Question about 1997 Nissan Maxima
Check the EGR air passage tube again.
You may miss some on the first pass.
vacuum leaks on intake manifold,
the air tube between the air filter.
intake manifold vacuum hose.
clean throttle plate with Berryman carburator cleaner
SEE sample picture HERE
Also remove carbon built up behind the EGR valve and the EGR passage tube.
Vacuum leak WILL offset the intended 14.7 to 1 air fuel ratio.
More un-metered air (leaks) will lean out the fuel mixture.
Use small amount of Berryman carb clearer at potential air leak area will help you identify trouble spot.
At idle,just spray and listen for the RPM surge.
The in-rush of carb clearer will increase the RPM on the motor.
Record the problem spot(s) and address it later.
EGR carbon built up require 2+ hours to clean from start to finish.
You will need a new EGR base gasket before your start.
Locate and remove the EGR valve after the vehicle is cool down.
Carefully record the connector and vacuum line (for older vehicle) location by drawing an easily to follow diagram.
Remove the EGR valve.
Inspect the location of the carbon built-up inside the valve and the EGR passage tube.
SOAK these areas with WD-40 spary.
You will need a small screwdriver,cloth hanger and lot of newspaper and time to get this cleaning done right.
RE-SOAK the carbon and let it sit for over-night will also help.
One the last round,pass a shop vacuum of the EGR valve and the passage pipe.
Install the new EGR gasket and connectors.
Allow the vehicle to warm up outdoor to burn up any remaining WD-40.
Take it for a test drive.
Please rate my answer if it's useful to you.
Posted on Dec 19, 2009
Thanks Jay for your interest.
I had one question though, am i supposed to get 4 volts at the egr control solenoid on ignition. is there any otheer way to check the control solenoid? I dont want to replace it and the problem come back again. and is the egr tube the thick tube with a big bolt attached to the egr valve? if yes i checked that and there was no clog. I really appreciate your help.
ps the problem is worse now and it stalls almost at evey traffic light. :(
Posted on Jul 20, 2009
Hello and thank you for using Fixya!
I know you say there is nothing clogged. How ever, it's very common to get a Egr code P0400 when the egr tube is clogged. Remove just the Egr tube, the one with the egr temp sensor. Remove the EGR temp sensor and remove any carbon build up in the pipe. Then make sure the passeges in the intake are clear also.
If you have any more questions on this, please feel free to ask. Thanks Jay!
Posted on Jul 17, 2009
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Posted on Jan 02, 2017
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May 02, 2014 | Mazda Protege Cars & Trucks
ECT Sensor Below Thermostat Regulating Temperature
Check the operation of the thermostat (it may be stuck open).Coolant level is too low, or the coolant mixture is incorrect.ECT sensor signal circuit has a high resistance condition.ECT sensor is damaged or it has failed.Trouble Code: P0401
Insufficient EGR Flow Detected
Base engine problem (e.g., a severely restricted exhaust).EGR vacuum hoses damaged, loose or routed incorrectly.EGR passages or intake passages clogged or restricted.EGR solenoid valve is clogged (carbon), damaged or has failed.TSB 87-65-22 contains a repair procedure for this code.
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