2012 KW W900

[Rawze]

a person can't really clean the Delta-p effectively, and it read correctly after. Simply replace it.


Lower than normal boost can be a lot of different things. It can be an Air related issue ... or it can be a fuel related issue.

* Plugged up air filter.
* Leaking CAC or bad clamp on a pipe somewhere.
* CAC boot that is partially collapsing internally.
* After-market CAC unit that is too restrictive.
* Bad or mis-reading boost (or IMAP) sensor.
* Bad or mis-reading Exhaust pressure sensor or a block-up pipe that feeds it.
* Plugged up exhaust pipe or exhaust filter element..
* Exhaust manifold leaks.
* EGR circuit leaks.
* damage to the turbo, usually exhaust turbine damage or a carbonized bearing.
* improper calibration of, or a failing turbo actuator controller.
* A Slipped cam or improperly adjusted overhead valves.
* It can also be any one or more of several fuel related problems where the engine gets less fuel than normal.

-> New Air filter.

-> Replace ALL old CAC boots. Remove, inspect for cuts on the inside walls of any that are not replaced.

-> Ensure the CAC is not an after-market unit.

-> Pressurize the intake up to 30 psi and check everything for leaks. No more than 10 psi leak rate in 60 seconds is allowed.

-> Rlacing the IMAP or boost sensor with a new one.

-> Replacing the Exhaust gas pressure sensor with new one and ensuring its feed-line is not clogged up. The feed lines for this sensor is notorious for clogging up, where it goes thru the thermostat housing.

-> (check for exhaust restrictions). Remove the exhaust piping behind the turbo and take it on a short test run to see of some power increases or boost comes up.

-> Perform a thorough turbo inspection. Ensure there is no VGT vanes or exhaust impeller damage, makae sure it is not hanging up. Sometimes VG will only hang up when hot. Make sure turbo is all OEM and not something half-arssed from a rebuild shop.

After that, if all is good ... Monitor the engine with Calterm and see what the engine is actually doing. How much fuel it is giving it, how much boost it is getting, what engine mode it is in, what is in control of the fuelling, etc.etc.etc.

here are some screens that someone can make for themselves to see what is going on...
for a CM870: http://rawze.com/forums/showthread.php?t...3#pid58693

for a newer engine: http://rawze.com/forums/showthread.php?t...6#pid28636

Tags:

low boost, low power, lower than normal boost, isx boost, boost problems, power issues