When driving it was loses power, sputters and dies

TAMMIEWILD

MEMBER
2001 MERCURY MOUNTAINEER
5.0L
V8
133,000 MILES

I changed the two coil packs, clean the mass air flow sensor, it has a new fuel pump. Here is what happens; when your driving it loses power, sputters and dies. So we change the coil packs. When we change then it was idling rough but drove, but then the other day the same thing happened again and it will start, but then dies right away.

7 Replies

HMAC300

MECHANIC
48,601 POSTS

Try resetting security system if no owners manual look online on how to do it for your truck. If it continues have a mechanic scan for codes as it may be a security module issue.

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Monday, October 3rd, 2016 AT 9:22 AM

TAMMIEWILD

MEMBER
3 POSTS

Would that make it not run right or idle right? Could it be computer?

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Monday, October 3rd, 2016 AT 9:40 AM

KEN L

MASTER CERTIFIED MECHANIC
47,643 POSTS

Hi TAMMIEWILD,

It could be many things causing this but it sounds like it might be the cat converter being plugged up.

Here are a couple of guide that can help you,

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

and

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

Please let us know what you find so it will help others.

Best, Ken

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Monday, October 3rd, 2016 AT 11:53 AM

HMAC300

MECHANIC
48,601 POSTS

Not running right could be anything so you shold start by scanning for codes and checking fuel pressure with a gauge. but when it cuts out after starting immediately that is a sign that it is a security issue. here is an article to help.
https://www.2carpros.com/articles/how-to-check-fuel-system-pressure-and-regulator

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Monday, October 3rd, 2016 AT 12:24 PM

TAMMIEWILD