Really... you are dead wrong, no matter what sort of spin you put on it.

A 94 and later PCM does not suddenly switch to "speed-density" on cold start. It doesn't have to.... it has the MAF to tell it what the mass air flow is into the engine. It does not have to default to a system that uses an equation involving the perfect gas law, inlet absolute temps and pressures, volumetric efficiency tables and rpm.

 

hmmmmm
I thought it disregards all that , until engine comes to 160 and up TEMP ?????
CRAP I guess I am WRONG

 

I think you have your terminology wrong. Speed density is a calculation done by the PCM based on VE, engine displacement, IAT, barometric pressure, MAP and RPM. It actually calculates how much air it thinks is entering the engine and then determines how much fuel to inject with that air. MAF systems simply measure the amount of air entering the engine and the PCM uses that info. to determine how much fuel to inject. Whether it's calculated or measured the major job of the PCM is to deliver the right amount of fuel to the incoming charge. The MAF will always be used unless there's a complete failure, in which case the PCM *can* switch to speed density. It doesn't matter if the engine's hot or cold, the MAF will always measure the air flowing through it.

What you are thinking of is fuel corrections. The car runs open loop when cold (as opposed to closed loop, ie correcting fuel delivery based on O2 sensor feedback) When in closed loop the PCM aims for an AFR of 14.7, and maintains that AFR by monitoring the O2 sensors. In open loop it aims for richer AFR, depending on temp and load. There is a seperate table in the PCM that contains this information. By the time data reaches this point in the PCM's process though it doesn't matter if the airflow information came from speed density calculations or was measured by the MAF, it's just a number representing the amount of air entering the cylinders.

 

Here is the answer... No.

You don't need it. Mine was disconnected years ago, and the EGR was plated off. These two items are not necessary for proper operation. I did need to have the SES lights de-programmed, but the car runs just fine.

 

Yea
You are right, I had stuff little mixed UP
thanks

 

Hey tnthub and others who removed it. Aside from the caps and the aluminum tube.. what other stuff will I need to remove it? Do I need to make block off plates or something? Anyone got any photos of what all gotta be removed?????? Or can gimme a list. I'd appreciate it.

thanks

 

It pulls the air from inlet (Before elbow) Blown on header or mainfold. Just block those! Plumbing stop nut will do it!

 

 

 

Are cars are exempt from mcold start emission testing or something like that. Read the labels by the raditior.

 

What it actualy says on the label is "...exempt from cold temperature carbon monoxide standards."