Rough Idle
#1
Rough Idle
My 94 4.0 Ranger starts fine and begins to idle aroung 1700-2000 then after awhile will drop to about a 1000 and run very rough and sometimes stall. A little touch to the accelerator fixes this for a few seconds and then it continues to run horribly at rest. Where do start with this idle issue? Also I found a bolt in my driveway yesterday and am not sure if it can be identified as a ranger bolt or other. It is about 1 1/2" and has a I over 109 on the head. Any ideas? I hear no new noises or running issues as of yet.
Thanks for any help.
Thanks for any help.
#3
#5
Clean your IAC to start with. I don't know if these have that coating in them so try to get a cleaner that won't strip it off.
Clean your MAF while you are at it. When you take off the MAF turn on your headlights and unhook the negative battery cable. While you are cleaning the MAF the ECU will reset and when you hook everything back up the computer will relearn it's idle. It's a start anyway.
Clean your MAF while you are at it. When you take off the MAF turn on your headlights and unhook the negative battery cable. While you are cleaning the MAF the ECU will reset and when you hook everything back up the computer will relearn it's idle. It's a start anyway.
#8
it drains the stored power in the system that is usually used to keep the ECU memory in case of pulling the battery. Draining that power sends the ECU into a relearn mode that will make it kind of start from scratch when you put in a new clean MAF or other item like that. No sense in using the old values from a dirty MAF it it's no longer dirty right?
Clean the MAF with electrical contact cleaner. If you search it, you should find a good brand. As far as the IAC, I think there are certain brands of carb cleaner that are safe for use with a coated IAC or throttle body. I don't know if it is a Ranger problem, but I know some Mustangs of the era have a coating on the inside of the throttle bodies and IACs that can be removed with a standard carb cleaner. That's bad.
Clean the MAF with electrical contact cleaner. If you search it, you should find a good brand. As far as the IAC, I think there are certain brands of carb cleaner that are safe for use with a coated IAC or throttle body. I don't know if it is a Ranger problem, but I know some Mustangs of the era have a coating on the inside of the throttle bodies and IACs that can be removed with a standard carb cleaner. That's bad.
#10
#11
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