Evening boys and girls, just picked up a 4 litre SE and it is idling at about 3000 revs, removed air intake and blanked it off into engine and she idles no problem, does this mean she is pulling air in from somewhere else or do I have a sensor gone, any help gratefully appreciated.
P38 High Idle
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Well, let's start the ball rolling by asking you the year, engine type, and where you are. By your spelling of litre, I assume Europe, or the colonies somewhere? Of course, you could be expat as well....basically, we need more info please.
Check all intake gaskets and vacuum lines is where I would start
Easiest way to check for an air leak is to spray carb or brake cleaner around the inlet when it’s running,
Thankyou all for responding, have ordered new plenum and valley gaskets after checking the pipework, my mate did an adaptive reset with nanocom yesterday and she idles around 625rpm now but you can still hear she is pulling air in somewhere, will change the gaskets and see how she runs then, once again thanks.
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Not sure what you mean by blanking the air intake, where did you take it off and what did you blank? It may just be that the Throttle Position Sensor idle setting is wrong in the ECU. It stores and idle position and if the stored value is lower than the actual value then it will idle very fast. Easiest way to check is to remove the two screws holding the TPS in place and rotate it slightly clockwise. If that brings the idle down to normal then it needs the adaptive values resetting. If you don't have the means to reset the adaptive values a quick fix is to enlarge the holes in the TPS so it can be rotated and left like that.
If you need to reset the adaptive values and have a elm327 bluetooth obd2 reader and android device this’ll do it
https://play.google.com/store/apps/details?id=com.flemcodesign.gems.gemsutility
https://play.google.com/store/apps/details?id=com.flemcodesign.gems.gemsutility
That's the one what fixed mine.
It looks like it is the air bag diagnostic pin on certain markets. Pin 14 is reserved for CAN-low. I don't believe this pin was reserved in 1995 when the P38 went into production. If you removed this pin either physically or with a custom extension cable then a generic OBD2 reader will likely work, or you could just remove the pins from the reader as well.
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