Rick's Free Auto Repair Advice

Rattling noise F150

Fix Rattling noise f150

Rattling noise, rough idle, check engine light.

If you own a 2004-12 Ford F150 or other truck with 5.4L three-valve V8 engine and experience a rattling noise, rough idle, check engine light, the repair may not be as serious as you thought. Ford has issued a service bulletin alerting dealers to defective variable valve timing solenoids.

variable valve timing solenoid, VVT, variable valve timing

Ford variable valve timing solenoid

The bulletin says the rattling noise is usually accompanied by a rough idle and an check engine light. If you check the codes, you might see P0021 P0022 P0340 P0341.

Ford advises to replace the solenoid on both banks with an updated design (Part No. 8L3Z-6M280-B) to eliminate the problem. You’ll also need to replace the VCT solenoid-to-cam cover gasket (Part No. 3L3Z-6C535-AA).

To double check the diagnosis, let the engine warm up. Then idle it to 1,500 RPM and abrutly release the pedal. Allow the engine to return to normal idle. If the engine rattles or runs rough and sets trouble codes, you’ve found the culprit.

The vehicles covered by the bulletin are:

2004-10 F-150s

2005-10 F-250s and F-350s

2005-12 Expeditions and Lincoln Navigators

2006-08 Lincoln Mark LTs.

©, 2013 Rick Muscoplat

Posted on by Rick Muscoplat

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