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2005 Mazda MPV LTFT Too Negative and Misfire/Stumble

Has a slight miss in park or in gear...worsens with just a touch of throttle applied while power braking. With even more throttle applied it can become quite steady and a hard misfire around 1800 RPM. LTFT on both banks hovering around -15 to -20 at idle in park. Fuel system in closed loop. O2's seem to be switching fine. They are not staying high or low...switch speed seems normal. Any ideas? Bad MAF? Bad Coil? No MIL present. All monitors all reset and in pass status.

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6ya6ya
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Posted on Jan 02, 2017

redbeard00
  • 957 Answers

SOURCE: what do i need/how to fix a 1996 saturn 1.8 dual with code p0420

O2 sensors are good for 80 to 100k miles. a simple test for an O2 sensor is to remove it and shake it. If it makes any type of rattle noise then replace it. Also while the )2 sensor is out you can run a back pressure test.

Posted on Apr 24, 2009

  • 194 Answers

SOURCE: 98 mazda 626 dx 2.0

Try changing the ignition Moduel.Good Luck.

Posted on Dec 09, 2010

c_dyer01905
  • 24 Answers

SOURCE: 2002 mazda mpv idle rough codes say lean banks

It could be something as small Such as plugged fuel Injectors. Run a bottle of fuel injector cleaner (I use Lucas Fuel Treatment) Through the system and fill your tank with a higher grade gas and it should improve...

Posted on Dec 10, 2010

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1 Answer

Mazda 3 2005 won shift from park and won star either I have to put in neutral to b able to star car?


If it won't shift from park my first question would be how do you get it Into neutral? Sounds like you may have a gear selector sensor issue .

Oct 14, 2013 | 1997 Mazda MPV

2 Answers

I have a mazda mpv 2000 minivan.problem code p0301 misfire detected cylinder#1


I'd check #1 spark plug.
Usually a misfire code "fix" is a spark plug, spark plug wire, or a coil pack / distributor.
Keeping it simple...I'd go with the spark plug first and then look at the condition of the wires.

Hope this helps...

Aug 28, 2011 | 2005 Mazda MPV

1 Answer

2004 mazda mpv. suddenly unable to shift from park into any gear. what happened?


Probable culprit would be the electric solenoid that releases the gear shift linkage when you apply the brake pedal. Since it's electric, a dead battery will cause the same result. Check to see if your brake lights are working. If not try replacing your brake light switch as this also gets power to the above mentioned solenoid.

This is a safety feature to prevent children from accidentally putting a car in gear.

Good luck!

Jan 09, 2011 | 1997 Mazda MPV

1 Answer

At times or most of the time the fuel data keeps cycling through all its functions including the change engine oil lamp.


There can be a misfire too from the cylinders.

An engine that hesitates, stumbles or misfires when accelerating or when it is under load is an engine that is either sucking too much air, not getting enough fuel or misfiring. If the Check Engine Light comes on, you may find any of the following codes:

• P0171, P0174 Lean fuel condition codes
• P0120 to P0124 Throttle position sensor codes
• P0222 to P0229 Throttle position sensor codes
• P0400 to P0409 EGR related codes

If there are no misfire codes, a common cause of acceleration stumble is a bad throttle position sensor (TPS). The TPS tells the computer how far the throttle is open. The computer uses this information to determine how much fuel is needed to maintain the correct air/fuel mixture and when extra fuel is needed if the throttle suddenly opens wide.

Another common cause is dirty fuel injectors. If varnish deposits have built up in the tips of the injectors, they won’t spray as much fuel as they normally do, or will “dribble” fuel instead of spraying a fine mist. This creates a lean fuel mixture and conditions that are ripe for stumble and hesitation (also misfire). Look at short term fuel trim (STFT) and long term fuel trim (LTFT) with your scantool. If the numbers are high, it tells you the engine is running lean and the injectors need cleaning. Treat mild cases with a high quality fuel-injector cleaner additive. Severe cases require professional cleaning equipment.

Also if this sensors apply to your vehicle, camshaft sensor or crankshaft sensor if sensors bad you don't get any spark. Also run a scan on the car.

Good luck and rate this solution, please.

Apr 06, 2010 | 1992 Cadillac DeVille

1 Answer

Transmission vibrates hard during accleration, not in neutral, or when load is reduced or eliminated. ONLY during acceleration, or load, e.g. hill, trailer.


There can be a misfire too from the cylinders.

An engine that hesitates, stumbles or misfires when accelerating or when it is under load is an engine that is either sucking too much air, not getting enough fuel or misfiring. If the Check Engine Light comes on, you may find any of the following codes:

• P0171, P0174 Lean fuel condition codes
• P0120 to P0124 Throttle position sensor codes
• P0222 to P0229 Throttle position sensor codes
• P0400 to P0409 EGR related codes

If there are no misfire codes, a common cause of acceleration stumble is a bad throttle position sensor (TPS). The TPS tells the computer how far the throttle is open. The computer uses this information to determine how much fuel is needed to maintain the correct air/fuel mixture and when extra fuel is needed if the throttle suddenly opens wide.

Another common cause is dirty fuel injectors. If varnish deposits have built up in the tips of the injectors, they won’t spray as much fuel as they normally do, or will “dribble” fuel instead of spraying a fine mist. This creates a lean fuel mixture and conditions that are ripe for stumble and hesitation (also misfire). Look at short term fuel trim (STFT) and long term fuel trim (LTFT) with your scantool. If the numbers are high, it tells you the engine is running lean and the injectors need cleaning. Treat mild cases with a high quality fuel-injector cleaner additive. Severe cases require professional cleaning equipment.

Also if this sensors apply to your vehicle, camshaft sensor or crankshaft sensor if sensors bad you don't get any spark. Also run a scan on the car.

Good luck and rate this solution, please.

Apr 07, 2010 | Mitsubishi Eclipse Cars & Trucks

1 Answer

When I try to start my 08 escape xlt, the engine doesn't turn over. I tried to get a boost from 2 different sources and neither worked. The fuses and relays all look fine and the only light that lights up...


There can be a misfire too from the cylinders.

An engine that hesitates, stumbles or misfires when accelerating or when it is under load is an engine that is either sucking too much air, not getting enough fuel or misfiring. If the Check Engine Light comes on, you may find any of the following codes:

• P0171, P0174 Lean fuel condition codes
• P0120 to P0124 Throttle position sensor codes
• P0222 to P0229 Throttle position sensor codes
• P0400 to P0409 EGR related codes

If there are no misfire codes, a common cause of acceleration stumble is a bad throttle position sensor (TPS). The TPS tells the computer how far the throttle is open. The computer uses this information to determine how much fuel is needed to maintain the correct air/fuel mixture and when extra fuel is needed if the throttle suddenly opens wide.

Another common cause is dirty fuel injectors. If varnish deposits have built up in the tips of the injectors, they won’t spray as much fuel as they normally do, or will “dribble” fuel instead of spraying a fine mist. This creates a lean fuel mixture and conditions that are ripe for stumble and hesitation (also misfire). Look at short term fuel trim (STFT) and long term fuel trim (LTFT) with your scantool. If the numbers are high, it tells you the engine is running lean and the injectors need cleaning. Treat mild cases with a high quality fuel-injector cleaner additive. Severe cases require professional cleaning equipment.

Also if this sensors apply to your vehicle, camshaft sensor or crankshaft sensor if sensors bad you don't get any spark.

Good luck and rate this solution, please.

Mar 16, 2010 | 2008 Ford Escape

1 Answer

I have a 2002 2.4 lt Mazda MPV sports and when your driving the car seems to have a little miss. It seems to be the worse when your cruising around the 80kms its like a misfire or something, its hard to...


missing would show itself at low engine speeds.bad starting.or heavy load (going up steep hills)a miss at high speed would not be felt (normally)without other symptoms(lack of power etc)have you tried using higher octane fuel......mazda rec 92+ octane...

Feb 17, 2010 | 2002 Mazda MPV

3 Answers

Need to know the cylinder number locations on a 2004 Mazda MPV


Does anyone know the cylinder number locations??

Sep 22, 2009 | 2004 Mazda MPV

1 Answer

2005 MPV shuts off after I let go of the gas after


I'd pull the "idle air control valve " (located on side of throttle body near front) off, and use some throttle body spray cleaner on it & the port it came out of. Spray pintle (pointed part) good to remove any gunk etc. Re-install, it & try it. if it cures your problem for a while & starts to act up again, replace it.

Aug 06, 2009 | 2007 Mazda MPV

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