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I recently had to do and engine swap on a 92 f150 inline 4x4 M5OD at 153000 had so much blow it was quart for every 20 miles (i bought 5 30 weight and it cost me bad). Im no mechanic, but i was able to swap the engine with another straight six. This one was an 89 engine that i was told came out of another 92 f150. I have 6 months and unlimited miles.
Whats going on is that i have to have it at at least 1200 rpm or itll stall and about die on me at a stop. But man on the highway, it runs good.
Ive changed out the TPS, throttle body and gasket, egr valve sensor, new ignition coil, good knock sensor, distributor and rotor are good but i might just change it out too, but i still have rough idle. When i went to change out the fuel injector wiring, there was a transistor looking plug right next to the fuel pressure regulator at the fuel rail. Instead conecting to the sensor between the throttle body vacuum lines and the canistor (i dont know the name of the part, but when it plugs in it ticks sometimes, and the vac lines run though a union from the throttle body to the carbon canistor).
Anyhow, the 92 wiring was different so i had to install my original distributor to the new motor so the wiring and harness could all match. Like i mentioned, the only difference was that one connection right before the #6 injector plugged in to this transistor looking thing that says Stemco 881 61B F170 431_5040. The round cut is where it was sitting in fuel rail with a clip, right next to the fuel regulator.
I read up on how a restirctor plate could help with the rough idle, but when i ran my truck today with the green vac hose unplugged and capped, it idled worse. I plugged it back in and still had a rough idle but didnt die. O did forget to disconnect the battery before running it unplugged so ill try again, Lord willing, tomorrow.
Hopefully someone can help me out with this. Be Blessed ya'll.
I don't know what that is but being you have EFI pull codes to see what is going on.
Dave ----
yes sir Mr. Dave i forgot to list it was a 126 MAP code. I had a brand new one on there and it turned out bad. NAPA brand, had never happened before. I put my old one one there after tapping the case some, and the CEL went away, also the codes. Its running good now. I was stumped cause like i said i put a new one on there and the code would not go away. Checked ground and juice both were good. I couldnt check the hertz cause i had only money enough to make sure it had ground and power lol. Guess it was the hertz portion that was out. Thank you sir.
i still would like to know what this is. Kept saying transistor, but i was thinking capacitor or resistor. It sat on the fuel rail right next to the fuel regulator and plugged in the the same harness as the injectors. It made it look like it was powering the regulator. Made me laugh after i though of what i was gonna have to do and then not needing to after all. Haha.
Sorry for getting back so late.
You found out why new part(s) don't = good LOL
Sorry to say it is happening more & more now days.
On the Stemco part and seeing the bracket and you saying it was on the fuel rail I wonder if it is a temp probe?
It would measure the fuel rail / fuel temp and the computer would make a change.
This is a WAG at best as I don't know.
If the motor runs good and no codes I would not worry about it be keep it on hand just in case deal.
Dave ----
I recently had to do and engine swap on a 92 f150 inline 4x4 M5OD at 153000 had so much blow it was quart for every 20 miles (i bought 5 30 weight and it cost me bad). Im no mechanic, but i was able to swap the engine with another straight six. This one was an 89 engine that i was told came out of another 92 f150. I have 6 months and unlimited miles.
Whats going on is that i have to have it at at least 1200 rpm or itll stall and about die on me at a stop. But man on the highway, it runs good.
Ive changed out the TPS, throttle body and gasket, egr valve sensor, new ignition coil, good knock sensor, distributor and rotor are good but i might just change it out too, but i still have rough idle. When i went to change out the fuel injector wiring, there was a transistor looking plug right next to the fuel pressure regulator at the fuel rail. Instead conecting to the sensor between the throttle body vacuum lines and the canistor (i dont know the name of the part, but when it plugs in it ticks sometimes, and the vac lines run though a union from the throttle body to the carbon canistor).
Anyhow, the 92 wiring was different so i had to install my original distributor to the new motor so the wiring and harness could all match. Like i mentioned, the only difference was that one connection right before the #6 injector plugged in to this transistor looking thing that says Stemco 881 61B F170 431_5040. The round cut is where it was sitting in fuel rail with a clip, right next to the fuel regulator.
I read up on how a restirctor plate could help with the rough idle, but when i ran my truck today with the green vac hose unplugged and capped, it idled worse. I plugged it back in and still had a rough idle but didnt die. O did forget to disconnect the battery before running it unplugged so ill try again, Lord willing, tomorrow.
Hopefully someone can help me out with this. Be Blessed ya'll.
The part shown in the image is a radio noise suppressor (also referred to as a capacitor or resistor) specifically for Ford 4.9L inline-six engines.
Part Details
Identification: It is often described as a transistor-like component that sits on the fuel rail next to the fuel pressure regulator.
Markings: The face is engraved with STEMCO, and identifying numbers including 881 61B, F170, and 431-5040.
Function: Its primary purpose is to reduce electrical interference (radio noise) generated by the fuel injectors that could affect the vehicle's radio or other electronic systems.
It is typically connected to the same wiring harness as the fuel injectors, often located near the #6 injector.
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