Pops and sputters out

Tiny
DEKOTABROWN
  • MEMBER
  • 1997 MERCURY MOUNTAINEER
  • 100,000 MILES
Engine size 5.0. Fuel pressure perfect but truck needs more than it should to run and it still pops and sputters out.
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Tuesday, February 26th, 2019 AT 10:53 PM

1 Reply

Tiny
JACOBANDNICKOLAS
  • EXPERT
Welcome to 2CarPros.

This could be a few things. It could be ignition related, a major engine vacuum leak, or even a plugged catalytic converter.

First, take a look through this link and see if it helps.

https://www.2carpros.com/articles/stall-at-idle

Next, if that link isn't helpful, I have a few questions. First, is the check engine light staying on when it is running? Why do you feel it needs more fuel pressure than the manufacturer's specs? What is the fuel pressure?

Let me know about the check engine light. When the engine stalls, does the engine start right back up? If the light stays on, have the computer scanned to identify diagnostic trouble codes. If it isn't on, then I need you to check a couple things. First, I want you to check for engine vacuum leaks;

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

Next, check for a possible plugged catalytic converter.

https://www.2carpros.com/articles/how-to-test-a-catalytic-converter

https://www.2carpros.com/articles/bad-catalytic-converter-symptoms

Also, this could be related to a crankshaft position sensor. Take a look through this link and let me know if it mirrors what you experience.

https://www.2carpros.com/articles/bad-catalytic-converter-symptoms

With diagnostic trouble codes, we will need to eliminate one problem at a time.

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

Take care,
Joe
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Wednesday, February 27th, 2019 AT 9:01 PM

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