Cylinder 1 Missfire

S

special--k

Member

:

Mazdaspeed Protege

• Oct 5, 2009

• #1

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Symptoms may include:
the engine may be harder to start
the engine may stumble / stumble, and/or hesitate
other symptoms may also be present
CausesA code P0301 may mean that one or more of the following has happened:

Faulty spark plug or wire
Faulty coil (pack)
Faulty oxygen sensor(s)
Faulty fuel injector
Burned exhaust valve
Faulty catalytic converter(s)
Running out of fuel
Poor compression
Defective computer

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I didnt notice any change in driveability, car was not harder to start or anything like that. Tank was full to the top of gas. Im leaning towards a dirty EGR, or Cat. Plugs are about 5000Miles old, and are NGK Iridium step colder.

Any other ideas?

 

J

jamesk

Member

:

mazda protege 2002

• Oct 5, 2009

• #2

Did it just happen one time or is this continuous?

 

G

GiJoe

Member

Contributor

:

03 Mazdaspeed protege

• Oct 5, 2009

• #3

did you even figure out that massive knock issue? or is this part of it?

 

S

special--k

Member

:

Mazdaspeed Protege

• Oct 5, 2009

• #4

I didnt have a massive knock... it happened one time so far. I cleared the CEL and will check what happens on the way home tonight.

 

G

GiJoe

Member

Contributor

:

03 Mazdaspeed protege

• Oct 5, 2009

• #5

oh my bad. Must have been thinking of someone else.

 

S

special--k

Member

:

Mazdaspeed Protege

• Oct 5, 2009

• #6

Ok, well there are no symptoms on the car other then the CEL. I didnt push it tho. Maybe i will boost a little on the way home. see what happens.

P.S
AFRs are all normal. 14s at cruse... there was nothing else i noticed.

 

S

speedin

#1297

:

MSP 03.5

• Oct 5, 2009

• #7

i had the same issue before , replaced a bunch of parts and ended up that cleaning the egr fixed it.

 

H

harrisonchang

Member

• Oct 5, 2009

• #8

coil pack.

 

S

SleepyMSP

Member

:

2003.5 MSP

• Oct 5, 2009

• #9

I would think the coilpacks too, I've seen the car and its not in bad shape aside from the cracked ex mani. A dirty EGR will cause bogging and a noticeable difference in drivability

 

S

special--k

Member

:

Mazdaspeed Protege

• Oct 5, 2009

• #10

cleared the CEL and it came back right when i started the car again. Where can i get a coil pack?

 

S

SleepyMSP

Member

:

2003.5 MSP

• Oct 6, 2009

• #11

fastest place would be napa or the like. Canuck tire might have them too

 

S

speedin

#1297

:

MSP 03.5

• Oct 6, 2009

• #12

i did the coil packs, plugs, plug wires, o2, maf and it ended up being a dirty egr. how is the vacuum?

 

S

special--k

Member

:

Mazdaspeed Protege

• Oct 6, 2009

• #13

Unfortunatly my boost gauge is out of the car. and wont get back in for a few weeks. It was defective, and had to be sent back to get replaced. Ill start with EGR, and see what happens. I cleared the CEL last night, and it didnt come back on today... if that tells you anything.

 

S

SleepyMSP

Member

:

2003.5 MSP

• Oct 6, 2009

• #14

it has been raining here a lot in the last few days, and I know my G/F's car had a problem that whenever it rained it would bog like mad and throw CELs left and right which was caused by a bad ignition system. But I think it was the wires not the coil packs in her case

 

H

harrisonchang

Member

• Oct 6, 2009

• #15

misfires are always the coilpacks. It was like that on all my cars.

 

K

KrayzieFox

Member

:

01 MP3 Turbo

• Oct 6, 2009

• #16

You can't say always, cuz that's certainly not true.. but they are a very common source of the problem.

 

S

special--k

Member

:

Mazdaspeed Protege

• Oct 6, 2009

• #17

SleepyMSP said:

it has been raining here a lot in the last few days, and I know my G/F's car had a problem that whenever it rained it would bog like mad and throw CELs left and right which was caused by a bad ignition system. But I think it was the wires not the coil packs in her case

Click to expand...

I guess i will look into a Coil pack.

 

S

speedin

#1297

:

MSP 03.5

• Oct 6, 2009

• #18

you can pull the wire off the plug while running (be careful not to get zapped) and see if the are firing. i am just saying i had the same issues and everyone kept telling me coil packs and wires. they are definitly easier to try and start with though.

 

S

ScratchNSniff

Undisputed Parts God

:

Way to Many

• Oct 6, 2009

• #19

I know on mine, my CEL was due to me not plugging the hole next to where I took out the butterflies on the IM...it threw a cylinder one misfire due to the air getting sucked in there...was rough idle...just took it off and resealed it...

 

S

special--k

Member

:

Mazdaspeed Protege

• Oct 6, 2009

• #20

Is there anything i can do to narrow this down? The driving is getting a little worse every time. Seems like more vibrations then normal. The CEL didnt come back on yet tho. My AFR are still the same, and i dont notice any loss in performance.