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2004 Scion xA Question: 170,000 miles. Engine starting to make a noise. Am told it is the Variable valve

 

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NobleJ, Freehold, NJ, June 01, 2012, 11:50
 Rookie

Timing Actuoator. What is this all about?

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  • Answer #1

    July 12, 2012, 13:55
     Master

    It a hydraulically operated cam gear that advances or retards timing based on various inputs from other sensors.It's to maximize both power,fuel economy and emissions.(most people just like it for the boost in performance , hey!. why not? When not operating properly it can make a very harsh rattle on start-up 1-2 seconds in some cases.May also cause the check engine light to come on if the duration of the faulty cam timing readings last long enough for the PCM to detect.

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    NobleJ, July 12, 2012, 18:58
     Rookie

    What is the average cost to replace it?
    Is it necessary to replace?
    Will it cause further damage if not replaced?

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    ziptie12, July 12, 2012, 20:52
     Master

    as far as cost, you'll have to check locally or use the repairpal app for estimate.It is necessary for proper engine performance and will slowly do damage to your emissions system most likely.

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