kind of dumb EGR question....

[kafanylovesme]

I removed my EGR valve today to replace it with a brand new one. I'm not sure where it leads to, I believe Exhaust Manifold but the spot that the EGR hooks up to the engine is REALLY dirty inside. I was wondering, is there any way to clean it up in there before i put the new EGR in? Like some way of flushing all the dirt out or something? I know it might be a dumb question, but hey any help is appreciated. Thanks

[jesuchristo]

that's pre-cat exhaust going through that hole. You don't need to clean it unless your super anal. I would think that any cleaning methods would just flush that dirt crap through the engine, not good maybe?

Unless you wanna take the intake manifold off, I'd leave it alone

[Nismoknightska-t]

i wouldn’t worry about it

[S130oner17]

well i can tell you that if your going to be replacing the EGR i would clean the EGR passage in the intake manifold as well, i can tell you from being a Toyota Tech that the EGR pipe and EGR passage get clogged and cause random or multiple miss fires all the time. the KA im rebuilding (till i can afford and SR) only has 130k on it and the EGR passage and pipe was all plugged up, just take some brake clean, a pipe cleaner (metal one) and a flat head screw driver to clean out the carbon and exhaust build up and then your check engine light wont play peek a boo with ya. you can do all that if you want if your going to be using that engine for a while, but if your gonna do a swap soon i wouldn't worry about it.

[RedtopTech]

if you are replacing the valve to fix code p0104 [insuficient flow] than the cause was most likely the carbon build up. to test this simply run the car at idle. than use a vaccum pump to actuate the egr valve. the engine should instantly stall. if not than your valve or ports are clogged. if it does stall than you want to test the egr solenoid. to do this simply apply vaccum to the solenoid. make sure the solenoid holds this vacuum. than apply 12volts. the solenoid should bleed off the vacuum

[kafanylovesme]

Thanks a lot guys. I think i'm going to go ahead and clean it because I will be using this engine fo a while. If anyone else has any info, please post here.

[Z U L8R]

amen @ clean the passages too
you can use a hanger, and it's only carbon, trust me there's a shit ton more on the tops of your pistons i'm sure hahaha use carb cleaner, brake cleaner will work but is not o2 sensor safe, so use carb cleaner

egr valve dilutes your cylinder head temp by recirculating exhaust gas back into your intake. you're thinking "exhaust gas is hot, how the hell does it lower my cylinder/head temps?"..temperature wise it is "hot" but in comparison to your combustion chamber it's not. just like your anti-freeze would burn the shit outta your skin...but it cools your motor, same thing. but anywho, the unburned fuel and other mixed gases in it helps cool your cylinders and reduce the chances of spark knock aka DETONATION. the hotter the cylinder temp, the more nitrous oxide (harmful gas aka NOX) is produced. therefore your egr valve and your catalytic converter work hand in hand to lower your NOX readings. for driveability and emissions purposes egr valve is a good thing. for performance purposes,where emmissions don't matter, delete egr and replace with intercooler and good tune =]

if you've ever looked at a nissan throttle body, it has coolant flowing through it. it does that to raise the intake air temp so your car doesn't run as lean. lean = power but lean also = heat, the extra fuel aka RICH cools the cylinder wall. running rich is safer than running too lean. anywho the car running lean heats up the cylinders and thus create NOX. on a performance motor , you want the air the engine ingests to be cool/dense, that's why there's intercoolers, and cold air intakes etc etc. anywho, hope you learned something :P

gl
Dave =]

[kafanylovesme]

Thanks a lot for that info Z U L8R. I decided to clean the Intake Manifold and the Exhaust Manifold while im at it. Intake Manifold is off already.