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-beaker
11-27-2007, 06:11 PM
1990 f250 4.9L inline six efi
So my idle is the shits on my truck it surges like mad somedays and others it will be fine, the check engine light is on when it surges.
Ive noticed that most mornings it will idle good until it gets up to temp and then the check engine light comes on and it starts going bonkers. Any ideas or someone that had a similar problem and fixed it?

Redneck Lincoln
11-27-2007, 07:10 PM
HAD SAME PROBLEM, PROBABLY IDLE SENSOR

fordpower
11-27-2007, 07:17 PM
What he said. Its the Idle control valve. Looks round and one plug on the end... [cheers]

-beaker
11-27-2007, 07:24 PM
ummm that narrows it down, ill take a look tomorrow when im done with putting my cb radio in :D

Deathtrap
11-27-2007, 09:16 PM
Your IAC should be on the side of the throttle body, I think it has 3 wire's, also have you tried pulling codes?

.S.N.A.P.
11-27-2007, 09:31 PM
idle sensor or mass air is plugged.. had probs like that and it screwed my idle up

-beaker
11-27-2007, 09:51 PM
anyway to check these things or just replace and move on to the next till its fixed?

epic3
11-27-2007, 10:36 PM
its not the truck its intermittent atmospheric pressure changes leading to your sensors reading improper afr similar to a vacuum leak at the same time if your door is open or your windows open you will find it slightly more laboursome to breath

-beaker
11-27-2007, 11:27 PM
its not the truck its intermittent atmospheric pressure changes leading to your sensors reading improper afr similar to a vacuum leak at the same time if your door is open or your windows open you will find it slightly more laboursome to breath

:confused0006:

epic3
11-27-2007, 11:38 PM
make sure you have an extra O2 supply befor ya open the window or door when its runnin funny

OldEnuff
11-28-2007, 12:20 AM
are you high Phil ;)

epic3
11-28-2007, 01:58 AM
nope lots of O2 around here

-beaker
11-28-2007, 09:52 PM
shut up phil

epic3
11-28-2007, 10:14 PM
damnit even the newbies are gettin wise to this smiley