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Old Feb 15, 2008 | 11:11 AM
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The problem was when I start my truck up in the cold mornings, it starts fine and runs at a decent idle (low but idles) when I put into gear (auto drive) the rpm's shoot up, a few hundred rpms, any how I drive it around till warm and go to put it into park it dies, so I replaced the IAC (idle air control) but it still does the same thing, so what next would be in line to check/replace? I have a 89' f250 with a EFI 460 and an unadjustable timing system (so im told it does it automatically by the readings and comp).
 
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Old Feb 15, 2008 | 11:17 AM
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when was last tune up?

codes?

did you reset computer after replacing iac?
 
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Old Feb 15, 2008 | 12:42 PM
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This all started happening after I did the tune up (including a new O2 sensor) and no did'nt disconnect the battery after installing the IAC (was I supose to?) Will try it and see what happens. So any other ideas if that does'nt do the trick?
 
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Old Feb 15, 2008 | 12:49 PM
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check codes first.

what kind of plugs?

you can check the base timing by removing the spout.
 

Last edited by quicklook2; Feb 15, 2008 at 12:53 PM.
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Old Feb 15, 2008 | 01:09 PM
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i hav'nt checked codes, but will attemp to, now the spout connecter is that the plug that is attached to the module ??? on the distrubitor?
 
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Old Feb 15, 2008 | 01:18 PM
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not sure on every year/engine, do an advanced search in this forum.

what plugs are you using? plats?
 
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Old Feb 15, 2008 | 01:23 PM
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the plugs are autolite platnium al ## something there the right ones
 
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Old Feb 15, 2008 | 01:36 PM
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plats and these engines do not play nice.

use motorcraft copper plugs.

i bet your plugs are fouled and are the source of the problem.

does not take much for that little ity bitty tip to mess up.
 
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Old Feb 15, 2008 | 02:46 PM
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I will check that out too,
Whats your take on the Throttle Position Sensor (TBS)?could that be a problem causer.
 
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Old Feb 15, 2008 | 03:45 PM
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6 pack of beer says it's the plat plugs.
 
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Old Feb 15, 2008 | 05:27 PM
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I thought motorcraft and autolite were the same thing. I have always ran motorcraft or autolite platinum plugs in my truck. Its got 250K miles on it and I've probably put in new plugs about 4 times. The very first time I changed them, I put in the regular motorcraft plugs. It ran fine, but they didn't last but about 15-20 K miles. I don't want to have to fool with them that often. I've never had a single problem and they last longer than the regular plugs. I have heard though that alot of people prefer the regular motorcraft plugs. Stay the hell away from all the types of Bosch plugs though.
 

Last edited by TexasGuy001; Feb 15, 2008 at 05:30 PM.
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Old Feb 15, 2008 | 06:51 PM
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plats. they work for some.

if a problem though it is the first thing i would look at.
 
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Old Feb 16, 2008 | 06:05 AM
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My bad, I have got to remember when replaceing parts that have a plug on them, that I have to DISCONNECT THE BATTERY and reset the computer, once I did that and drove it around, enough time for the computer to recaliprate the system. Thanks ya'll
for your input, it's working like it should now.
 
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Old Feb 16, 2008 | 07:00 AM
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I got a bad MAF from Autozone once, maybe you got a bad IAC?
 
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Old Feb 16, 2008 | 08:27 AM
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Naw the IAC is okay, I just did'nt disconnect the battery to reset the computer.
 
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