Engine surging 3.0 manual OBD1

[helpme]

Runs good when cold. As it warms up starts surging. Then at full operating temp, starts sputtering. Changed IAC, rotor, fuel filter, cleaned MAF, cleaned throttle plate. Still need to do plug and wires. There has been an old intermittent issue about once a month. The engine would almost cut off, then back on. Seemed like it did it most often when rounding a corner accelerating in 2nd gear. Was very intermittent. Thanks.

 

[rusty ol ranger]

Pull codes

 

[RonD]

Fuel injected engines have an ECT(engine coolant temp) sensor, 2 wire 5volt, just for computer so it can run engine in Choke mode when its cold and then remove the choke after warm up
Not to be confuse with Temp Sender, 1 wire 12volt, used for dash board temp gauge since the 1940's

If ECT sensor is not showing engine is warming up then its staying in Choke mode, and would cause your symptoms, should set a code if that is happening


Keep your eye on the fuel gauge if engine stumbles when going around a corner
The fuel pump hose can crack inside the tank, not a big deal UNLESS it is exposed to air, like when the gas in that tank sloshes around when turning a corner
It will suck in that air which will cause engine to stumble until air is purged, sent out an injector
So if it only stumbles, say below 1/2 tank, but never above 1/2 tank then that may be the issue

In my 1994 if I am below 1/8 tank it will always stumble on a hard right hand turn uphill, lol, but I think that's because pump pickup itself is being exposed to air
That corner is on my way home every day