Stalled in stop-and-go traffic

[PanchoBarrancas]

Today my '22 ecoboost stalled out of nowhere in the middle of traffic after releasing the brake. I got a message on the dashboard to shift into park to be able to start the enginge again. I noticed that when I shifted into drive, the engine would lug and stall over the course of about 4 seconds. I tried low range but that made no difference. It stalled on me 3 more times until I reved up to 3500 rpm and then shifted into drive in order to be able to move again.

After that incident my truck didn't stall again.

Maybe the torque converter clutch locked up? Who knows, I couldn't find a thread describing what I went through.

It has been about 20,000 km, 12,000 miles, since my transmission and torque converted where replaced under warranty. I also had my PTU and RDU flushed and filled with fresh fluid. I don't tow, I never load more than half of the maximum payload, I drive occasionally on dirt roads.

I hope this isn't a sign of more problems to come.

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[Mavster Mechanic]

Sorry to hear that.

One thing about a hybrid is that is almost impossible to happen.

1 in 1,000,000 the engine stalls.
But 99% of the time the hybrid will still be able to drive away to a safe spot on electricity alone.

Making getting stuck in an intersection more like 1 in 100 Million chance.

 

[Glen Baker LLC]

 

[Fibrepunk]

Since you have an EcoBoost, check battery and alternator.

 

[PanchoBarrancas]

Since you have an EcoBoost, check battery and alternator.

I highly doubt it's an electrical issue as the engine fired up 4 times in quick succession with the starter running at full speed, and the battery is at 12.7v right now that it is parked.

 

[PanchoBarrancas]

Sorry to hear that.

One thing about a hybrid is that is almost impossible to happen.

1 in 1,000,000 the engine stalls.
But 99% of the time the hybrid will still be able to drive away to a safe spot on electricity alone.

Making getting stuck in an intersection more like 1 in 100 Million chance.

...okay...

 

[Clarkdonbran]

Sorry to hear that.

One thing about a hybrid is that is almost impossible to happen.

1 in 1,000,000 the engine stalls.
But 99% of the time the hybrid will still be able to drive away to a safe spot on electricity alone.

Making getting stuck in an intersection more like 1 in 100 Million chance.

 

[Chops]

I’ve done that a couple times with a manual transmission. Of course, a manual car on an American highway is one in a million. In my town the honks start instantly…”Get off your phone idiot!!”

 

[Chops]

Sorry to hear that.

One thing about a hybrid is that is almost impossible to happen.

1 in 1,000,000 the engine stalls.
But 99% of the time the hybrid will still be able to drive away to a safe spot on electricity alone.

Making getting stuck in an intersection more like 1 in 100 Million chance.

Hybrids have lost power while driving. Limp mode. More than one in a million. More like 100 out of a half million.

 

[tiktokbrainrot]

I highly doubt it's an electrical issue as the engine fired up 4 times in quick succession with the starter running at full speed, and the battery is at 12.7v right now that it is parked.

Did you measure it right after driving? Because if you just parked it and it only measures 12.7v, then your battery is likely toast. It should read 12.7-12.8v after sitting for 8+ hours. Also, even if the voltage is good, you can still have a bad battery cell if one of the plates is failing. Better to test it with an actual battery tester and see what happens under load. If it has a bad plate, then voltage would be fine until you loaded it by trying to start the engine, resulting in the electrics going haywire and not releasing something or producing a weak spark that cant make enough power to keep the engine spinning.

If not.....then it wouldnt be the first replacement 8f35 that fails out. If it was a reman, and not brand new, its entirely possible there was some debris left that got jammed in something.

Or the brain just developed Alzheimer's and forgot to actually shift the transmission into park, resulting in a hard lug and stall. Or its unrelated to all this, it could be a separate electric issue, a frayed harness, ece.

 

[Mavster Mechanic]

Hybrids have lost power while driving. Limp mode. More than one in a million. More like 100 out of a half million.

Limp mode is a mode that allows you to drive at reduced speed. Usually 25 MPH. Which was precisely my point.

Different than being stranded / stuck in the middle of a road.

 

[Chops]

Today my '22 ecoboost stalled out of nowhere in the middle of traffic after releasing the brake. I got a message on the dashboard to shift into park to be able to start the enginge again. I noticed that when I shifted into drive, the engine would lug and stall over the course of about 4 seconds. I tried low range but that made no difference. It stalled on me 3 more times until I reved up to 3500 rpm and then shifted into drive in order to be able to move again.

After that incident my truck didn't stall again.

Maybe the torque converter clutch locked up? Who knows, I couldn't find a thread describing what I went through.

It has been about 20,000 km, 12,000 miles, since my transmission and torque converted where replaced under warranty. I also had my PTU and RDU flushed and filled with fresh fluid. I don't tow, I never load more than half of the maximum payload, I drive occasionally on dirt roads.

I hope this isn't a sign of more problems to come.

Today my '22 ecoboost stalled out of nowhere in the middle of traffic after releasing the brake. I got a message on the dashboard to shift into park to be able to start the enginge again. I noticed that when I shifted into drive, the engine would lug and stall over the course of about 4 seconds. I tried low range but that made no difference. It stalled on me 3 more times until I reved up to 3500 rpm and then shifted into drive…

Do you use the Stop/Start system? I never have - so I don’t know how it feels.

It is possible for an EFI engine to get “flooded” similar to the old carburetor engines. Maybe the ECU shut you down for too rich a mixture?

A flooded engine will get back to normal after revving a bit after it turns over. Gets the air/fuel mixture back into spec…

 

[PanchoBarrancas]

Did you measure it right after driving? Because if you just parked it and it only measures 12.7v, then your battery is likely toast. It should read 12.7-12.8v after sitting for 8+ hours. Also, even if the voltage is good, you can still have a bad battery cell if one of the plates is failing. Better to test it with an actual battery tester and see what happens under load. If it has a bad plate, then voltage would be fine until you loaded it by trying to start the engine, resulting in the electrics going haywire and not releasing something or producing a weak spark that cant make enough power to keep the engine spinning.

If not.....then it wouldnt be the first replacement 8f35 that fails out. If it was a reman, and not brand new, its entirely possible there was some debris left that got jammed in something.

Or the brain just developed Alzheimer's and forgot to actually shift the transmission into park, resulting in a hard lug and stall. Or its unrelated to all this, it could be a separate electric issue, a frayed harness, ece.

It is perfectly normal for the battery to drop to 12.7v a few minutes after shutdown. A battery disconnected from everything and freshly charged might hold 13.0 or higher for a while, but with the battery being plugged in and being discharged, albeit slowly, will quickly drop the extra surface charge.

After 10 hours parked, mine is at 12.6v, pretty good for a 4 year old battery that still delivers above the rated discharge current.

 

[Cherokee]

All this speculation.

OP, tell us what your dealer said.

 

[PanchoBarrancas]

Do you use the Stop/Start system? I never have - so I don’t know how it feels.

It is possible for an EFI engine to get “flooded” similar to the old carburetor engines. Maybe the ECU shut you down for too rich a mixture?

A flooded engine will get back to normal after revving a bit after it turns over. Gets the air/fuel mixture back into spec…

I drive with auto stop-start activated, but it was not triggering due to tbe stop and go traffic. For the flooded engine, not the answer as the engine ran fine in park and neutral and would only lug in drive.

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