93 LT1 EGR code
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Joined: Oct 2011
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From: Dallas Texas
2025 C4 of the Year Finalist - Modified
93 LT1 EGR code
Keeps coming up. A year ago, I replaced the EGR with an AC Delco part. Two months ago, I got the code again. Did more diagnosing.
What I did to diagnose.
1. Run the car at operating temp, pushed on the EGR valve and it stalled. So that to me, tells me the EGR is working fine.
2. Took off the EGR valve, and didn't see heavy carbon build up in the EGR or intake manifold.
3. Made me think the solenoid was the cause.
But I just got the code this morning on the highway. Any ideas?
What I did to diagnose.
1. Run the car at operating temp, pushed on the EGR valve and it stalled. So that to me, tells me the EGR is working fine.
2. Took off the EGR valve, and didn't see heavy carbon build up in the EGR or intake manifold.
3. Made me think the solenoid was the cause.
But I just got the code this morning on the highway. Any ideas?
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Joined: Aug 2002
Posts: 3,842
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From: SANTA CRUZ CA
Read post #2, see if what Cliff Harris had to say back in 2011 can help:
https://www.corvetteforum.com/forums...-still-on.html
https://www.corvetteforum.com/forums...-still-on.html
Last edited by don hall; Sep 3, 2017 at 01:05 PM.
Thread Starter
Race Director
Joined: Oct 2011
Posts: 16,089
Likes: 819
From: Dallas Texas
2025 C4 of the Year Finalist - Modified
Read post #2, see if what Cliff Harris had to say back in 2011 can help:
https://www.corvetteforum.com/forums...-still-on.html
https://www.corvetteforum.com/forums...-still-on.html
Thread Starter
Race Director
Joined: Oct 2011
Posts: 16,089
Likes: 819
From: Dallas Texas
2025 C4 of the Year Finalist - Modified
Car stalls when you push on the EGR with your finger. Wouldn't that mean the valve and passages are good?
No bad wiring, and I do get power from terminal A on the EGR solenoid connector. All vacuum lines good. Did the solenoid go bad on me?
Last time I got the code was like 400 miles ago. I highly doubt a serious amount of carbon build up would have happened in that amount time.
No bad wiring, and I do get power from terminal A on the EGR solenoid connector. All vacuum lines good. Did the solenoid go bad on me?
Last time I got the code was like 400 miles ago. I highly doubt a serious amount of carbon build up would have happened in that amount time.
