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Emission light on

Tiny
JUDITH BELLI
  • MEMBER
  • 2007 FORD TAURUS
  • 4WD
  • AUTOMATIC
  • 80,000 MILES
About Two weeks ago, auto not having much power when driving. Son did complete tune-up replacing spark plugs, wires, coil. It is running 80% better but still rough. It was checked on machine at a auto supply store which indicated numbers four and five plugs not working 100%.

Forgot to mention emission light will not go off
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Friday, January 5th, 2018 AT 9:59 AM

11 Replies

Tiny
MHPAUTOS
  • MECHANIC
  • 31,937 POSTS
Check compression's, check for vacuum leak at inlet manifold, check injectors if all else is okay, start here.
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Friday, January 5th, 2018 AT 6:04 PM
Tiny
JUDITH BELLI
  • MEMBER
  • 7 POSTS
Appreciate your response. Will check out all these possibilities. Thank you so much.
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Saturday, January 6th, 2018 AT 8:10 AM
Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 47,602 POSTS
Hello,

To me it sounds like you may have a blown head gasket between to cylinders which a compression test will confirm. (two low cylinders)

Here is a guide to help you get the job done.

https://www.2carpros.com/articles/how-to-test-engine-compression

This guide can help as well

https://www.2carpros.com/articles/engine-misfires-or-runs-rough

Please let us know what you find. We are interested to see what it is.

Cheers, Ken
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Monday, January 8th, 2018 AT 2:00 PM
Tiny
JUDITH BELLI
  • MEMBER
  • 7 POSTS
Thought it might be a blown head gasket; car getting checked out today with mechanic at local service garage. Will let you know. Thank you for all your responses.
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Monday, January 8th, 2018 AT 2:17 PM
Tiny
JUDITH BELLI
  • MEMBER
  • 7 POSTS
Just found out that the coil we bought & put on car was defective & has to be brought back to AutoZone. Supposedly auto is working fine now. Haven't got bill yet. Thanks for all your responses.
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Tuesday, January 9th, 2018 AT 10:39 AM
Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 47,602 POSTS
Thanks for getting back to us. Autozone parts can sometimes be a little dodgy. Please let us know how much it costs please

Cheers, Ken
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Tuesday, January 9th, 2018 AT 11:46 AM
Tiny
JUDITH BELLI
  • MEMBER
  • 7 POSTS
Well, the first coil was about $63 & took 2 min to install. Now don't know what service garage will charge when they were supposed to jut check out problem & let us know, not repair. Very upset!
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Tuesday, January 9th, 2018 AT 12:15 PM
Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 47,602 POSTS
It's just car stuff, it will pass. When doing the job next time get OEM parts they cost more but worth it. Amazon has good prices on OEM parts.
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Tuesday, January 9th, 2018 AT 1:19 PM
Tiny
JUDITH BELLI
  • MEMBER
  • 7 POSTS
The cost of "checking problem" & repair came to $137. Awful amount since the cost of coil was $63 & 2 min to install by son himself. Oh well. Already in debt up to ears.
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Tuesday, January 9th, 2018 AT 2:31 PM
Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 47,602 POSTS
Sorry about that, at least the car is fixed and the questions are free so that works. Use 2CarPros anytime, we are here to help. Please tell a friend.

Cheers, Ken
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Wednesday, January 10th, 2018 AT 11:32 AM
Tiny
JUDITH BELLI
  • MEMBER
  • 7 POSTS
I agree & I will!
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Wednesday, January 10th, 2018 AT 1:02 PM

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