01 4.6 stalling

Pclaythomas · Oct 14, 2017

Hi guys,
I really need some help. I have an 01 Expedition with the 4.6.
I have replaced the tps, plugs, coils, fuel filter, mass air sensor, and added a cold air intake.
All this in an attempt to correct a stall that happens after the vehicle has been driven a while.
Also, the "service engine light" is on...again. I went to Autozone and they said it was a bad fuel cap. So, I replaced that.
Anyway, the motor stalls anytime I let off and then easily accelerate. Also, while the cruise is on.
Any ideas?

Bedrck47 · Oct 15, 2017

Post the codes that Autozone read.

How many miles on the expy.

Have you ever cleaned the exhaust ports thru the throttle body This requires that the throttle body be removed from the intake There is a good video on you tube about this

Pclaythomas · Oct 20, 2017

I have cleaned the egr,the throttle body and upper intake. The code is P0442. Fuel cap replacement. But, I did that,too. I did notice when I attempt to fill it up, I smell fuel and it looks like the rubber fuel elbow going into the tank is leaking. Could this be the cause of the code? Also, I can't fill it completely and the guage only registers it being 3/4.
Also, it has 195,000.

Bedrck47 · Oct 20, 2017

P0442 - EVAP Control System Leak Detected (Small Leak) The PCM monitors the complete EVAP control system for presence of a small fuel vapor leak. The system failure occurs when a fuel vapor leak from an opening as small as 1.016 mm (0.04 inch) is detected by the EVAP running loss monitor test.

After-market EVAP hardware (such as fuel filler cap) non-conforming to required specifications
Small holes or cuts in fuel vapor hoses/tubes
Canister vent solenoid stays partially open on closed command
Damaged, cross-threaded or loosely installed fuel filler cap
Loose fuel vapor hose/tube connections to EVAP system components
EVAP system component seals leaking (EVAP canister purge valve, fuel tank pressure sensor, canister vent solenoid, fuel vapor control valve tube assembly or fuel vapor vent valve assembly)

Pclaythomas · Oct 22, 2017

So, can this cause the stalling issue?
After it warms up, the stalling occurs more often.

1955moose · Oct 23, 2017

Any leaking hose, can and will cause a driveability issue. Basically our suvs are a sealed system, sort of like our body. Could you imagine trying to walk around with a deep cut in your arm or leg, with blood coming out. You wouldn't last long. Hoses that are designed to be sealed tight, then develop cracks and tears, are letting out the vacuum, or fumes that are supposed to be kept in. Have your system smoke checked. That's usually the fastest/easiest way to find bad hoses.

Sent from my N9131 using Tapatalk

toomanytoys · Oct 28, 2017

I don't see anything about iac. Was it swapped or reset?

Pclaythomas · Oct 28, 2017

,I just cleaned it. Replace?

toomanytoys · Oct 29, 2017

When you cleaned it, did you unplug and remove it? If so you need to reset it

Pclaythomas · Oct 29, 2017

Yes, I completely removed it. How do I reset it?

01 4.6 stalling

Pclaythomas

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Bedrck47

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