SPONSORED LINKS

1988 F-250 running rich

Tiny
1988F250
  • MEMBER
  • 1988 FORD F-250
  • V8
  • 4WD
  • AUTOMATIC
  • 100 MILES
I have a 88 f250 4x4 with a fuel injected 5L engine. The truck fires up fine but almOst immediately starts to run rich especially under load or higher rpm, I noticed the idle seems to pulse and the idle will drop down and some times even stall when the truck gets reved uP or put into gear. I have changed my fuel pressure regulator, cleaned my idle air control and bought an o2 sensor delete kit ( trucks got aftermarket pipes with no cats). Any suggestions on what I should change next would be awesome thanks.
SPONSORED LINKS
Tuesday, May 31st, 2011 AT 2:16 AM

1 Reply

Tiny
WRENCHTECH
  • MECHANIC
  • 20,761 POSTS
You may have a bad IAC ( idle air control) but try eliminating any vacuum leaks and cleaning the throttle body first. Remove the intake snorkel, have someone hold the throttle wide open for you and scrub the back side of the throttle plate and surrounding bore with an old tooth brush and some carb cleaner. Be sure to spray some into the small holes next to the throttle plate. That should help stabilize the idle. If it still has a problem, replace the IAC.
SPONSORED LINKS
Was this
answer
helpful?
Yes
No
Tuesday, May 31st, 2011 AT 12:14 PM

Please login or register to post a reply.

Related Engine Rich Content

How to Read Codes
VIDEO
How to Read Codes
Instructional repair video
Engine Running Rich
GUIDE
Engine Running Rich
This guide was created to show you what can cause an automotive engine to have a rich fuel mixture, which may cause black smoke to be released form the exhaust tail pipe as...
VIEW MORE

Sponsored links