Will removing the AIR and EGR using block off plates trip the SES? Let's "pretend" I am working 40 hours a week at one job, going to Univ of Missouri in Rolla for another 15 hours, and firefighting in between. (i.e. don't smoke me for posting a totally stupid question that could prolly be researched in about 45 min...I gotta ton of crap to do and just want a quickie)

Oh yeah, its a OBD1 Z28...

Thanks alot!!

 

yes it will. You can get them programed out of the computer by mad wolfe or PCMforless.com

Matt

 

yeah, it will throw codes, but you can have it programmed out of the pcm

 

Code 32 baby.

 

That is not correct. The states the test OBD II cars by plugging into the connector will detect the removal of the EGR. The system knows what should be on the car and it will fail or assume the computer is messed up.

 

Thats not totaly true. I used to do emmisions here in GA and out of 7 items they check you can have two of what they call "not ready" and still pass. If you program out EGR and AIR they will show up as not ready and as long as everything else is running fine then you SHOULD pass. well atleast here in GA. But if you have OBD1 this is all just useless info!

Matt

 

I have OBD1, and don't have to worry about emissions. Still have to do the PCM delete huh??

 

You are correct,as i just had my inspection done with EGR removedfrom pcm and it passed.OBD11 here in NY

 

On the OBD-I cars, there are two codes related to the EGR system. DTC-27 indicates the vacuum solenoid is not working (or missing). You can eliminate the code but putting a resistor similar in size to the ohms measured across the solenoid, into the harness connector.

DTC-32 indicates the PCM did not see the expected change in the MAP reading when it cycled the EGR valve. The OBD-I diagnostic does not seem to be as critical as the OBD-II diagnostic. Where it probably a 99% chance that the OBD-II PCM will set a code for the lack of EGR flow, I'd estimate that only 20% of the OBD-I PCM's will pick it up.

First approach would be to try removing it and see if you get a code. Simply remove the vacuum line from the solenoid to the EGR valve (capping off the solenoid end) and you will have replicated the effects of removnig the EGR system. See if the code sets/SES light comes on. If it doesn't you cn remove the EGR valve, or block the flow.

If it does set the code/SES, you can have the diagnostic programmed out, just like on the OBD-II cars. Or, you can add a circuit that simulates the effects of EGR flow on the MAP sensor. This involves using the signal for the EGR solenoid to insert a resistor in the MAP circuit when EGR is supposed to be flowing. I don't have the details of the circuit, but a "search" should turn up a link to it.

Of course the question I would ask is why delete the EGR system, when it does not hurt performance in any way, it can provide operating benefits under some conditions, and it really doesn't clutter things up much, since most of its hidden behind the intake manifold?