Question about 1990 Lexus LS 400

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My AC has not worked for a couple years now and I have taken it in to my mechanic recently and he is telling me I need a EVP valve replaced and he said he got a price from lexus for about $800.00 but i cannot find any information whatsoever on this part online, have you ever heard of it?

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I am not getting any power to my ac/heater climate unit what could be the problem?

Posted on Jul 18, 2010


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To my knowlegde there is a relay a high and low pressure switch an expansion valve a compressor evaporator and condensor in an a/c system. I have'nt heard of the evp valve. if you talking about the expansion valve it starts out for about $2.00 at the parts store. try another mechanic

Posted on Jun 22, 2010


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1 Answer

I have a flashing code of 3-4 what is it

DTC 3-4 at idle means the EVP voltage is above the closed limit.
Translation: The EVP sensor (EGR valve position) is unplugged or the wiring between it and the computer has an open. The EVP sensor has a 3-wire plug on it, and you can find the EVP on top of the EGR valve (that's the metal mushroom between the intake and a pipe coming from the driver side exhaust manifold (on a v-8)).
It's also possible that the EVP sensor is bad (open).
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Where is the expansion valve located on the 2004 KIA Sedona

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Need to no step bye step on how to replace a egr valve on a 1999 mazda protege



Before attempting to troubleshoot or repair a suspected exhaust gas recirculation (EGR) system on a vehicle, the following conditions should be checked and be within specifications.
  • Engine is mechanically sound.
  • Injection system is operating properly.
  • Mechanical-vacuum advance is properly adjusted or the electronic advance system is operating properly.
If one or more of these conditions is faulty or operating incorrectly, perform the necessary tests and services to correct the problem before servicing the EGR system.


Before attempting any tests of the EGR system, visually inspect the condition of all vacuum hoses for kinks, bends, cracks, and flexibility. Replace defective hoses as required. Check vacuum hose routing. (See the underhood decal or the manufacturer's service manual for correct routing.) Correct any misrouted hoses. If the emissions system if fitted with an exhaust-gas-recirculation valve position (EVP) sensor, the wires routed to it should also be checked.
If the EGR valve remains open at idle and low engine speed, the idle operation is rough and surging occurs at low speeds. When this problem is present, the engine may hesitate on low-speed acceleration or stall after deceleration or after a cold start. If the EGR valve does not open, engine detonation occurs. When a defect occurs in the EGR system, a diagnostic trouble code (DTC) is usually set in the powertrain control module (PCM) memory.


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