Issues resolving P0401 Code
Hello fellow Acuraziners,
I have a 1999 Acura TL that currently has 249,000 miles on the odometer. I am having a slight issue with my vehicle that I am hoping someone will be able to assist me with. About a couple weeks ago I received the infamous EGR Insufficient Flow code, and I have been struggling to clear the code ever since. I cleaned the intake manifold ports throughly.. the manifold simply cannot get any cleaner! Would the EGR port on the lower intake cause this code to stay active? If so how can i go about cleaning this port? My thought is that you can't spray a whole can of carb cleaner into this port like you normally would with the manifold. Thoughts???? |
"A code P0401 most likely means one or more of the following has happened:
intake manifold doesnt sound like the main cause in this case. im leaning towards carbon buildup, which is usually very effectively cleaned out using seafoam. heres a diy thread on seafoam https://acurazine.com/forums/9161152-post/ i cant guarantee it will solve the problem, but it's worth a shot :dunno: try googling P0401, look through forums, you might find your answer hope this helps |
seafoam wont fix this
Did you remove the intake manifold from the engine and run carb cleaner and a wire rod thru the port,, and all the passages- clear thru to the egr valve ?? cant be done `on the car` correctly! on egr valve: clean and lube the operating arm remove valve from manifold and clean ports there too |
Originally Posted by 01tl4tl
(Post 12672351)
seafoam wont fix this
Did you remove the intake manifold from the engine and run carb cleaner and a wire rod thru the port,, and all the passages- clear thru to the egr valve ?? cant be done `on the car` correctly! on egr valve: clean and lube the operating arm remove valve from manifold and clean ports there too Thanks for the feedback. |
ck our diy on `thermoblock spacer install and EGR cleaning`
it shows how to do it right You are missing the entire length of the passage thats clogged, and the valve end will look the same- cant do this job by cleaning just the `end` opening You can remove the sensors and end plates- run carb cleaner (many use 3 cans) and a Wire coat hanger or similar rod thru the passage and out the other end- run cleaner thru the throat of tb, thru egr pathway, flip manifold throat down and spray everything again -flip back up and repeat final time rinse the manifold with water, dry FULLY etc etc the 8mm drilling was for acura to install a smooth sleeve in the bore so it didnt clog as fast,,about 40-50kmiles before then,,now 75k~ and needs cleaning Until you push a rod thru from egr valve port to the port in manifold- you are not done and will keep getting codes and poor running |
Originally Posted by 01tl4tl
(Post 12677383)
Until you push a rod thru from egr valve port to the port in manifold- you are not done and will keep getting codes and poor running
EGR port reference on item #12: http://www.acuraautomotiveparts.org/...ystemcomp=List All&vinnoT=&trim=&trans=&view=normal I guess I was confused because I didn't recall the DIY mentioning about servicing the port in the car. In the past I have only followed the instructions related to the manifold itself. I guess with the high mileage I have (especially given that I've never cleaned that particular port), it is to be expected. Thanks again! |
So after discovering the EGR passage on the car was plugged through the cylinder head, we were able to clear everything out pretty good. Cleared the code, drove it around for an hour and checked the ECU to find no pending 0401code...yaayy!! This has by far been the most challenging EGR task ever done to date on this car.
01tl4tl.. being that my EGR passage was pretty bad through the lower intake, I was thinking that maybe I should jump on the Seafoaming bandwagon. No telling what 249,000 miles has done to my valves, pistons, etc.!! My question is in regards to the spark plugs. With just shy of 50,000 miles on them, I am not quite ready to swap them out yet. Will doing this seafoam require me to change out the plugs at this time? If so, perhaps I should wait for another 10-15k miles to do everything then. Thoughts?? |
If concerned about it:
you can avoid any chance of loading up the plugs with crud by doing the gas tank method 1 can to 8 gallons- just under half a tank do that twice and a shot thru the TB with some carb cleaner or deep creep and you are done that will get everything the vac port will- in a slow gentle manner over a tank versus blaster method which depends on a good afterdrive to blow the crud off the plugs As a general question- its fine to do via master vac port with 50k on the plugs its all in the burn off drive once you loosened crud with high miles I would throw a new $3 oil filter on, add 1/2 can to oil and drive 150-200 miles,,up to 500 if you commiute a lot in a week change oil and filter after 15 minute warmup drive Thats going to remove years of sludge, put it in the filter- and ready to drain the rest by the oil pan plug-- !Important its warm 15 minutes freeway drive so crud is liquidfied See www.seafoamsales.com there are a few pages of FAQs and methods to seafoam. that 2000 rpm blast does an awesome job~ |
we need to redo the egr cleaning DIY thats for sure!
Use shop vac to suck out whatever you can after poking wire in lower manifold If it looks like carbon buildup- scrape it off! seafoam wont help this problem :( EGR = Exhaust Gas Recirculation= some exhaust gas is routed back into the manifold and cylinders for reburning..smog control, reduced power.. To my knowledge, seafoam wont be much use by the time it goes thru the exhaust process~ all we can do is manually clean it every 75kmiles for 00+ cars, or less for 99s, with only 1 port they clog faster Why doesnt the repair manual or owner book call for this?--they didnt know a decade+ ago when the books were written and its never been updated--thats what azine is for!! to help you find things techs on the street wont know |
thanks
|
Originally Posted by 01tl4tl
(Post 12682814)
If concerned about it:
you can avoid any chance of loading up the plugs with crud by doing the gas tank method 1 can to 8 gallons- just under half a tank do that twice and a shot thru the TB with some carb cleaner or deep creep and you are done that will get everything the vac port will- in a slow gentle manner over a tank versus blaster method which depends on a good afterdrive to blow the crud off the plugs As a general question- its fine to do via master vac port with 50k on the plugs its all in the burn off drive once you loosened crud with high miles I would throw a new $3 oil filter on, add 1/2 can to oil and drive 150-200 miles,,up to 500 if you commiute a lot in a week change oil and filter after 15 minute warmup drive Thats going to remove years of sludge, put it in the filter- and ready to drain the rest by the oil pan plug-- !Important its warm 15 minutes freeway drive so crud is liquidfied See www.seafoamsales.com there are a few pages of FAQs and methods to seafoam. that 2000 rpm blast does an awesome job~ 1. Can I swap oil filters without draining the oil? If so, should I expect to have a small puddle of oil to clean up once I loosen the filter? Also, should I swap out the filter while the engine is warm or should I wait a couple hours until it cools down? 2. In regards to the seafoam spray, how much should i spray inside the TB? Although I haven't yet read up on how to use the Deep Creep/Seafoam spray method, is it safe to assume that I would spray with the TB plate open so that everything will make its way to the intake upon putting the air tube back together and starting the engine? Thanks again! |
Originally Posted by 01tl4tl
(Post 12682828)
we need to redo the egr cleaning DIY thats for sure!
Use shop vac to suck out whatever you can after poking wire in lower manifold If it looks like carbon buildup- scrape it off! seafoam wont help this problem :( EGR = Exhaust Gas Recirculation= some exhaust gas is routed back into the manifold and cylinders for reburning..smog control, reduced power.. To my knowledge, seafoam wont be much use by the time it goes thru the exhaust process~ all we can do is manually clean it every 75kmiles for 00+ cars, or less for 99s, with only 1 port they clog faster Why doesnt the repair manual or owner book call for this?--they didnt know a decade+ ago when the books were written and its never been updated--thats what azine is for!! to help you find things techs on the street wont know |
what seafoam spray did you find? deep creep is the name of its aerosol version
Engine off- spray the air plate on both sides and edges- use right hand to open throttle at spring area to open plate (lube those too) wipe up runoff!!- start engine- with tube removed to air filter,,will run bad as seafoam moves thru, use throttle control to keep running I would do the air plate on seperate day, engine cold then do warm up drive and use the Master vac port with the spray do the blow out drive and let it cool off Then do the TB air plate when its cold You add seafoam as the engine will process it- no more than 50/50 dilution with the fuel or it stalls..you get a feel for it pretty quick,,but dont slam a bunch in at once oil filter, turn wheel for better access from right side, many can fit under far enough without lifting the car up to reach the filter. Get the filter broken loose- then slide a gallon size ziplock bag over it- slide all the way on to it. spin filter off and the contents of filter are contained A small amount of drip happens on car and maybe the ground keep rag and carb cleaner handy! Wipe the filter mating surface clean and be sure the old rubber sealing ring came off with the filter buy 1 extra qt oil to replace whats lost in filter swap, so 6 qts total |
Originally Posted by 01tl4tl
(Post 12685241)
what seafoam spray did you find? deep creep is the name of its aerosol version
http://www.seafoamsales.com/sea-foam-spray.html I found the Sea Foam aerosol Spray product from Advance Auto Parts. Not sure what the difference between this product and the Deep Creep, as they are both made by the same manufacturer. Can I use this product to spray into the vac port the same way we would do with the Deep Creep? Or would you recommend me taking this product back and going for the Deep Creep instead? |
no its fine--
looks like they removed one ingredient- the stay behind lube possibly, so cars with super trick intakes could use it. I have the 3 foot straw but not required on TL Based on their website- go thru the TB throat, past air plate, and the master vac port as usual Keep rpm 1500-2000 and half a can or so for one treatment wait 10-15 minutes and do the afterdrive repeat in a week or month for fullest effect then good for a year |
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