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Running very rough after intake manifold replacement

Tiny
V SHIRK
  • MEMBER
  • 1999 LINCOLN TOWN CAR
  • 4.6L
  • V8
  • 2WD
  • AUTOMATIC
  • 150,000 MILES
Intake manifold had a crack leaking a small amount of antifreeze towards front of motor. Replaced intake manifold with a brand new one. Since replacing, car runs very rough, though all injectors are working as well as coils. Car ran amazingly smooth before swap. Any ideas? Definitely not a first timer on turning wrenches but I am stumped.
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Friday, December 10th, 2021 AT 5:04 PM

3 Replies

Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 109,650 POSTS
Hi,

Are there any diagnostic trouble codes? What you described sounds like a simple engine vacuum leak. Have you checked and confirmed there are none? See link below.

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

Also, there was a TSB on the first runner coolant cross-over related to leakage. Is that where the problem was?

Let me know.

Joe

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Friday, December 10th, 2021 AT 9:14 PM
Tiny
V SHIRK
  • MEMBER
  • 2 POSTS
Thanks guys! I put a set of ignition coil boots in this morning and problem solved. I appreciate you taking the time to help me out.
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Saturday, December 11th, 2021 AT 4:03 PM
Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 109,650 POSTS
Hi,

You are very welcome. I'm glad to hear it's running properly again.

Please feel free to come back anytime in the future if you have questions.

Take care,

Joe
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Saturday, December 11th, 2021 AT 10:09 PM

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