Hell I can't even figure out which ones they are. anyone got asny ideas what would cause this and which cylinders they are?

 

firewall
123
456
radiator

 

How did you determine they're not firing? If its misfire codes they will usually be mostly working but have a misfire from time to time such as at idle when cylinder pressures and effective compression are down assuming its due to low compression. It's either fuel, spark, or compression lol.

Is this a manual transmission?

 

I bet you its loose spark plugs... they are notorious in these engines, especially cylinder 5.

Have you ever had your spark plugs changed? What is the mileage on your vehicle? If you have not, I would start there. If not, you will most likely need to replace them, and have a helicoil threaded in your cylinders. Then you will need to scope into the cylinder head and make sure there are no chunks of old thread, spark gapper, or spark plug diode inside there. Your best bet would be to spray some brake cleaner inside of there and vacuum everything out and repeat this at least twice. Then check the valves to make sure that no pieces of metal adhered to it. Otherwise you may need new valves if you didnt catch this in time.

 

My engine light came on so I took it to autozone and they put they code reader on it. It said no spark on cylinders 3 and 5. Not sure how they could read that without the car running? The car has 77k miles on it and the plugs have never been changed. seems funny that 2 of them would go bad at the same time tho.

 

They can read it because the codes are stored (engine does not need to be running to check CEL codes). Importantly, other than the CEL, does it run properly, or do you hear any tapping noises at the engine?

 

checked the plugs, tight and seated correctly. I'm leaning towards the coil packs. The car is aan automatic

 

no tapping or otherwise weird noises. Was running great and I came back from a 300 mile car trip in the rain and then all of the sudden ran like crap with the engine light on.

 

Has the windshield ever been replaced? Were you running the AC or defrost?

 

not that I know of on the windshield. I was running a/c, it was 85 degrees and raining.

 

check the connectors to the coils. If there's an exposed cable or dirty connection it can cause some problems.

Also, you didn't run out of gas did you?

 

I vote for resetting the MIL and seeing if it comes back. maybe nothing at all. How does it drive? if 2 of 6 cylinders are not firing it would be painfully obvious.

 

nope no gas problems. had 1/2 tank left when it happened so I think I can eliminate bad gas.

 

it drives like it's miss firing. steady, no difference whether I floor it or just cruise, still runs rough. How do you reset the MIL?

 

One more piece of data- what's the actual codes (the numbers from Autozone) that were thrown? That would help in the diagnosis quite a bit.

 

he didn't actually give me the codes, just said the reader said no spark cylinders 3 and 5.

 

Take it back and get some actual codes- CEL lights when read give a specific diagnostic code, not just that those 2 cylinders weren't firing. The numbers would be really helpful.

 

yeah I can't believe I didn't get the codes, brain cramp I guess.

 

the codes were p0303 p0305 p0306 hope that helps.

 

Those are misfires on 3,5 and 6. Is this a manual? sure sounds like an over-rev. or possibly a MICU / ECU with some water

 

That's just misfires on 3-5-6.

Question, when you "checked" the spark plugs, did you actually pull them out of the motor? I wonder if your problem is as simple as needing a spark plug replacement.

 

Without more information, it can be sooo many things.

I would: Visually check spark plugs,check for spark or Clear the codes >swap the misfiring coils with other cylinders>check for misfires and see if the misfires follow the bad coils..to start with.

Spark plugs
ECM
Coils
Injectors
Map sensor
Vacuum leaks
& More..

 

no it's an auto. any idea how to dry out the ecu, or where it's located so I can check?

 

no I didn't pull the plugs out, I will.

 

the ECU is located underneath the center console.
Under the A/C, Nav, radio stack.

 

well that looks easy to get to! LOL!!! But how can that get wet?

 

one of the question in the thread asked was, "were you driving with the A/C on"

there is an A/C drain tube that occasionally gets clogged. and guess where it conveniently drips onto?


we have ruled out the "6mt and over-revving"
we have ruled out loose spark plugs.

 

I drive with my ac on most of the time so that makes sense. would drying it out reset it or do I have to have someone reset it?

by the way thank you for your help.

 

ok finally got around to working on this again. I decided to go ahead and replace all the coil packs and plugs. But WTF? the number 3 coil pack was melted to the wall and I can't get it out. the top of the coil pack broke of when I tried to remove it. Has this happened to anyone else? how did you fix it? I'm pretty handy and don't wanna take to dealer. Also I read that the a/c drain tube could of caused this by dumping on the ecu? HELP!!!!!

 

We already helped.

Did you check the ECU like we said to?

 

you found the culprit!!

water dripping onto the ECU causes the coil packs to melt!
break off that coil pack and replace it!

you might want to check the ECU and get that A/C drain line unclogged.

 

^

 

does anyone have any tricks on how to get the melted coil pack out? is it a "just fuck with it" till it comes out or has anyone had any luck with this?
by the way, a big thank you to all that helped me this.

 

anybody?

 

^i mean, its held on by a hex head bolt. if it has melted, and cant fit a hex head or an allen key, I would be trying to pry it off, even breaking it to get it free.

you're replacing it, anyway. might as well go the brute force way.

 

the problem is the head was already broke. it's the tube I can't get out.

 

yikes, looks like you'll have to manipulate it in some way so that it will come out.

needle nose Pliers?

 

Angled needle nose pliers for suree. Twist back and forth until it comes out.

 

Follow this procedure to determine if a coil pack has failed on an Acura TL 2004-2008

When you discover your engine is running rough and continue to drive it after the flashing CEL illuminates your computer is registering multiple failures.

Clear CEL, start the car and run till your CEL re-illuminates, then immediately shut the engine off and read the CEL. This process will give you a clean reading on which coil pack has failed. Using this method, as it has been the case on three separate occasions. I then replaced the CYL. # 5 (P0305) with a new coil pack and problem solved.

This procedure has worked three separate times to identify the right coil pack for replacement. Hope that helps on coil pack issues. Later

 

If you've had to replace 3 coil packs, you might have a bigger underlying problem\s....