Lol. Glad I could help. I just went through all kinds of crap because of vac leak through the throttle body. You might as well disconnect your battery while you're doing all this, because the computer will need to relearn all the new data coming in. You can clean and or replace all that stuff, but the comp will still be operating under the old data, and you won't notice a difference, or it could be worse. Don't worry, there's alot of good people here with good advice. Good luck, Peace, Dave.

 

Damn. I just got back to the computer flyer. Your right its worse I replaced the Air bypass valve and the vacuum lines. Now the second I take my foot off the pedal it dies. By the way the gasket at the throttle body is good here. How do I get the computer to read the new Egr and ABV? the engine sounds great, not a miss but she wont idle to save her life.

 

Hey Rehab, this is a copy of an old post on F150online. This guy was pretty good with the 4.9. His name is PKRWUD, but I don't think he posts here anymore. Hope this helps you, Peace, Dave. Every single time you replace or clean an item that the ECM uses to learn about something (temp sensor, O2 sensor, TPS, etc.), or that it uses to change something (IAC solenoid), you must reset the ECM when you're finished. The reason why is because the parameters the ECM knows for those items will be for the way they used to be, before you cleaned or replaced them. By applying those same parameters to a new or cleaned item, the value will be different (if it's not, why was it replaced?), and the results will usually be as bad or worse than they were before the item(s) were cleaned/replaced.

The best way to reset the ECM is as follows:

1) Disconnect the negative battery cable
2) Turn the headlight switch on (this makes sure all the capacitors are drained)
3) Wait 10 minutes
4) Turn the switch off
5) Reconnect the battery cable

That resets it.

To properly "re-learn" the ECM, you then:

1) Start the engine and let it idle for 1 minute.
2) Turn it off and wait 10 seconds.
3) Restart it, and turn on loads, like the a/c with the fan on high, the high beam headlights, etc, and let it idle for 1 minute.
4) Turn off the loads, then the engine, and wait for 10 seconds.
5) Repeat steps 1-4, except with the idle at about 2000 rpms.
6) Take it for a test drive of about 10 minutes, driving aggresively.

That's it!

 

Sweeeeet. Thank you very much. Im really starting to like this old truck but my shop kid is already laying claim to it. Good kid. Works hard. Maybe I'll give it to him after paint. He drives a little honda something and hates it. He gave up a Sunday to help and he seems real interested. "they dont remember you,just who you left behind."