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I have a 2002 mazda protege sending a po301 code hooked up obd2 to it and the fuel trim is lean and its misfiring real bad swapped injectors around spark plugs around and still sending the same code

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  • Cars & Trucks Master
  • 5,628 Answers

Problem with #1 bad plug,bad wire,bad coil.

Posted on May 08, 2013

  • 1 more comment 
  • Andrew Erickson May 09, 2013

    I tested the spark and everything checked out the spark plug is working I even swapped the number one spark plug out with number four spark plug same thing happened and I swapped the coil packs around too

  • Bogdan Odwazny
    Bogdan Odwazny May 09, 2013

    When you swapped and what happen.

  • Andrew Erickson May 11, 2013

    The car was still running like **** and sending the same engine code

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6 Suggested Answers

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SOURCE: 1998 silverado misfire

Check for a vaccum leak at the intake. Frankster016

Posted on Oct 25, 2008

emissionwiz
  • 75108 Answers

SOURCE: troubleshooting code po301

The MAF will not cause a miss on just one cylinder, here are the things that will, low cylinder compression, defective fuel injector, intake manifold vacuum leak at the gasket, and of course ignition system problems.

Posted on Dec 18, 2008

  • 548 Answers

SOURCE: 95 volvo 940 DL hesitates injector error codes 113, 212, 232

Check the fuse to the injector. If it is out or got wet, it could mimic these conditions. let me know what happens. I have an 85 model.

Posted on Jan 15, 2009

  • 32 Answers

SOURCE: obd2 code p0300 on mazda protege 2002

Just had one of these with a maxima, the code is multiple random misfire, when a misfire occurs, to start is do the basics, replace the plugs, check fuel pressure, clean throttle body, and coolant is topped up. also I have seen if the O2 sensor is not working correctly is can cause a misfire, you will need a scan tool to look at what the O2 sensor is doing, o rby back probing the sensor (don't damage the O2 sensor wires). If it wires replace them as well, if it has coils they usually dont give that code if one fails, it will pinpoint that a certain coil if one fals.

Posted on Oct 02, 2009

dttech
  • 4803 Answers

SOURCE: misfire code, rough idle, full tune up complete,

The black soot on the plugs means that you are running extremely rich. The fuel injectors ma test good electricly, but they are notorious for leaks. The spider-looking thing sandwiched between the plastic intake plenum and the intake manifold gets cracks in it's "legs" and leaks fuel ito the plenum area. The fuel pressure regulator is also housed in this same assembly. if the diaphram in the regulator gets a pinhole in it, it also leaks fuel into the plenum area, causing all kinds of erratic idleing, black smoke from the exhaust, and will cause your fuel trims to drop into the negative 20s.

There is a technical service bulletin covering this subject. This procedure outlines the steps required to replace the existing Central SFI Fuel System with a new MFI (Multiport Flexible Injection) Fuel System.

It is removing the injectors which are all housed in the center body of the injector assembly and replacing them with a new version where the injectors are located where the ols "poppets" used to be in the intake manifold ports. The picture below is for a V-8 engine that is covered by the same TSB.052d4ba.gif
The poppets and the pressure regulator are available individually to fix your existing fuel injection system, but I gave up on that after replacing several poppets only to have them come back in a few months with another popet line broken. I recommend replacing the whole assembly with the new and improved version. My customers have told me after doing this that the engine never ran that smooth when it was new.

The GM part number for the new injector assembly for your V-6 engine is 12568332 it is also now available at several aftermarket parts outlets.

As for the timing chain solution posted by doodieman200, all I have to say is that I have enough fingers on one hand to count all of the failed timing chains I have replaced on these engines. If you don't have a cam/crank sync code, the timing chain has definitely not slipped a tooth.

Posted on Oct 18, 2009

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1 Answer

2002 ranger 2.3 codes po171 and po301 changed upstream o2 sensor still get codes any ideas?


P0301 is a engine misfire code for #1 cylinder , spark plug or plug wire problem or a bad fuel injector . Po171 system lean code . Lack of fuel , clogged fuel filter , vacuum leak . https://www.obd-codes.com/p0171 There are ways to test O2sensors before replacing . Your best bet take your vehicle to a qualified repair shop .

Feb 10, 2017 | 2002 Ford Ranger

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What does codes po301 and po173? i have a 95 maxima 130000 miles


Code PO301 is number one cylinder; misfire detected.

Code PO173 is fuel trim malfunction bank 2, possible cause intake air leak, fuel pressure or injector.

Feb 25, 2015 | Cars & Trucks

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I ran fault coded on my 2002 Mazda protege. It comes back fuel too lean bank 1. Already had fuel pump checked, and that was not the problem. Any ideas?


YOU COULD HAVE AIR LEAKS IN THE INTAKE MANIFOLD OR EXHAUST MANIFOLD.RESTRICTED FUEL FILTER AND FUEL INJECTORS.CHECK FOR BROKEN OR LOOSE VACUUM HOSES.FUEL PRESSURE REGULATOR FAILED.

Jan 24, 2011 | 2002 Mazda Protege

3 Answers

CODES-PO301-PO303-PO316- CHANGED PLUGS & WIRES. STILL MISS ON START UP, GOES AWAY MOST OF THE TIME ABOVE 1000 R.P.M


P0301 - Cylinder 1 Misfire Detected.

Causes:
- Improper spark plug at cylinder #1
- Insufficient compression at cylinder #1
- Incorrect fuel pressure
- The injector circuit is open or shorted at cylinder #1
- Fuel injector #1 may be faulty
- Intake air leak

Solutions:
- Perform Injector Service
- Replaced Spark Plug #1
- Replaced Injector #1
- Replaced Ignition Coil #1

P0303 - Cylinder 3 Misfire Detected.
Follow info from P0301.

P0316 - Misfire Occurred In The First 1,000 Engine Revolutions.

Causes:
- Damaged CKP sensor.
- Ignition System.
- Fuel Injectors
- Running out of fuel
- Fuel Quality
- Base engine
- Damaged Powertrain Control Module

Solutions:
Usually the P0316 is combine with a P03XX codes. The P03XX code indicates in which cylinder the misfire occurred.

Jan 17, 2011 | 2002 Mercury Sable

1 Answer

2002 mazda mpv idle rough codes say lean banks 1&2 plus random multiple misfire


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...

Dec 10, 2010 | 2002 Mazda MPV

8 Answers

Mazda protege no start


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.

Mar 22, 2010 | 2001 Mazda Protege

1 Answer

My check engine light is flashing i have a 2000 mazda protege lx I checked the obd and three codes popped up it said the engine is too lean so I put in premium gas and that helped the shaking and i put in...


Lean condition in fuel injected engine's are caused but a faulty MAF sensor, or it's dirty. Try cleaning the MAF sensor with MAF sensor cleaner which you can buy at most auto part stores. Just follow the instructions on the spray can and also add a bottle of fuel injector cleaner to your gas. This should help and the misfiring could be cause by the lean condition of your engine which should stop as soon as the lean condition is addressed.
Thank you for using Fixya and good luck

Mar 18, 2010 | 2000 Mazda Protege

1 Answer

Obd2 code p0300 on mazda protege 2002


Just had one of these with a maxima, the code is multiple random misfire, when a misfire occurs, to start is do the basics, replace the plugs, check fuel pressure, clean throttle body, and coolant is topped up. also I have seen if the O2 sensor is not working correctly is can cause a misfire, you will need a scan tool to look at what the O2 sensor is doing, o rby back probing the sensor (don't damage the O2 sensor wires). If it wires replace them as well, if it has coils they usually dont give that code if one fails, it will pinpoint that a certain coil if one fals.

Oct 02, 2009 | 2002 Mazda Protege

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