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Engine stalling

Tiny
DAVID40138
  • MEMBER
  • 2001 MERCURY MARQUIS
  • 4.6L
  • V8
  • 2WD
  • AUTOMATIC
  • 93,000 MILES
While driving at about 65-70 on the highway my car will jerk a few times and lose power. After that the engine will shut off. I know because I'll lose braking and steering power. I'm pretty sure this is the engine going into safe mode to protect itself. (As described in the manual)

The issue here is that my temperature gauge reads dead center the whole time. So I have no way of knowing the issue is coming on.

I've checked for coolant and leaks. Looks pretty nasty in overflow tank. But is to totally full.
Electric fans kicks in and runs when AC is on.
Oil looks fine. Not milky. Right where it needs to be.

I'm not sure what could be happening here but I guess it could be thermostat, water pump, or partial clog in the radiator.

Any way to trouble shoot these and pinpoint it exactly?
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Sunday, June 2nd, 2019 AT 5:57 PM

1 Reply

Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 42,884 POSTS
Hello,

It is not going into limp mode because the engine shut off but it could be a dirty throttle body or a bad fuel pump/crankshaft sensor, when the engine stalls can you hear the pump working in the tank?

Here are two guides to help us see whats going on:

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

and

https://www.2carpros.com/articles/car-cranks-but-wont-start

Please run down this guide and report back.
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Tuesday, June 4th, 2019 AT 1:39 PM

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