Ford Repair Questions? Ask a Mechanic for Answers ASAP
Hello and Welcome to Justanswer, My name is XXXXX XXXXX I am here to try and assist your with your question.
do you have any idea what may be wrong
With all that you have replaced and the idle is still flaring, I would suspect you PCM (computer) has lost its ability to control Idle speed thru the IAC. Try unplugging the IAC and then drive it, it should idle a little slow , if so suspect the PCM is bad.
unplug the idle motor
Yes that would be the IAC (idle air control) valve on the throttle body.
what is the pcm (computer) and were is it located
The PCM is the engine control modual and on your 1996 its located in the drivers side firewall in between the brake booster and the inner fender.
how expensive is that?
You can usually buy a reman for about $200.00
is it possibe to be the evr valve or the Coolant Temperature Sensor? thats what a frinend suggest but im not sure
It not very likely .
ok well im gonna go unplug the idel motor and run down the road a min. and i wll be back and let you no more. thanks alot
ok, let me know
ok it idele parked at about 800rpm and changing gears a 300rpm it would drop down to around a 1000rpm so i think that is it can yyou give me more info on the pcm location and what it looks like. thanks agaim
Here is the diagram for loaction.DOWNLOAD HERE
Here is removal INSTRUCTION
will it hurt to drive it wit the iac unplugged
No it sure will not but it may stall on you from time to time.
im still cant place the pcm in the diagram is it like a fuse box with a lot of wires going in the firewall
Look at the second picture, all you are going to see under the hood is the connector and the cover. It right next to the brake booster.
Let me send you a better file.
the second picture is blank
Give me just a sec.
i found it
1 more question
what is the question?
do you no what years f150 will interchange say i get one from the junkyard
You will need to stick with the same year , make and model as well as the same engine and transmission.
so if i found a 1993 with the 302 it wouldnt work
No, not likely you need the same year as your 1996
do you think it could be anything else'
The Wrecking yard may be able to cross it over with there interchang manual but I dont think you can go back that far.The PCM controls the IAC . The TP sensor can cause this but if the new one is working correctely then no not likely.
let me know how it goes.
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ok thanks sure will and ill let you no how it goes with the computer
Your very welcome. Thank you as well.
im looking at computers what the diffrence between pcm and ecm
There is no difference, the PCM is a an ECM. Ford calls them PCM and aftermarket calls them ECM. Same thing.
are they any way of checking the pcm computer. i find one at the junkyard and want to make sure it is good
It should be about 750 to 850 .
will it hurt to plug the computer up and try it befor installing it into the firewall housing.
if u buy a used or new computer will i have to have it programed or anything
my computer # XXXXX now will the one i buy have to have this same number.
thanks for all your help you nailed the problem on the spot. truck runs fine now. thanks alot