Question about Lexus RX 300

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The engine suddenly started running rough, added fuel injector cleaner, ran that through for ~10 miles and then refilled tank with high octane fuel, still rough, exhaust smells strong like rotten egg, and the exhaust seems much hotter than normal. Also the check engine light is flashing, my code reader does not work on this vehicle so don't know what code it's indicating. Do you think it's an O2 sensor, MAP sensor or spark plugs? Car has over 200,000 miles ran fine until now.

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  • rlmason Apr 14, 2010

    Found it was the Oil Control Valve on the Variable Valve Timing, bank 1 (Front bank) easily replaced (one connector, one bolt) however, you must go to the dealer to obtain replacement - cost was ~$90.00.

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CHECK YOU'RE catilactic converter

Posted on Feb 03, 2010

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Car is running very rough after it was run out of gas. Suspect it has to do with injectors after adding fuel. Help please.


Often times the lower octane fuels have some sedement that settles at the bottom of your tank. So when you run out the gas often times these sedenments work there way through the fuel system. Try and fill up with a high octane (91 or higher) and add a fuel conditioner and drive it. This will sometimes burn off the sedement and help to unclog injectors. If this doesn't work then you may need to replace your fuel filters because they may be clogged.

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Put more than 3 gallons of gas in your tank- $20 = 3.5 gallons here. The bottle of cleaner specifies how many gallons of fuel is to be mixed with the cleaner. Usually 8-10 gallons for the small bottle cleaners. Whatever. Follow the directions. It will likely run like garbage for about a quarter tanks worth, but should clear up eventually, UNLESS - there was something wrong before you put the cleaner in. Have you put cleaner in before now? If not, why did you decide to do it now? If there was an issue before, that issue needs to be cleared up before trying additives, unless you are absolutey sure you have a dirty injector or two. Also might help to buy the highest octane rated gas you can for a tank or two. The more expensive brands (Shell, Exxon, Mobil, etc.) usually have some detergents in their gasolines that help clean injectors on their own too.

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Even a small amount of bad gas can cause your problem.
So the first thing you need to do is remove your fuel tank so you can drain all of the old fuel out,then remove the fuel sending unit and fuel pump assembly thats in your fuel tank and clean the filter screen, after that you can reinstall the fuel tank,replace your fuel filter and I would have a fuel injector sevice done.
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