Car idles really rough. Shakes while accelerating at low rpms only. If you gun it, there is slight hesitation and smooths out once in higher rpms. Codes for random missfire, and missfire on all cylinders thrown.

Problem started after I filled up the other day. Thinking maybe bad gas in conjunction with clogged fuel filter or something with the fuel pressure system, regulator or pump maybe going.

Cleand EGR and port, helped a little. So i replaced the EGR and have all the same problems. Plugs are new, and tested coils. Looking into replacing fuel filter (in the pump, yeah!) and testing the fuel pressure to narrow down problem.

I have been researching this for days and finally decided to post a new thread. Any suggestions besides the plugs or coils are welcome. I'm looking for serious input cause i just started my new job, which is only 10 minutes away and thankfully i don't have to go over 45.

 

You said the plugs are new. Was the problem there before you changed the plugs?

 

what octane gas are you using?

 

No there wasn't. I changed them about a year ago because they were due to be changed out. Never a problem till a couple days ago after the fill up.

I have only ever used Premium. Around here its 93. Only use Shell and BP Gas as well.

 

Hmm, so no other work was done on your car in the previous week to this problem, only the gas fill-up. That would narrow it down a little bit I guess. If you really feel it's the gas, go to the store and get an octane booster and add it to the take.

Or you can go get some Lucas Injector Cleaner and add that to the take, that stuff works great. Not sure if it will solve your problem but it will narrow it down even more if that doesn't work.

Also, how many miles on the car?

 

octane boosters don`t do much so I wouldn`t recommend that but try the injector cleaner and maybe just a new tank of gas

 

Test the fuel pressure. Are you hearing any vacuum leaks?

 

Only reason I recommended that was because if it was a low test grade of gas then it might help clean it up.

 

it's most likely bad gas. i had to stop at a shitty little town to get gas and had all of the same problems. how much gas have you used. try filling it up again at a different station and add some lucas fuel treatment. i would probably do a filter change too.
also check your gas cap. i'm not sure if there is anything wrong or will have any effect on the car, but it will throw a code if the cap is cracked or not screwed on all the way.

 

every 6 months or so I throw in sunoco 100 octane fuel to blow my baby out! that might help if you have that available. Beats the crap out of any octane booster.

 

im having the same problem as u. wtf. misfires at cold starts. then sometimes during driving at random times. all i get is a p1399, manufacturer controlled ignition malfunction or misfire. seem like we both have the same problem

heres my thread
https://acurazine.com/forums/2g-tl-problems-fixes-117/have-wierd-missfire-problem-759037/

 

yea me ive been getting misfires since yesterday. trying to figure it out.

 

I got 8 codes last week. P0300 through P0306 and P1399.

I cleared the ECU and it has yet to come back. OP, you can try clearing them, but my car wasnt showing any signs of a misfire. The light just came on while cruising.

 

i get a slight misfire. i also get those codes but only when i go wot and teh check engine light flashes. but just cruising or at idle i get p1399. ive had it with the tl. great car, but its giving me a headache already

 

I havent read your thread, but have you checked the egr valve? Cat?

 

havent checked egr valve. not throwing any codes for o2 sensors and i did the seafoam treatment through the vacuum line and some white smoke came out (3rd time i did it within 10k miles). so im gonna say its not clogged

 

The one problem I have with Seafoam is that it does clear out the engine rather well, but all that crap has to go out the exhaust. The cat is a catch-all for that shit. Did you visually inspect it?

 

but if the cat is warm (operating temp) then all that crud should get cleaned out. plus the seafoam will deteriorate it. my 2cents
didnt visually inspect it.

no cat on my cl-s wtf

 

There are 115,00 on the car. I've had all the scheduled maint done up to this point and always change the oil (synth).

That was the test I was going to do today. Checked all hoses and then went to the store to get a gauge to test. No places rent them, they wanted $45 for a tester i'd need once! I passed and continued to trouble shoot.

That was the only code i was getting to start with. It was really pissing me off cause every other thread i found on this was throwing like 8 codes or just more than one useless one ya know?

So I wanted to answer all your questions first before I broke today down. I made a slight mistake and didn't let the engine warm all the way up before i tested each cylinder. So this morning before work i let her warm up and pulled each coil plug, one by one. And presto! Middle cyl on front bank was bad! Didn't have anymore time before work so tom first thing i'm testing to see if its the coil or the injector. Either way i'll have a new coil waiting if it turns out to be that. if its the injector well... FML! Not as simple but at least i've narrowed it down. Thanks for the help guys.

Tom, I'd check your EGR that def seems to be a common problem. I don't know how much you looked into the missfire. But I was so happy when i started pulling plugs and found the one cylinder was the only bad one! Let me know how your tests go.

 

i changed all my injectors from my spare engine (worked great before i tore it apart) and. misfire went away. then came back a few days later all coils were changed with good working ones from my old engine. that had no effect on the misfire at all.

but during the weekend when the cars misfiring ill start to unplug the coils to narrow it down to a cylinder or more

 

On the way to work today I went wot and sw the check engine light flashing. Cel did not stay on. But I pulled the codes and cyl 4 and 5 misfire, random misfire and manufacutrer ignition malfunction codes cam up.

 

I hope my misfire is a plug or coil and nothing serious. Not to threadjack you Dave but from everyone experience what's the ususal cause of misfires. I just got some money to continue with my lip kit project and it's looking like it might go to this problem.

 

See this is why I buy gas from only ONE brand.

Shell V Power... which cleans ur heads and injectors while u drive.

BTW super high octane is worthless on cars like ours unless u are boosted. As a matter of fact octane can make u lose POWER since it is only necessary to have 91 (roughly) to prevent engine knock and whatnot.

If you do not believe me, do some research about gasoline with regards to engine requirements.

My dad also works for shell and is an engineer so I know a few things about fuel. And till I die, I will only use shell premium fuel on my cars.

 

I use 93 bc that's what the stasion has. 87 89 and 93. But 91 or 93 both work the same. I'm gonna fill up in a few hrs and let u guys know what's up

 

just use shell and you'll know u'r not getting gas from a 40 year old gunked up tank!! ;-)

 

Ha Progression, I think most of the people in here who are commenting on this thread are pretty knowledgeable about cars and are aware that bad gas is not a good thing.

As for Shell V-Power, you realize you don't need those detergents in your car on every fill-up. A good Italian tune-up each time you fill up probably cleans out as much carbon as the additives in Shell's fuel.

 

lol my dad is from italy. hahaha

and I kno u don't NEED those detergents, but there is no harm in getting it all the time to ensure you aren't getting crappy gas. which OP sounds like he's experiencing.

all i'm saying is it pays (in this case) to be a loyal customer.

I never did trust those SOLO fuel stations, they are grimey and they look like their product is compromised..

they (the small stations) get their fuel from the ends of the crude batch, so naturally the bigger companies get the cleaner crude, better gas

 

I disagree with you. It is not only necsessary to have 91 octane at a max. I have heard acura/honda products ping and knock even with 91 octane. Higher octane is not worthless as the higher the octane then the better resistance you have to detonation/knocking. The acuras don't need 100 octane straight but it doesn't hurt to get a better rating than 91 in a vehicle that requires premium. Our ECU adjusts timing as needed thanks to the knock sensor. Some of the States have 93 and 94 octane as their Premium fuels vs Arizona's 91 octane. I can't tell you how many TL's, CL's ping on 91 because there is to darn many of them that I have heard.

in my accord V6 I use only 91 octane and mix it with 100 octane to clean out the system every 4 months or so. 100 octane is a much better alternative than a octane booster and does a great job of cleaning out the fuel system!

 

could be fuel pressure, clogged fuel filter, wiring might be messed up at the harness for the injectors. Sounds like it's running too lean and that's why it hesitates when you gun it and it wants more gas.

 

Alright problem solved tonight. I narrowed it to the one cylinder yesterday like I mentioned. Pulled the coil from the bad cylinder and bam! She runs like a champ now! problem solved.

Even if you swapped working coils Tom, one might have gone bad. That one bad coil was causing my entire system to go ape-shit. was throwing missfire codes on every cylinder.

Thanks for all the help guys.

 

cool. ill try that this weekend

 

good luck man!

 

multi cylinder misfire codes are often 1 bad coil, sometimes happens after plug change and a coil got mishandled- they are fragile inside

EGR port plugging occurs every 75kmiles and needs to be cleaned manually from the manifold

Seafoam or redline SI-1 will clean out carbon from the pistons and valves- the modern ethanol 10 gas leaves behind more crud than old gas standard did- the TL/CL suffers as a result

If you are getting detonation on 91 you need to do a decarbonizing of the engine

 

Having this problem as well. When i accelerate maybe @ 4k rpms it starts sputtering, i kno i need a tune up i just hope it's nothing serious. If it's just a plug I'll change along with the coils. But I will take suggestions!

 

I finally figured this one out guys, check this thread before someone who doesn't know what they're doing gets you to spend money on repairs that aren't needed https://acurazine.com/forums/1-2g-mdx-2001-2013-166/2004-mdx-problems-vtm-4-check-engine-762423/

 

Before you spend any money just do a quick check of each coil pack and cylinder. Put your hand on the motor and feel how it runs at idle. Pull the plug to each coil one at a time and if one doesn't change how it idles that's your bad one. If that doesn't find anything you can start ith a quick cheap tune up.

 

I'm trying to fix my sons 2001 cl 3.2 with similar problems. I'll be honest it has been awhie since i've been under the hood! The first thing I want to do is check the coils. I know they are under the top cover and that I should have the car running while checking them.

I have not seen them yet but is it just one connector that i pull off? and uhh...could i get shocked?

How do I clear the ECU?

Is Lucas Injector Cleaner pretty easy to use?

Where is EGR value and how do I check it?

I'm hoping that with all of your ideas I can fix it. The worst case is a valve adjustment but maybe one of these will work first.

Thanks

 

You can unplug them while the engine is running.

To clear the ECU, remove the #13 15amp fuse from the passenger side interior fuse box. Its the clock fuse, and will clear the codes without erasing the radio presets.

The EGR is located to the right of the front bank. It is a tall cylinder, almost looks like a silo with a connector on it. Im not sure how you would test it, but you can remove it and make sure it isnt clogged. There is also a port that runs into the intake manifold itself (you need to remove the maniifold cover, not the plastic part but the aluminum part) closest to the throttle body. It is usually filled with crusty shit and clogs easily.

How long have the issues lasted on your car? Can you describe everything that is happening and did you get the CELs read?

 

The issues just started two weeks ago.

The first mechanic thought it was the computer so he took it out and replaced it with another one. The problem remained so he put the original back in. Recommended we go to an Acura dealer for a diagnosis. Here are their results.

CODE PO 300-306 ALL CYLINDERS MISFIRING. DIAGNO SED VEH AND SWAPPED COILS WITH KNOWN GOOD COILS AND MISFIRE WENT AWAY EXCEPT WHEN VEH STARTED COLD. RECOMMEND REPLACE ALL COILS AND PERFORM VALVE ADJUSTMENT.

CODE 01-1 POEN CIRCUIT IN DRIVER AIR BAG, WOULD NEED NEW HARNESS TO START.

2 issues 1) engine 2) airbag

The airbag light has always been an on off issue since he bought it used.

The dealer said it is a wiring problem to the airbag not the bag itself.

I don't know if it is related but the first mechanic tried to swap the air filter with a Honda and it didn't fit so he put the original back on. The original that came with the used car is not the one that would have came with it new. The other owner put on a cold air intake for better performance. The mechanic was trying to put on the Honda filter so that the car would pass smog. A week later the car started having engine problems.

He has had the car for about a year.


The dealer wants 2 grand to "fix it" but after reading about the problems like this i see there is no guarantee that his ideas would work. So i'm giving it a try.


Thanks

 

did you check the spark plugs? even if you checked the coils the sparkplugs can still make it misfire. the airbag part might just be your seatbelt buckle. When this happened to me it said random misfire. misfire 1,2,3,4,5,6. I changed all 6 plugs and all 6 coils everything was back to normal. Did you ever check the Intake manifold gasket if you put that on upside down you also get random misfires.