Question about 2001 Mazda 626
So I got a Mazda 2001, 626, v6. I can't pass emissions cause my check engine came on for an egr malfunction. I changed it (egr valve). Now When it goes on the computer the test show the valve is not ready. It's been a month and it's still not ready. Now besides that my warm up catalyst bank 1 is coming up on the computer. So now my check engine light comes on and flashes between 40-45mph. (thats were my car start to **** also) So, I was wondering if I change my sensor before the catalst and after, will that solve the problem???
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Posted on Jan 02, 2017
could be a bad o2 sensor, you'd just have to look at the pid data on a scan tool to know for sure. odds are good though its a bad catalytic converter. they all have an 8 year/80,000 mile warranty on them but if its out of warranty they can be quite pricey
Posted on Oct 24, 2009
SOURCE: engine malfunction
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
Sounds like you have low fuel supply or a leak in intake system causing lean codes, check fuek pressure and volume first. Cat converter effeciancy could be caused by the lean codes, purge system sounds like solenoid failure, check for high resistance accross purge vent solenoid.
Posted on Mar 08, 2010
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