rough idle?
#1
rough idle?
Howdy, Im new here
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.
Thanks.
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.
Thanks.
#2
rough idle...
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.
Thanks...Scott
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.
Thanks...Scott
Last edited by Rotties150; 10-01-2003 at 12:02 AM.
#3
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).
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).
#5
If it only happens once in a while at red lights it is prolly your IAC (Idle air control) they are well known to get stuck when they get old.
or:
new plugs
clean out throttle body (DO NOT USE CARB CLEANER!!! Use INTAKE cleaner)
clean MAF
run techron or Bg-44k through tank
replace fuel filter
lube throttle linkage
reset PCM
the 5.4 is famous for a slightly off/rough idle almost like a slight miss (which it isn't a miss) what you are describing is different.
good luck-
or:
new plugs
clean out throttle body (DO NOT USE CARB CLEANER!!! Use INTAKE cleaner)
clean MAF
run techron or Bg-44k through tank
replace fuel filter
lube throttle linkage
reset PCM
the 5.4 is famous for a slightly off/rough idle almost like a slight miss (which it isn't a miss) what you are describing is different.
good luck-
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#9
The truck is stock.
If the engine light stops coming on, is it possible that the problem is still occuring?
hcmq:
I'll see what I can do, my knowledge of engines and whatnot is pretty limited, but my dad may be able to help me out.
Thanks for the suggestions, Ill see what I can do.
Maybe this is just the "famous" rough idle, and Im just exaggerating/paranoid? Is there really any way to tell the difference?
Thanks guys.
If the engine light stops coming on, is it possible that the problem is still occuring?
hcmq:
I'll see what I can do, my knowledge of engines and whatnot is pretty limited, but my dad may be able to help me out.
Thanks for the suggestions, Ill see what I can do.
Maybe this is just the "famous" rough idle, and Im just exaggerating/paranoid? Is there really any way to tell the difference?
Thanks guys.
#10
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
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#13
Johngs,how is your coolant level? Go check out this website;
www.leakingfords.com
Johngs,after I posted this I realized you had the 5.4 engine.This website is for 4.2V6 engines.
www.leakingfords.com
Johngs,after I posted this I realized you had the 5.4 engine.This website is for 4.2V6 engines.
Last edited by BlueOvalFitter; 10-02-2003 at 06:12 AM.
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