Gaz142
Well-Known Member
- Joined
- Oct 19, 2021
- Threads
- 12
- Messages
- 45
- Reaction score
- 8
- Location
- Saudi Arabia
- Vehicle(s)
- Mustang 2018 GT
- Thread starter
- #1
Car runs super smooth and drives super nice however, it idles really bad. RPM drop from 700 to 300 and goes back to 700 on random intervals. It happens on a stop and when the AC is on and rarely if ever happens when ac is off but it doesn't idle good either. I really have no idea how to fix this, below is things I tried so far.
- Cleaned throttle body
- Cleaned IAC valve
- Cleaned MAF sensor
- Added fuel additive to clean fuel system and fuel injectors
**There are no codes and nothing stored in the memory**
Nothing change and no improvement what so ever. I read somewhere in this forum that this commonly happen when the VCT solenoid gets debris or need cleaning however dealership has to clean it on request or just change oil and it will flush it too. Any suggestions on what to do next ? I might do oil change however I only drove 1,500KM since last oil change which was around month/2months ago. I'm also wondering what is the connection between AC load on engine and VCT solenoid ? Things to note that weather here is 48 to 50 Degrees Celsius.
Car is:
- 10r80
- has double X-pipe
- HP catless tune
- Catalytic converter delete
- Car has 96,333KM and it is 2018 GT
any support is welcomed
-----------------------
UPDATE: Symptoms only occur when car AC is running. Today car started to have a humming sound (hum, hum, hummm) then few seconds and repeat and it seem in rhythm when AC is on and the sound is only audible if you listen closely inside the cabin. All idling issue happen when AC is on and I drove for 45min and idling for 15mins with AC off and no issues what so ever and smooth idle, the moment I started AC idling became rough. Any thoughts of what could cause it ? bad compressor ? potential AC leak ? low freon ?
- Cleaned throttle body
- Cleaned IAC valve
- Cleaned MAF sensor
- Added fuel additive to clean fuel system and fuel injectors
**There are no codes and nothing stored in the memory**
Nothing change and no improvement what so ever. I read somewhere in this forum that this commonly happen when the VCT solenoid gets debris or need cleaning however dealership has to clean it on request or just change oil and it will flush it too. Any suggestions on what to do next ? I might do oil change however I only drove 1,500KM since last oil change which was around month/2months ago. I'm also wondering what is the connection between AC load on engine and VCT solenoid ? Things to note that weather here is 48 to 50 Degrees Celsius.
Car is:
- 10r80
- has double X-pipe
- HP catless tune
- Catalytic converter delete
- Car has 96,333KM and it is 2018 GT
any support is welcomed
-----------------------
UPDATE: Symptoms only occur when car AC is running. Today car started to have a humming sound (hum, hum, hummm) then few seconds and repeat and it seem in rhythm when AC is on and the sound is only audible if you listen closely inside the cabin. All idling issue happen when AC is on and I drove for 45min and idling for 15mins with AC off and no issues what so ever and smooth idle, the moment I started AC idling became rough. Any thoughts of what could cause it ? bad compressor ? potential AC leak ? low freon ?
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