Question about Mazda Protege

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I have a 2002 madza protege with 160K miles, the check engine light is on and the code is for O2 senser and misfire. I changed both coils,plugs, and wires and still smokes with fuel smell. I havent changed the O2 senser fearing it might ruin it. any ideas

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  • Master
  • 2,101 Answers

You need to change the o2 sensor

Posted on Dec 05, 2012

  • 5 more comments 
  • Keith Dec 05, 2012

    I ill give it a try reset the code.Have you seen similar probems

  • teds repairs
    teds repairs Dec 05, 2012

    In my garage I see a lot of bad o2 sensors and misfiring now with the way cars are built

  • Keith Dec 05, 2012

    I have replaced the timing belt a month ago and ran like a top then.

  • Keith Dec 05, 2012

    but this smokes ALOT....Its raw fuel for sure.

  • teds repairs
    teds repairs Dec 05, 2012

    that meanyou have a weak ignition or a bad fuel pressure regulator

  • Keith Dec 05, 2012

    I will check both as well you have confirmed what I was thinking, Thank you

  • teds repairs
    teds repairs Dec 05, 2012

    th s the lnk to my garage am on facehttps://www.facebook.com/TedsRepairs

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  • Expert
  • 193 Answers

Need scantool to read o2 readings and injector pulse readings. Leaking injectors? Leaking fuel pressure regulator?

Posted on Dec 05, 2012

  • Jeremy Nottingham
    Jeremy Nottingham Dec 05, 2012

    Also old spark plugs would have told the tail.

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SOURCE: 2002 Ford Ranger check engine light indicating misfire

Code P0301
Ignition Coil Pack
Ignition Cable
Spark plug
Clog or dirty fuel injector
Evap canister purge valve
Engine Compression
fuel pressure

you have 3 type of engine for your truck
2.3L 4 cylinder
3.0L 6 Cylinder
4.0L 6 Cylinder

need to know that type Engine

The reason why the service light come on because it is a hard code
not a soft code.

Let me know

Posted on Sep 20, 2009

chuck943
  • 783 Answers

SOURCE: engine code p0307 cylinder #7 misfire

It could be carbon deposits on valve seats keeping valves from totally closing. You can try getting you a can of motorcraft PM3 top end engine cleaner and get engine up to operating temp then remove one of the small vacuum lines from the intake and draw the contents of the can slowly into the engine.After you have drawn in the contents shut engine off and let it soak for about 45 minutes then crank it back up and let it run until it clears. Now it will smoke like a forrest fire while you are doing this so don't be alarmed,just tell the neighbors you are spraying for mosqitos.This may cure the problem. If not you may be looking at a valve job.
This can be verified with a compression test if this is what is causing it.

Posted on Feb 05, 2009

gtaplytmpt
  • 90 Answers

SOURCE: 02 navigator misfire #7 cyl still after i changed plugs and coil

You've tried everything but getting the timing checked out. You've done all the other parts of a tune-up but that.

When you changed the spark plugs did you notice #7 was especially dirty or greasy, this could point to a seal being broken or a piston ring that needs replacing.

Posted on Jul 07, 2009

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SOURCE: 2005 Jimmy 4X4, 4.3L, P300 multiple misfire. Have

Try some injector cleaner in the fuel--there might be some water in the fuel also. Check the air cleaner.

Posted on Aug 01, 2009

ZJLimited
  • 17970 Answers

SOURCE: 2002 Saturn SL1 check engine light code P0303

For old models, Saturn/GM also used the same material fiberglass gasket in your model, you almost certainly have a leak from a crumpled, sucked-in gasket as I suffered (and many others). I would say going to Saturn dealership to make repairs is probably not good idea if they are going to put in the same GM intake gasket part. Maybe possible to specify Felpro gasket with whatever shop you go to if you don't do the repair yourself. I would not go too long with your car in that condition as there is localized leaning at your cyl-3, that could cause a burnt exhaust valve there.

The exhaust is extra hot venting out that cylinder. P0303 is misfire at cyl-3. Mine was P0301 (cyl-1). You may get P0507 once in a while when PCM fails to control the fast idle caused by the leak under certain conditions. Most of the time, it is very slow idle caused by 3 cylinders running. You run smoother in cold idle because the IAC opens up to increase idle and end up lowering the manifold vacuum, so the reduced vacuum causes less leaking at the failing intake manifold gasket.

I'd say try cleaning everything with your ignition before replacement; Idle problems could be caused by engine coolant sensor (ECTS). Are you sure it was changed? Did they put on a new wire connector along with it?

Hope helps.

Posted on Dec 29, 2009

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1 Answer

LIMP MODE HOME


The O2 Sensors need to be changed at 100,000 miles,
before they fail & you get a MIL Lamp on your dash

Just the front (2) closest to the engine, at the converter inlet

The ETC Failsafe, is most likely bad COP ignition coils
Have to check for cylinder misfire count with a professional
scan tool in Mode #06,unless you want to spend a few days
walking a new coil from one cyl to the next

Always provide V6 or V8 in your question & lots of detail

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1 Answer

My 2002 envoy has a miss that just started==was driving on the freeway for about 40 miles @70 pulled n a station to get a drink ==started it back up and it started missing like a dead plug or coil i...


2002 Envoy sle 4.2 L straight 6. Random misfire(PO300). After erasing codes for several days, I finally took my car on the highway and ran it at high speed(70+) for about 4 to 5 miles. Check engine light came on as before but this time it gave me(PO305). Random misfire cylinder 5. So I switched coil 5 with coil 2. Went back out on the highway and repeated as before. This time it gave me(PO302). This was telling me I had a bad coil. Replacing one coil pack solved the problem. The professionals told me low fuel pressure would not give me random misfire, but rather a O2 code because the engine is running lean. Thank you------------------------------------ thank you very much.

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2 Answers

Misfire in cylinder 6. chaned coils an spark plugs still come up as misfire in cylinder 6. CHANGED ignition coil still comes up. What should i do next?


Plugs get changed at 70,000 miles
I would suggest that you use the OEM
Plugs,they are made by NGK and are special
on my 2004 LS,I don't know about yours.

Clean the MAF Sensor with the CRC Product
for that

Change the 2 front O2 Sensors at 100,000 miles

Check fuel pressure at the fuel rail on engine

The coil you replaced on #6 ,even though you
have a PO306 Code,doesn't mean that was the
bad one. It is a COP Coil or Ford thing, you will
learn as you get involved with them

In some cases, you buy 1 new coil and walk it
from one cylinder to the next.

On single coil codes, you may get lucky,on multiple
codes or a really bad coil you won't

Your not using any fancy test equipment and
unfortunately a lot of repair shops have it and
don't know how to use it,including dealers

V6 or V8 ?

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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.

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1 Answer

2002 Ford Ranger check engine light indicating misfire


Code P0301
Ignition Coil Pack
Ignition Cable
Spark plug
Clog or dirty fuel injector
Evap canister purge valve
Engine Compression
fuel pressure

you have 3 type of engine for your truck
2.3L 4 cylinder
3.0L 6 Cylinder
4.0L 6 Cylinder

need to know that type Engine

The reason why the service light come on because it is a hard code
not a soft code.

Let me know

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1 Answer

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