Fuel Cut

[plattnnum]

I have a 1g with a 14b. When I hit about 10 psi I'm hitting a brick wall, not all the time but sometimes. Possible boost leak? On a side note my car is vibrating in low gears...does it need new oil in the transfer cases?
Thanks!

 

[92AWDHX40]

Well first check for leaks with a blt, check transfer case oil may be low fill just to make sure. Do a blt to rule out the leaks.

 

[TalonBoi91]

Fuel cut, you ecu's calculated airflow goes over a set value. Not sure exactly what the set valve is exactly. But at 10 psi you shouldn't be hitting fuel cut. What are your mods?

 

[jed344]

The brick wall comment sounds like fuel cut but at 10psi that seems odd. I would start with boost leak test.

 

[iBoostDSM]

Most likely a boost leak. It will letting unmetered air in the motor.

 

[curt-s]

Under boost (which is what he's talking about), post-turbo can't let air in because the entire intake system is pressurized.

Pre-turbo, it can let air in, but you wouldn't be able to do a boost leak test.

Boost leak would cause you to run rich and kill performance, also possibly rich knock. You may also be getting PK up there if something is vibrating at the right frequency.

Injectors could be dog old and unable to cope.

Plugs.

Coil or transistor; on their way out, bad wiring/connectors.

Checked the MAS recently? Maybe the sensor(s) in it can't read right anymore or bugger out at a higher airflow number.

What HAVE you checked?

 

[SlickRicky13]

If it was a big boost leak it could hit fuel cut. Dose it blow black smoke under acceleration?

 

[TalonBoi91]

Black smoke is unburnt fuel i believe, means running to rich.