Still major trouble

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Feb 4, 2014 | 11:05 AM

Graham1222

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Still major trouble

No, no signs of running rich on the plugs. And I'm not sure if he checked fuel trims. I know when I called to have him come to autozone with the high dollar scanner I described what was going on and he said clogged cat immediately. Then he got there and did his tests and just told me to have a shop change the plugs because I have 122,234 miles and their probably on the original plugs. Not to do it myself, which I did anyway with no problem luckily. But he did get under and was knocking on the cat to see if he heard anything. And advised me that just because he didn't hear anything doesn't mean that's not the problem. He said get it tuned up and go from there. I'd think this 2000 dollar scanner could point to the exact problem but it didn't, he just gave me an option of two things that's spark plugs or the cat.

Feb 4, 2014 | 11:27 AM

r2millers

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From: Southern Cal

Quote:

Originally Posted by Graham1222

Well, not a bad place to start, changing the plugs.

If it's a cat, you will slowly feel a decrease in power because of it plugging up the exhaust, severely reducing the volumetric flow. Nothing like putting a potato in the exhaust pipe.

I would also expect the truck to pull a code, knowing it monitors incoming and outgoing exhaust thru the cat and if it's out of spec, you'll see a code shortly.

Feb 4, 2014 | 06:40 PM

Graham1222

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Quote:

Originally Posted by r2millers

Well, not a bad place to start, changing the plugs. If it's a cat, you will slowly feel a decrease in power because of it plugging up the exhaust, severely reducing the volumetric flow. Nothing like putting a potato in the exhaust pipe. I would also expect the truck to pull a code, knowing it monitors incoming and outgoing exhaust thru the cat and if it's out of spec, you'll see a code shortly.

Yes and it's has had a slow decrease in power, now to the point where it just won't accelerate much at all. It was a gradual thing. I have already changed the plugs. What is throwing me off is it's not throwing CAT codes. It's showing bank 1 lean and bank 2 rich. So for some reason the two banks are off balance. I changed the MAF sensor and was told the o2 sensors wouldn't make it run this rough. Changed all vacuum hoses. Only left has to be CAT, or air intake sensor?? I'm lost!!!

Feb 4, 2014 | 08:53 PM

pdqford

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From: Central NYS

Lets see, a clogged cat can make one side run rich and the other side run lean?

Before I suggest something silly, just what model year/engine are we talking about?

Feb 5, 2014 | 12:20 PM

Graham1222

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Quote:

Originally Posted by pdqford

Lets see, a clogged cat can make one side run rich and the other side run lean?

Before I suggest something silly, just what model year/engine are we talking about?

2006 ford expedition 5.4

Feb 5, 2014 | 08:09 PM

pdqford

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Quote:

Originally Posted by Graham1222

2006 ford expedition 5.4

Oh, okay. That has the returnless fuel system, right?
Did you inspect the infamous FPDM to see if it is corroded?

You might be chasing more than one problem.
It would be reassuring that something didn't get lost in the translation if you had the specific codes.

That $2000 scanner should be able to report pendings as well as run the KOEO and KOER self tests. What did it show?

Feb 5, 2014 | 08:20 PM

Graham1222

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Quote:

Originally Posted by pdqford

Oh, okay. That has the returnless fuel system, right? Did you inspect the infamous FPDM to see if it is corroded? You might be chasing more than one problem. It would be reassuring that something didn't get lost in the translation if you had the specific codes. That $2000 scanner should be able to report pendings as well as run the KOEO and KOER self tests. What did it show?

No exactly sure. Not even sure if he ran all those tests. When he put it on the scanner all he told me is my fuel pressure was where it was supposed to be. Told me I think it was two cylinders misfiring and one other was weak. Told me start with doing a tune up. The truck is currently in the shop and I think they're also lost. They are yet to call me and tell me what's wrong and what it will cost to fix it. Though when they towed it there they said they'd call the same day as soon as they diagnosed it.