ISX 2350 485

[Hammerhead]

(02-01-2017 )Rawze Wrote:  You cannot compare boost and other reading from cat to cummins 2350. Engines are totally different including compression ratios, fueling, boost, everything, literally.

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I have seen a few 2350 engines boost up to 38-lbs. Even a couple that did it new from the factory. It is actually not normal and is too high for them. It should peak around 32-33 max, but the OEM shops will ignore it because it does not throw a CEL.

Too high boost (or low) can be caused by many different things, including NOx sensors and emissions system components. Usually though, it is caused by the IMAP, exhaust back-pressure, and/EGR differential pressure sensor not reading correctly. It can also be caused by the Altitude sensor reading incorrectly, and it thinks you are at a higher altitude, and need more oxygen in the cylinders.

It can also be from the wrong program in it, and don't think for a minute that just because no one has touched it but the stealership, that it could not have been altered. I have seen it plenty. -- It also may simply be that the ECM has an out of date file that is causing over-boost, and it needs an update.


-- Your biggest mistake so far is the fact that you keep taking it to morons (OEM stealerships). Keep doing that and you will eventually end like all the rest of the guys who fail at trucking, or are completely broke all the damn time, tens of thousands in lost revenue while they guess at your problems over and over.

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Throw that warranty in the trash can, go make an appointment wit Mr. Hag's shop, gearheads shop, or with Unilevers and never look back while you still have a good chance towards turning it into a decent engine.

I read the bold paragraph as more of a fuel consumption comparison, not boost comparison. Hope I'm not wrong on that. Higher static compression requires less boost to accomplish the exact same final compression, that's why the 870, 871...have higher boost, they have less static compression.

The rest of Rawze's post is the truth. Sometimes the truth can be brutal and people don't want to face the fact that the guys with the big fancy buildings and the nice smiles that treat you so nice really aren't trying to help you. They are trying to help themselves to your wallet. They're just like the mob, so nice to deal with as long as they're fleecing you. Once you really learn what's going on, and take matters into your own hands, your very expensive warranty is void and they don't wanna have time to talk to you anymore.