jason5391

I performed this process over the New Years weekend. Made a big difference. Thanks.

JoshG

how was the difference jason? did u also replace the knock sensor? did your car feel alot different after this job?

marktab

You're welcome

The hacking allows the nut to come off. You will have enough clearance to wiggle out the tube. And in any case, the part I hacked off doesn't have threads anyway.

marktab

Excellent You're welcome

john@cpswi.com

Got the two egr tubes off.


I tried lots of things, but in the end the hacking of the bolt did work best. I did not try a side dremel cutter as I didn't think it would fit, but I did try a straight cutting bit (9901) on one and it bounced all over the place and took just as long. The hacking took a lot longer than 30min and you can't see what you're doing so you're always wondering if you're getting it. But once you get a little groove it becomes easier.


If you don't care about the car, it's much easier to cut the tubes for "the device" and get it out of the way and disconnect the big tube (which is coolant and you will end up with a lot on the ground). If I had to do this again, I'd remove the hood--the sightlines are just too cramped.


After hacking, I needed a stubby non-ratcheting wrench to get out that nut on both cars. Too cramped around the bolt, and in the area in general.


Of course, the bolt was seized and you can't get any leverage with a stubby wrench. Used a ton of penetrating oil and tried many combinations. Finally what worked for me was to use a foot long plumbers wrench: get the stubby wrench in place, hook the plumbers wrench tail hole onto the lower back end of the wrench, then push it towards the firewall just enough to break it loose, then try again with the stubby the opposite way with all your strength.


If this hadn't worked, I was going to buy and use a small nut splitter on it. A small one looks to have a hole about the dimensions of a non-ratcheting wrench and should be able to squeeze in there.

In the end I did have to remove the temperature sensor as it was cutting up my hand. This was on the car where I didn't remove the tubes and device. There is an open wrench you can buy that would be appropriate, and the one I had only did 12mm and 10mm, so I just cut the wire and used another stubby.


Very different experience than the laparoscopic surgery that was the knock sensor, but at least the hard part is done.

svezarov

I have very interesting experience with my CEL - code 0302. My car has about 150k miles and the code started comming last summer. I was planning of cleaning my tube this spring for that reason. I noticed that it would stay ON for some time and after that would go OFF. And would come back in a week or so. So eventually it clicked that whenever I put Shell gas in the car, the code would dissapear and once I put another one it would come back. So about 2 months ago I decided to put only Shell 91 in the car and from that moment on, the CEL has been OFF. I remember seeing these SHELL comercials where they say how their gas cleans you engine etc. and now I kind of believe that...

JoshG

well dude, on 87 gas the maxima runs like crap...93 it'll run the way its suppose to.

svezarov

I have always ran it with 91 (recomended in the booklet). Nothing else. My post is not about that though.

lowceez

Wow, I have a 95 model with 138k on her. I've never done this service. My car runs good but the idle fluctuates intermittently and sounds a little rough. I believe this clean up job will restore normal functions to my Maxima. Thank you for the details and keep them 4th gens rollin'!!

ChelseaMike

Great post. Thanks for taking the time and effort to share this info. Very clear and easy to follow. Gives me the confidence to make my maxima the best she can be!

Daniel VQ30life

iTrader: (2)

Thanks

Johnny9595

iTrader: (1)

This post is a great write up I did this as well. What I would like to find out is if this method did not clear the code what are the next steps I would need to take? I would love a response as soon as possible. I live in CA and have a smog coming up.
When cleaning out my egr tube it was only clogged at the top. Hacking method is a pain especially if you happened to cut it at an angle....

Thank you for any responses I will check this thread daily.

marktab

Hi Johnny -- well hacking is a one-time action -- took me a while.

Just to make sure: just cleaning the tube does not necessarily clear codes automatically. The best method is to use an electronic device (like a code scanner) to clear all codes, and hopefully the code remains clear. (It is possible that codes may clear themselves, but that topic is beyond my scope of knowledge, and though I have the factory manual, I'm not going to look up this topic -- I say just use the device).

ceckard

I have the EGR tube out and cleaned the top and the bottom. But I cannot push a coat hanger through the entire tube (it gets stuck right in the middle where the tube bends). If I fill with a liquid (carb cleaner or something) it doesn't run all the way through. Do you think this is hardened carbon? Should I be able to get all the way through the tube? I may need to buy a new egr tube entirely.

Thanks!

marktab

Hi Ceckard -- On "new egr tube", perhaps that's an answer -- I believe the part is the same as "Spacer Tube - Nissan (14713-40U01)", perhaps you can verify: https://www.factorynissanparts.net/o...be-1471340u01/

On the core question: Yes, the carbon has hardened inside. We have cleaners available, and perhaps one way to help loosen the carbon is to put the tube into a pot of water with a degreaser (like Simple Green), and bring the pot up to just boiling on the stove. Let it simmer for, say, 10 minutes, and try again. I have not used this technique for this application, but have used this method to clean bearings in the past.

I do NOT recommend using fire directly.

A second idea would be to put the tube into degreaser and let it soak at room temperature overnight. Then, go into the tube and try to remove the carbon. I remember using a small flat head screwdriver to loosen the carbon, and though patience, the carbon eventually broke through.

It's just carbon, and the carbon is softer than the metal. Best wishes.

ceckard

I just replaced the EGR tube with a new one. When I started the engine, it kept misfiring and then stalled after a while of sputtering. Any idea what this could be? Now that the tube is clean, maybe it's pointing to a faulty EGR Valve itself?

Thanks!!

reallywildstuff

CS_AR

This is a nice write up. Though I haven't found it necessary to hack the EGR tube bolts.. I loosen and remove the EGR assembly using the two 14MM bolts on the bottom of the assembly. Once those and any bolts used to hold the assembly to vacuum tube manifold are removed, the whole assembly and tube can be moved into a position that allows the nuts to be removed without hacking.

Location for the two 14 MM EGR Assembly Bolts



EGR parts after removal.



LockTite Makes a Gasket Sealer Stick that I use to hold the rear gasket into place during mounting. That has worked out well on since I installed it.



On the last job, I soaked the EGR parts in muriatic acid to clean them up. This is a slow process.



















Then after the EGR parts are all cleaned up, I spray them with VHT Primer and Header paint.

ceckard

Great call! Top gasket was installed incorrectly. Works like a charm -- thanks!!

marktab

Thanks @CS_AR for the updated tips and photos, so helpful. I like the idea of acid, which I have not used myself for any purposes. Though: it's amazing how well the solution does for this purpose. Also, great tip on the proper paint for a final touch.

marktab

Eleven years later: and time for a new cleaning. I updated the pictures because the original host (photo bucket) put a banner on all of them, so I could not see the directions anymore. But I found another photo hosting company: I have all my photos, the original untouched, and the ones with the helpful words on them. And now, I'm going to use my own directions to do my maintenance.

marktab

@CS_AR I updated my photos: time for maintenance (no codes but I'm catching up on the following activities):

• Clean EGR Valve
• Change Spark Plugs (Iridium from Rock Auto)
• Change Transmission Resistor (that was an interesting thread)
• Already changed oxygen sensors (which were throwing a code -- had NGK, but going with Bosch which externally looks like better brand)
• Fuel filter