2006 CM870 high EGTs

[Rawze]

Fourth head and 2'nd bottom end in 425k miles?? = someone does not know how to build the engine properly at all!@.. and taking it to the stealers$it is the WORST place to have an engine rebuilt, hands down. Those clowns are beyond absolutely clueless!.

Here is your story in a nut shell...
ref: http://rawze.com/forums/showthread.php?t...5#pid41315

And here is what SHOULD have happened.. THE FIRST TIME!!!... and that stealer$shi#t is not about to do things this way .. even if you had paid them extra...
ref: http://rawze.com/forums/showthread.php?t...6#pid70606


And BY THE WAY>>>> an ISX should be cresting at about 1050-F on the exhaust temps, post turbo, in a hard pull if you get on it hard/long enough. Oil temps should crest at about 230-235F~ish as well. At 240+F, the oil temps are getting too hot.

You also DID NOT MENTION what your boost was doing in a hard pull. It should be holding steady at about 37-38 psi (not deleted).. and about 36 psi or so if it IS properly deleted. If it jumps up there for a short bit, and then drops back down to only about 32psi or so,.. then the engine is an active boost derate. CM870's are notorious for this if something is wrong with the programming, or it detects the EGR system has issues, etc.

As far as local driving goes.. I hope you have the rear ends spec'd as such,.. especially if your hauling a bit over 80k.lbs. The rears should be about 4.11's on the high side.. and about 4.68 on the low end of the spectrum. -== If that thing has a set of 3.55's or god forbid taller (3.42's, 2.79's etc) in it.. then IT IS GEARED WRONG FOR THE APPLICATION AND TORTURING THE ENGINE!!!

Also THAT isx's sweet spot for maximum engine load and its hardest pulling as at 1650-1700RPM for longest lifespan, ... and not down at 1400 and below!. Keep that in mind while driving it!.

As far as a harmonic in it at 1400-1500 range.. this is well known. Any time the injection timing is too high, or something else causes the final CA for the firing angle to be too close to BTDC.. this occurs in the ISX's. .. A slipped cam,.. the wrong timing wedge was used during the rebuild for the valve or injector cam... bad programming,.. bad deletes.. bad fuel-air-mix.. you name it.. it gets amplified greatly. Even an after-garbage intake manifold can make them do this... as they have no baffles in them like the factory one does to, prevent intake cavitation on the back 2 cylinders.

Lastly.. but not least.. IF THAT MUFFLER is more than about 8 yars old.. ASSUME IT IS GETTING CLOGGED UP!!! AND REPLACE IT at first signs of higher than normal EGT's or slight power losses.


and WHEN WAS THE LAST TIME an EGR tune-up was done?... When s the last time someone replace the Delta-P sensor and its feed-lines?. The Intake pressure sensor?.. intake temp sensor?.. The exhaust pressure sensor and verified the circuit for it is not clogged up ion the thermostat housing (they are notorious for this and no one ever catches it).

WHEN IS THE LAST TIME??.. that someone pressurized the intake/cac, etc.. and checked if for leaks??..

AND/OR DOES IT HAVE AN AFTER-GARBAGE CAC UNIT IN IT LIKE THOSE STUPID DURALI$ITE BRAND OR SOME OTHER SEVERELY RESTRICTIVE NON-OEM charge air cooler TRASH???.

-- WHEN IS THE LAST TIME an injector leakage test was done to it???.. according to this video>>>??!!
ref: http://rawze.com/forums/showthread.php?t...8#pid67948

WHEN was the last time someone checked the timing and metering solenoids?...
ref: http://rawze.com/forums/showthread.php?t...619#pid619

I.E.> ...
YOU KEEP TAKING IT TO THE GAGGLE OF COMPLETE MORONS AND DON'T GRAB A DAMN WRENCH.. AND YOU WILL ONLY KEEP REPEATING YOUR COSTLY MISTAKES!!!> Throwing your problems at every stealers%it in town is the kiss of death for your equipment.. and your trucking business.