93 4.0 code 512 rough running
#1
93 4.0 code 512 rough running
Any help would be much appreciated. Just got the truck and cel is on. Underpowered and surges while driving till throttle is depressed 3/4 or more and it clears up and runs strong. Checking codes manually I got 111and 512. Light went out for a night not sure why or how, but it ran a million times better. Light came back on next day and right back to being sluggish and feeling like its cutting out while driving. Tried clearning codes using the jumper wire, pulling pcm fuse, and disconnecting battery. No luck getting the code to go away
#2
RF Veteran
iTrader: (1)
Welcome to the forum
111 System checks OK
512 Memory power (PCM pin 1) was interrupted or battery disconnected <<<< you did this
so neither would cause engine issues
On the4.0l
Clean the MAF sensor
Unplug TPS(throttle position sensor), this should turn on CEL full time, drive truck to see if it runs better without TPS
Also check codes again to make sure TPS code was set
Ford 3 digit codes found here: https://therangerstation.com/tech_li...gitcodes.shtml
With a 1993 you can read codes using CEL to flash the numbers
111 System checks OK
512 Memory power (PCM pin 1) was interrupted or battery disconnected <<<< you did this
so neither would cause engine issues
On the4.0l
Clean the MAF sensor
Unplug TPS(throttle position sensor), this should turn on CEL full time, drive truck to see if it runs better without TPS
Also check codes again to make sure TPS code was set
Ford 3 digit codes found here: https://therangerstation.com/tech_li...gitcodes.shtml
With a 1993 you can read codes using CEL to flash the numbers
#3
Welcome to the forum
111 System checks OK
512 Memory power (PCM pin 1) was interrupted or battery disconnected <<<< you did this
so neither would cause engine issues
On the4.0l
Clean the MAF sensor
Unplug TPS(throttle position sensor), this should turn on CEL full time, drive truck to see if it runs better without TPS
Also check codes again to make sure TPS code was set
Ford 3 digit codes found here: https://therangerstation.com/tech_li...gitcodes.shtml
With a 1993 you can read codes using CEL to flash the numbers
111 System checks OK
512 Memory power (PCM pin 1) was interrupted or battery disconnected <<<< you did this
so neither would cause engine issues
On the4.0l
Clean the MAF sensor
Unplug TPS(throttle position sensor), this should turn on CEL full time, drive truck to see if it runs better without TPS
Also check codes again to make sure TPS code was set
Ford 3 digit codes found here: https://therangerstation.com/tech_li...gitcodes.shtml
With a 1993 you can read codes using CEL to flash the numbers
#5
RF Veteran
iTrader: (1)
Sensors rarely fail but are often replaced, lol
I think the number is like 50% of DIYers replacements were un-needed, and 20% of pro-mechanic replacements, but I think the later is bill padding
Best practice is to unplug any sensor or control, and plug it back in, most sensors use 5 volts, so a poor connection effects the voltage, simply unplugging and plugging back in cleans the contacts, which is often why installing a new sensor can work, but a waste of money when you just need to clean the contacts
O2 sensors do run out of chemicals, like batteries, so should be replaced every 100k miles or so
TPS needs to be replaced with a Motorcraft or Hitachi brand, other brands won't work well on Fords
There is no sensor for "power", so can't answer that question
Computer calculates air:fuel mix for best power based on RPM, MAF sensor, TPS, and O2 sensor
I think the number is like 50% of DIYers replacements were un-needed, and 20% of pro-mechanic replacements, but I think the later is bill padding
Best practice is to unplug any sensor or control, and plug it back in, most sensors use 5 volts, so a poor connection effects the voltage, simply unplugging and plugging back in cleans the contacts, which is often why installing a new sensor can work, but a waste of money when you just need to clean the contacts
O2 sensors do run out of chemicals, like batteries, so should be replaced every 100k miles or so
TPS needs to be replaced with a Motorcraft or Hitachi brand, other brands won't work well on Fords
There is no sensor for "power", so can't answer that question
Computer calculates air:fuel mix for best power based on RPM, MAF sensor, TPS, and O2 sensor
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