[jrd123]

04 with 105K miles: just had my timing belt and spark plugs replaced at the dealer.

Van runs fine but mileage has dropped by average of 4-5 mpg.


Is there a connection or known issue?

Thanks for any help available.

 

[New Dad New Van]

That does sound like a large drop. Pump tires up to 35-40 PSI and report back over a few tanks of gas. The dealer should have used the OEM NGK platinum spark plugs. Did they do a valve adjustment?

 

[jrd123]

They did use the platinum spark plugs but I don't know if they did a valve adjustment when then did the timing belt.

Tires are all at 36-37 though.