11-20-2018 04:59 PM - edited 11-20-2018 05:03 PM
if the air inlet has no restrictions and the turbo boost is abnormal, make sure your turbo is really working under load and also make sure your exhaust system has no restriction that prevent the turbo from turning fast enough to produce proper boost.
an engine with a bad turbo or experience an exhaust restriction is more likely to develop symptoms under load but will barely shows any symptoms on idle.
11-20-2018 09:11 AM
Inlet Air Restriction,Exhaust Restriction and/or High Altitude
Reduced Flow of Inlet Air through the Aftercooler
Most likely the problem is not the aftercooler itself but it should be throughly inspected too.
Replace your air filters, so that will eliminate any possible restriction there and check all of the above.
Cold air is denser than hot air, does the engine overheats?
11-20-2018 07:55 AM
11-19-2018 11:39 PM
If the hose from the air cooler to the air intake on the engine was being sucked flat when the engine stalls and also stalls with hose from turbo to air cooler off this indicates a restriction within the aftercooler itself. Why the engine runs ok under load at speed but then stalls when load and speed are reduced is unusual. Suggest you either measure the pressure drop across the aftercooler to confirm problem or just replace it.
11-19-2018 11:17 PM
Here is a corker wally....
So while running our 2011 cat 315 with no problems, out of the blue while the auto idle is engaging, the engine bogs down spits white smoke and has a boost reading of negative 8. After a long story and 3 tech visits we have replaced the throttle dial, the boost sensor (new one still reads negative 8/9 when engine bogs down. I should say engine runs fine as long as its under load. The colder it is the less frequent the problem (it will idle down sometimes). the hotter it gets the more frequent it will bog out when load is reduced. only way to get rpms up again is shut the machine off and turn on again. the hotter it is the longer it we have to wait to start it again Latest tech noticed the hose from the air cooler to the air intake on the engine was being sucked flat when the engine bogged down. took hose from turbo to air cooler off and still bogged, plus works great when high rpms, so not the turbo. Have just replaced the hose from turbo to air cooler but dont think that needed to be done, nothing seemed wrong with the one we replaced. we will see tomorrow . any ideas. thanks