It has a misfire on all cylinders

Tiny
KEVIN GODWIN
  • MEMBER
  • 1999 LINCOLN TOWN CAR
  • 120,000 MILES
Multiple cylinder misfire, no codes, cylinder contribution test shows skip on different cylinders every time I drive, only skips under light throttle going up hill, has coil on plug 4.6, coil or plugs help it
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Thursday, May 31st, 2012 AT 11:30 PM

8 Replies

Tiny
ASEMASTER6371
  • EXPERT
Check the basics. I would look at the plugs and coils. How many miles are on these items?

The injectors may also be an issue. They need to be professionally cleaned every 50k

Roy
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Thursday, May 31st, 2012 AT 11:33 PM
Tiny
KEVIN GODWIN
  • MEMBER
Injectors are clean and pass flow test, coils and plugs are new
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Friday, June 1st, 2012 AT 12:28 AM
Tiny
ASEMASTER6371
  • EXPERT
Ok, start with a compression test

Roy
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Friday, June 1st, 2012 AT 12:31 AM
Tiny
KEVIN GODWIN
  • MEMBER
Compression is good and timing chains are not stretched
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Friday, June 1st, 2012 AT 12:36 AM
Tiny
LBARAZAN
  • MEMBER
I have same troubles TC 1999 multiple misfire cylinder #4, 5, 6, and 8
what is causes of this troubles
is this a common trouble to TC model 1999?
I already check and simulate the following.

# Spark test at all cylinders. 4, 5, 6, 8 NO SPARK
# Simulate ignition coil and spark plug and fuel injectors. Crank sensor, cam sensor
same troubles occur no spark at cylinder 4, 5, 6, 8
# Continuity check wiring ign. Coil terminals---OK
#Simulate pcm, same trouble occur misfire 4, 5, 6, 8

compression is oky too.
NO codes given

please guide me and asking for any idea.

Thanks
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Friday, April 6th, 2018 AT 12:41 AM
Tiny
ASEMASTER6371
  • EXPERT
Do you have voltage to the ignition coils?

Does the check engine light come on with the key on, engine off?

Did you check the wires back to the PCM?

Roy
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Friday, April 6th, 2018 AT 4:06 AM
Tiny
LBARAZAN
  • MEMBER
The number of cylinder no spark are #4, 5, 6, and 8.
I already did switching the following.
Spark plug. Ignition coil. Fuel injectors. And still problems occurs no spark at ignition coil 4, 5, 6, 8.
I do compression test and the result is good compression.
I do check short to power and grounds. Result is oky too
what is next things to do?
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Monday, April 9th, 2018 AT 9:02 PM
Tiny
ASEMASTER6371
  • EXPERT
OK, did you verify power to the coils that are not firing?

What voltage did you have a t the coil with key on?

Roy
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Tuesday, April 10th, 2018 AT 4:14 AM

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