Change spark plugs on Lexus ES 250

Hi, Most of the time you can follow the UPPER radiator hose to the engine and there will be the thermostat housing. On Reverse Flow cooling systems you follow the LOWER radiator hose. All the thermostat does is trap coolant in the engine until it reaches a certain temperature, then opens to the radiator to be cooled. Don't forget to bleed the air from the highest place in the cooling system. Sometimes that's the reservoir, but look for a small plug high on engine. Good luck

It can be faulty or dirty spark plug itselfd.Also for reference get the fuel level checked.Is the fuel tank is empty or near to empty.
Try cleaning the spark plugs and then see if that is helpin.On some cases the black carbon layer gets collected on the spark plugs and that causes the problem,so cleaning the plugs help.But if its not helping,then spark plug has to be replaced.Spark plugs get power from ignition coil to ignite sparks.If ignitioncoils are faulty then also there will no spark.--------------

To troubleshot and confirm the issue,i suggest you to go through the help links provided below,check the procedure and it will help you to confirm the issue in your case.
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Click the link below:------

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http://howtobyme.blogspot.com/2011/12/car-crankshas-spark-but-will-not-start.html

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http://schematicsdiagram.blogspot.com/2011/06/spark-plug-firing-order-for-car.html

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How to Replace Spark Plugs?

http://schematicsdiagram.blogspot.com/2011/07/how-to-replace-spark-plugs.html

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How to Perform a Basic Engine Tune Up-Spark Plug and Wire Change

http://schematicsdiagram.blogspot.com/2011/08/how-to-perform-basic-engine-tune-up_01.html

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http://schematicsdiagram.blogspot.com/2011/06/car-has-no-spark.html

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http://schematicsdiagram.blogspot.com/2011/12/how-does-spark-plug-wires-go-on.html

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http://schematicsdiagram.blogspot.in/2012/04/no-spark-on-2008-chevy-avalanche.html

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http://schematicsdiagram.blogspot.com/2011/12/how-does-spark-plug-wire-go-on.html

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http://whoisbyme.blogspot.in/2012/06/ford-plug-wires-not-coming-out.html

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http://schematicsdiagram.blogspot.com/2011/12/ford-explorer-has-no-spark.html

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Chevy impala spark plug firing order diagrams?

http://technoanswers.blogspot.in/2012/02/chevy-impala-spark-plug-firing-order.html

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How to gap spark plug on Chevy Impala?

http://technoanswers.blogspot.in/2012/02/how-to-gap-spark-plug-on-chevy-impala.html

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http://technoanswers.blogspot.in/2012/02/spark-plug-replacing-for-chevy-impala.html

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http://howtobyme.blogspot.com/2011/12/chevy-s-10-blazer-43l-spark-plug-firing.html

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http://schematicsdiagram.blogspot.com/2011/12/1982-dodge-rampage-spark-plug-firing.html

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http://schematicsdiagram.blogspot.com/2011/12/2006-suzuki-forenza-spark-plug-firing.html

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1983 Ford Ranger Spark plug firing order?

http://schematicsdiagram.blogspot.com/2011/12/1983-ford-ranger-spark-plug-firing.html

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Firing Order for 1991 Lexus ES 250?

http://schematicsdiagram.blogspot.com/2011/12/firing-order-for-1991-lexus-es-250.html

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Firing order for 1992 Chevrolet 5.0 engine?

http://schematicsdiagram.blogspot.com/2011/12/firing-order-for-1992-chevrolet-50.html

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How to identify number one spark plug on the distributor cap?

http://schematicsdiagram.blogspot.com/2011/12/how-to-identify-number-one-spark-plug.html

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How to remove rear spark plugs on 1991 Buick Regal?

http://howtobyme.blogspot.in/2012/02/how-to-remove-rear-spark-plugs-on-1991.html

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These details will help.

Thanks.

when you are saying no spark do you mean no spark coming out from distributor to spark plugs,coils,or no spark at all. Check coils,wiring connectors.

use longer spark plug socket should reach down to spark plugs.

the thermostat is usually in the housing where the top radiator hose connects onto the engine.....chers.

need to change out your throttle control module.

You should just need a extention to get at the plugs and a plug wire puller and you should be good no need to disacemble

You need to check timing belt. could have broke belt.Also you should look at water pump if you replace belt.It is driven by the t-belt.

under upper intake(plenium) on rear of motor. very tight fit.

I need to change spark plugs on lexus sc 300 1992