rough idle
#1
#2
Take a long screw-driver, grasp it by 'blade' and(with the eng. at idle rpms) 'tap' the IAC 'can' with the handle. If the idle 'clears up' then the IAC is dirty/clogged up or worn. I haven't had too much luck cleaning one--the rough idle usually returns--but it's easy to do. Unbolt and unplug it, then spray a good solvent inside it and then shake it--there'e a valve inside that will 'roll' back and forth--clean it out as good as you can. Hook it back up and try the idle again. A new one was about $45 for my 97 4.6L.
Check your throttle plate for burned oil stuck to its edges--3M and others make a solvent that won't hurt the teflon coating in the throttle body.
How 'old' is your fuel filter? Should be replaced every 15 or 30,000(I forget) miles but I kinda doubt this is the culprit.
Dan
Check your throttle plate for burned oil stuck to its edges--3M and others make a solvent that won't hurt the teflon coating in the throttle body.
How 'old' is your fuel filter? Should be replaced every 15 or 30,000(I forget) miles but I kinda doubt this is the culprit.
Dan
#4
#5
Rough idle
your problem may or may not be IAC, my 97 F150 has had a intermited rough idle for one and half years. The dealer can not fix it, I replaced the IAC, EGR and cleaned, poked and did everything I could. Some of these trucks don't like to idle...
For more information check out the F150 Rough Idle Web site
http://home.pacbell.net/donw35/f150
For more information check out the F150 Rough Idle Web site
http://home.pacbell.net/donw35/f150
#6
I haven't had the hood up on my 97 4.6L in a while so I'm not 'sure' but I think it is on the left side of the throttle body. It's a bright metal 'can' about the size of a tomato paste can. Held on by two 10mm bolts and has an electrical connecter on it too--I think.
You might want to look for coolant dripping onto the #4 coil pack too. Some have found one of the heater hose clamps allows coolant to seep out onto the coil and short it out.
Dan
You might want to look for coolant dripping onto the #4 coil pack too. Some have found one of the heater hose clamps allows coolant to seep out onto the coil and short it out.
Dan