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A collection of helpful articles based on reader submissions
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Below is a collection of Jim Grant's Tech Tips sorted by Vehicle Make. These Tech Tips were answers to questions submitted to Jim by ALLDATAdiy.com users over the course of many years.
If you have any questions, please feel free to email us.
 
 

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  Jim Grant's Tech Tips

'91 Toyota Corolla, Pressure Control Valve Question

Q: I own a ’91 Toyota Corolla with a 1.6 16-valve engine. Can you please help me in locating my Pressure Control Valve (PCV) or Pressure Valve Control (PVC) sorry I’m not very sure on what to call it? If you can provide some illustrations and pictures it will be a big help.

- Ronald L.

A: What I believe you’re looking for is called the Positive Crankcase Ventilation (PCV) valve. Did you know that there were 2, 16-valve engines for your vehicle? Depending on which engine your Corolla has makes a world of difference. The standard model Corolla was equipped with a 1.6 liter 16-valve engine ID of 4AFE. The PCV valve for this engine should be easily found on the center rear of the valve cover. In the event your Corolla is equipped with a 1.6 liter 16-valve 4A-GE engine then you’ll go crazy trying to find the PCV valve. Why is that? That model engine doesn’t have a replaceable valve; it is a fixed orifice that just needs to be cleaned. So if you’re standing in front of your vehicle with the hood up looking for some place to put that PCV valve you have to ask yourself, just which engine is in your Corolla?

 
     
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