P0172 with P0174 after changing COP/Plug for P0301

BRIANGEE said:

No long term trims to report? Their behavior will tell you if you have a vacuum leak.

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Can't see any of my technology that reports long term trims. What Apps or devices would they show on?

Next, I have found a EVAP Smoke Machine. Where do you guys recommend I plum it in to find this crazy problem?

Smoke machine is easiest to pull large hose off vacuum check valve going to brake booster. Brian or one of the others can coach you on fuel trims, theirs many apps you can use on the better scanners, $150.00 on up. If you have a basic code only type, it doesn't have that feature. All the shops have that on their scanners though. The guy at Midas, read mine for me.

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1955moose said:

Smoke machine is easiest to pull large hose off vacuum check valve going to brake booster. Brian or one of the others can coach you on fuel trims, theirs many apps you can use on the better scanners, $150.00 on up. If you have a basic code only type, it doesn't have that feature. All the shops have that on their scanners though. The guy at Midas, read mine for me.

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I have both the original OBDII Big Banana and a more recent BT Dongle OBDII with the Torque App, either of those work?

Transporter said:

I have both the original OBDII Big Banana and a more recent BT Dongle OBDII with the Torque App, either of those work?

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BT dongle and torque app will have fuel trim data. For fuel trims you're looking for LTFT and STFT for both bank 1 and bank 2. Graph or log your fuel trims during idle and acceleration.

Thanks Bain for that info.

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UPDATE:

Found another vacuum leak and replaced that hose. That did not fix the problem. I should have leak tested again after replacing that hose as now after testing again after replacing the last leaking hose, I can see another leak. Need help with this to know what it is and how much should be replaced.

From the front looking at the motor, on the right side below and to the side of the throttle body are several hoses. There is a "T" formed by two short hoses with a longer hose coming from the back of the engine that uses a plastic white "T" to join the hoses. The hose coming off this "T" on the right side of the short side of the "T" goes into a weird fitting that has a small Green tube going into it that comes from the left off of what looks like a hard fitting all of which is just above the "T". The stuff to the top right short side of the "T" is leaking.

Should I just replace the two short sides of the "T" which looks like standard vacuum hose or mess with that small green tube and the weird fitting?

Lastly does anybody know what this is for and what it does?

It is leaking from the backside about where I have the blue on the topside marked. See pic
.

Sounds like your hoses back there are pretty dried out due to age and heat. You might want to consider replacing all involved, or you could be chasing your tail till February. Problem is going to be if Ford or anyone still makes them, you might have to improvise.

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That elbow is another common leak spot. You can go to any Advanced Auto or other auto parts store and peruse their "Help" line of vacuum tube elbow packs and find something that'll work as a replacement. The other end of that line runs through the firewall and supplies the HVAC module with vacuum for it's needs. The green line runs back to the EGR valve.
This is all where a smoke machine earns it's cost. Finding all these little leaks.

Hamfisted said:

That elbow is another common leak spot. You can go to any Advanced Auto or other auto parts store and peruse their "Help" line of vacuum tube elbow packs and find something that'll work as a replacement. The other end of that line runs through the firewall and supplies the HVAC module with vacuum for it's needs. The green line runs back to the EGR valve.
This is all where a smoke machine earns it's cost. Finding all these little leaks.

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Got that right. First one was simple, it looked nasty, collapsed, and had signs of dry rot so I replaced it. After that, so far the Smoke Machine has found two leaks.

Question, what is the best and easiest way to seal off the air cleaner area? With the seal I have now, I have found two leaks but I have some smoke leaking in the air filter area so I wonder if I would find additional leaks if it was sealed better.

Is it an area where a bead of rtv silicone would work?

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