Question about 1994 Lexus Es 300

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Head gasket is there any sensors that i need to know about before changing the head gasket

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  • yadayada
    yadayada May 11, 2010

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Sometimes when you reassemble heads the knock sensors will set a code. it best to replace both sensors and short harness while your there. they set in the valley of engine block.

Posted on May 21, 2009

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Posted on Jan 02, 2017

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How do u know when a heads is bad or just the gasket needs changing on a 97 Expedition?


to check a head or gasket have a compression test done
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what you are stating indicates excessive fuel consumption and running very rich
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I have A 1986 Nissan sentra that has been giving me problems starting. I've changed the wires,plugs, roter cap and button, had A bad catilitic converter removed it and am still hardly starting and when...


Can not use a vehicle without a converter

You have no fuel control, without it

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Sounds like you have zero vehicle experience
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Head Gasket a possible

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My grand am still overheats even after i changed the termostat and water pump plus, the fan only runs when the temp sensor is unplugged


I had the same problem with my 1999 grand am .I changed water pump, thermostat. I heard the Pontiac engines , 3.4 had overheating problems one is the intake gasket if your losing water but don't know were its going its leaking at the intake gasket and burning off or if you check the oil cap or the dip stick and theres a milky substance on them it would be your head gasket I had to change my head gasket and while I was there I changed the intake gasket too. I haven't had any problems sence I changed them hope this helps. Jack

Jun 11, 2014 | 1997 Pontiac Grand Am

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Changed head gasket, now won't start.


I would need to know the actual code numbers to comment, but in general those components would not keep the engine from starting.
Have you checked compression, spark and fuel pressure ?

Jun 09, 2013 | 2001 Chevrolet Cavalier

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1999 volvo s70 overheating


Yes this has happened to me. The coolant temperature sensor tells the radiator fan when to turn on to cool the radiator. When this sensor is faulty your vehicle is overheating and it can cause a blown head gasket if not replaced. I hope this was helpful.

Feb 03, 2009 | 2000 Volvo S70

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