The other day, I made a quick trip around the corner to the store, and wound up limping home in idle when I started driving back due to all of a sudden, the gas pedal did not respond. The truck itself never has had accel problems or issues such as this before. I pulled codes, but there were none and was no check engine light either. There is also no white smoke out the back, and I replaced the filters again as a precaution. Also tested the fuel pressure which is reading about 58 psi. Due to lack of codes, kinda at a loss of where to start....

Tim

 

It could be that the EGR Valve is sooted up, do you have any Gauges to read live data?

 

Taken straight out of the Ford PC/ED on description and operation of the accelerator input to the PCM:

The field highlighted in bold red will clearly describe the condition that needs to be present in order for the engine to default to engine idle only operation. Having said that, there are THREE APP sensor inputs that need to be read in order to determine if there is a problem present with either the circuit(s) or the actual accelerator pedal itself involved with the issue you appear to be having.

The three APP sensor readings are as follows:

APP #1 Closed Throttle 3.9 - 4.2 Wide Open Throttle 0.7 - 1.2

APP #2 Closed Throttle 1.4 - 1.6 Wide Open Throttle 3.6 - 4.1

APP #3 Closed Throttle 0.8 - 1.1 Wide Open Throttle 3.1 - 3.5

By the way, those numbers in the chart posted above are expressed in volts. So as you can see, with the pedal at rest should indicate lower voltage number readings and increase proportionately to the higher end numbers for APP sensors #2 and #3 as the pedal is depressed further toward the end of its travel, while APP #1 begins at higher number voltage readings and decreases proportionately to lower numbers as the pedal is depressed further downward toward the end of its travel respectively.

You will of course, require a scan tool that can read this live data to see if those three number readings change accordingly with the pedal depressed throughout its range of travel. If any one, two or all don't respond, then the problem lies within the circuitry (or the component itself). If all three numbers do respond as described as they should above, then the PCM likely "sees" a condition present that it doesn't "like" to cause it to default in an idle only operation.

 

Thanks for posting M-Chan, That's way over my head. I do have to ask because this happened once on my truck, and I thought by cleaning the valve I got lucky, What are the chances of this recurring ?Its been a few years since then. Again Thank you for your advise.

 

To be completely honest, it's very difficult to really diagnose something like this over the internet with any degree of certainty, as opposed to physically seeing what the vehicle is doing.

To your credit, I HAVE seen my share of trucks as a complete no-start due to a completely plugged EGR valve just caked with carbon to the point of jamming the valve open. In those cases, replacement is the only successful repair. But to know for sure if this really is the cause of the OP's issue, would require not only the three APP sensor inputs described above, but also FUEL_PW and maybe even ICP (volts/psi) and IPR duty cycle as well. When engine speed increase is requested by the driver via accelerator pedal depress, all of the data above should increase/decrease in proportion to the engine speed increase requested. Whether or not the engine actually does it and how it behaves is what also needs to be looked at, in conjunction with monitoring all the data above to really make a determination as to what direction the course of repair is to take.

But in answer to your question, I honestly think cleaning your EGR valve was either a fluke, or did absolutely nothing to repair your symptom. I would more or less suspect it was a momentary glitch that caused it.

 

Thanks Mike, I'll have to read this again tomarrow for it to compute LOL its been along day. Sorry OP bad advice. and if you do pull the Valve and it runs better

 

I'll take a look at the valve, I do have something that can take a bit of live data , 04badford - what are you looking at reading? I'll check the APP also, used the same tool for a cursory look, but it gave output in percent, not voltage, so I will look at maybe shooting the wires with a multimeter-I have been trying to find the post on doing this again (testing APP), but cannot find the one with on testing with a MM. Anyone have this info? I'll see if I can measure IPR and ICP with my scanner......

Would be easier with a code.....what else can maybe fail, without kicking codes and cause this?

 

Im not so sure I think M- Chan has the Info, maybe TPS (throttle position senser) would be in Question with APP, lets see what Mike has. like I posted above but it was fluke /or not?
EGRvp (valve position volts)koeo-0.8 low-0.8-1.0 high-1.3
EGR dc (duty cycle percent)koeo-0 low-0-15 high-32
APP= Volts koeo-0 low-0 high-13
app1=Percent koeo-4.0 low-4.0 high-3.4
app2=Percent koeo-1.4 low-1.4 high-1.9
app3=Percent koeo-0.9 low-0.9 high-1.4
Im trying to find the scan gauge Pids for these , so heres the Values.
remember koeo (key on engine off)
low (Idle in park, AC and radio off)
high ( 2500 rpm in park)

 

Your values above, appear to be smack dab within exactly where they should be under the conditions you've described.

 

Well, unfortunately the EGR valve is not wanting to come out, so I have a feeling either way, that its pretty gunked up. What should have been a 2-3 hour job of what I initially wanted to check is taking pretty much all day.

Question now - since I went through the trouble of taking it off, and lets say its cleanable, is there a way to check the egr 'off vehicle?' (Resistances....etc)

 

Dead pedal and ScanGauge

AP% 07E02209D4 0462050906D4 3008 000100020000 Accelerator Pedal Position (%)

TP1 07E0220917 046245090617 3010 0064040000000
TP2 07E0220918 046245090618 3010 0064040000000
TPA 07E022093C 04624509063C 3010 0064020000000
TPC 07E022091A 04620509061A 3010 0020000010000 Throttle Position Commanded (Degrees)
TPD 07E022091A 04624509061A 3010 0064020000000

Throttle Position 1 (Volts). Voltage of the ETC Throttle Position Sensor number 1
Key On = 4.0
Low Idle = 4.0
High Idle = 3.4
Operating Range = 0.7
‐ 4.2
Throttle Position 2 (Volts). Voltage of the ETC Throttle Position Sensor number 2
Key On = 1.4
Low Idle = 1.4
High Idle = 1.9
Operating Range = 1.4 ‐ 4.1
Throttle Position Actual (Degrees). The measured throttle angle from the throttle sensor inputs.

Throttle Position Desired (Degrees). ETC Commanded Throttle Angle

Accelerator Pedal Position (%)
Key On = 0
Low Idle = 0
Hi Idle = 13
Operating Range = 0‐17.75

 

Not saying this is the correct way to do anything, but, there was a post I had read that was having this issue. He mashed the pedal to the floor rapidly about 20 times and it cleaned up the sensors. Just saying.

 

Read another post were a guy cleared it up by spraying contact cleaner in it. Not sure how long that "fix" might last but got it going again.

 

Thank you Rusty,

 

Take the Values and post, the guy was in the valley who was a farmer ( like me ) the Thottle /Petel was gunked up by the boot debrie , under the right foot is the TPS spray Electrical cleaner very well .