A/C idle issues. Need my A/C!!! - EvoXForums.com - Mitsubishi Lancer Evolution X Forums
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Evo X Performance General discussion for performance topics that are unique to the Evo X. IF THE TOPIC IS COMMON WITH OTHER LANCERS, PLEASE POST IT IN: '08+ Lancer Common.
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Old 10-30-2019, 08:08 PM   #1
MrCocoTaso
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Exclamation A/C idle issues. Need my A/C!!!

Hello, newbie here. Iíve been on the forums searching for this issue but canít find it. If there is something out there, my feelings wonít be hurt, please send link. Well here goes....when the air conditioning is off, the car purrs like a kitten, absolutely no issues! Idle is at 1000-1100. However once the a/c is running, when I come to a stop or have the car in neutral she has a very erratic idle and then shuts off. Iíve read not having heat shield for the intake could send hot air, while the a/c is running, in that area and throw the MAF for loops. So I bought a MAP Rev 2 heat shield to aid in this issue. Installed it, took it out for a drive and the EXACT same thing is happening again! Again if there is a link please send.

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Old 11-03-2019, 07:21 PM   #2
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Would re-learning idle help or not. Anyone?
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Old 11-05-2019, 12:18 AM   #3
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Originally Posted by MrCocoTaso View Post
Would re-learning idle help or not. Anyone?
Check for vacuum leaks maybe boost leaks, clean the MAF.
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Old 11-05-2019, 09:50 AM   #4
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Originally Posted by Quadrider10 View Post
Check for vacuum leaks maybe boost leaks, clean the MAF.
+1
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Old 11-05-2019, 01:12 PM   #5
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Quote:
Originally Posted by MrCocoTaso View Post
Idle is at 1000-1100
Stock idle is in the 700-800 range. I'm going to strongly suspect a vacuum leak somewhere past the throttle body. Did you do any work before it started? The car will still run halfway decently with a vacuum line disconnected but will do funky things under light load (like the AC coming on or tip-in light throttle)
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Old 11-06-2019, 12:52 AM   #6
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Thanks. I’ll get on this.
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Old 11-07-2019, 05:28 AM   #7
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Update...Checked the lines and found only these two (or one) not connected. Did a compression check, nothing less than 162 on all 4. Havenít done the throttle body clean yet. Being methodical is ok with me not in a big rush.
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Old 11-07-2019, 05:34 AM   #8
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Oh sorry I did clean the MAF.
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Old 11-07-2019, 05:37 AM   #9
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Same outcome.
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Old 11-08-2019, 04:30 PM   #10
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Check the fuel pressure regulator hose to see if it came off. It's under the engine cover on the left.
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