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Hesitation when accelerating intermittently

Tiny
TOWNCAR FAN
  • MEMBER
  • 1994 LINCOLN TOWN CAR
  • 4.6L
  • V8
  • 2WD
  • AUTOMATIC
  • 174,518 MILES
The engine hesitates when accelerating, but not all the time. No triggering factors except for acceleration and moving. Up, down hill, or flat does make it happen more or less times. Never happens at idle. Nothing shows up on the codes. I have replaced plugs, wires, cap rotor, injectors and EGR value. History: the car was a very well maintained limo in San Fransisco until I purchased it 1/4/2018. I was informed of the hesitation when I purchased it, but it has gotten must worse since then.
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Tuesday, May 21st, 2019 AT 12:23 PM

10 Replies

Tiny
ASEMASTER6371
  • MECHANIC
  • 52,797 POSTS
Good afternoon,

Have you verified the fuel pressure? That is where I would start.

https://www.2carpros.com/articles/engine-hesitates

Low fuel pressure will cause this issue.

https://www.2carpros.com/articles/how-to-check-fuel-system-pressure-and-regulator

Also, the timing could be the issue if the chains, guides or tensioner are worn.

Roy
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Tuesday, May 21st, 2019 AT 12:41 PM
Tiny
TOWNCAR FAN
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  • 6 POSTS
I know the fuel filter has been replaced, vacuum lines checked and the timing has been checked, but will double check the fuel pressure. FYI two mechanics have already tried to fix the problem. Thanks
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Tuesday, May 21st, 2019 AT 1:37 PM
Tiny
ASEMASTER6371
  • MECHANIC
  • 52,797 POSTS
Okay, how did they verify timing?

What exactly did the two shops do for you?

Roy
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Tuesday, May 21st, 2019 AT 2:05 PM
Tiny
TOWNCAR FAN
  • MEMBER
  • 6 POSTS
I was not present but he said he did the plugs, wires, cap fuel filter, rotor, compression test and checked the codes and timing. He may or not have checked the fuel system, I don't recall. I did the injectors. The second one checked the codes and replaced the EGR value, R&R plenum to clean out EGR passage, cleaned throttle plates and performed KOER test.
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Tuesday, May 21st, 2019 AT 2:25 PM
Tiny
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Not sure how he did the timing.
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Tuesday, May 21st, 2019 AT 2:26 PM
Tiny
ASEMASTER6371
  • MECHANIC
  • 52,797 POSTS
Without removing the front cover of the engine, there is no way to verify the chains.

Roy
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Tuesday, May 21st, 2019 AT 2:50 PM
Tiny
TOWNCAR FAN
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Roger that.I doubt he did that.
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Tuesday, May 21st, 2019 AT 3:06 PM
Tiny
ASEMASTER6371
  • MECHANIC
  • 52,797 POSTS
Okay, I would find someone else who will do a complete diagnostic for you to determine the issue.

Roy
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Tuesday, May 21st, 2019 AT 3:10 PM
Tiny
TOWNCAR FAN
  • MEMBER
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I believe the second mechanic will be able to do that. I really only came to him regarding the EGV issue.

Thanks for all your advice!
Robert
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Tuesday, May 21st, 2019 AT 3:17 PM
Tiny
ASEMASTER6371
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You are welcome.

Always glad to help.

Roy
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Tuesday, May 21st, 2019 AT 3:24 PM

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