Question about 2001 Mazda 626

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Decrease in fuel milage after repairs

I had my starter, knock sensor, fuel pump, fuel filter, two oxygen sensors and some fuel sending something all replaced and I am now getting 16mpg, when I got 20mpg before. That's even on the highway, when I got 22-24mpg.

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Is your CEL light on? Any warning lights at all?

This sounds like your computer is operating in "safe" mode.

Posted on Feb 10, 2014

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Posted on Jan 02, 2017

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SOURCE: hi I have a 94 mazda B2300 4 cylinder, Why very poor gas mileage

check the fuel filter or a possible leak in the fuel line or vacuum lines.your exhaust could be clogged causing too much back pressure

Posted on Mar 15, 2009

  • 79 Answers

SOURCE: 93 mazda mx6 wont run. will start but runs very

If yours is the v6 2.5 the tps is adjustable and you can turn it up and down. On my mazda it acted like it was in the fuel system and i ended up replacing the distributor.

Posted on Feb 06, 2010

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SOURCE: i am trying to get a 1990 mazda b2600i running but

wrong vacuum line hooked to fuel regulator

Posted on Oct 30, 2010

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SOURCE: I have a 2002 mazda

Can't solve, but, had the same problem. Replaced everything the codes indicated. Drove a couple of weeks and the transmission went. Third gear is gone.

Almost $ 2000.00 to chase the codes, now the transmission is going to cost $ 2,700.00 to rebuild.

Take car to a trans. shop before the transmission burns up and the rebuild will be less!!!!

Posted on Nov 10, 2010

  • 1 Answer

SOURCE: mazda 2000 astina flat spot

I have seen the rotor button cause hesitation on take off, on several different Mazda Astina's.
Not a certainty, but a probable cause regardless.

John Donohue

Posted on Nov 09, 2011

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2 Answers

Will a bad oxygen sensor give me bad gas mileage in my 07 pacifica with the 4.0L engine. Will hhoking it up to a computer give me any indication that it is bad.


Bad 02 sensor will give bad mileage, as car is starving for air, sometimes computers will not detect if it is bad, slot of simple performance problems results from 02 sensors, fuel filters, dirty injectors, poor fuel, dirty air filters. Those are some the main things to look at for best fuel mileage and performance. Hope this helped, please let me know. Thanks, mike from fixya

Jun 12, 2011 | Chrysler Pacifica Cars & Trucks

1 Answer

2005 Dodge Dakota V8 4.7L, 4X4, engine light on, code P0452 . Where is the fuel pressure sensor located?


  1. The Fuel Level Sending Unit, or Fuel Level Sensor, is located in your gas tank with the Fuel Pump Module. The fuel gauge sending unit (fuel level sensor) is attached to the side of the fuel pump module. The sending unit consists of a float, an arm, and a variable resistor track (card).
  2. The Fuel Pressure Regulator is located within fuel pump module. The fuel pressure regulator controls fuel system pressure. The PCM cannot detect a clogged fuel pump inlet filter, clogged in-line fuel filter, or a pinched fuel supply or return line. However, these could result in a rich or lean condition causing the PCM to store an oxygen sensor or fuel system diagnostic trouble code.
Both of these sensors are connected with the Fuel Pump Module. Here is a diagram:
pctech1_33.jpg

Mar 10, 2011 | Dodge Dakota Cars & Trucks

1 Answer

I need a honda car code , i can't turn on my radio


service manual.
Code Description Possible Cause
0 ECU / ECU signal No signal to ECU
1 Oxygen sensor circuit Oxygen sensor or circuit, ECU
2 Oxygen sensor circuit Oxygen sensor or circuit, ECU
3 MAP sensor circuit Map sensor circuit
4 CKP sensor / engine speed (RPM) Crank angle sensor or circuit, ECU
sensor
5 MAP sensor circuit MAP sensor or circuit, mechanical
problem
6 ECT sensor circuit ECT sensor or circuit, automatic
transaxle control unit
7 TPS / Angle Sensor TPS sensor or circuit, automatic
transaxle control unit
8 CKP sensor / engine speed (RPM) Crank angle sensor or circuit, ECU
sensor
9 CMP sensor CMP sensor or circuit
10 IAT sensor IAT sensor or circuit
11 Idle Mixture Adjuster Sensor Idle mixture adjuster sensor or
circuit
12 EGR system fault No EGR action, faulty EGR valve
13 BARO sensor circuit BARO sensor or circuit
14 Idle Air Control valve circuit / ECU Open or shorted out ignition signal
circuit / No signal to ECU
15 Ignition Output signal Open or shorted ignition output
signal circuit
16 Fuel Injector Circuit Open or shorted fuel injector
circuit
17 VSS circuit VSS sensor or circuit
18 Ignition Timing Adjuster Open or shorted signal circuit
19 A/T Lock-up control solenoid Open or shorted signal circuit,
Lock-up control solenoid lock-up solenoid
20 Electrical Load Detector / Sensor Electrical load detector or circuit
Honda/Acura
Fault Code Definitions (21 - 59)
Chapter 3 22
Code Description Possible Cause
21 Spool Solenoid Valve Open or shorted signal circuit,
spool solenoid valve
22 Valve Timing Electronic Oil Open or shorted signal circuit,
pressure switch valve timing oil pressure switch
23 Knock sensor circuit Knock sensor or circuit
30 AT / ECU communication signal A AT control unit, ECU
31 AT / ECU communication signal B AT control unit, ECU
35 Traction control / ECU / signal Traction control module, ECU
36 Traction control / ECU / signal Traction control module, ECU
41 Oxygen sensor heater - left side Oxygen sensor / heater or circuit
42 Oxygen sensor heater - right side Oxygen sensor / heater or circuit
43 Fuel Supply system - left side Oxygen sensor or circuit, fuel
system
44 Fuel Supply system - right side Oxygen sensor or circuit, fuel
system
45 Fuel metering - left side Injector control circuit, incorrect
fuel metering
46 Fuel metering - right side Injector control circuit, incorrect
fuel metering
48 Heated oxygen sensor Oxygen sensor or circuit
53 Right Knock Sensor Right knock sensor or circuit
54 CKP sensor 2 CKP sensor 2 or circuit
59 CMP sensor 2 CMP sensor 2 or circuit

Dec 28, 2010 | 1994 Honda Accord

1 Answer

Color of wires on iat sensor on a 2004 ford exploer 4.0 v6


I don't believe it has an IAT, (Intake Temperature Sensor). Heres what it has. Hope this helps. Cobra..
Electronic Engine Controls adobe.gif Printable View (63 KB) The electronic engine controls consist of the following:
  • powertrain control module (PCM)
  • throttle position (TP) sensor
  • engine coolant temperature (ECT) sensor
  • camshaft position (CMP) sensor
  • crankshaft position (CKP) sensor
  • mass air flow (MAF) sensor
  • heated oxygen sensor (HO2S)
  • knock sensor (KS)
The PCM carries out the following functions:
  • accepts input from various engine sensors to compute the fuel flow rate necessary to maintain a prescribed air/fuel ratio throughout the entire engine operational range.
  • outputs a command to the fuel injectors to meter the appropriate quantity of fuel.
The TP sensor:
  • sends the PCM a signal indicating the throttle plate angle.
  • is the main input to the PCM from the driver.
The ECT sensor:
  • sends the PCM a signal indicating engine temperature.
  • voltage decreases as coolant temperature increases.
The CMP sensor:
  • sends the PCM a signal indicating camshaft position used for fuel synchronization.
The CKP sensor:
  • sends the PCM a signal indicating crankshaft position.
  • is essential for calculating spark timing.
The MAF sensor:
  • uses a hot wire sensing element to measure the amount of air entering the engine. Air passing over the hot wire causes it to cool.
The front HO2S:
  • creates a voltage signal dependent on exhaust oxygen content.
  • provides feedback information to the PCM used to calculate fuel delivery.
The rear HO2S:
  • monitors oxygen content after it flows through the catalytic converter.
  • provides a voltage to the PCM used to calculate catalytic converter integrity.
The KS:
  • is used to detect engine detonation.
  • sends a voltage signal to the PCM.
  • is able to provide a signal which retards the ignition timing, as necessary.

Jun 12, 2010 | 2004 Ford Explorer

1 Answer

Poor gas milage


Gas milage will vary, depending on the manner in which you drive, also poor gas milage could be due to poor maintenance. Replace the PCV valve, the oxygen sensors, the fuel filter, plugs and wires, and have the injectors cleaned, switch to synthetic oil should improve the milage. .

Jun 29, 2009 | 1991 Toyota Pickup

1 Answer

SERVICE ENGINE SOON LIGHT/ POOR GAS MILAGE


knock sensor is located on the block usually under the intake. nissan has problems with these sensors. i have chaunged plenty of these on nissans in the past year. this has no affect on your gas mileage. this sensor picks up misfires on the engine. sometimes you might have rough idle and can't feel it in the drivers seat but the knock sensor can. i would suggest maybe a tune up spark plugs, air filter, fuel filter first before going to take apart a bunch of things to change a sensor. the sensor is designed to pick up any differences in motor quality and will throw the engine light on. sometimes the problem is the knock sensor, or there is an underlying cause that the knock sensor is reading.

Feb 17, 2009 | 2000 Nissan Frontier

2 Answers

Air Fuel Sensor on a 2001 Toyota tacoma


4 cylinder: one air-fuel sensor (on the pipe after the manifold) and one oxygen sensor after the catalytic converter

6 Cylinder: two air-fuel sensors (one for each manifold) and one oxygen sensor after the catalytic converter.

Dec 29, 2008 | 2001 Toyota Tacoma

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