Car gave an E30

1993 CADILLAC DEVILLE
100,000 MILES • 4.9L • V8
Avatar
DEVILLE MAN 93
  • MEMBER
  • 13 POSTS
I have the car listed above Sedan, and the only code I have right now is a E30. I know it means ISC RPM out of range, but responses vary, saying that I need to replace the Idle speed control motor or the Idle air control valve. What should be my first step?

(Please note that my dash doesn't have an RPM counter, only MPH)
Jan 29, 2020 at 7:52 AM
Advertisement
Avatar
KASEKENNY
  • ✓Experienced Mechanic
  • 18,907 POSTS
I attached the flow test that we need to follow to determine if it leads us to another issue or if the ISC Motor, PCM, or something else needs to be replaced.

Unfortunately, we could guess but without following this, it would be just a guess.

Let me know if you have questions but again, the best thing to do is run through this until we reach a different path then we can go down that road.
Image (Click to enlarge)
Attached Media
Jan 29, 2020 at 9:56 AM
🔧 Tools & Auto Repair Parts
Find automotive tools, diagnostic equipment, and replacement parts for your next repair.
Shop on Amazon →
Paid affiliate link. As an Amazon Associate, we earn from qualifying purchases.
Add a reply
Join 2CarPros for free, one of the most advanced car repair communities on the internet. From first-time drivers to seasoned mechanics, everyone is welcome to reply, share details, and get better answers. You can add a temporary image or video first; uploads are limited to 20 MB.

Ask a new question

Frequently Asked Problems for This Vehicle