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can you turn off ck eng light after unplugging egr

nakta

By nakta,
in 90-95 WD21 Pathfinders

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Duffman NPORA Old-Timer

Duffman

Posted
Posted

It will run, becouse Ive started mine that way, but if im not mistaken the EGR valve sucks air into the engine, without the line it would just suck anything availible, including dirt, water.....babies. I would at least plug it.

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Precise1 NPORA Old-Timer

Precise1

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EGR=Exhaust Gas Recirculation. Your truck will almost certainly NOT pass smog without it. I highly recommend you have the mechanic purchase and install a new unit. If you don't, for whatever reason, best plug all lines and ports. It shouldn't effect the operation of the motor much at all, just polute...

Oh, I have no idea about the CEL... I guess there must be a sensor. Cut the wires, see if that does it, or try joining them if not. Do at your own risk. :shrug:

 

B

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94 Pathy Gary NPORA Regular

94 Pathy Gary

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There is indeed a sensor. It checks for temperature variance when the EGR circuit is energized. If the sensor detects a rise in temperature (meaning exhaust gas is entering the intake) all is well. If there's no rise in temp (meaning exhaust gas is not entering the intake) the Check Engine light is illuminated.

 

The sensor is located just inside the EGR valve housing (on the intake side)

 

I haven't checked to see what happens if you just ground the sensor lead yet. There are 2 possibilities; 1 - Nothing will happen; or 2: The CE light will come on because there is a (false indication of a) temperature rise when the EGR system is not energized (at idle or full throttle, when warmed up)

 

I should check that out one of these days...

 

Cheers!

 

Gary

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