SPONSORED LINKS

Engine dies out on start up

Tiny
SHANEMJEFFERS
  • MEMBER
  • 1998 FORD EXPEDITION
  • 5.4L
  • V8
  • 2WD
  • AUTOMATIC
  • 220,000 MILES
Hey folks. I have a 1998 Ford Expedition, upon turning the key the engine fires over but immediately dies out. I have replaced the IAC valve to no avail. I have tried spraying gasoline in the throttle body and sure enough it idles. But heres the kicker. When I have the IAC plugged in it immediately dies out, however when I unplug it it will idle for a few minutes (rough) before it dies out. Please help
SPONSORED LINKS
Tuesday, August 12th, 2014 AT 6:34 PM

3 Replies

Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 109,758 POSTS
Have you checked fuel pump pressure? Also, has the check engine light come on?
Was this
answer
helpful?
Yes
No
Tuesday, August 12th, 2014 AT 10:10 PM
Tiny
SHANEMJEFFERS
  • MEMBER
  • 7 POSTS
Fuel pressure was good, and yes the check engine light was on. I did finally get it figured out though, It was a vacuum line on the air intake causing the engine to stall. It showed all the symptoms of the IAC sensor but was as simple as a broken line. Thank you for the response though!
SPONSORED LINKS
Was this
answer
helpful?
Yes
No
Tuesday, August 12th, 2014 AT 10:38 PM
Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 109,758 POSTS
Glad you found it. On this engine, there are a couple behind the throttle body that have 90 degree bends in them. If there is a vacuum leak, usually it is one of them.
Was this
answer
helpful?
Yes
No
Wednesday, August 13th, 2014 AT 4:08 PM

Please login or register to post a reply.

Related Engine Stall While Driving Content

How to Read Codes
VIDEO
How to Read Codes
Instructional repair video
Engine Stalls While Driving
GUIDE
Engine Stalls While Driving
An engine that stalls while driving and then starts back up again, either immediately or after a short time is different from an engine that just wont start or if the...
VIEW MORE

Sponsored links