Had car service a local Toyota dealer, replaced plugs, when I start car the engine would race and the gas milage dropped 5 mile in town and on the road. Took back to dealer, told me everthing was okay.
Then I took car to an independent repair man. Told me wrong plugs. I want to know what Toyota vehicle the following plugs fit that I can can tell them they made a mistake if any. The No, Denso K16 TR11.
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They are in the engine valve cover, each plug has its own ignition coil on the top of it, no plug wires, you must unbolt the 4 coils and remove them from the top of the spark plugs and see them aside, then use a 5/8" deep spark plug socket to remove them. Below is a picture of one of the 4 ignition coils.
smells to a wrong spark plug type, double check your numbers, if doubt call your locall toyota dealer parts department. Toyota vehicles are very sentimental about originall equipment plugs, dont like aftermarket plugs, also check your air filter housing and make shure all hoses are atached.
You have to take off the plastic that covers the engine, right under that you'll see the spark plug wires going along under the plastic peice. You wont see the plugs, they're way down about 5 or so inches in your block. These new cars like to hide the simple stuff these days, so be sure you have a long extention on your rachet, and don't forget to be sure you've got a gromitt or else you might never get the plug out. Also, only get the plugs for YOUR car. Other plugs and end up burning up your engine by getting them too hot. If you have any questions, call your local Toyota Dealer
changes on idle can be for multiple reasons, including type off gas related to climate or temperature, winter blend in summer or vise versa, if your engine is burning some oil wich all 1.8 do, then have them inspect and replace has needed, also your air mass flow sensor collects dirt over time specially if you run an aftermarket air filter, clean it , all of this if no check eng lite on, other wise refer to codes first.
sorry but if you think the plugs are wrong then you are a sunday mechanic and this sort of problem if its electrical will be above your head,check colour of spark plugs and if blackish clean out the air filter,are the brakes binding ??if not and the air filter is clean then run car into local garage,could be anything from low compression caused by worn valve seats to broken piston rings
When was the last time it was tuned up? Since you did not mention any "check Engine" light coming on, I assume that it is off. What I would do is check the plugs, replace them if worn, replace the plug wires if they are older than 5 years; check/replace the air filter. Not much else to do/check until you have the engine in a good state of tune; BTW, if you change the plugs, get the new ones at a Toyota dealer. I have a Camry V6, and when I put non-Toyota plugs in it, it ran worse. Toyota platinums made a 100% difference.