1993C4LT1

Cruising on the highway, I got a SES light. Pulled over, and scanned the codes. Code 32 in module 4, so EGR related. I removed the EGR, to see if it would hold a vacuum and it does. I tested it by putting my finger over the vacuum line hole. It stayed in the same postion, didn't move. Had a bad EGR last year that wouldn't hold a vacuum. Has an AC Delco EGR in it. Nor does anything looked clogged to me. What do you guys think? Also, vacuum line to EGR is fine. So what else should I check?



I had to remove the fuel rail to get to the passenger side bolt on the EGR. Do you guys see the injector where it's missing some kind of o ring? I'm scared to start it, don't want it to leak gas while I drive it. Where do I get one? Or do I have to call FIC, since the injectors are from them?
93 LT1

1993C4LT1

Forgot to mention. I ohmed the EGR solenoid. It came out to 69 ohms. Couldn't find an ohm number for it that would indicate good or bad. Does that number sound bad?

1993C4LT1

Just pushed on the EGR and the car stalled. So that would mean no clogged passages and good working EGR valve right?

bosshog8

From the 90 service manual

1993C4LT1

Thanks. I have the FSM for my 93. I don't have a vacuum pump, so I can't test it like that. But when I push my EGR, the car stalls. So that tells me the EGR is working fine, and no clogged passages. Vacuum lines are fine, all of them. Also, I did follow the chart, wherever it didn't require a vacuum pump. The step where it says to ground the diagnostic terminal, I grounded pins A&G. Then it says to put "test light between harness connector terminals. Put ignition in the ON position. Test light should light, does it?" In my case, it did light up. But the book doesn't specify whether to ground it on the battery positive or negative side. Nor does it say whether to put in terminal A or B on the EGR harness connector. Now, the way I did was like this. Put the test light ground on the negative battery post, and on terminal A of the EGR harness.That way, my test light lid up. Result says, faulty solenoid or faulty connection. Connection looks fine, not dirty at all. So I'm guessing the solenoid is bad. Just wish I was sure.

1993C4LT1

Hey guys, just want to give an update. I put a new EGR solenoid almost 2 months ago. So far, no service engine soon light on my highway drives.