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Updates…. Today, I took a spare coil pack.(GOOD OEM coil pack) and swap out each cylinder at a time. I have to say, by doing unplug the coil pack at a time. Sometimes hard to tell the different under power balance test. it perhaps took longer by swap out each cylinder at a time, but I can tell the different.
Report back… Coil pack # 2 and #3 cylinder are bad. replaced with a spare (Qty. 2 OEM coil packs) that I bought while back. took a drive test 20 miles in highway, the engine came back but this time the code is still pending P0172 (Fuel system too rich bank 1).
Have a question? Can someone tell me where is bank 1 spark plug if I stand in front of the engine?
Oh, I kept all old spark plugs while swap each coil pack out. the old spark plugs are still on the engine.
Now, what can be wrong with P0172 code? Can the spark plug went bad not burn gas?
the previous code P0300, P0301, P0302, P0303, P0304, P0305, P0306 and P0172. I have to report, all cylinder misfire went away but still has check engine light with P0172.
Look back my old file, I found old box spark plugs that I bought from Napa. It says outside the box is NGK spark plugs and LASER IRIDIUM PREMIUM.
Is OK to use that spark plugs? Right now, those old spark plugs are still on my Acura 2004 TL.
Eric or someone can give me suggestion to check next. I am thinking the spark plug on Bank 1 might be bad? Need suggestions what to do next..
you can just get a good OBD-II scan tool that can do live data and the get an android app called “Torque” which can get can the data and display it for you.
You will just need a OBD-II that can send via bluetooth.
Thank you to all with great feedback. Yes, the O2 is original and currently the car has 136,000 miles. I did clear the code before took the car on highway to test drive.
Could the spark plug bank 1 closet to firewall bad? sorry, I don’t have live data scan.. what you think a shop would charge to live data and can they tell me exactly if O2 upstream O2 bad?
I’ll keep you post what I find. hope someone provides more suggestion….
You could possibly use a DVOM, however they don’t update as quick as a good scan tool.
And most shops have a flat rate fee so whatever they charge in your area.
Most shop will have scan tool with live data or this job live data only dealership has graphical ability data?
Hate to take the car to dealership b/c I know they will charge a lot of $$$.
I would call the shop in advance and see what type of equipment they use and what type of certifications there tech’s have.
Anyone can own a good scan tool but it takes knowledge, understanding and skill to use them and analyze the data to successfully diagnose a issue.
What type certification the techs need to understand live data scan tool? does the dealership techs have the ability understand live data tool successfully diagnose an issue?
I would hope so!
There no certifications per se to use a scan tool, like i said, its all down to knowledge and skill of using them to interpret the info.
+1 on finding someone that knows how to interpret the data, guessing gets expensive. Many times the diagnostic fee is 1hr labor in my experience.
ERIC,
What do you suggest? Dealer or independent shop that know how to interpret live data with scan tool. Be honest, I don’t want any guess worki and I end up pay big bucks and the problem still not fix.
Today, I stop by the dealership Acura to obtain OEM spark plugs. Yes, they spark plugs are expensive. $25.00 per spark plug. They told me the spark plug is NGK has platinum spark plug. not sure if they are right?
Went head bought 6 OEM spark plugs and today I replaced all 6 old spark plugs to NEW OEM spark plugs. The old spark plugs on the engine was aftermarket NGK match part #, but I want go back to OEM to be safe.
Updates…. After replaced all 6 new OEM spark plugs, I did reset the check engine light by remove the negative battery cable. Took a car for a drive test on the highway about 50 miles, the engine did came back again. THIS time I am mad….
Have to say, the car has better gas response (power) after replaced to OEM spark plugs.
While I were at the Acura part dept., I spoke to one of the technician work they. He told me this… HOpe someone feel me in if he is right.
He mention to me … There are 3 possible problem that can cuase the CEL with code P0172.
1) loose of vacuum
2) bad O2 Sensor
3) might have bad spark plugsNow, the problem 3 has eliminated. Is he right the possibility cause the check engine P0172?
If I am right on Honda car, O2 sensor would have a different code CELthan P0172, right? CEL=CHECK ENGINE LIGHT
Eric, I want your suggestion or someone… I am running out solution with this CEL code P0172. Right now, I am thinking take the car to shop that have scan tool? But I don’t want they do diagnostic and tell me this and that….replace part and the problem still there…..
What question I need to ask when I call to verify if they know how to interpret live stream data scan tool?
I would think a dealership can handle this type live data scan and able interpret the real stream data on the scan tool. A independent shop can do this type of work or I have to bring in dealership?
Need suggestion…. DON”T want to be guess game and cost me big bucks… Hope dealership would know exactly bad cause P0172 code.
NEED HELP, and I am RUNNING OUT SOLUTION.
That code means the system is reading ‘rich’ meaning it sees too much gas and not enough air. There are a lot of things that can cause this but I don’t think replacing the O2 is the place to start unless you can put your eyes on the scan tool data to see if it is actually reading rich or not. As you suggest you want to verify the problem and then work it from there. As for who is capable, well it’s hard to say if I’m honest as I’ve seen dealership techs that weren’t up to the task but others that were. I think if you take the time to explain the issue and the things you have already done to the person that is going to work on your car you should get a result.
I’m thinking that you might want to try a power balance test just to see if you have one or more cylinders that are effected as a bad coil pack could cause that code because it will not fire the mixture properly and as a result it would read rich to the computer. Here is a video on that process.
Hi Eric,
the code 6 cylinder misfires went away after replaced two bad coil packs. DO you think I still have a bad coil pack on the engine, but not present a CEL? a bad coil pack should show up CEL, right? Could the coil pack is short intermitting and not show up CEL?Updated…
Purpose: This is what I try to isolate today if P0172 BANK 1 SYSTEM TOO RICH code goes away, when I put all new OEM coil packs on number spark plug 1, 2, 3.
Before I still have the code P0172. I have coil pack spark plug #3 (old coil pack), #2( NEW OEM coil pack) and #1` (New OEM coil pack)..
#4 (old coil pack), #5 (old coil pack) and #6(old coil pack). Then code came back after 50 miles drove test with P0172.Right now, I have spark plug #1,2,3 with new OEM coil pack. and #4(old coil pack), #5 (old coil pack) and #6 (old coil pack). Then I reset CEL, and took a road test on highway 60 miles. SO FAR, no CEL came back again. I can’t say 100% this will do the trick, but I will keep you posted.
Does anyone know how many miles before CEL come back again? After 1 week driving, the CEL does not come back…Is that mean the CEL fixed.
I took Eric advices, I try this to isolate if another coil pack still intermitted.
If the PCM see’s a misfire once, it will store a pending code. It will not illuminate the CEL. If the same fault appears again on the same cylinder and it already has a ‘pending code’, it will finally illuminate the CEL showing a class B misfire. A flashing CEL is a class A misfire.
So, it may take a few drive cycles for the code to come back.
Keep us posted.
More updated..
dreamer2325 was right about CEL came back after more few drive long distance.
Purpose: This is what I try to isolate today if P0172 BANK 1 SYSTEM TOO RICH code goes away, when I put all new OEM coil packs on number spark plug 1, 2, 3.
THis time, the code P0172 went away, but codes all 6 cylinder misfires came back. My purpose was right because it eliminate code P0172 went away… and now I know I still have bad coil packs that cause the codes all 6 cylinder misfires… I am very happy!
YES, I am happy. Eric was right… I still have 1 or 2 coil packs are still bad, but this time I have all 3 OLD coil packs on spark plug #4, 5, 6. #1,2, 3 are NEW OEM coil packs.
Stop by Advance Auto parts, they do have new coil pack for $65 each. Not sure if they are good to buy? the coil pack look exactly like OEM, but I am not sure if they’re any good near OEM coil pack.
Eric or someone can comments on this… SHOULD I stick with OEM coil pack or aftermarket COIL pack good as OEM?
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