go to make a turn when going slow that my engine starts to stall?

2008 FORD F-150
133,000 MILES • 5.4L • V8 • 2WD • AUTOMATIC
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ALYSHA PEACOCK
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I have noticed after the engine heats up that when I go to make a turn when going slow that my engine starts to stall. I recently had a new engine put in it but it was doing this before and now after as well.
Sep 1, 2023 at 7:06 PM
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JACOBANDNICKOLAS
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Hi,

I'm not sure what was replaced when the engine was, but there are many possibilities causing this. Most commonly, an engine vacuum leak can cause a rough idle or stall at idle. However, I have a question. Does it only happen when turning or if you stop at a stoplight as well?

Additionally, if the throttle body throttle actuator is failing, it can cause this as well as a dirty throttle body. There are other things as well, but I don't want to overwhelm you with all of them.

So, let's start by checking for an engine vacuum leak. Here is a link that explains how it's done. Additionally, there is a vacuum hose on the rear of the throttle body that has a 90-degree bend in it. They commonly dry-rot and leak, so make sure to check that.

https://www.2carpros.com/articles/how-to-use-an-engine-vacuum-gauge

Next, if you service the throttle body, that can eliminate this type of issue. Here is a link that explains how that is done.

https://www.2carpros.com/articles/how-a-throttle-body-works

'If the check engine light is staying on while the engine is running, have the computer scanned as well for diagnostic trouble codes. Most parts stores will do it for you free of charge.

Let me know what you find or if you have questions.

Take care,

Joe

Sep 5, 2023 at 7:06 PM
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ALYSHA PEACOCK
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Thank you for your advice, Joe. Yes, it only tries to stall if I turn right or left and when I'm going slow. Could it be the power steering pressure switch? It did this before and after the engine was replaced.
Sep 7, 2023 at 9:49 AM
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ALYSHA PEACOCK
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I don't have a check engine light on, on my dash panel. Auto parts store said it wouldn't throw any codes since I didn't have check engine light on.
Sep 7, 2023 at 9:51 AM
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JACOBANDNICKOLAS
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Hi,

It could be related to PS pressure. On the other hand, it could be related to the Idle Control Valve. If you are at a stop with the vehicle in gear and not turning the steering, does it stall? Also, at what RPM does the engine idle under the same conditions?

One other question. If you turn the A/C on, does the engine stall under the same conditions?

Let me know.

Joe
Sep 7, 2023 at 1:41 PM
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ALYSHA PEACOCK
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Anytime at a low RPMs it stalls after the fact that the engine has heated up. I tried replacing the VCT Solenoid and that didn't work. I read that it might be Cam Phaser or its components. I just had the engine replaced with a rebuilt engine and it stopped doing it for about 2 weeks but then started doing it again. Idk what to do at this point.
Sep 22, 2023 at 2:10 AM
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ALYSHA PEACOCK
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I haven't run my A/C so I'm not sure if it does it with it on. At first it would only do it after the engine heated up, at low rpm and turning right or left but as time went on now it does it at low RPMs, after the engine has heated up and going forward too, not just turning. I've also replaced the starter and battery on this money pit of a vehicle.
Sep 22, 2023 at 2:31 AM
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JACOBANDNICKOLAS
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Hi,

Let me know what RPM the engine idles at while sitting still and in neutral. Then, turn on the A/C and let me know what happens.

Let me know.

Joe
Sep 22, 2023 at 1:15 PM