Question about Cars & Trucks
2008 hiace engine light keeps coming on and the error code relates to ther EGR air flow. When I pull the main efi fuse (located in front of engine) the engine light comes off and does not come back on and the vehicle still runs well. 1. what could go wrong? 2. How does it work without the fuse?
The sensor can be faulty, test it with VOM see the diagram attached from toyota
God bless you
Posted on Jul 20, 2013
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Posted on Jan 02, 2017
With these computers, anytime your check engine light comes on and than you replace the part, the computer has to be reset with handheld scanner/computer.
So even with a new part, the computer still has to be electronically reset.
Even if there are no codes. You won't have codes because the part is new, but the engine light will remain on until it is reset.
If you have all new parts, no codes, and had the system reset. It could be a problem with the computer itself and will have to be put on a diagnostic computer for further testing.
Posted on May 11, 2009
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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