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#4544467 - 10/15/17 09:43 PM The story of multiple codes on my Mazda today
miden851 Offline


Registered: 02/15/16
Posts: 433
Loc: GA
The good thing is I fixed it as of right now; Iíll check on it again tomorrow...

So out of nowhere today, while I went to a shopping center about 20 miles away of my place of living, the car started to act strangely; sudden vibration of engine; at first I thought about someone messed my car while I was away but nothing unusual I noticed; meanwhile the sky opened, rain; I moved inside the car and Iíve noticed the engine light was on; I have the OBD scanner but it was at my home 20 miles away; the car was experiencing vibration and was shaking significantly and while it runs right at low speeds, once you reach up to speed it sounds much better; on my way home via interstate I've noticed inconsistency of the check light, while flashing one time, others time is solid; on my way back I stopped to the Advance and they scanned it for the codes; there were three codes P0304, P0171, P2274 so that 4th cylinder was misfiring; from that point I was suggested to step by step elimination process; and thatís what I did;

I swap the coils between the spark plug and no improvement; I want back to the Advance while they were still open, this was at 7:30pm and I got me Denso spark plugs; I replaced them; then there was a change, the car went back to normal; however I found of traces

So tomorrow Iíll watch for the check engine light, and I hope Iíll go back to work in my Mazda; I need my Mazda not gave up on me also if anyone knows more about spark plugs I wanted to see your opinion and what do you say the condition my engine in Mazda
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#4544469 - 10/15/17 09:45 PM Re: The story of multiple codes on my Mazda today [Re: miden851]
miden851 Offline


Registered: 02/15/16
Posts: 433
Loc: GA



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2008 Mazda6i GT; @195K miles
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#4544472 - 10/15/17 09:47 PM Re: The story of multiple codes on my Mazda today [Re: miden851]
miden851 Offline


Registered: 02/15/16
Posts: 433
Loc: GA











Edited by miden851 (10/15/17 09:52 PM)
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2008 Mazda6i GT; @195K miles
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#4544476 - 10/15/17 09:54 PM Re: The story of multiple codes on my Mazda today [Re: miden851]
miden851 Offline


Registered: 02/15/16
Posts: 433
Loc: GA
I hope you can see it, this was a last minute change on Sunday!
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#4544479 - 10/15/17 09:55 PM Re: The story of multiple codes on my Mazda today [Re: miden851]
spasm3 Offline


Registered: 05/30/10
Posts: 8646
Loc: North Carolina
How many miles on the plugs?
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#4544480 - 10/15/17 09:56 PM Re: The story of multiple codes on my Mazda today [Re: miden851]
Chris142 Online   content


Registered: 06/05/03
Posts: 16819
Loc: Deplorable in apple valley, ca
Look for a vacuum leak
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#4544482 - 10/15/17 10:02 PM Re: The story of multiple codes on my Mazda today [Re: miden851]
miden851 Offline


Registered: 02/15/16
Posts: 433
Loc: GA
I think i noticed an oil spot or two, like spread at the the cylinder head only on 4th while others were clean; Iíve noticed also there was oil on 2nd and 4th spark plug on the outside indicating leak of the valve cover ring

And yes spark plugs have about 60k miles if not more


Edited by miden851 (10/15/17 10:03 PM)
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2016 Honda CR-V EX-L; @29K miles

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#4544496 - 10/15/17 10:26 PM Re: The story of multiple codes on my Mazda today [Re: Chris142]
Seventh Offline


Registered: 11/11/12
Posts: 234
Loc: NorCal
Originally Posted By: Chris142
Look for a vacuum leak


This... and then check fuel pressure if you know for certain there is no vacuum or crankcase/pcv leak.

Lean mixture code diagnosis will lead to the cause of the problem. The misfire is the effect.

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#4544502 - 10/15/17 10:30 PM Re: The story of multiple codes on my Mazda today [Re: Seventh]
miden851 Offline


Registered: 02/15/16
Posts: 433
Loc: GA
Originally Posted By: Seventh
Originally Posted By: Chris142
Look for a vacuum leak


This... and then check fuel pressure if you know for certain there is no vacuum or crankcase/pcv leak.

Lean mixture code diagnosis will lead to the cause of the problem. The misfire is the effect.


So how do I check for vacuum and what would be symptoms of a leak in general please
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2008 Mazda6i GT; @195K miles
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#4544517 - 10/15/17 10:46 PM Re: The story of multiple codes on my Mazda today [Re: miden851]
The Critic Online   crying


Registered: 08/30/04
Posts: 19802
Loc: CA
What are your short and long term fuel trims at idle and at 2500rpm?

Generally speaking, lean conditions that are worst at idle but get better at 2500 rpm are vacuum leaks. If the lean condition is ok at idle but worsens at high rpm, most likely have a fuel issue.

Inadequate fueling can cause misfires. If you are not able to perform an injector balance test try swapping injectors with cyl 4.
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#4544518 - 10/15/17 10:46 PM Re: The story of multiple codes on my Mazda today [Re: miden851]
Seventh Offline


Registered: 11/11/12
Posts: 234
Loc: NorCal
Originally Posted By: miden851
Originally Posted By: Seventh
Originally Posted By: Chris142
Look for a vacuum leak


This... and then check fuel pressure if you know for certain there is no vacuum or crankcase/pcv leak.

Lean mixture code diagnosis will lead to the cause of the problem. The misfire is the effect.


So how do I check for vacuum and what would be symptoms of a leak in general please


The symptoms are your lean codes, misfires, and your engine runs poorly. You already know that.

Your air fuel mixture is wonky. Too much air and/or not enough fuel. Your air mass meter calculates the amount of air being sucked into the engine so the computer knows how much fuel to inject in order to keep the air fuel ratio stoich.

If your engine is sucking in air (vacuum leak) that is not being accounted for by the air mass meter, the computer doesn't know how to keep the air fuel ratio stoich, the 02 sensor complains, computer adds fuel, once it adds a certain amount it sets codes and or starts misfiring if it can't add enough.

So you're looking for intake hoses/boots that are torn, clamps loose, vacuum lines loose, crank case hoses/connectors leaking or torn, etc. This is best accomplished with a smoke machine. Pump smoke into the intake and it will leak out at your problem areas.

Basically check all the rubber things and their associated clamps first.

Could also be a bad air mass meter or fuel delivery problem but check the basics first.

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#4544583 - 10/16/17 01:50 AM Re: The story of multiple codes on my Mazda today [Re: miden851]
Merkava_4 Offline


Registered: 01/30/07
Posts: 17501
Loc: Clovis, CA
What's up with the spark plug gaps ? Looks like almost a 1/4 inch gap on all four plugs.

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#4544603 - 10/16/17 03:54 AM Re: The story of multiple codes on my Mazda today [Re: miden851]
PimTac Online   content


Registered: 03/04/17
Posts: 4278
Loc: Soviet State of Washington
I noticed that as well. Some of plugs looked chewed up around the threads too.
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#4544690 - 10/16/17 06:42 AM Re: The story of multiple codes on my Mazda today [Re: miden851]
miden851 Offline


Registered: 02/15/16
Posts: 433
Loc: GA
I ran that car this morning for about 15min, no check engine light it works just fine; should I still be concerned, or maybe not, I donít know; the car is 10 years and but still just fine car when cranked up or driven.

The spark plugs have antisizure lubricant last time I had replaced them; they look pretty worn out with carbon build up on them; no oil on them specifically.

My scan tool is 10 year old and it doesnít have live update nor live scanning for a possible problems so I cannot confirm fuel trims up or down; prior to my problem, I drove car hard on interstate yesterday, 4-5000 rpms frequently, also used cheap gas on QT in our area in latest weeks; in addition I changed the fuel pump like a month ago and I put 2000 miles on it; my fuel efficiency is good 22-24 everyday; now that Iím changed the pump and spark plugs car feels livelier than before.

Also no hissing sound in engine bay
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2008 Mazda6i GT; @195K miles
2016 Honda CR-V EX-L; @29K miles

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#4545113 - 10/16/17 12:20 PM Re: The story of multiple codes on my Mazda today [Re: miden851]
HangFire Offline


Registered: 08/21/13
Posts: 2506
Loc: Central Maryland
With engine warmed up and running, try spraying carb cleaner around different parts of the engine. In a really bad case you might see it being sucked in, but probably not. What you are really looking for is a change in engine idle. If that happens when you spray a certain spot, you have a vacuum leak there.
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