Rough idle fixes.

[90ltd]

Here is the article about 5.0 rough idle fixes: http://www.autotraderclassics.com/ca...e-190641.xhtml

[sly]

I've experienced most of those.

[gadget73]

bit silly that they chuck out the fuel pump as a possible problem before mentioning the filter. Maybe I just work differently though, preferring cheap and simple fixes to annoying expensive ones. Swapping a fuel filter is considerably less bother than dropping the tank to do a pump job.

[sly]

bit silly that they chuck out the fuel pump as a possible problem before mentioning the filter. Maybe I just work differently though, preferring cheap and simple fixes to annoying expensive ones. Swapping a fuel filter is considerably less bother than dropping the tank to do a pump job.

you're not the only one.

[beco2326]

simular problem

you're not the only one.

im having kinda the same thing going on. the idel goes up an down in park with no load. and now after about a week of that. it hesitates at light pressure on the gas and the check light comes on. if i give it full gas it fine. sometimes i can go a day without it doing it . but sometimes ill start it in the am and it will raise the idle and it will come doun and stal . start again , wavy... i just cant pin point it

[sly]

check the usual suspects, throttle body carbon buildup, idle air control buildup, EGR function. the first two typically just require cleaning. The last one may require parts if that's the case.

[beco2326]

did plugs and wires. but i kinda new that was going to happen. am i right by thinking the IAC is the cylinder looking unit on the back side of the intake and the egr is the bigger unit on the front of the intake? if so i took the IAC off and cleaned it out, wasn't to to bad. and the pin seemed to move well up and down inside. not sure were to start with the egr or what i should use to clean it. i have noticed that in park when it starts to act up , the light goes on and the engine will race, then cut down to almost stall. i drove 20 miles with nothing happening on the high way , i got to get of... back again. thank you for the help

[sly]

yeah, you're right about the IAC and EGR. also inside the throttle body where the "flapper" is, with the engine off, look into it and open it all the way. if there's nothing but black behind the valve, probably should clean that as well. I would also read the codes that are stored in the engine computer since you're saying the light comes on. It should give a clue as to where the real problem is. Sounds like some sensor or connection is screwing up.

[beco2326]

its gotta be something like that. i'm having some trouble tring to get the codes. what would be the best way to go about it. i saw there is some old scanner that may work with my car at auto zone. but i really dont have the 50 bucks for it..... thanks again sly you have helped me alot

[sly]

count blinks of the check engine light or use a test light/multimeter at the plug as shown... http://www.troublecodes.net/ford/

[beco2326]

ok update. i got a scanner coder reader . this thing is really confusing..... if i have gotten it right im getting code 34.44.and 77. it seems like the problem is getting much worse. although it doesn.t seem to miss as much . it feels like its rumbling as i drive under load..( from the motor) at some points it get stuck racing so i go under the hood and unplag the IAC and the idle drops to normal . i plug it in jumps back up. i turn it off then back on . its fine. if i unplug the vacuum to the egr and plug it . it does nothing... when it seems to run fine. i unplug the IAC and it stalls. Im so stuck at where to go. i just cant throw money at it. IAC EGR TPS all like 100 dollar parts i cant aford. any help would be great . thank you

[P72Crazy]

Code 34 and 44 could be related and an indicator that something is blocking the exhaust. Code 77 looks like a test fault caused by improper input during the test. Just like a knock sensor code will display if you don't tap on the manifold rapidly while doing the test. The computer is looking for a "signal" , if no signal, it complains referring to code 77 that is.
Is your smog pump hooked up? Check EGR passages for carbon build up as well as EGR operation. I have seen used cars with air passages blocked with carbon and the seller puts the pollution control stuff back on when he sells the car. Not making a judgment, just trying to point to places where carbon can be a problem. You indicated a "rumbling noise" on a highway drive, sounds like an exhaust issue to me...also check for collapsed muffler (inside comes loose and clogs the outlet). Also, check the cat/cats.

[porschpow]

Sorry to bum off on this thread, but how exactly would one clean the EGR, IAC., TPS?

[sly]

the TPS: just change it. The IAC, carb/throttle body cleaner (unless you have a plastic intake... then you'll have to remove the items first before hosing them out). EGR: remove and use carb/throttle body cleaner on the ports that pass the exhaust gasses.

[porschpow]

Thanks!!