Question about 1998 Nissan Frontier

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Check engine light comes on it says its the egr not flowing right then I can clear it out and it usally runs about 200 miles before the check engine light comes on. help me?

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Check for

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

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Yes the egr systems get carbon build up in them which restrics flow and then tripps the light. you can replace the egr and then you have to clean the rest of the system out like the egr tube ect sometimes part of the intake system. get a print out of egr system for yours and go from there you can try to clean the egr its self but it is best to just replace. you can most of the time test them with a hand held vacuum pump to make sure its open and closing. it the egr system gets to clogged it can cause serious drivability issues. just make sure the engine is cold before you touch the egr system.

Posted on Jun 04, 2009


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