NO BOOST

[Rawze]

(11-03-2017 )axe Wrote:  Posting for a friend. 14 month old turbo was slobbering oil. Dripping out of hoses on turbo side. Intake side showed just a residue. He says it wasn't boosting but 10-12 lbs. @m*m^2 and boost pyro gauges. Replaced turbo, had calibrated and says it will not boost. I told him to check sensor on intake. Its 09 Pete CM 871. Any ideals. CAC was leaking, pressure tested system after replacing CAC and no leaks. Thanks in advance for any help or things to look at

As far as turbo slobber goes.... When the engine re-programming was done .. Did they ensure there was not a vacuum at idle in the intake? - Remove the IMAP sensor and feel if there is positive pressure at the hole where the sensor goes. There should be slight positive pressure. If not, then have the turbo adjusted up at idle until it is.

As far as no boost, either there is a derate, or there is a boost leak problem, or the turbo was not programmed for proper boost levels. Take your pick.

Lastly, everyone seems to claim they have MM programming these days but unless it was done by one of the well known guys on here, it may not be correct. there is no cookie cutter solution to proper re-programming a de-mandated truck.

i recomend he goes to Unilevers, gearhead, or Mr.hag if he is unsure of what he has, or can't figure it out.