2000 Expedition 4.6

[Billme]

Got the bypass done.. I decided to use 5/8’s 90 deg hose coupling, to keep kinking minimum..
On my idle problem, on cold starts it’s normal for a minute, then it will increase from a normal 1000 to 1300, then on to 1500…. It all started when I changed to a newer EGR solenoid.. .. I just put a new DP signal box in and throttle position sensor..At least have a good signal from positioning sensor..
Going to check voltage at the connection on the solenoid in the morning.. I’m expecting open coil on this, since it started this behavior since installation.. I try to buy ford parts when Rock Auto has them, within reason..
I also rechecked my fuel rail pressure.. It 27 pounds with engine running..About 33 pounds engine off key on..
Something I noticed was the fuel pressure follows the rpm when this strange cycle happens…

 

[Billme]

The PCM is not even trying to open EGR control.. I noticed it’s dependent on O2 sensor, which is not working…
I’m also afraid my fix on the lower intake has broke loose on the bank 2 side going by the long term fuel figures..
If I have to do a redo, I’ll go with a whole new intake
Manoman

 

[Billme]

Well I’m confident it’s not a air leak on the engine.. I put a new throttle sensor and now have a reading that moves..
This problem is probably on the evap system on the fuel tank..I’m going to have to let my local guy look, when and if he ever gets caught up..
This thing cranks up normal, goes to 1200, and soon 1000rpm, then you hear a solenoid click, then it jump to 1500, then to 1100.. it’s perfectly timed intervals, and will gradually lower in rpm’s.. It eventually lands at 750 where it’s supposed to be..
The engine runs perfectly fine and smooth otherwise..
I’m not getting and engine light.. I did get a P1504.. changed out the solenoid, but it still does this ritual.. I did replace the vent valve, and while just after it started I open the gas tank cap, and it had a pretty good vacuum on it, indicating the vent valve was closed during the cycle..
Do you see anything out of whack?

 

[Billme]

I ordered a Ancel smoke leak machine…..
If I do find a vac leak on the lower intake, does the Dorman lower intake fit what I have, or will I need to buy the whole Enchilada?

 

[Billme]

Ok, look at this, and tell what you think is going on..

September 21, 2024

youtu.be

 

[Hamfisted]

Is that your AC clutch relay you hear clicking ? Is this video made with your AC on ? Seems like an intake air leak of some type. The smoke test will give you a better idea. This issue is a new one right ? It idled ok when you took it on your road trip earlier? But it's some air leak that the idle air control valve can't compete with. I'm surprised you haven't gotten any lean codes already.







.

 

[Billme]

I’ve done it with the ac on and off, and I still hear the click..
Not one time have I got a lean code.. I’m off and on about vac leak..Fuel trims follow this ritual, indicating it’s a timed event, like the IAC is over compensating for the EGR opening..Even the new egr solenoid seems to not allow much opening.. I put a hand vac pump on the egr, and it disturbs the idle like I would think..
If you look at the short video, it’s normal.. I would think if there was a leak, it would do it all the time..
I did notice my intake air temp can’t be right, so I’ll change that.. It seems to stick around 108 degs, even when it’s 78 degs OSAT..
I’m just going to wait for that Ancel, and go from there.. If no leaks, I’ll change the Map, and intake temp since this is a learning experience for me..
Hehe, oh well

 

[Billme]

BTW, I have sprayed starter fluid everywhere I can, nothing effects that I could tell..
I’ve isolated the evap system, brake booster, individual hoses…..I’ll get it eventually I hope