I bought a '97 F-150 5.4L with ~96k miles (up to 99k now) and so far its been great except for one thing.
Sometimes (doesnt seem to be any rhyme or reason to it) it gets pretty rough when idling at a red light. I can feel it shaking pretty good.
Gas is somewhat high around here, so Ive been using 87, and Im wondering if I need to try 89? I suppose I could always try it for 1 tank and see what happens, although it seems like I can go a whole tank sometimes and thie problem wont occur, and sometimes it happens once or twice in one day.
My main concern is this: I had a friend with a '97, 4.2L, and his was idling rough as well. But his would sometimes get rough and then die on him. So far (?) mine has not died on me. He ended up having to get his engine replaced, something I really do not want to have to do.
Any suggestions? If you need more info just ask and Ill answer to the best of my ability.
Welcome to the board. A veritable $h*t-load of great information resides within these web walls.
I've got a '97 4WD 4.6L with a slightly rough idle...certainly nothing to worry about (I think). Your friend had to have the new engine?!?! What went wrong that it required a new engine? I'm curious to know what I should watch for so that I (we) don't have that problem.
Mine idles ~600-700 rpm and the idle doesn't drop, but just feels like it's occasionally missing. Can't remember what the idle was like prior to changing the plugs and wires tho. Just bugs me a little bit...like a rattle. But I'm rather **** retentive, so it bugs me alot.
'97 F150 4.6L 4x4 ORP
K&N FIPK Gen II
Hellwig Rear Antisway Bar
Front Steering Stabilizer
BFG All Terrain T/A ko
OEM Door Cracks (both doors-ooh, lucky me!!)
Infamous "Tranny Shudder" -a.k.a.- factory installed intermittant vibrating seat (now seemingly fixed with "LubeGuard")
SuperChip "Flip-Chip" (Thanks Mike T. and company!)
MSD Coil Packs w/ Ford Racing wires (not that they make me go any faster)
Nakamichi MB-75 Indash 6 CD Changer (now with broken changer...stuck with AM/FM)
Nakamichi PA-1004 Amplifier, 50 watts x 4
Infinity Kappa 5x7s
Electric Fans (Thanks again Troyer Performance)
New Jasper Reman. 4.6L engine (thanks to bad head gasket and sudden engine failure)
Now I'm broke...no more mods for a while
Last edited by Rotties150; 10-01-2003 at 12:02 AM.
On mine, the RPMs dont change any, but the shake is pretty noticeable, I can look in the mirrors and see things shaking and you can feel it pretty well.
My friends truck: he said they took out the oil pan and found metal shavings...I changed my oil just recently but didnt notice anything like that (dont know if I would see problems like that just from removing the oil plug though?)
I forgot to mention, for my truck, when I first bought it the engine light did come for for the first few days, and I took it to AutoZone and the error codes said "right bank running lean" or something to that effect...but the light went away and I havent seen it since (that was ~a month ago).
mine was doing that, and i replaced the iac valve and the rpms stoped dropping below 500 but it still does it but not as noticeable anymore. does the truck have an exaust system? my friend's truck shakes bec they got flowmasters put on their truck
1997 F150 EX-cab lariat 4.6 2wd W/flowmaster and K&N air filter. 190k (sold)
had the same problem you are having with your rough idle in gear at a stoplight but not in neutral or park. i changed everything you could imagine (iac valve, cleaned t/b and maf, pcv valve, fuel cleaner, checked for vaccum leak) and nothing changed. finally i received a code and it was the bank 1 sensor1 the o2 senor just before the cat. convertor on passenger side. changed it and so far so good still a little rough but not nearly as bad as what it was.............................good luck
Mine has had a rough idle since 52k and has 56k now. Its a huntin' rig so gets driven every couple of weeks except when washed. we already put fuel inj. cleaner and changed plugs and wires. Any help please!!
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