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1987 - 1996 F150 & Larger F-Series Trucks 1987 - 1996 Ford F-150, F-250, F-350 and larger pickups - including the 1997 heavy-duty F250/F350+ trucks

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  #1  
Old 07-24-2013, 06:07 PM
87diesel 87diesel is offline
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89 460 low idle adjust?

my truck has to be started off in first gear but it's real slow so i try 2nd and with enough throttle it will start but it's usually rough. its got the 460 and zf5 transmission. also when driving at low rpms it will buck like crazy. is it the idle that can be adjusted or should i run fuel injector cleaner through it?
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Old 07-24-2013, 07:12 PM
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There is no idle adjustment. The PCM(computer) controls that function.

How long has this problem been there?

What have you already replaced?

Is the Check Engine Light on?

Have you checked for codes (regardless if you have a CEL on)?
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Old 07-24-2013, 07:55 PM
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You've got something else going on, bad sensor or something. This isn't idle needing adjustment. Pull your codes, that will give a good idea where to start.
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Old 07-24-2013, 07:56 PM
87diesel 87diesel is offline
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nothings been replaced i just deal with it. there is no engine lights or nothing. my friend has a pretty similar truck and it does the same thing. is it the injectors and can i just clean them with an additive or is it something else?
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Old 07-24-2013, 07:57 PM
87diesel 87diesel is offline
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even starting 1st gear it can stall and kill the motor without giing it some gas.
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Old 07-24-2013, 08:00 PM
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What do you mean starting it in gear? You need the clutch in to start, so it's not in gear. Please elaborate
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Old 07-24-2013, 08:09 PM
87diesel 87diesel is offline
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not starting the vehicle, driving off at a stop light starting
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Old 07-24-2013, 08:19 PM
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Quote:
Originally Posted by 87diesel View Post
even starting 1st gear it can stall and kill the motor without giing it some gas.
I have a 300 HP Mustang with a 5-speed manual transmission, I still have to give it some gas to get it rolling from a dead stop.

Perhaps I am misinterpreting your problem statement.
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Old 07-24-2013, 08:37 PM
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the whole issue is while the truck is in motion. the truck seems to like to buck when my foots off the throttle so i rev the engine a little to smooth it out. and say im at a stop sign and then i go to take off it'll want to stall really easy. i don't like using first gear to take off because it's really low gearing and unneccesary to me. so i tend to want to start off in second gear instead off first and it needs a little influence with the throttle so i can do so. not that stalling in second gear is the problem i just thought there is something simple that could be done to help relieve the bucking. maybe i'm just more used to my 6.9 which has a higher idle i just can't understand why it'd be that bad. when started it sounds like the idle is pretty low even to my dad. is it that the injectors could need cleaning or is that how it always is with this engine? sorry for being vague about it.
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Old 07-24-2013, 08:51 PM
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So, you're taking off in second gear and are complaining that you have to give it throttle to start off?
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Old 07-24-2013, 08:55 PM
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no i was talking more about how it bucks so hard at low rpm's
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Old 07-24-2013, 08:56 PM
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just thought it should run smoother at those low rpm's
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Old 07-24-2013, 08:58 PM
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How low of RPMS are we talking? Do you have a tach?
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Old 07-24-2013, 09:08 PM
87diesel 87diesel is offline
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naw i wish i did. the previous owner put a brand new motor in it has 60k now. what's the idle supposed to be on these engines?
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Old 07-24-2013, 09:13 PM
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i figured it sounded in the 400rpm range but couldn't be sure
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Old 07-24-2013, 09:13 PM
 
 
 
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