5.0 so running rich (help!!!!!)

Topic: 5.0 so running rich (help!!!!!) (Read 10627 times) previous topic - next topic

5.0 so running rich (help!!!!!)

Reply #30 – February 25, 2014, 07:07:48 PM

Wha

5.0 so running rich (help!!!!!)

Reply #31 – February 25, 2014, 08:58:44 PM

Just jumping in here. Sounds like the TFI could be suspect. Motorcraft TFI is what I trust. If you did the PIP and used the old TFI module, I would swap it.

What codes is the computer giving you after that......

Could be a short in the TFI circuit wiring, or many other things.

How are you verifying its running rich.... by smell or by reading of O2 sensors???

5.0 so running rich (help!!!!!)

Reply #32 – February 25, 2014, 09:12:37 PM

Quote from: mcb82gt;429586

Just jumping in here. Sounds like the TFI could be suspect. Motorcraft TFI is what I trust. If you did the PIP and used the old TFI module, I would swap it.

What codes is the computer giving you after that......

Could be a short in the TFI circuit wiring, or many other things.

How are you verifying its running rich.... by smell or by reading of O2 sensors???

+1.

If it's not throwing a rich code it's not rich. Check for codes. Without them you're just guessing at what the problem is.

5.0 so running rich (help!!!!!)

Reply #33 – February 26, 2014, 12:05:42 AM

Quote from: TOM Renzo;429548

That is not a vacuum leak. That is a sensor that when Vacuum is removed from it forces the ECM RICH!!! Totally different from a vacuum leak. Clearly you have never dealt with FUEL TRIM NUMBERS OR ISSUES!!!! Removing a vacuum line from a MAP drives the ECM rich not because of a vacuum leak because that is how the sensor works. Install a voltmeter on the O2 and monitor it's output while instituting a vacuum leak and post back the results. Then you will understand why a vacuum leak always DRIVES AN ENGINE LEAN. Bottom line is a vacuum leak always leans out an engine PERIOD CASE CLOSED!@!!

So if a vacuum leak drives an engine RICH what does excessive fuel do drive it LEAN D'OH!!!

unless its in the hose to the vacuum tree, the break booster, or map sensor, like 90% of all vacuum leaks on on these cars. if any of those break, then the map sensor looses vacuum and runs rich.

I don't get why you can't agree with someone when you know that they are right. must be nice to get old and have everyone ignore you to the point you think you have to be right no matter what.

5.0 so running rich (help!!!!!)

Reply #34 – February 26, 2014, 06:44:25 AM

unless

5.0 so running rich (help!!!!!)

Reply #35 – February 26, 2014, 06:59:53 AM

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5.0 so running rich (help!!!!!)

Reply #36 – February 26, 2014, 07:37:42 AM

Lean F

5.0 so running rich (help!!!!!)

Reply #37 – February 26, 2014, 08:25:08 AM

OK so I can tell by smell the car is running rich the tail pipe is nothing but black soot an I have replaced the TFI an I'm not sure on what you all main by the PIP an as I stated before I have no vacuum leaks have to work again tonight but I'll try to have y'all some more information soon as I can an I use a cheap TFI from local parts store didn't have funds for a good one thinking its about time just to replace the whole distributor an TPS the only things I haven't replaced lol

5.0 so running rich (help!!!!!)

Reply #38 – February 26, 2014, 08:46:21 AM

(Profile

5.0 so running rich (help!!!!!)

Reply #39 – February 26, 2014, 09:25:33 AM

Quote

OK so I can tell by smell the car is running rich the tail pipe is nothing but black soot

I'll give an example on one of my own vehicles for reference.
Driving along one day in my Mustang my check engine light comes on.....Hmmm OK. I baby the car home as I'm about two blocks away and pull in the driveway. I take note that I'm basically rolling coal out of my exhaust and I can smell the gas..... I pull out the scanner and go through my checks. LEAN CODE. After opening my hood and looking around I notice a single line off. It's the EGR line that runs to my air intake just in front of the throttle body on this car. If I remember correctly this line has a 5/16" inner diameter. Not very large in the grand scheme of things, right? It was enough to make it show one thing and the ECU to tell me another.

You say there's really no vacuum leak and I'm inclined to take your word for it. Were both the PIP and TFI changed? Or just one? I can't really tell through all the posts. I see a couple of other things were changed as well. Was all this stuff changed AT THE SAME TIME? From the way your post reads it wasn't so I have to agree with TR and state go over what you changed and swap it out for known good stuff.

Also; For people who may read this down the road; pictures for reference:

Last, but not least; HAYSTACK, CLEAN OUT YOUR PM BOX!!!

5.0 so running rich (help!!!!!)

Reply #40 – February 26, 2014, 01:44:01 PM

Not

5.0 so running rich (help!!!!!)

Reply #41 – February 26, 2014, 02:05:11 PM

Yeah, I was just kinda showing with a real world example was all. Your gut says "Oh, it's running pig rich" and the ECU is in fact trying to compensate, but running a diagnostic reveals the truth in situations like this.

5.0 so running rich (help!!!!!)

Reply #42 – February 26, 2014, 05:02:45 PM

Sry meant to add this in last post I know the car is running rich because I had it scanned abouta couple months ago scanner said running rich on baank 1 so I know the car had been running a little rich before an I only changed the TFI
Will try to work on car 2 after work an thanks to everyone for there help

5.0 so running rich (help!!!!!)

Reply #43 – February 27, 2014, 12:13:26 PM

I am trying to get a understanding of what everyone is posting here ,so I have a question to ask.
Let me first say that I have minimal knowledge of a efi fuel system (that is why I have a carb system)and simply asking out of curiosity.
So my question: is this car running rich ,do to a lean condition ? This is what I am gathering from all of this !!
Am I way off by thinking this ?

5.0 so running rich (help!!!!!)

Reply #44 – February 27, 2014, 10:48:34 PM

Quote from: Chooglin;429701

I am trying to get a understanding of what everyone is posting here ,so I have a question to ask.
Let me first say that I have minimal knowledge of a efi fuel system (that is why I have a carb system)and simply asking out of curiosity.
So my question: is this car running rich ,do to a lean condition ? This is what I am gathering from all of this !!
Am I way off by thinking this ?

In a nut shell, a small vac leak in SD EFI system will cause a lean condition, IF that leak is at the MAP sensor or line connected to it, system will be very rich as the MAP mostly determines the amount of load in these systems by monitoring vac level... Low vac at MAP = heavy load, system increases injector pulse... This is also why you can't run a long duration cam with these systems as vac will be low...

In a MAF system the MAP becomes a baro sensor(no vac connected to it), any leak past the MAF meter will cause a lean condition...

Of course the systems can adapt if something isn't grossly out of order...

As far as throwing parts at it, Ford says fix the FIRST code given and then retest, if there are additional codes address those after first is fixed... Probably 95% of the time this procedure works...