SPONSORED LINKS

Engine idle eratic when started cold

Tiny
TSNAKE
  • MEMBER
  • 2000 FORD EXPEDITION
  • 90,000 MILES
No codes, runs great after warmed up
Saturday, December 31st, 2011 AT 5:20 AM

3 Replies

Tiny
RIVERMIKERAT
  • MECHANIC
  • 6,110 POSTS
Check fuel pressure and for vacuum leaks.
SPONSORED LINKS
Was this
answer
helpful?
Yes
No
Saturday, December 31st, 2011 AT 5:39 AM
Tiny
TSNAKE
  • MEMBER
  • 2 POSTS
Thanks will check further but didn't find any leaks before and would think that the fuel pressure would tend to be lower when hot if the pump was starting to fail.
Was this
answer
helpful?
Yes
No
Saturday, December 31st, 2011 AT 6:00 AM
Tiny
RIVERMIKERAT
  • MECHANIC
  • 6,110 POSTS
Resistance in wires is higher when cold and lower when hot. If the internal resistance of the pump has increased, the cold wires can make it worse.
Was this
answer
helpful?
Yes
No
Saturday, December 31st, 2011 AT 7:42 AM

Please login or register to post a reply.

Related Engine Runs Hot Content

VIEW MORE

Sponsored links