rough idle and loss of poewr
11-18-2007, 10:56 AM
#1
Junior Member
Thread Starter
Join Date: Nov 2007
Posts: 5
Likes: 0
Received 0 Likes
on
0 Posts
rough idle and loss of poewr
Hello everyone, I have a 92 f250 with a 4.9 auto. its been serviced and I changed the fuel filter twice, but its very hard to start and when it dose it idles very rough then after it reaches operation temperature it levels out only to be very sluggish and sputters when in drive. any ideas on what the cause may be.
11-18-2007, 03:09 PM
#3
Senior Member
Welcome!
Standard question - have you had the computer codes pulled? This tends to eliminate a lot of guesswork.
What kind of shape are your ignition components in? Plugs, wires, rotor, cap, coil?
Suggest to inspect the Idle Air Control valve and intake throttle body butterfly. These tend to crud up, causing idling problems.
With the truck running, consider putting a gauge on the fuel rail to check pressure. IIRC, should be in the 25-40psi range.
Is this problem only at idle speeds, or across the RPM band?
Standard question - have you had the computer codes pulled? This tends to eliminate a lot of guesswork.
What kind of shape are your ignition components in? Plugs, wires, rotor, cap, coil?
Suggest to inspect the Idle Air Control valve and intake throttle body butterfly. These tend to crud up, causing idling problems.
With the truck running, consider putting a gauge on the fuel rail to check pressure. IIRC, should be in the 25-40psi range.
Is this problem only at idle speeds, or across the RPM band?
