Idles will not rev past 1,100 RPMs

1997 DODGE RAM
257,098 MILES • 5.2L • V8
Avatar
MOTORCAR222
  • MEMBER
  • 4 POSTS
Did tune up and new IAC and bank 1 sensor 1. Truck starts and idles fine but will not rev up past 1,100 RPMs. Today I tested with vacuum gauge, and it stayed steady at 11. Book says valve timing. It seems to me to be either a vacuum leak or timing. Did a TDC and rotor pointing a #1 on cap.
Mar 16, 2022 at 12:27 PM
Advertisement
Avatar
JACOBANDNICKOLAS
  • ✓Experienced Mechanic
  • 110,240 POSTS
Hi,

The vacuum is low. I would expect it to be around 15 to 18 inches of vacuum at idle. Start by checking for leaks.

Here is a link that explains how to do it. Also, if you find no leaks, let me know if you checked engine compression.

https://www.2carpros.com/articles/how-to-use-an-engine-vacuum-gauge

https://www.2carpros.com/articles/how-to-test-engine-compression

Let me know what you find.

Joe
Mar 17, 2022 at 8:20 AM
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 Free Question
Repair Safety Notice: This information is for general instructional purposes only. Vehicle repair can be dangerous. Verify all information, follow manufacturer service procedures, use proper tools and safety equipment, and consult a qualified repair shop when needed.