2003 ISX suggestions needed

[DDlighttruck]

(07-28-2017 )Billdozer2 Wrote:  Although my engine is different, I have a 2250, I was having issues with turbo cough. Randomly while climbing a hill, the boost would hover right around 30 psi or so, turbo would cough, boost would drop to around 15 psi, and then climb back up to the low 20's. Sometimes the boost would go no higher than 20 psi all day. No check engine lights. Nothing. Using information from this forum, I decided to replace the sensors that directly deal with boost information to the ECU (Thinking that incorrect information was being sent to the ECU) I replaced the IMAP and the Exhaust Gas Pressure Sensor. Turbo cough is gone. Fuel mileage is up. Boost pressure is back up and truck is running great, for now.

I know it may sound silly to replace sensors even though the truck is not telling you that anything is wrong, aka Check Engine Light. Cummins Quickserve even says that you should not replace the IMAP just because it has soot in it. But, the sensors on these engines get covered in soot and start sending false information to the ECU. They should be replaced as preventative maintenance.

I'm going on blind faith that what you and everyone else has said. Arguably $1200 isn't a lot of money but it's hard to swallow when there are no codes or justification to do so. Some of that is a low coolant sensor and a rear axle temp sensor but still. That is a chunk of change.

So tomorrow we pull a lot of stuff apart and put it back together. Hopefully the money is recouped in fuel savings. I appreciate the advice I don't have an issue spending the money if I see the return.
Thanks