Question about Toyota Previa

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Hello there i recently got my head gasket replaced on my 91 toyo previa, prior 2 doing this repair i was getting 17 mpg, after this repair im getting 12 mpg, i took it 2 a mechanic hu told me the timing was set at 25 i believe that means degrees it suppose 2 b at 5 degrees, if he was 2 do that the car wld start shaking & shut off, so he left it higher now im hearing the rattling in the engine, & the check engine light is on.... he said in order 2 adjust it correctly the timing belt needs 2b adjusted by a few points or degrees, i called my friend hu did the head job & he stated that he left the timing belt exactly the way it was b4, i will mention that this is the 2nd time that this van gets the head gasket replaced, my friend said that, this was the reason the timing is off i dont buy it, he then said he needed the camshaft timing specs 2 adjust it correctly,can u tell me wat it is? or will this solve the problem? im now getting 100 miles per tank, im blowing through gas like a v8? plz help

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  • cquint Apr 24, 2010

    i no that i can go 2 the bbb, the mechanic is willing 2 fix it, in order 2 speed up the process i need te camshaft timing specs? how can i get it

  • cquint Apr 24, 2010

    ok so is it the camshaft timing thats off then? is this wat the problem is? now can u guide me 2 where i can get the camshaft timing specs? & my friend did say he marked it, as i stated he did say that he left the timing exactly the way it was b4 the gasket blew, right now im trying 2 find online the camshaft timing specs, he was willing 2 open it up & adjust it i just need the specs on it

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  • Master
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Hi!!

I think your friend messed up on installation, there is only one way to install the timing chain, the right way.

Your timing should be at 5 degrees BTDC. In order to achieve this, the timing belt should be installed correctly.

click the link below to find step by step instruccions and diagrams on how to remove and install the timing chain in your vehicle.

http://www.autozone.com/autozone/repairinfo/repairguide/repairGuideContent.jsp?chapterTitle=Engine+Mechanical&partName=Engine+%26+Engine+Overhaul&pageId=0900c1528008a099&subChapterTitle=Timing+Chain+And+Gears&partId=0900c1528008a01e

Give it to your friend, hopefull he'll get it right this time. Good Luck!!!!

Posted on Apr 24, 2010

  • Rene J Solis Apr 25, 2010

    Like I said before, it does not matter if the timing was right or off before, If you follow the instruccions that you'll find all the info to install timing chain properly.

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  • Toyota Master
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Find a better shop that does better repairs and have it corrected correctly. I am sure your friend meant well but not setting up the timing marks before and after assembly can do more than jack up your timing. Exhaust and egr piping on the Previas are very prone to buildup and clogging so if that wasnt done while head was off no telling what he knocked loose.

Posted on Apr 24, 2010

  • Jason Johnson Apr 25, 2010

    If a friend did the head gasket repair the BBB will not go after the garage. The garage is not liable for work done by another repair man so be careful.

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Call the Better Business Buerea on this guy. He did not set the cam correctly so he timed your engine to run the best way he could. If you have it set correctly and is does not run as it should this guy scammed you. Have all documents you retained from this engine work you paid for and log in to the bbb.org to file a complaint

Posted on Apr 24, 2010

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