UK Car Repair Questions? Ask a Mechanic for Answers ASAP
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If you have a hissing sound near or at the PCV itself check for any vacuum leaks on the engine that need to be repaired.I have seen issues with a vacuum leak that can cause the engine to computer to try and compensate for it and cause an issue like this here.If the leak was already found and repaired let me know.
If the check engine light has come on with this fault here the fault codes need checked using a scan tool that will plug in and communicate with all computers to see what codes are set.Once this is done any codes set will need diagnosed and repaired to correct this issue.
One common component I have seen cause an issue like this here is the crank position sensor itself.If it is losing its signal intermittently the fault here will occur like this and can be a brief stall out issue.If this has not been replaced this may be the cause needing replaced.
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Looking at the info on this model here your vehicle doesnt use a steering position sensor instead it has a steering control valve in the power steering pump itself.This valve can stick due to being dirty needing cleaned or needing replaced and can cause low or excess power steering pressure in return causing an extra load on the engine which can cause the idle drop and stall out issue here.I have seen this valve fail needing cleaned or replaced before for a fault similar to this here.If this has not been checked into this needs done.
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This is located on the power steering pump itself where the pressure line threads into it.It should be the part that the line threads into.Once the line is removed it can be removed.Below is a picture of the pump itself being removed from the engine.You may not have to remove the pump if you can access it without removing the pump.
Even if the check engine light isnt coming on I would still have the codes checked to see what codes are set.This needs done with a scan tool that will plug into your vehicle and can read all computers to see if any codes are set in any of the computers.In some cases codes can set but not turn on a light to let you know and a code set will help locate if this is the cause for sure here.
With there being no steering sensor and with what you have occuring here this sounds like the cause here.There is a chance this is the engine computer itself at fault needing replaced instead but I would check and clean this valve to see if this resolves the fault here first.
Sounds good.Let me know if you need anything else.
Usually the pump may need removed somewhat to access this here.In some cases you can remove the power steering pump pulley to better access any bolts or this line/fitting to then remove it and clean or replace it.This will require a power steering pump pulley puller and installer which in allot of cases you can rent from a local parts store.
O.k.,with this new description you have here one of the biggest causes for this fault is carbon build up in the throttle body bore.The bore and bore plate will develop carbon on them and then when you release the throttle when the throttle plate closes it stays open just a slight amount to allow air in for proper idle or decel speeds.When there is a slight amount of carbon build up in the bore this causes a slight restriction with this air flow coming into the engine.
If you have not cleaned the throttle body bore and bore plate this needs done.Use a shop rag with some carburetor cleaner or brake cleaner sprayed on it to then wipe out the throttle body bore and bore plate.When this is done then turn on the key for 1 minute then off for one minute then on again for one minute then off then start the engine and let idle for a minute and then turn off for a minute then restart and see if it operates properly then.
No problem.I hope you get well soon.Reply when your ready and there is no hurry.