No gas pedal throttle response

Good morning,

There is a fault code stored for this issue.

The common causes are the throttle body or the APP or the pedal sensor itself.

https://www.2carpros.com/articles/reduced-power-limp-mode

You need a real scan tool to access the codes. Once you get the codes, then post them here so I can help further.

Roy

If a code is being given the SCT tuner will pick it up.

I do not know about that at all. I only rely on a real scan tool, not those generic units.

Roy

Father has a real good obd2 scanner. Will get over there...

The SCT tuner is not generic... expensive tuning device.

Okay, let me know what you find.

Roy

No codes came up other then then the 4 o2 sensor codes and EVAP purge valve code that came up as we discussed prior.

Okay, are they still active?

They will have nothing to do with your issue.

I attached a wiring diagram for you to view of the throttle body control.

Check the connector to be sure it is clean, tight and no damage. It is a common issue for this problem.

With your scan tool can you read live data on the pedal sensor inside the truck?

Roy

All the previous codes I mentioned are still active. Nothing new.

The obd2 reader is still with my father, He will not lend it to me.

I have driven the vehicle today with no such throttle issues... but I am concerned for reliability and distance at this time.

Will check the connectors and clean the entire throttle body unit and re install.

A new throttle body motor is $230 and a TPS sensor is $146...

Would be nice to get an actual code so I am not just throwing parts at it...

Give that a try and let me know what happens.

https://www.2carpros.com/articles/throttle-actuator-service

Roy

Well we have a deeper more serious issue here with PCM...

I changed all the parts that were throwing codes, did a KAM and hard reset ( both battery terminals together 5 minutes ) and cleared all codes on computer.

Restart vehicle with all new O2 sensors and evap purge valve...

All codes came back and still having throttle body issues and no foot pedal response after cleaning the T.B.

Flagship1 is a horrible company to deal with and they are denying anything wrong with their supplied PCM unit. I have issues a PayPal dispute and will seek refund in full.
After reading all the bad reviews on BBB and google itself I am kicking myself...

Just spent $457.00 on new parts for nothing... On top of $820.00 for the PCM with Flagship1.

Roy do you have a trusted supplier for new PCM unit ? Seems we are back to the initial problem now ! So frustrating!

I understand completely.

Can you give me the ECM number please and let me check.

roy

This is the factory ECM that was in vehicle from Ford. since manufacture.

8L2A-DA / 8L2A-12a650-PC
PCM170F DAP2 8B121 EE0FA
S/N W18CHW5M2GL2

Let me check around.

Roy

Okay. Thanks.

I found this for you.

I used to use these guys and they were very good.

https://store.allcomputerresources.com/2008-ford-explorer-8l2a-12a650-pc-pcm-ecm-ecu-engine-computer.html

Roy

Thanks !

I have emailed them the PCM info and the link you put up.

Waiting for reply with total shipped to Canada.

Hopefully this will solve all the issues including the first one with the charging system !

I am at my wits end !

You are welcome.

Always glad to help.

Roy

Hi Roy. So I ordered and received my new PCM from AllComputerResources.

I had to go to the ford dealer to have the new PCM installed which was costly.

Went to pick up the truck next day and did not even get off the lot before I received another code and loss of power and throttle response issues.

Took it back and a another day later they diagnosed a bad TPS sensor on the throttle body. Another $165.00 to replace that sensor and I was on my way.

Continued to drive the truck for about 1 1/2 weeks and now I am getting intermittent voltage spikes again.

On my display, when first starting the vehicle in the morning, volts read 14.6 or so with some fluctuations and steadily drops to about 13.6 after the truck warms up.

After the truck warms up 20 minutes or so I will start to see intermittent voltage spikes from regular 13.6 -13.8 and increasing / jumping up to 15.2 and as high as 15.9 almost 16 volts.

This seems to normally happen when I depress the accelerator pedal but sometimes even just while idling at a stop light.

Do you have any further suggestions, this is what normally happens right before the alternator will fail, but it has not failed as of yet and is still charging.

Pretty disappointed as I now have over $1,400.00 into this and still having charging issues after new alternator, new PCM and a various other parts installed.

Okay, the voltages, are you testing at the battery while it is running?

Also, when you check the charging system, did you check for AC voltage at the battery?

15.9 is too high as you know.

That would be voltage regulator in the alternator.

Roy

Okay,

So your saying that the new alternator has a failing voltage regulator already? It is not even 2 months old!

Why does this keep happening?

Could I have a bad ignition coil (COP) causing this? It was a suggestion from another tech I am speaking with....

No, to the coil. That has no control over charging system.

You had those other ECM's and that is part of the system check.

The regulator is inside the alternator. When you checked the voltage at the battery, did you also check for any AC voltage?

https://www.2carpros.com/articles/how-to-check-a-car-alternator

Roy

HY: Generator/Regulator System

HY: Introduction See: Computers and Control Systems > Pinpoint Tests > HY: Generator/Regulator System - Introduction



HY1 CHECK THE GENERATOR CIRCUITRY AND OPERATION


Note:If the concern is still present after checking the generator circuitry to continue generator diagnosis.

Check for any generator related DTCs. Refer to Charging System, Charging System to diagnose any generator related DTCs.
Is the charging system diagnosed and repaired in Charging System, Charging System?
Yes

The system is operating correctly at this time.

No

GO to HY2
.



HY2 CHECK THE GENERATOR MONITOR SIGNAL


Key ON, engine running.

Access the PCM and monitor the GENMON PID.
Is the duty cycle between 5% and 97% and not excessively fluctuating?
Yes

The system is operating correctly at this time.

No

GO to HY3
.



HY3 CHECK FOR CORRECT PCM OPERATION


Note:When the battery (or PCM) is disconnected and connected, some abnormal drive symptoms may occur while the vehicle relearns its adaptive strategy. The charging system set point may also vary. The vehicle may need to be driven to relearn its strategy.

Disconnect all the PCM connectors.

Visually inspect for:
pushed out pins
corrosion
Connect all the PCM connectors and make sure they seat correctly.

Carry out the PCM self-test and verify the concern is still present.
Is the concern still present?
Yes

INSTALL a new PCM. REFER to Section 2, Flash Electrically Erasable Programmable Read Only Memory (EEPROM) See: Computers and Control Systems > Diagnostic Trouble Code Tests and Associated Procedures > Flash Electrically Erasable Programmable Read Only Memory (EEPROM), Programming the VID Block for a Replacement PCM.

No

The system is operating correctly at this time. The concern may have been caused by a loose or corroded connector.