2006 acura Tl has rough idle misfire codes.
No overheating issues.

P0404 engine code

Haven’t ever changed the spark plugs have new ones ready.
151 000 km thought i wait until 160k mark with timing belt.

Anti freeze is topped up in fluid container.
Changed it 3 summers ago.

Could it be sensor.
Any help or advice?

Also fan rads keeps running doesn’t turn off or on to recycle. Haven’t seen temperature gauge move.

Thanks.

 

This thread may help - https://acurazine.com/forums/3g-tl-p...-p0404-694497/

 

Thanks i give my EGR a clean, see what happens.

 

If all of those codes are active:

1.) Clear the codes
2.) Drive the car
3.) Check codes

If they are all present again....this is electrical. Too many random unrelated systems complaining at the same time almost always lead back to electrical.

1.) Check your battery voltage with car on and off
2.) Inspect all battery clamps and cables very closely
3.) Check that your ECU isn't wet or stained from water (leads back to clogged drain on the heater core/evaporator)

 

Took off EGR valve found black carbon crumb stuck valve being open. After cleaning with brake cleaner and toothbrush the valve closes and open with needle nose pliers. With multimeter checked resistance of the valve all good middle socket 4.1 kilo ohms far right connector socket 1.9 kilo ohms.
. Added the link below for further information. Didn't have any wire clips to check for power open close the EGR valve piston.

Reinstalled the EGR valve tightened nuts plugged the sensor connector, and started the engine and rough idle disappeared. Smooth engine idle but icheck engine light was on, tried to clear all codes. Using Bluetooth connection to BlueDriver unit was challenging. Losing bluetooth connection when i turned off the engine, to clear check engine light and other codes. After 45 minutes of clearing and restarting over and over again check engine light was finally cleared.

So far car drives well no check engine light.

All i needed to do was clean the EGR clog bit that some have shown on forum pictures of the carbon deposits

Car Engine EGR Valve For Honda Acura Odyssey Accord Pilot Ridgeline TL CL 18011RCAA00 18011-RCA-A00

Saved lot of money looked for OEM EGR valve at acura dealer online asking over $300 US. Other places Ali-express sells one for under $60 not sure of the quality

Part #
18011-RCA-A00