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Old 04-27-2019, 04:25 PM
rangergt306 rangergt306 is offline
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Default 93 Ranger 4.0 wont idle

I am working on my sons 93 Ranger 4.0, I am at a loss. Idles fine when mass air meter is unplugged, but dies when plugged in. I have replaced MAF, TPS, ECM, O2 sensors, IAC, cleaned throttle body. Any help would be appreciated. It is not showing any CEL codes except for when it is unplugged.
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Old 04-27-2019, 04:46 PM
msarnovsky70 msarnovsky70 is offline
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Posts: 138
Default Re: 93 Ranger 4.0 wont idle

Found this after a quick Google search.. may help
https://repairpal.com/hard-to-start-...ng-at-idle-755

Sent from my ASUS_P00J using Tapatalk
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Old 04-29-2019, 08:33 PM
rangergt306 rangergt306 is offline
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Default Re: 93 Ranger 4.0 wont idle

I have now replaced coolant temp sensor, still having problem
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Old 04-30-2019, 09:31 AM
RangerNed RangerNed is offline
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Default Re: 93 Ranger 4.0 wont idle

Hey there! Try this. While I did not have an "idling problem", I did have problems with my truck as well. I found (2) problems: the first one was, my crank sensor wires were shorting out (causing an intermittent motor cutting out/restarting thing). After I fixed this, it would still cut out at times. I found a video on YouTube: (https://www.google.com/url?sa=t&rct=...BzjhbU4d5Pi82A)
This video is about repairing the PCM and while this is about a full size truck, the PCM is very similar to what is inside ours. It showed (3) capacitors that had worn out and how to replace them. When I pulled my PCM, the capacitors were shot, just like in the video. I did replace them and the truck has been running fine since. It is not my DD, but fires up and runs just fine. It is possible, since you have replaced the major sensors, that the PCM could be messed up. I hope this helps you out.
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1994 Ford Ranger XLT Extended Cab
2WD Automatic
4.0 V6 OHV

MODS: LED Dashlights, Wired for OHC (don't have the guts to cut the headliner), Lighted Visors, Auto-Dim/Mirror, Auto Headlights, other than that it's pretty much stock
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Old 04-30-2019, 11:31 PM
wpginterceptor wpginterceptor is offline
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Default Re: 93 Ranger 4.0 wont idle

ignition module
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