P0300 - Mazda 6 Forums : Mazda 6 Forum / Mazda Atenza Forum

SIX_SEVEN_ONE · 10-14-2012, 06:42 PM

Hey M6ers,

Getting this code on my 03 V6 manual.
Starts up and idles fine.
When driving however it feel real sluggish and weak.

Been doing some searching around here and it seems like either coil packs or a vac leak but before I order them I wanna be sure.

When at idle I sprayed starter fluid around the manifold and vac lines but no luck.

Pulled the plugs that I just installed last week and 3 are dark/black, 2 are light brown and 1 like yellowish/white.

Any info would be sweet. Thanks in advance.

SIX_SEVEN_ONE · 10-14-2012, 11:19 PM

I went ahead and order a set of coil packs. 90 bucks per pack if I was to get em locally.

Gave that a "No Thanks" and placed an order for all 6 for 80 bux.

One thing i will check when I get home is plug gap. I just trusted the manufacturer to pregap it correctly before shipping. ???

Mr.Smoke · 10-14-2012, 11:32 PM

Always check gap before installing plugs. When i bought my ngk iridiums every plug was out of spec.

Here is something that will give insight as to sprak plug conditions.

SIX_SEVEN_ONE · 10-14-2012, 11:37 PM

^^ I always checked gap when changing plugs on my old turboed V6 tib but when doing stock vehicles I never thought about it.

One thing I will definatly keep in mind from now on though.

Thanks for that link. Very informative

Mr.Smoke · 10-14-2012, 11:43 PM

No prob glad i could help.

Plug gap is so important. For everything from a 2 stroke weedeater up to million dollar cars. Just my 2¢

SIX_SEVEN_ONE · 10-15-2012, 12:03 AM

Understood.

What are the chances of oil leaking thru the valve seals or piston rings into the chamber but no smoke coming out the back??

Thanks!!

flipper66 · 10-15-2012, 01:09 PM

very limited.

did you check the intake boot for rips/tears?

SIX_SEVEN_ONE · 10-15-2012, 06:24 PM

Not yet but I sure noticed a good/bad amount of oil in both the intake manifold and piping.
Looks like its coming from da front valve cover.

PCV still good but went ahead and ordered a new one.

SIX_SEVEN_ONE · 10-16-2012, 08:24 PM

Update: Plug gap was definatly off. Gapped them to .044, put everything back together, test drove it with same issues.

Starts up fine, idles good, lack of power down low and bogges a bit when accelerating.

It does smoke out a bit out the back. If coil packs dont fix the prob I may look into changing out valve seals.

How can I confirm if the seals are out? Besides the smoke coming out the back what else can I do to confirm it is seals and not something else?

Thanks!!!!!!

flipper66 · 10-17-2012, 11:55 AM

leak down test.

again it is very unlikely.

10-14-2012, 06:42 PM	#1 (permalink)
SIX_SEVEN_ONE Learners License Join Date: Oct 2012 Posts: 34 Thanks: 2 Thanked 0 Times in 0 Posts Groans: 0 Groaned at 0 Times in 0 Posts Mentioned: 0 Post(s) Tagged: 0 Thread(s) Quoted: 0 Post(s) iTrader: 0 reviews	P0300 Hey M6ers, Getting this code on my 03 V6 manual. Starts up and idles fine. When driving however it feel real sluggish and weak. Been doing some searching around here and it seems like either coil packs or a vac leak but before I order them I wanna be sure. When at idle I sprayed starter fluid around the manifold and vac lines but no luck. Pulled the plugs that I just installed last week and 3 are dark/black, 2 are light brown and 1 like yellowish/white. Any info would be sweet. Thanks in advance.

10-14-2012, 11:32 PM	#3 (permalink)
Mr.Smoke Smoke Screen Join Date: Dec 2011 Location: Kitchener, ON Canada Posts: 5,309 Thanks: 665 Thanked 775 Times in 661 Posts Groans: 1 Groaned at 4 Times in 4 Posts Mentioned: 134 Post(s) Tagged: 2 Thread(s) Quoted: 659 Post(s) iTrader: 0 reviews	Always check gap before installing plugs. When i bought my ngk iridiums every plug was out of spec. Here is something that will give insight as to sprak plug conditions. __________________ Smoke's Glacier Silver '07 6s Hatch CLICK HERE TO CAST YOUR VOTE FOR 6OTM!!

10-14-2012, 11:43 PM	#5 (permalink)
Mr.Smoke Smoke Screen Join Date: Dec 2011 Location: Kitchener, ON Canada Posts: 5,309 Thanks: 665 Thanked 775 Times in 661 Posts Groans: 1 Groaned at 4 Times in 4 Posts Mentioned: 134 Post(s) Tagged: 2 Thread(s) Quoted: 659 Post(s) iTrader: 0 reviews	No prob glad i could help. Plug gap is so important. For everything from a 2 stroke weedeater up to million dollar cars. Just my 2¢ __________________ Smoke's Glacier Silver '07 6s Hatch CLICK HERE TO CAST YOUR VOTE FOR 6OTM!!

10-15-2012, 01:09 PM	#7 (permalink)
flipper66 banana boat. Join Date: Aug 2004 Location: lake Mary, Florida Posts: 6,199 Thanks: 63 Thanked 776 Times in 680 Posts Groans: 2 Groaned at 44 Times in 40 Posts Mentioned: 20 Post(s) Tagged: 1 Thread(s) Quoted: 116 Post(s) iTrader: 1 reviews	very limited. did you check the intake boot for rips/tears? __________________ if you need a new V6 engine look here

10-16-2012, 08:24 PM	#9 (permalink)
SIX_SEVEN_ONE Learners License Join Date: Oct 2012 Posts: 34 Thanks: 2 Thanked 0 Times in 0 Posts Groans: 0 Groaned at 0 Times in 0 Posts Mentioned: 0 Post(s) Tagged: 0 Thread(s) Quoted: 0 Post(s) iTrader: 0 reviews	Update: Plug gap was definatly off. Gapped them to .044, put everything back together, test drove it with same issues. Starts up fine, idles good, lack of power down low and bogges a bit when accelerating. It does smoke out a bit out the back. If coil packs dont fix the prob I may look into changing out valve seals. How can I confirm if the seals are out? Besides the smoke coming out the back what else can I do to confirm it is seals and not something else? Thanks!!!!!! Last edited by SIX_SEVEN_ONE; 10-16-2012 at 08:32 PM.

10-14-2012, 11:19 PM	#2 (permalink)
SIX_SEVEN_ONE Learners License Join Date: Oct 2012 Posts: 34 Thanks: 2 Thanked 0 Times in 0 Posts Groans: 0 Groaned at 0 Times in 0 Posts Mentioned: 0 Post(s) Tagged: 0 Thread(s) Quoted: 0 Post(s) iTrader: 0 reviews	I went ahead and order a set of coil packs. 90 bucks per pack if I was to get em locally. Gave that a "No Thanks" and placed an order for all 6 for 80 bux. One thing i will check when I get home is plug gap. I just trusted the manufacturer to pregap it correctly before shipping. ???

10-14-2012, 11:37 PM	#4 (permalink)
SIX_SEVEN_ONE Learners License Join Date: Oct 2012 Posts: 34 Thanks: 2 Thanked 0 Times in 0 Posts Groans: 0 Groaned at 0 Times in 0 Posts Mentioned: 0 Post(s) Tagged: 0 Thread(s) Quoted: 0 Post(s) iTrader: 0 reviews	^^ I always checked gap when changing plugs on my old turboed V6 tib but when doing stock vehicles I never thought about it. One thing I will definatly keep in mind from now on though. Thanks for that link. Very informative

10-15-2012, 12:03 AM	#6 (permalink)
SIX_SEVEN_ONE Learners License Join Date: Oct 2012 Posts: 34 Thanks: 2 Thanked 0 Times in 0 Posts Groans: 0 Groaned at 0 Times in 0 Posts Mentioned: 0 Post(s) Tagged: 0 Thread(s) Quoted: 0 Post(s) iTrader: 0 reviews	Understood. What are the chances of oil leaking thru the valve seals or piston rings into the chamber but no smoke coming out the back?? Thanks!!

10-15-2012, 06:24 PM	#8 (permalink)
SIX_SEVEN_ONE Learners License Join Date: Oct 2012 Posts: 34 Thanks: 2 Thanked 0 Times in 0 Posts Groans: 0 Groaned at 0 Times in 0 Posts Mentioned: 0 Post(s) Tagged: 0 Thread(s) Quoted: 0 Post(s) iTrader: 0 reviews	Not yet but I sure noticed a good/bad amount of oil in both the intake manifold and piping. Looks like its coming from da front valve cover. PCV still good but went ahead and ordered a new one.

10-17-2012, 11:55 AM	#10 (permalink)
flipper66 banana boat. Join Date: Aug 2004 Location: lake Mary, Florida Posts: 6,199 Thanks: 63 Thanked 776 Times in 680 Posts Groans: 2 Groaned at 44 Times in 40 Posts Mentioned: 20 Post(s) Tagged: 1 Thread(s) Quoted: 116 Post(s) iTrader: 1 reviews	leak down test. again it is very unlikely. __________________ if you need a new V6 engine look here

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