When driving it was loses power, sputters and dies

Tiny
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.
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Monday, October 3rd, 2016 AT 8:21 AM

7 Replies

Tiny
HMAC300
  • EXPERT
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
Tiny
TAMMIEWILD
  • MEMBER
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
Tiny
KEN
  • ADMIN
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
Tiny
HMAC300
  • EXPERT
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
Tiny
TAMMIEWILD
  • MEMBER
We had it running for fifteen minutes but when you give it gas it cuts out, but not immediately.
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Monday, October 3rd, 2016 AT 1:02 PM
Tiny
SATURNTECH9
  • EXPERT
I would check fuel pressure also for codes in the codes in the computer. As well as the catalytic converter for being plugged. That will let it run good then loose power and even die if it is plugged enough.
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Monday, October 3rd, 2016 AT 1:10 PM
Tiny
KEN
  • ADMIN
Here is a thought, try disconnecting the TPS and EGR sensor and try it. Let us know how it goes.
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Monday, October 3rd, 2016 AT 1:38 PM

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