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P0400, 96 Legacy GT, 2.5 Automatic
Posted 07 February 2009 - 09:21 PM
A shop had put a new EGR Valve on it before I got it.
I checked all the vacuum lines, and changed the following off another 2.5 manifold I had:
EGR Transducer (round part above and forward of the EGR volve.
I also blew out the lines and checked for leaks.
I drove it about 30 miles with the D-Check (green connector) hooked up and it passed the check.
Three days later (200 miles) , the code is back :>(
What to check next?
PS I sold this car, but want to fix this problem for the new owner. I thought I had it fixed.
Posted 07 February 2009 - 09:30 PM
Posted 07 February 2009 - 09:45 PM
wouldn't an over-rich condition throw an EGR malfunction? I was just thinking that a valve stuck shut would be rich and one stuck open would be lean. So, if something else caused the mixture problem, but it wasn't enough change to trigger P0420...... Just thinking out loud; don't hang me yet!
Posted 07 February 2009 - 10:24 PM
1) Warm the engine, then verify if you can see the EGR valve operate if you rev the engine.
2) With the engine idling, disconnect the vacuum hose at the EGR valve, and apply some vacuum to the valve (just a few inches should be enough) with either a hand pump or even sucking on a length of hose by mouth. The valve should operate, and if the exhaust passages are okay, the idle should significantly falter.
Let us know what happens in each case.
Posted 08 February 2009 - 05:58 AM
Posted 08 February 2009 - 11:52 AM
Follow the vacuum hoses from the solenoid on the passengers side strut tower. one that runs to the engine area will have a small round filter (about the size of a quarter) on it.
replace that filter. $7 from Subaru.
Posted 22 February 2009 - 07:30 AM
The Crank Sensor was also flagged, the PO had the car checked several times and the Mechanics had said it need a crank sensor.
When I pulled it out I found the 2 wires going to the sensor bare right at the back of the plug. I repaired the wiring and its good to go.
Thanks for the assistance!
Posted 23 January 2012 - 08:23 PM
Posted 23 January 2012 - 09:16 PM
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