OK folks... I have solved the hissing sound, but the hiccup still persists. Here is the summary:
From full stop, hard acceleration in any drive mode results in hiccup... this happens AFTER engine reaches operating temperature. It does not do this if cold start and before reaching 160F. This leads me to suspect the PCV Solenoid hose is not working correctly since the PCV solenoid activates only after reaching operating temperature and not otherwise. This hose/solenoid comes out from the firewall and connects directly to the throttle body and the RB external low side catch can hose connects perpendicular to this hose at the mouth of the throttle body.
This is what has been done so far:
1. Replaced all hoses and connections, clamps and couplers to all possible hose connection points on every engine and turbo part.
2. Replaced with brand new throttle body.
3. Cleaned all PCV valve adapters.
4. Replaced crankcase sensor.
5. Ran Fuel Cleaner for e85 tank.
6. Reset all adaptations in MHD
7. Battery is 100% level, all connections checked and tightened front and rear.
8. spark plugs new.
9. spark plug wires, new.
10. replace both camshaft sensors.
This is what will be done next:
1. replace PCV hose/solenoid
2. check transmission fluid level.
This problem manifests in any drive mode and regardless of traction control on/off state.
Again...only after operating temperatures are reach does it begin to hiccup and only hard acceleration from full stop.
It does not hiccup AFTER going into motion no matter how hard I slam on the pedal.
It does not hiccup from full stop IF I feather the pedal conservatively and ease into motion.
The engine feels and sound super strong, stable, smoother in idle, in park, or in drive with the brakes depressed, or in reverse with brakes depressed, and after it is in motion and under WOT. When in motion, throttle response is predictable and stable... only from a dead stop after operating temps reached does it hesitate under hard pedal press.
The last option is contacting my tuner to check the tune and logs.
Any ideas welcomed.
From full stop, hard acceleration in any drive mode results in hiccup... this happens AFTER engine reaches operating temperature. It does not do this if cold start and before reaching 160F. This leads me to suspect the PCV Solenoid hose is not working correctly since the PCV solenoid activates only after reaching operating temperature and not otherwise. This hose/solenoid comes out from the firewall and connects directly to the throttle body and the RB external low side catch can hose connects perpendicular to this hose at the mouth of the throttle body.
This is what has been done so far:
1. Replaced all hoses and connections, clamps and couplers to all possible hose connection points on every engine and turbo part.
2. Replaced with brand new throttle body.
3. Cleaned all PCV valve adapters.
4. Replaced crankcase sensor.
5. Ran Fuel Cleaner for e85 tank.
6. Reset all adaptations in MHD
7. Battery is 100% level, all connections checked and tightened front and rear.
8. spark plugs new.
9. spark plug wires, new.
10. replace both camshaft sensors.
This is what will be done next:
1. replace PCV hose/solenoid
2. check transmission fluid level.
This problem manifests in any drive mode and regardless of traction control on/off state.
Again...only after operating temperatures are reach does it begin to hiccup and only hard acceleration from full stop.
It does not hiccup AFTER going into motion no matter how hard I slam on the pedal.
It does not hiccup from full stop IF I feather the pedal conservatively and ease into motion.
The engine feels and sound super strong, stable, smoother in idle, in park, or in drive with the brakes depressed, or in reverse with brakes depressed, and after it is in motion and under WOT. When in motion, throttle response is predictable and stable... only from a dead stop after operating temps reached does it hesitate under hard pedal press.
The last option is contacting my tuner to check the tune and logs.
Any ideas welcomed.
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