I capped off my air boost valve and the inlet on air breather. Now my idle surges from 1k to 2k rpms after i accelerate and let off gas. It will do this a couple times then settle down and not do it again until i press the gas and let off. Anyone know what is causing this? If i turn AC on it does this continously. Could this be a problem with my IACV?
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Idle surges after blocking air boost valve
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Originally posted by Jon View PostFITV, how's it?
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Originally posted by F22Chris View PostBad idle valve or vacuum leak.
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Update. If i leave the vacuum inlet open on ABV and the fans cuts on the idle starts to surge but if i immediately put my finger over open inlet the idle returns to normal immediately even with the fans running. I am thinking now it is something electrical tied into the ecm. I read something about some main relay. Which i don't even know what it does. ANyone got any ideals?
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i wonder why it does that, it is not the physics of the plenum as when i put finger on and then remove the fans are still running but it idles normal, Got to be electrical connected somehow, Maybe between the map sensor as it reads the pressure and then passes a signal on. SO the change tells the iacv to act differently. I really don't get it. AS what is the change when blocking of. I was thinking the diaphragm is cracked in abv(2 i have) and it sucks in air from outside, rather than thru a restricted vacuum. Or blocking off vacuum on air breather causes a different pressure reading and changes the readings of map sensor. AM guessing here. Does the abv somehow operate something else than i am not aware of.
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Originally posted by zedjr10 View Posti wonder why it does that, it is not the physics of the plenum as when i put finger on and then remove the fans are still running but it idles normal, Got to be electrical connected somehow, Maybe between the map sensor as it reads the pressure and then passes a signal on. SO the change tells the iacv to act differently. I really don't get it. AS what is the change when blocking of. I was thinking the diaphragm is cracked in abv(2 i have) and it sucks in air from outside, rather than thru a restricted vacuum. Or blocking off vacuum on air breather causes a different pressure reading and changes the readings of map sensor. AM guessing here. Does the abv somehow operate something else than i am not aware of.
The air boost valve is a simple device. IIRC it's open when no vacuum is applied to allow more air into the engine during starting. When vacuum is applied, it should be closed off.
You should not feel vacuum when you put your finger on the ABV nipple. If you do, there is a leak into your manifold = vacuum leak.
Main relay simply supplies power to the fuel pump, ecu, coil, and injectors. If it wasn't working, your car would not start. It's actually two relays and the fuel pump side is the one that typically dies due to a broken solder connection.
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