Unfortunately not. Although the seal I made did seem to improve the trim readings just a tad bit this morning (seem to give about 1-2% more throttle room before maxing out the LTFT) but might just be the rainy weather. Still have that high pitch whistle between 30-45% throttle. Any way to apply about 5.5lbs/min of vacuum without having the truck running?

 

Could be many things, you have to check all lines, grommets, seals, etc until you fid it.

 

Well, I think I just pulled and eliminated about everything I could from the intake...

1. EVAP not connected, Port plugged
2. IAC line pulled off and vacuum tested to 20+ in hg - reinstalled
3. brake booster checked to 18-19 in hg
4. brake vacuum pulled off and vacuum tested to 20+ in hg - reinstalled
5. PCV line pulled off, plugged port in back(think this was my whistle, don't think my plug job was perfect, won't know for sure till tomorrow short test drive didn't make any difference in LTFT behaviour)
6. breather line on other side pulled off and vacuum tested to 20+ in hg - reinstalled
7. sealed maf mounting plate to maf housing - reinstalled
8. EGR vacuum line removed
9. listened with a stethoscope at idle to all lines (no noises said "here I am"
10. checked my bolt tightness on intake gasket job
11. main vacuum line pulled off and tested to 20+ in hg - reinstalled
12. fuel pressure regulator line pulled off and tested to 20+ in hg - reinstalled
13. main vacuum line pulled off and tested to 20+ in hg - reinstalled
14. FPR tested to 20+ in hg

did I miss anything as far as vacuum goes? if not, I'm going to have to move on to checking fuel pressure and fuel filter (can't remember if I ever changed it)

I'm about 75% of the way to end of my line and taking it somewhere and saying here you fix it, I give up. the thing runs fine except for trying to accellerate with normal seat of the pants feel. If it only had a problem at hard acceleration I'd probably be a doctor and tell myself not to do that... but when it's something that you have to do, it should be fixed. *wondering how long it would take to kill an engine*

 

[QUOTE=chromegsx;3686146]Well, I think I just pulled and eliminated about everything I could from the intake...

1. EVAP not connected, Port plugged
2. IAC line pulled off and vacuum tested to 20+ in hg - reinstalled
3. brake booster checked to 18-19 in hg
4. brake vacuum pulled off and vacuum tested to 20+ in hg - reinstalled
5. PCV line pulled off, plugged port in back(think this was my whistle, don't think my plug job was perfect, won't know for sure till tomorrow short test drive didn't make any difference in LTFT behaviour)
6. breather line on other side pulled off and vacuum tested to 20+ in hg - reinstalled
7. sealed maf mounting plate to maf housing - reinstalled
8. EGR vacuum line removed
9. listened with a stethoscope at idle to all lines (no noises said "here I am"
10. checked my bolt tightness on intake gasket job
11. main vacuum line pulled off and tested to 20+ in hg - reinstalled
12. fuel pressure regulator line pulled off and tested to 20+ in hg - reinstalled
13. main vacuum line pulled off and tested to 20+ in hg - reinstalled
14. FPR tested to 20+ in hg

Damn man, all that for two positive lean codes? That sucks. Ford has their list on what to look at first tackling the problem. I'd have to look it up, but I know the first two and agree with , but in reverse order lol.

They have MAF before PCV. With these engines, the more common is the PCV system or rear elbow.

What I can't believe is why you waited so long to test the fuel system ? I thought you tested this already? Didn't you? Fuel system diags is #3 - Purdy sure Ford has that there as well.

Ahhh, wait! I see what your doin. Your doing the complete vacuum system check. I might do a visual of the system and look for the obvious, but wouldn't test the vac harness or evap until I ran the fuel diagnostics. You can do this with the old filter first for curiosity reasons, but have a new one on hand to swap it out to run the tests again while you have the tools out.

Those filters do an awesome job and do get very dirty in a short amount of time. I change mine at least every 9000 or third oil change.

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Also, the emissions harness disconnects completely and is tested on the bench.

Also test both reservoirs.

1.- behind the battery.
2.- Under the passenger side fender.

I only disconnect what needs to be, because to reconnect those lines, you have to dip them on lacquer thinner / then attach to the hard-line. This shrinks and seals the connection.

Anyway, a failing filter will eventually lean her out.

Your probably just outside of set parameters - A very long time, but yes, it will shorten the life of

Glad to see you haven't given up on it , you'll find it .

 

just tested the fuel pressure. I'm at 31 psi idle with vac and somewhere around 40 or a little over without vac. I say somewhere cause the the needle was quite bouncy. My haynes says 30-35 with vac and and 40-55. So, I dunno, seems within spec, but seems low at the same time. Wish I had a way to adjust the pressure a bit and make sure it was in the middle range. Didn't get the filter changed yet though, gotta go trout fishin' with the kids first. Will be filter changing this afternoon hopefully... and then I'll retest pressure again.

 

Don't worry about being on the low side of things. They pretty much all test that way. As long as your within spec - your good.


I would install that O-ring on the MAF tower by design if you haven't yet.

 

Well got the fuel filter changed, no change. Still got the CEL. Guess I'll just make an appointment to get the exhaust fixed and hope it magically solves the problem. Any leads on that o-ring, The picture you posted doesn't really say here I am. Is it something I can pick up at the hardware store or will I likely have to go to the dealer? If so is there a part number handy?

 

I'm taking it apart in about an hour, I'll throw a ruler on it or something and take a pic. Yea , I never had to purchase or replace one.

Exhaust fixed up??? Yea, if it's leaking, that will lean it out. For sure - Been there done that.

 

Curious how the exhuast causes lean if the problem is all after the HO2S?

 

It won't after the O2's - But flow and scavanging plays a roll - Air in/ Air out/ What your tuned for.

 

Had these on my phone - Forgot who I took them for. Anyway -





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Yea, on the exhaust, a leak at the manifold/EGR pipe can thro off mixtures. So can an after market air intake. An after market intake pushes you to the lean side of your factory tuned programed parameters, but your usually within Margins and won't generate CEL. Your closer to it,- if you know what I mean. So you have to figure that in. The slightest problem elsewhere within the system can push to the outside of the programmed set.

I'm not sure what intake your running, I'm just saying.

 

Ahhh now I see the ring in your previous photo. I was looking for a ring the size of the maf inlet or air box diameter. :o I didn't have maf appart that far. I'll check that next. No change after the fuel filter change if I didn't already say so. I'm all stock by the way including the intake. I'm thinking about being a bit not stock and getting an adjustable fuel regulator so that I can adjust this dumb light off.

Let's see if I got this right, exhaust leak before the O2.... if I had one which I don't believe I do. Cause I just replaced the one manifold.... wouldn't I show one code or the other, not both, cause each bank has it's own sensors, adjustment, etc.?

A little theory on my way home was running thru my mind today. If I get more fuel pressure when I take the vacuum line off (testing procedure), then wouldn't a vacuum leak increase my fuel pressure and be opposite of the lean code that I'm getting? Or am I missing something that the PCM is doing? Just doesn't follow the limited knowledge that I currently have.

 

Good questions! I can't answer confidently, I would have to read up on it. BUT, your on to something that rings a bell, so to speak. Referencing the PCM/opposite of lean theory. I vaguely recall reading that the system is actually rich! Don't quote me on that, but it was something to that effect that didn't make much sense to me.

If I wanted to find the answer. -

1. Here, I would look-up user Bluegrass and go over what he has posted in the past in some of these lean threads. He has talked about this before. This info is in the "Engine" forum specifically.

2. I would look for answer's @ few sites. Here's a couple -

http://www.fordscorpio.co.uk/fuelmonitor.htm

http://fordfuelinjection.com/

Good Luck!

 

Nice, I'll look into that shortly. Meanwhile I got my MAF pulled to the oring this time. Oring is in great shape IMO. But I have a bit of concern for the maf wires, take a look at the pics and see if anyone notices anything. If you do let me know which pic your looking at.