SPONSORED LINKS

Adjusting RPMs/1998 Ford F-150/ 4.2/ 131,000 mi

Tiny
HUTCH4
  • MEMBER
  • 1998 FORD F-150
I've just installed a tachometer in my 1998 F-150, it's a 4.2 l v6 five speed standard and I found that the rpms at idle are around 1500 rpm. How can I bring the rpms down and at what rpms should it be? Thank you very much. Hutch.
Tuesday, August 22nd, 2006 AT 5:19 PM

1 Reply

Tiny
MIKEYBDMAN
  • MECHANIC
  • 623 POSTS
Should be 680-830 when warm. The idle speed is not adjustable.
Things that can cause high idle. Vacuum leaks, throttle plate and linkage, speed control linkage binding, intake air tube leaks, intake manifold, and itmes attached for leaks, such as EGR, and IAC.
If not leaks, I would suspect a bad IAC valve.
SPONSORED LINKS
Was this
answer
helpful?
Yes
No
+1
Tuesday, August 22nd, 2006 AT 5:41 PM

Please login or register to post a reply.

Related Engine Revs Up Content

Idle Air Control Motor Replacement
GUIDE
Idle Air Control Motor Replacement
The idle air control motor or idle speed control motor is designed to adjust the air flow into the intake manifold at engine idle. Engine idle speed is monitored by the PCM...
VIEW MORE

Sponsored links