Cummins ISM not reading boost correctly?

[Mikesuburban1]

(02-26-2017 )Waterloo Wrote:  

(02-26-2017 )Mikesuburban1 Wrote:  

(02-26-2017 )Waterloo Wrote:  That is low miles, the pyro is at the edge, so you may just have a head gasket issue... I would lean towards a bad gasket, OR you have a stretched or lose head bolt. I would pop the top and check the torque of the bolts holding the head to the block. If one has worked its way lose, and this has been an issue on the ISX, you may get lucky. I would go there first, re torque the head bolts. I do not know the torque specs, but that should be easy info to get. I think you dodged a bullet here. ;-)

Side note, the head bolts are one time use, as they stretch. If it is a lose head bolt, I would replace and if me, pull the head, replace the gasket and install new bolts. Not a huge job, if you have a way to pull the head, they are not light.

Wouldnt i be loosing coolent if it was a head gasket and how would that relate to my boost problem with it spiking?

You would not necessarily lose coolant with a bad head gasket, but when you said the coolant jug was building pressure, that is usually a sign of a bad head or gasket. That is why I suggested a block test kit to see if you have exhaust gas in your coolant system. When my head failed, I had no coolant loss, other than what was passed through my hose clamps, and eventually my coolant jug. I routinely pull oil samples and had it tested. I never had coolant in my oil, but boy did I have exhaust gas in my coolant system. It built so much pressure that it actually blew my radiator apart sitting at the dock at the GM plant here in Lansing where they build the Camaro... This was a year ago, and the guys on the dock still chide me on that.

Another place to check is your air compressor, sometimes those will leak into your coolant system, at least on an ISX.

Your other issues are not related.

Im going to test it tomorrow i hope its not a head gasket that would suck.