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Idles will not rev past 1,100 RPMs

Tiny
MOTORCAR222
  • MEMBER
  • 1997 DODGE RAM
  • 5.2L
  • V8
  • 257,098 MILES
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.
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Wednesday, March 16th, 2022 AT 7:27 PM

1 Reply

Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 109,885 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
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Thursday, March 17th, 2022 AT 3:20 PM

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