vacuum hose to manifold for a restriction of some kind. Repair or replace as necessary. 2. If there are no restrictions, and the value doesn't change with vacuum, then perform the following: with the Key on and engine off and the MAP sensor unplugged, check for 5 Volts at the reference wire to the MAP sensor connector with a Digital Voltmeter. If there is none, check for reference voltage at the PCM connector. If the reference voltage is present at the PCM connector but not the MAP connector, check for open or short in the reference wire between MAP and PCM and retest. 3. If reference voltage is present, then check for existing ground at the MAP sensor connector. If it isn't present then repair open/short in the ground circuit. 4. If ground is present, then replace MAP sensor.

Jan 22, 2009 | Ford Freestyle Cars & Trucks

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