Allmarine
Member
I have an issue with the idle on my 2013 F150 Raptor.
Symptoms:
Cold start idle is 1800rpm then after about 20 sec will drop to 1200rpm
In gear idle is about 800rpm
Deceleration sometimes the idle drops almost to stall then back to 800rpm
When hot after driving return to park and idle about 1200rpm then jumps to 1800rpm then slowly comes back to about 1200rpm
If you blip the throttle then it stays up momentarily before dropping back to about 1000rpm
The issue is not with the tune or parts as only recently occurred.
Engine:
6.6L Powerstorm, long tube headers, straight pipes, Roush supercharger, Cobra jet throttle body, 69mm pulley and JDM tune.
Diagnostics:
Technician has done a smoke test for vacuum leaks, none found though I do not know where he connected the smoke and whether it would have gotten past the blower rotors.
In gear, idle,
956 RPM
MAF 30.30 g/s
MAF 3021.00Hz
STFT 1 0.78%
STFT 2 -1.56%
O2 1 1.51%
O2 2 1.51%
Am I missing something here, I have ordered a new OEM MAF and PCV valve as they are cheap to replace. Going to do another more thorough smoke test though I have done the naughty and sprayed propane all around the intake manifold and valley of the engine and there was no change to the idle at all.
What else should I be looking at?
Symptoms:
Cold start idle is 1800rpm then after about 20 sec will drop to 1200rpm
In gear idle is about 800rpm
Deceleration sometimes the idle drops almost to stall then back to 800rpm
When hot after driving return to park and idle about 1200rpm then jumps to 1800rpm then slowly comes back to about 1200rpm
If you blip the throttle then it stays up momentarily before dropping back to about 1000rpm
The issue is not with the tune or parts as only recently occurred.
Engine:
6.6L Powerstorm, long tube headers, straight pipes, Roush supercharger, Cobra jet throttle body, 69mm pulley and JDM tune.
Diagnostics:
Technician has done a smoke test for vacuum leaks, none found though I do not know where he connected the smoke and whether it would have gotten past the blower rotors.
In gear, idle,
956 RPM
MAF 30.30 g/s
MAF 3021.00Hz
STFT 1 0.78%
STFT 2 -1.56%
O2 1 1.51%
O2 2 1.51%
Am I missing something here, I have ordered a new OEM MAF and PCV valve as they are cheap to replace. Going to do another more thorough smoke test though I have done the naughty and sprayed propane all around the intake manifold and valley of the engine and there was no change to the idle at all.
What else should I be looking at?