Ijust did the spark plugs and believe me the front ones are piece of cake, but the rear ones, let me tell you, if you know about mechanics, go for it. There is alot of stuff to remove, including the intake plenum, and those spark plug wires casing that is another story. My best advise is if you have a couple of hundred dollars, that is your best choice. As far as the timing belt goes, pay a car shop, there is probably twice or three times more work involved than changing the spark plugs. siennas were designed to be worked on once or twice every five years (major work of course).
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first why and how did you tighten the timing belt. if was loose should just replace the timing belt that belt runs the timing.the code po335 is your crank position sensor and it is coming up the engine is fight to keep the timing. replace the timing belt. the codes po300,po302.po303 are for a rarandom misfire. when was the last tune up. change the sparks plugs
I parked my 04 sienna and cut it off 2 hrs latter I tried to start it and would not crank starter was fried replaced with new one now it crank but will not start I tried starting fluid same thing cecked fire to plugs fire once and quit until you turn key agin fire once agin replaced cam and crank senser no start what am I missing anyone thank ,lost..
Usually when you change the plugs that you also should change the distributor cap and rotor as well. When you changed the plugs with hopefully with the Alero specifications type manufacturer spark plugs that you have to also change the timing belt too is why your idling is low. All spark plugs have a gap in them so your car special plugs should too. You might have the wrong spark plugs with the wrong gap in them so you can ask autozone for the gap specs for your year, make and model plus you can buy the right spark plugs there too. The spark gap will change the timing of car depends on the gap.
90000 km service includes changing.spark plugs,oil and oil filter,gearbox fluid,brake fluid ,air filter and fuel filter if needed,a full safty inspection.and the most important timing belt,and while your doing the timing belt you should do the water pump.
You change One spark plug, and One wire at a time. Do you know where your timing belt is? If not, its on either the right or left side of the engine. There is a covor to the timing belt. You take the First plug that is closest to that belt. Then you work your way to the next closest all the way to the last one. Remember, you have to do ONE at a time.