dhm118

Guys,

I need some help. I've been chasing after this issue for a while now. Here are the steps I have taken so far:

• Cleaned EGR Ports
• checked spark plugs (ok)
• Coil pack test and changed 1. Fixed the issue.

Then the misfire came back. I checked the plugs and coils again and they were good. From my reading on here, it seemed like injectors could be the issue. But before pulling the plenum off, I had a reputable Honda shop take a look. They ran through their diagnosis, said all was fine without taking the plenum off. Their next step was to pull and replace the injectors. I did that myself and sent them to a shop to be cleaned. Popped them back in and the car ran beautifully. Fast forward to about a month or two of driving of driving and the misfire is back, and its pretty bad. So, I pulled the plugs again. This time, the plugs in cyl 2 and 5 were loose (shop was the last place to handle plugs). I pulled all the plugs and the ones in 2 and 5 were in pretty rough shape. Lots of carbon on cyl 2 and lots of carbon and a little bit of wet oil on cyl 5.

Cylinder 2:



Cylinder 5:



Videos of misire:

Exterior:

Interior:

I'll be replacing at least those 2 plugs. But before taking further steps on my own, I wanted to get your insight. Any help is appreciated.

Thanks,
Mike

dhm118

Also, when I look in the spark plug well of cyl 5, there is a lot of carbon. There is basically none in cyl 4 and 6.

Tosh

Replace all ignition coils even if only one is bad.
Btw, ignition coils can't be tested unless you have a Special Machine...

dhm118

When I said test, I was referring to the methods explained on this forum.

Tosh

Pulling the coil connector while idling?

fsttyms1

^ agree. unplugging them one at a time to see if the idle changes really only works if one is completely failed. Rent a compression tester, test the compression on each cyl and see if they all are within spec. If so move on to replacing coils.

01tl4tl

I agree with Kris- ck the compression 1st, dry then wet (a squirt of oil into cyl then crank engine a few revolutions to spread-then TEST.
If compression is better on 2nd test it has bad rings...the oil created an extra seal. If rings are good numbers stay the same.
and the valves are suspect

you mentioned (in PM) about cleaned egr ports- I want to verify that you cleaned the main passage inside manifold from one end to the other--from the 2 holes under the egr valve to the large opening at driver end of manifold using carb cleaner and wire coat hanger.
Also lube the arm for the egr valve itself

was the TB removed from the intake during cleaning? or was it flipped upside down and around during the process, Exactly how did you clean the egr system?
Did you take the cover off iacv on bottom of TB unit and remove it to clean?

you verified the upper-most gasket went back on right side up? can be installed flipped and cause running problems

but start with compression, determine if thats off and if oil helps it
Dont rebuild a TL engine - grab a used one and install tbelt kit and wp etc- be good for another 200kmiles

200 is actually nothing compared to what some members got from their engine
our mega-moderator fsttyms1 had 300kmiles on his 00 when he pulled it for a cl-s engine and 6 speed manual trans,
Tore the engine down for inspection and cylinder walls still had honing marks- barely broken in at 300,000 Miles!

Keep the oil changed and the wp/tbelt done every 100kmiles for years of enjoyment

Note for the picky: Not all suggestions in this post are directly related to OP- but others in the future may glean something to help them
Also- I didnt watch his vids

dhm118

Just saw this post, sorry for the delay in response. I posted my answers after every paragraph. Work has been crazy lately so I haven't had time to do much.

Also, transmission needs replacement. If the engine passes compression I will be grabbing a tranny from a pick and pull and replacing.

I've already purchased a new vehicle. The goal here is to get this car back to daily drivable condition to maximize resale.

Macioslaw

p1399 p300-06...

I had the same codes, first thing I did was replaced all the coils because my EGR was cleaned, and new plugs were installed a couple hundred miles before

dhm118

Ok, compression test came out ok.

Now what?

I have an Wifi OBDII adapter and torque. Will it help with diagnosis to post freeze frame data or anything else?

Thanks,
Mike

dhm118

Well I think I may have found my problem.



This is what came out of the 4 injectors that were clogged:



lol

So I imagine fuel filter is the culprit. I didn't test the fuel pressure because that adapter is $50+ shipped.

Tosh

Is it sugar?

dhm118

It does kind of look like sugar but that seems rather unlikely.

dhm118

Now that I think about it, the sediment dissolved almost instantly when I washed that glass. Sugar doesn't dissolve in gasoline, according to snopes.

Tosh

Is it meth?

dhm118

lol

dhm118

Welp, cleaned the injectors, inspected the fuel filter, buttoned her back up and she runs like a top.

Case closed.

Tosh

Mystery powder put there by ghost of Nigel Stepney, or just sand?