The Acura Legend & Acura RL Forum - View Single Post

BlackBirdVQ · 02-26-06, 11:04 PM

Make sure the timing belt is installed right, all the hoses are hooked up and the EGR port inside the intake manifold is not clogged up.

I always take the EGR port plate off the back of the intake manifold and clean all the snot out of the port. Last Legend I did HGs on, had alot of hesitation before the HG job, after I got done with the hesitation was completly eliminated. Acura has a TSB on EGR port clogging which can cause hesitation and drive line vibrations on the MDXs. Similar principle applies to the Legends, but none of them but the 95 models will code for a EGR problem. 95s will code saying the EGR valve is bad, but in reality the port is clogged and it needs to be cleaned. 96-up RL and TLs with the C series motor will code with a P0401 EGR flow insufficient code, I get to fix alot of independent shops misdiagnosis because they always install the valve and never clean the port out- causing the light to come on within 100 miles.

Port can be cleaned without taking the intake manifold off, you just need to remove the EGR pipe that runs from the back of the right cylinder head to the intake manifold-remove the black box on the firewall where the MAP sensor sits in to see the pipe better and get at the bolts. Get a small but long drill bit and stick it in the EGR port hole (where the EGR pipe bolts up too) till it pokes a hole in the EGR port hole-there is a hole there that will be all carboned up. You will need to gradually move up in drill bit sizes till you make that hole perfectly clean. After that you will want to reinstall the EGR pipe (clean all of the stuff from it also), remove the EGR valve itself and get some Honda Top Engine cleaner and pour the whole can down the EGR valve hole. Put the valve back on, and go drive the car around a secluded area to get rid of all the white smoke from the tail pipe. The Top Engine cleaned will dislodge any of the carbon that might be still in the intake manifold EGR port and will burn it all off in the engine. At the same time Top Engine cleaner will burn off some of the carbon sitting ontop of your piston tops and clean the intake valves/ports.

Hope this sorta makes sense, unfortunately I do not have any pictures of the EGR port cleaning procedure.

02-26-06, 11:04 PM	#63 (permalink)
BlackBirdVQ Registered User Join Date: Feb 2006 Location: Chicago Posts: 6 Car 1: Too many to list iTrader: (0)	Make sure the timing belt is installed right, all the hoses are hooked up and the EGR port inside the intake manifold is not clogged up. I always take the EGR port plate off the back of the intake manifold and clean all the snot out of the port. Last Legend I did HGs on, had alot of hesitation before the HG job, after I got done with the hesitation was completly eliminated. Acura has a TSB on EGR port clogging which can cause hesitation and drive line vibrations on the MDXs. Similar principle applies to the Legends, but none of them but the 95 models will code for a EGR problem. 95s will code saying the EGR valve is bad, but in reality the port is clogged and it needs to be cleaned. 96-up RL and TLs with the C series motor will code with a P0401 EGR flow insufficient code, I get to fix alot of independent shops misdiagnosis because they always install the valve and never clean the port out- causing the light to come on within 100 miles. Port can be cleaned without taking the intake manifold off, you just need to remove the EGR pipe that runs from the back of the right cylinder head to the intake manifold-remove the black box on the firewall where the MAP sensor sits in to see the pipe better and get at the bolts. Get a small but long drill bit and stick it in the EGR port hole (where the EGR pipe bolts up too) till it pokes a hole in the EGR port hole-there is a hole there that will be all carboned up. You will need to gradually move up in drill bit sizes till you make that hole perfectly clean. After that you will want to reinstall the EGR pipe (clean all of the stuff from it also), remove the EGR valve itself and get some Honda Top Engine cleaner and pour the whole can down the EGR valve hole. Put the valve back on, and go drive the car around a secluded area to get rid of all the white smoke from the tail pipe. The Top Engine cleaned will dislodge any of the carbon that might be still in the intake manifold EGR port and will burn it all off in the engine. At the same time Top Engine cleaner will burn off some of the carbon sitting ontop of your piston tops and clean the intake valves/ports. Hope this sorta makes sense, unfortunately I do not have any pictures of the EGR port cleaning procedure.