p0300 Need Help Plz!
05-03-2008, 01:08 PM
#1
TECH Apprentice
Thread Starter
iTrader: (3)
Join Date: Jun 2006
Location: Alma, Ar.
Posts: 319
Likes: 0
Received 0 Likes
on
0 Posts
p0300 Need Help Plz! I will start off saying Bank 2 LTFTs are are 25% and all the spark plugs were completely black and you can see the gas coming out of the tail pipes. I changed the plugs and wires with MSDs and NGKs TR55 about 2 months ago so I thought maybe that was the problem and have switched back to the stock plugs and wires but that didnt help. I also swapped O2s and reset the battery but that did not help either. Mods are headers intake and stall on stock tune. Thanks for any help.
05-03-2008, 02:22 PM
#3
On The Tree
iTrader: (4)
Join Date: Jan 2006
Location: middle of nowhere ca.
Posts: 150
Likes: 0
Received 0 Likes
on
0 Posts
thats a fairly common code for cammed cars but i see youre not cammed. i would say double check youre wires and make sure theyre all connected. also did you gap youre plugs? and make sure the coil connectors on on too. i wouldnt really worry about it unless it points out a perticular cylinder like po301 to po308.
05-03-2008, 02:46 PM
#4
TECH Apprentice
Thread Starter
iTrader: (3)
Join Date: Jun 2006
Location: Alma, Ar.
Posts: 319
Likes: 0
Received 0 Likes
on
0 Posts
Spark plug gap is .060 but I will double check all wires thanks. Yes i have completely stock internals.
Last edited by Black99CamaroSS; 05-03-2008 at 04:42 PM.
05-03-2008, 03:02 PM
#5
If your ltft's are that high look for a vaccum leak. on that side of the motor i.e. the air pump tubes going to the manifold. I had that happen a few months ago those vac tubes get brittle and break easy.
05-03-2008, 03:11 PM
#6
p.s. a cheap way to trouble shoot is to cut a thin piece of metal and sandwich it between the emissions fitting and the air tube(if your headers have emissions provisions that is..) if that brings you ltft's back down you found your problem and just by some block off plates so it won't happen anymore. that extra air going by the 02 sensor really messes with stuff. Oh and is the car running okay or does it jerk and sputter?
05-03-2008, 03:18 PM
#7
TECH Apprentice
Thread Starter
iTrader: (3)
Join Date: Jun 2006
Location: Alma, Ar.
Posts: 319
Likes: 0
Received 0 Likes
on
0 Posts
I have all emission stuff capped off and yes it runs terrible and wouldnt let the converter lock. I will still check for vacuum leaks thanks again.
Trending Topics
05-03-2008, 04:35 PM
#9
TECH Apprentice
Thread Starter
iTrader: (3)
Join Date: Jun 2006
Location: Alma, Ar.
Posts: 319
Likes: 0
Received 0 Likes
on
0 Posts
I check out all the hoses and they seemed fine. Doesnt it usually idle high if you have a vacuum leak? My SES light just starts flashing the second i start it up.
05-06-2008, 12:58 AM
#11
TECH Resident
iTrader: (15)
Join Date: Oct 2006
Location: Tennessee
Posts: 910
Likes: 0
Received 0 Likes
on
0 Posts
it is most likely and exhaust leak on the passenger side where the tube goes to the top of the header. Its most likely loose.
When I had the problem that's what caused it.
I had to tighten the leak first.
swap plugs because they were fouled(all 8)I like'em all fresh
optional(wires)
I swapped 4 coils and it made it better then I ended up doing the other 4 and it fixed my problem.
btw I had the same po300 code.
When I had the problem that's what caused it.
I had to tighten the leak first.
swap plugs because they were fouled(all 8)I like'em all fresh
optional(wires)
I swapped 4 coils and it made it better then I ended up doing the other 4 and it fixed my problem.
btw I had the same po300 code.
