Mods, I know this thread belongs in the Problems & Fixes sub-forum, but I am hoping it will get more exposure here.

My car has been running well overall. I have about 112,000 miles. I had the timing belt service in the winter time. On Friday, I drove about 90 miles with no issues. About 10 minutes into my return trip on Saturday, the engine started shaking, my CEL started flashing and there was a bad smell coming from the engine bay. I got the car towed home and today I checked it with my code reader. I have the following codes:

P0300 Random - Multiple Misfire Detected
P0301 Cylinder 1 Misfire
P0302 Cylinder 2 Misfire
P0303 Cylinder 3 Misfire
P0305 Cylinder 5 Misfire
P0306 Cylinder 6 Misfire
P1399 Misfire In Any Cylinder

My first plan of action is to look at the coil packs and spark plugs. I think I have read that one bad coil pack may be causing the other cylinder misfires. How should I diagnose the problem? I really appreciate any help that anyone can give!

 

to trouble shoot the coil packs; have the car running.
remove coil packs one by one.
engine note should change when coil pack is removed. if no change in engine note that indicates a bad coil pack

 

Thanks, that's what I did and I found the one bad coil pack.

 

Ya got it, an easy fix !!!
Don't forget the TB intake and EGR passageways may need cleaned.
If the plugs are still original, replace with new "NGK"s.

 

awesome!!!!

a little secret; ive never done that procedure before.
glad I could help

 

Long live the Crabman, Broc is dead !!!
That little coil pack test procedure is well hidden within our site's SEARCH feature.
Ha, hah ..... ya say ya never done it, huh ???

 

I installed NGK Iridiums around 50K miles, and I just replaced the one spark plug from the same bank as the bad coil pack. I'll change out the other 5 soon. I cleaned the EGR at 50K also, so it may be time again to do that along with the TB.

Thanks for waiting to tell me that until AFTER I did it!

 

^ive read it multiple times, but never practiced it in real time.
I have never owned a car with coil-packs. this is my first one!

 

And just to clarify for anyone who may read this thread in the future, I simply unplugged the wiring to each coil pack individually while doing the test, I didn't physically remove each coil pack.

 

^glad you were bright enough to figure that part out.

note to self; just unplug wires.

 

Hmm, was always worried about the effect of crabs on one's brain, but apparently the broccoli hasn't helped to reverse the past damage done. Maybe ya need a more diversified "Green" diet to help.

 

after new coil and spark plug are installed- do an ecu reset by pulling the CLOCK fuse on passenger end of dash for a minute
its the secret backup power to ecu, forces a relearn-clear and reset of all codes

 

I preffered resetting with OBD2 scanner.

 

yes having the cool code reader helps- and for those without, the clock fuse beats the remove battery neg cable= because fuse method doesn't require entering of radio security code.
Soon as you lose power from battery the radio locks down, thinking its being stolen!
the nav unit gives you a little time, 15 minutes? then locks itself
just in case you don't have code handy and don't want to cause yourself to have no tunes, use clock fuse remove- wait a minute and reinsert

register at www.owners.acura.com and safely store the radio nav codes there for free!

 

Thanks, I did see in another thread that you suggested to pull the clock fuse to reset the codes. I also have a code reader so I was able to clear them with that.

 

half of what I write is meant for future ziner readers, or those without 100$ code readers

 

I had two ignition coils suddenly fail at ~110k, so I replaced all 6 of them with Airtex/Wells from rockauto. In this rare case I did NOT want OEM...

 

you mean after only 13 years you experienced a coil failure?
did the spark plugs get changed sometime/ a few months before the failures?
Coils are often damaged when set done on bench, must treat them like grandmas fancy dinner plates!

 

No work was done before failure. OEM coils (and plugs) were in since new, never touched. The point I was trying to make is that TWO coils suddenly went bad at once without warning or cause (besides old age).