Diagnostic ideas

[04lss]

So, as many of you know my ford has issues, it will bog down, loose huge amounts of power.
The last dealership that had it blamed the cats. and a bad turbo.

I want to preface this by saying at this point im over dealing with seller, the warranty people or ford, i simply want to get the car running. Im approaching this from a no warranty POV.



My father who also initially suspected the cats, pulled the exhaust apart. the DP cats were pristine, no clogging no discoloration. Not the issue. There was also no oil in the exhaust, and little oil in the IC. (likely what happens to all the Taurus's" however it was "repaired" the dealer was right so its not warrant able.
That said, gutting the slightly clogged rear cats did nothing to help. there is no flow stoppage in the IC.
My father also checked the wiring harness that the first dealer blamed and can find no exposed wires.

He was going to test the fuel pressure, but his kit will not interface so he must wait until he can use the scanner from his job.


Right now we have rulled exhaust out as a cause. We have also rulled the turbos and IC out. Both map sensors have been replaced.

My father suspects fueling, i suspect a sensor



id appreciate any thoughts.
\
Im getting to the point where im likely going to have to start throwing cash at it and seeing what works..

 

[xFallenxCripplex]

Have you tried data logging with FORScan or torque?

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[04lss]

ive done some basic scanning with torque but cant get the paramters i need like LTFT, STFT, Injector pulsewidth, Fuel pressure etc.

 

[xFallenxCripplex]

You probably could use FORScan on a laptop but looks like you need the external pids from http://www.ecoboostperformanceforum.com/index.php?topic=3141.0 to get you those sensors for torque.
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[glockcoma]

Ltft and stft are available on torque.

 

[glockcoma]

So is fuel pressure

 

[SilverSH0]

When was the last time the plugs were changed?

 

[StealBlueSho]

Could look at fuel trims, fuel pressure, and IAT sensors... If a sensor is reading hot air it will act like it's bogging down...checking plugs is not a bad idea... Although if you were getting a lot of misses you would throw a code.... Is the car running hot?

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[04lss]

So update, the intercooler WAS damaged and repaired.
Cleaning the IC did not resolve the problem we have Flow checked and boost checked both check out. The intake filter is fine. No solutions, in fact I drove it the other night. at a stoplight I hit the gas and nothing. Floored it Nothing ... bogged, waited 2-3 seconds of nothing then it started to move. then it did it again.
there are no codes other than the Cat efficiency codes.
2plugs replaced recently the rest ... I don't know but they didn't look bad.

My father used the scanner at his job to pull the following values.
Fuel tank transfer pressure 0 (no idea what it means)
LTFT -5 to -7
Fuel rail pressure max 875, avg 250

I don't believe the car is running lean or has a fueling issue at this point not with the LTFT being rich.

 

[SHOdded]

FTP = tank is fine, means there is no pressure buildup in the tank nor is there a vacuum. LTFT was at idle or driving? Seems high for this platform, but still within "tolerances". Fuel rail pressure - hard to say without a log to see what exactly you were/car was doing. What was the minimum, at hot idle? What was fuel pressure (LPFP) with Key On Engine Off?

 

[04lss]

all at idle. My understanding is that LTFT shouldnt change very much, its an average built over time. Short term FT on the other hand i could see changing. My father is going to read the driving values tonight.
The LTFT does seem a little rich, but IDK with the high flow exhaust

 

[StealBlueSho]

LTFT will change over time... temperatures play a role in that... if its hot one day.. and cold the next... the LTFT might read rich because LTFT tables are built from the STFT... its just a rolling average.. -+7% is not a huge deal... its a bit high but not enough that I would suspect a that being a major issue... this time of year is tough too because you have warm days and cold nights.. at least here in VA where its 90* on Monday and a high of 72* on Tuesday.. the LTFT values are compensating for warmer air but gets hit with colder air so its dumping more fuel for the added O2.. throws the trims off a bit...

Have you checked the FPDM? There have been A LOT of F150 EcoBoost that have the same issue you are having because the FPDM is on its way out.. there have been a few TSB's about them..they are about $60-$80 at the dealership..

FPDM drives the voltage to the LPFP... so if you are hitting the gas and FPDM is not responding in time, the car is not getting any fuel to go.. it would account for the bogging down...

 

[04lss]

Sorry im not used to some of the acronyms, can you elaborate on what an FPDM is?

 

[StealBlueSho]

Fuel Pump Delivery Module... it sits inline with the Low Pressure Fuel Pump and controls the voltage going to the Low Pressure Fuel Pump to control the fuel pump. I believe it controls the pump through adding and subtracting resistance on the ground wire.. at least thats what I read somewhere...

Usually it either works or doesn't, but there are a few people who had them "Start" to go bad where the FPDM wouldn't respond when going WOT.. it would bog out... have you had the car just die on you from idle? or die when you hit the gas? Those tend to be the more common issue with the FPDM...

 

[04lss]

Thanks for the explanation. The car has never died on me, but the other night, i went wot from a stop and nothing happened, like it was going to stall then it sort of went.

 

[StealBlueSho]

Any black smoke out that tail pipe when that happens?

 

[Kenneth Bridgman]

There is a recall coming out for our cars to have the fpdm replaced, will be released later this year.

 

[04lss]

dont think there is any black smoke.

 

[StealBlueSho]

dont think there is any black smoke.

Just wondering if maybe there is a leaky injector dumping too much fuel causing you to bog out when trying to go WOT...but there would be black smoke if it was bogging that much when it finally takes off...

 

[SHOdded]

Possible throttle body or tb sensor or motor issue