I have a 1998 Cadillac Seville STS which has recently developed an intermittent stalling issue. Here are the details:
-Happens occasionally when I’m slowing down or coasting, such as turning into a parking lot or going around a sharp entrance ramp
-Has not yet happened during acceleration
-No bucking or jerking while accelerating
-No apparent warning that it is going to stall
-Has happened once each of my last two trips
The first few times it happened my fuel level was pretty low, and one of the times I tried several times to restart it and it would start but die right away. I managed to get it started again, then I filled the tank and tested the fuel pressure at the rail, and I got 45-50 psi with the key turned but without the engine running.
After that time, I have not had any difficulty restarting it when it stalls. I look forward to hearing your suggestions.
I FIGURED IT OUT!
Last Friday, I found an old post on a forum somewhere about someone having the same issue. They mentioned that they had cleaned the EGR valve, so I figured with two bolts and a connector being all that needs to come off to remove it, I might as well try.
I held the valve in basically the same position that it is installed (meaning I didn’t turn it upside down) and sprayed in the opening with throttle body cleaner (not carb cleaner). I then used a “pipe cleaner” to clean the inside, and I also worked the plunger up and down after I sprayed it.
I had a few “false alarms” in the past thinking it was fixed, so I wanted to wait until I was sure before posting. I now have to lose the habit of constantly glancing at the tach to see if it’s about to stall.
Thank you to everyone who posted here to help me. It would be interesting to know why cleaning the EGR valve fixed it.