1986 ford ranger 2.9L v6 5 speed manual 2wd bad gas milage

[keaten]

NEEDING HELP WITH CODES!!!
KOER
42 "SYS RICH"
13 "R" IDLE SPEED CONTROL MOTOR NOT CONTROLLING IDLE PROPERLY
25 "KNOCK SENSOR NOT TESTED"
KOEO
22 "MAP SENSOR OUT OF SELF TEST RANGE"
--------------------------------------------------
CONTINUOUS MEMORY CODES
122 "THROTTLE POSITION BELOW MINIMUM VOLTAGE"
any help is appreciated, i have replaced o2 sensor, map sensor, iac valve, iat sensor, tfi module, coil, spark plugs, wires. still getting bad gas milage, need pointers and forums to look at

 

[RonD]

Could be a leak in the Fuel Pressure Regulator(FPR)

There are 2 fuel lines coming into the engine bay
IN from Filter/Pump
OUT back to gas tank

FPR has the OUT hose connected.............and a vacuum hose
If the FPR leaks, fuel is sucked into the engine via that vacuum hose, causing Rich running of course but can cause several other codes
So simply check that vacuum hose for gasoline, if found replace FPR, if clean and dry then that's not your problem

 

[keaten]

its a new fpr... no fuel coming out of it.

 

[rusty ol ranger]

Hows the vacuum hose running to the FPR? Any leaks?

And when you say "bad" gas mileage...whats it getting? 19-20 is pretty normal. But some people think "its a tiny V6 it should get 25-30"

 

[RonD]

Then its most likely a computer issue

You can pull out current, or look at the old, spark plug tips to see the Rich running, if its seen on all the spark plugs then its not just one leaking injector
If only one side's spark plugs show Rich running then could be a leaking injector on that side(its batch fire injection)