Vehicle has a shimmy/shutter when in any gear mostly when stopped?

DMBUIW

MEMBER
2008 FORD EXPEDITION
5.0L
V8
2WD
AUTOMATIC
212,000 MILES

Vehicle has a shimmy/shutter when in any gear. (Drive, Neutral, Reverse). Mostly feel it when stopped at light in drive with slight RPM drop. Tends to have issues when driving deciding which gear to be in around 45 -50 MPH. Have sprayed engine with brake fluid to look for vacuum leak. Doesn’t seem to have one. Air Filter looks clean. Have tried clearing the computer with the jumping the positive battery post to disconnect ground for 20 + minutes. Looking to see what the issue could be.

The vehicle listed above is an XLT.

Replaced following parts with OEM Motorcraft:

· Spark plugs
· Injection coils
· Throttle body
· Mass airflow sensor
· Intake air temperature sensor
· Evp purge valve

5 Replies

KEN L

MASTER CERTIFIED MECHANIC
47,665 POSTS

When you say "Injection coils" do you mean ignition coils? I would start by running the codes to see if any are stored which will guide us in the right direction for the repair.

https://www.2carpros.com/articles/checking-a-service-engine-soon-or-check-engine-light-on-or-flashing

Also, does this problem happen intermittently or constant?

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Tuesday, June 18th, 2024 AT 10:54 AM

DMBUIW

MEMBER
5 POSTS

Yes, meant ignition coils. No, check the engine light but scan for codes. No codes but Evap monitor did not complete their testing. I did replace that part (maybe got a defective one?).

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Tuesday, June 18th, 2024 AT 4:26 PM

KEN L

MASTER CERTIFIED MECHANIC
47,665 POSTS

Does it seem like the engine is misfiring? can you make a short video of the problem and upload it? If the engine is misfiring it should leave a trouble code.

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

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Wednesday, June 19th, 2024 AT 11:23 AM

DMBUIW

MEMBER
5 POSTS

Doesn't seem to miss fire (but I guess it could). This morning, I reset the computer and drove for 30 minutes at 55 MPH to let it relearn (no A/C or radio on) ran well. At stoplight had light intermittent shutter. A couple of hours later I took it out again but put on A/C first the shutter at the light became more frequent and noticeable. RPMs drop slightly on each shimmer. He ran a scan and no codes or light.

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Wednesday, June 19th, 2024 AT 12:31 PM

KEN L