Iac and pvc delete pros and cons - Ford Mustang Forum
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post #1 of 6 (permalink) Old 5 Days Ago Thread Starter
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Iac and pvc delete pros and cons

My iac has an issue with running my car at 1500 rpm at idle so i have been thinking about deleting it. I have tuning software so it wont be an issue. But what are the pros and cons to deleting it. Also what is the pros and cons to deleting the pvc and fresh air system and adding breathers. Thank you

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post #2 of 6 (permalink) Old 5 Days Ago
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Well, nothing but cons all the way around...let's start with the pcv valve...this keeps/balances pressure in the upper and lower half of the engine..... deleting it will push oil where you don't want it and induce water vaper within the engine....eliminating the IAC? You have a software program so no big deal...really? I don't think so.

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post #3 of 6 (permalink) Old 5 Days Ago
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Do you have a/c in your car? If you do, your idle will end up being higher than you want it when the a/c isn’t on. I’ve got a few buddies that have deleted iac’s and the car runs fine but they are cars that don’t have a/c.

As far as pcv is concerned, that’s also something that people do quite often and have not seen many negative effects. Most folks will do an air-oil separator instead of just a breather. Run both covers into a baffled container and then run the catch can out to the intake. That way the system is close to working like it used too.

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post #4 of 6 (permalink) Old 4 Days Ago
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If you delete the IAC you can expect that after tuning on a hot motor it will run fine. That is until:
  • The weather changes
  • the motor is cold. No high speed idle when the motor first starts.
  • the baro presure changes
  • the fuel changes from winter to summer grade (or the other way)
  • The AC is switched on (or off).
  • the motor load changes for example power steering load during slow speed operation.
  • For the GT, not enough RPM's for the power steering pump to supply power brake assist during coast down.

To me the biggest "con" of all is the act of "giving up" on a possible "solvable" problem.
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Last edited by wmburns; 3 Days Ago at 03:41 PM.
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post #5 of 6 (permalink) Old 4 Days Ago
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Hmm, I always thought the IAC was necessary:

https://wheelzine.com/understanding-...n-your-vehicle

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post #6 of 6 (permalink) Old 4 Days Ago Thread Starter
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Quote:
Originally Posted by lwarrior1016 View Post
Do you have a/c in your car? If you do, your idle will end up being higher than you want it when the a/c isn’t on. I’ve got a few buddies that have deleted iac’s and the car runs fine but they are cars that don’t have a/c.

As far as pcv is concerned, that’s also something that people do quite often and have not seen many negative effects. Most folks will do an air-oil separator instead of just a breather. Run both covers into a baffled container and then run the catch can out to the intake. That way the system is close to working like it used too.
ac has been deleted but is a daily. Right now the iac is unplugged and i set the idle myself anyway due to my cams. Im just trying to clean the engine bay up a bit thats all.
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