Hi everyone,
First of all sorry for the bad grammar , I speak french i am from Montréal , Canada.
I've been chasing a bad hesitation with my 2005 mustang gt since LAST SUMMER.I just found out what was the cause of it. If i can help someone with this so you don't have to loose your mind like me i will be more that pleased.
Nothing more simple than a good old vacuum leak...
I knew i had a vacuum leak somewhere but i could not find it because it was no where near the intake.
If you have a procharger with the Proflow bypass valve ( the black one ) PLEASE make a smoke test on it.
The diaphragm Inside of it can go bad and create a really bad leak.
The symptoms were :
LTFT were going high at idle
Intake back fire at low load , low rpm.
weird shifts points.
If you have any of these symptoms and don't know what it is. Make sure to check for vacuum leaks.
First of all sorry for the bad grammar , I speak french i am from Montréal , Canada.
I've been chasing a bad hesitation with my 2005 mustang gt since LAST SUMMER.I just found out what was the cause of it. If i can help someone with this so you don't have to loose your mind like me i will be more that pleased.
Nothing more simple than a good old vacuum leak...
I knew i had a vacuum leak somewhere but i could not find it because it was no where near the intake.
If you have a procharger with the Proflow bypass valve ( the black one ) PLEASE make a smoke test on it.
The diaphragm Inside of it can go bad and create a really bad leak.
The symptoms were :
LTFT were going high at idle
Intake back fire at low load , low rpm.
weird shifts points.
If you have any of these symptoms and don't know what it is. Make sure to check for vacuum leaks.
