Windshield wipers will shutter or hesitate while in delayed mode, they operate ok if placed on constant wipe.
Excessive grease in wiper motor. Motor needs to be removed and the grease cleaned out. Regrease only the areas needing to be greased.
There is also a recall for this vehicle for the wiper module. Call the dealer with your vin # to see if it has been done. I will post the instructions for motor removal and install.
1. Turn the key to the OFF position.
2. Open the hood.
3. Remove the three push-in retainers that attach the air inlet grille (leaf screen) to the plenum sheet metal.
4 . Lower the hood to the secondary latch.
5. Using a suitable marker or masking tape, mark the location on both wiper blades on the windshield.
6. Remove the covers from the nuts that attach the wiper arms.
7. Remove the nuts from the wiper arms.
Important
If the rocking action in the next step fails to loosen the wiper arm, it may be necessary to use a standard top-post battery cable terminal puller to remove the wiper arm.
8. Rock the wiper arms back and forth to loosen and remove them from the wiper transmission shaft.
9. Remove the antenna mast.
10. Remove the 10 mm hex head nut that attaches the left and right ends of the air inlet grille to the plenum sheet metal.
11. Remove the air inlet grille and reposition it up to the windshield. It is not necessary to disconnect the washer hose.
12. Remove the two 10 mm hex head bolts that attach the wiper module to the plenum sheet metal.
13. Disconnect the electrical connector.
14. Position the new wiper module to the vehicle and connect the electrical connector.
15. Install the wiper module in the plenum sheet metal.
16. Install the two 10 mm hex head bolts that attach the module to the plenum sheet metal. Tighten nuts to 30 N·m (22 lb ft).
17.Turn the ignition switch to the ON position, turn the wiper switch ON, and visually verify that the wiper transmissions operate. After visually verifying operation, turn the wiper switch to the OFF position and allow the wiper transmissions to stop moving before turning the ignition switch to the OFF position. The wiper motor will now be in the PARK position.
18. Using the marks or masking tape that were placed on the windshield, align and position the wiper arms on the wiper transmission shafts.
19. Install the nuts on the wiper transmission shafts. Tighten the nuts to 30 N·m (22 lb ft).
20. Install the covers on the wiper arm nuts.
21. Remove the marks or masking tape from the windshield.
22. Open the hood.
23. Install the three push-in retainers that attach the air inlet grille to the plenum sheet metal.
24. Close the hood.
25. Verify that all functions of the wiper system (low, high, delay, etc.) operate properly.
It sounds like one of two things the intermitint relay or the wiper motor
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