Rui Sousa

I have a 2001 acura tl with the updated intake with the removable cover (ant farm) not like the 99. I was receiving misfires in cylinder 1 and 5 with random misfires as well. Now what's weird to me is I replaced all spark plugs (ngk platinums) and all coil packs and ran fine for about two months. I also took off my egr valve and cleaned it up and also the passages.. I also cleaned out the small ports after taking off the plate on the intake manifold. I sprayed throttle body cleaner inside the holes and also the throttle body (opened throttle plate with throttle cable and sprayed inside engine) i put everything back together and it started up rough i quickly turned it off then started it again and it was fine only to find out there's surges or hiccups only in highway speeds. No rough idle or anything out of the ordinary ONLY WHEN ON HIGHWAY OR AFTER 50MPH THE CAR HICCUPS OR MISFIRES. Is there an egr port that I'm missing like next to the fuel rail like on the '99s? Or is it a faulty egr valve or maybe blown cylinders? Should i do a compression test? Don't know what i should do next. I know this has been covered many times on here but I'm just stuck any help will be GREATLY APPRECIATED!! THANKS!!

Kris9884

Well replacing all of the coils and plugs without even checking them was an expensive, pointless repair. They either work or they don't, no in between. Now, the obvious thing to do first would be clean the EGR and understand, its going to run a bit sluggish for a bit after since all that carbon and throttle body cleaner has to burn off. I'd say drive it around and let things run their course for a day or two. Also, I assume you've cleared the codes right? If not, go do that and see if they come back, that's the best way to know if's fixed. I literally just did all of this 2 weeks ago and only had to clean the EGR and replace one coil. No codes and runs like new again.

Rui Sousa

I replaced all packs and plugs because i was getting misfires in two cylinders and before it happens to the other cylinders i decided to switch all packs and coils at once. Ive been running the car for a few days but it still surges at highway speed. Through town it's fine. idle fine. Every thing fine besides going on the highway. What is the next thing i should check? compression? Are there more ports under the intake manifold on the 2001 j32a1? I know there's one for the 99 car has 230k miles but is very well taken care of. just dont know what to do next

Rui Sousa

Also I'm starting to think my egr valve is bad because i disconnected it and drove about twenty miles and the surging wasn't half as bad as it was when hooked up. But i don't want to replace the egr valve if it's not broken. Service manual tells me to hook up the battery cable to the 6c connector, but how do i do that? I have a multimeter but am confused on how to. Connect the battery cable to the actual connector. Seems weird to me.

Rui Sousa

Yes i cleared the codes but they came back unfortunately

P0301 p0304 p0401 p0300 p1399p are the codes

What would cause the misfire if I changed all plugs and coils???? And cleaned egr ports.

Tosh

You need to find a local Honda specialist. Such a mechanic might lend you a working EGR valve to rule it out.
Are you caught up on regular maintainance? Air filter, PCV valve, valve adjustment?
I would say if it's idling very smoothly both cold and hot, it would point to fuel injectors and combustion chambers being clean enough (but add a bottle of fuel cleaner with every tank until problem clears or is fixed).
But highway speed hiccups point to fuel delivery (pressure), air flow blockage, or even a collapsing coolant hose. Follow the codes!

I also want to add that you did the right thing by changing all the ignition coils as preventive maintainance...

Kris9884

Yeah I agree in your case, replacing all of the coils was smart, I just thought you were trying to diagnose the problem and went and bought a bunch of stuff. Since they were already bad, best to replace them all, never know when the next is on its way out. If all of that's done, the next easy thing would be to try sea foam or the fuel injector cleaner as he stated ^^^

HairyMonkey019

iTrader: (7)

Do you have water going through your egr?
Check out the thread I just made: https://acurazine.com/forums/2g-tl-p...ru-egr-952273/