Cm870 low boost high egt

[Oilysnowman]

(02-13-2026 )tree98 Wrote:  I've never seen a turbo test in insite that gives a percentage like your saying.

I see. Mine has turbocharger and egr functionality test, then I can select both or either or. Select just the turbo, and it revs itself up to 1200 rpm and changes the turbo between 5% and 95%. Once it’s done it shows % changed and pass or fail. My old turbo showed fail at somewhere close to 75% change. Not long after that the vanes got completely stuck.

[Benjamin9669]

Cm870 kinda same thing here, seems to pull pretty decent when it’s warm outside, colder outside boost is laggy and hard to get over 20 sometimes, once warm it’ll help try to get it to 30 when it use to be 36-37psi. Me don’t know lol.

[tree98]

(02-14-2026 )Oilysnowman Wrote:  

(02-13-2026 )tree98 Wrote:  I've never seen a turbo test in insite that gives a percentage like your saying.

I see. Mine has turbocharger and egr functionality test, then I can select both or either or. Select just the turbo, and it revs itself up to 1200 rpm and changes the turbo between 5% and 95%. Once it’s done it shows % changed and pass or fail. My old turbo showed fail at somewhere close to 75% change. Not long after that the vanes got completely stuck.

Must be a test specifically for the 870 air actuated turbo. Sticky vanes will definitely cause high EGT and low boost.