Does Unplugging the EGR noid disable EGR function?

Xanth · Post by **Xanth** » Thu Oct 30, 2008 12:26 pm

Like title says, if I unplug the EGR solenoid does that also disable the EGR function in the ecm?

Or will the ecm continue to adjust the timing as if the EGR was actually working?

The Dark Side of Will · Thu Oct 30, 2008 2:24 pm

The ECM will detect that the EGR is non-functional, light the MIL and revert to non-EGR operating parameters.

However, I don't think it looks for a load on the solenoid circuit... it may use IAT or similar to detect EGR operation.

CincinnatiFiero · Post by **CincinnatiFiero** » Thu Oct 30, 2008 9:45 pm

I ran my 88GT with blocked off EGR and plugged the line and never threw a code in the year I drove it like that. So I dunno, my car ran fine.

FUCK I was saving post number 1000. well shit there it is.

Series8217 · Post by **Series8217** » Thu Oct 30, 2008 11:06 pm

The Dark Side of Will wrote:The ECM will detect that the EGR is non-functional, light the MIL and revert to non-EGR operating parameters.

However, I don't think it looks for a load on the solenoid circuit... it may use IAT or similar to detect EGR operation.

IAT is upstream of the EGR so it doesn't use that. I think it monitors the O2 sensor voltage to detect EGR function under specific conditions.

Xanth · Post by **Xanth** » Fri Oct 31, 2008 7:13 am

My EGR has been blocked off for awhile, though I only recently learned that timing is actually adjusted during use which is why I was wondering.

I'll see if just unplugging the solenoid throws a code.

The Dark Side of Will · Fri Oct 31, 2008 8:12 am

Series8217 wrote:
The Dark Side of Will wrote:The ECM will detect that the EGR is non-functional, light the MIL and revert to non-EGR operating parameters.

However, I don't think it looks for a load on the solenoid circuit... it may use IAT or similar to detect EGR operation.
IAT is upstream of the EGR so it doesn't use that. I think it monitors the O2 sensor voltage to detect EGR function under specific conditions.

Tru dat... wasn't thinking about where the sensor is.

Xanth wrote:My EGR has been blocked off for awhile, though I only recently learned that timing is actually adjusted during use which is why I was wondering.

I'll see if just unplugging the solenoid throws a code.

If you'e had it blocked off, it *should* be throwing the EGR code on highway drives. How long since you saw your MIL light? Is it burned out? :thumbleft:

CincinnatiFiero · Post by **CincinnatiFiero** » Fri Oct 31, 2008 10:13 am

That was my thought with my car too but when I'd leave my dome lights on them try to crank my car or if I bogged it hard or something my MIL light would kick on. Driving without the EGR blocked off never threw the MIL.

Xanth · Post by **Xanth** » Fri Oct 31, 2008 6:01 pm

My light works, turns on during the Bulb Test.

The Fiero ECM definitely checks the exhaust for EGR function, or we just believe it does?

The Dark Side of Will · Fri Oct 31, 2008 6:16 pm

I have the EGR on the Storm Trooper blocked and it throws the EGR code.

lucky · Post by **lucky** » Sat Nov 01, 2008 12:41 am

I was getting a code on the highway when the plenum passage was clogged.
Why disconnect it? Just cause you can with the new MA standards?

Xanth · Post by **Xanth** » Sat Nov 01, 2008 8:41 am

lucky80 wrote:I was getting a code on the highway when the plenum passage was clogged.
Why disconnect it? Just cause you can with the new MA standards?

Because I don't want my timing to be advancing, since the EGR isn't actually functioning. I blocked mine off because the Y-Pipe mounting point is all buggered up and can't seal.

Did the Mass standards actually change? Do we not need to pass emissions anymore? I'd heard rumors of that.

lucky · Post by **lucky** » Sat Nov 01, 2008 4:30 pm

According to my friend Joe (who is a licensed MA inspector), as of 10/1/08 there is no longer any emissions testing on OBDI vehicles in MA. I also inquired if he still had to do a visual check for factory emissions components, he said no. Your MIL does still have to be off and not show in the history to pass though.

Xanth · Post by **Xanth** » Sat Nov 01, 2008 4:38 pm

lucky80 wrote:According to my friend Joe (who is a licensed MA inspector), as of 10/1/08 there is no longer any emissions testing on OBDI vehicles in MA. I also inquired if he still had to do a visual check for factory emissions components, he said no. Your MIL does still have to be off and not show in the history to pass though.

That is wonderful news :thumbleft:

lucky · Post by **lucky** » Sun Nov 02, 2008 12:49 am

It is.

CincinnatiFiero · Post by **CincinnatiFiero** » Sun Nov 02, 2008 12:53 am

Start mailing PCMs to darth for the MIL deletes!