Troubleshooting help
05-13-2019, (Subject: Troubleshooting help ) 
Post: #1
Troubleshooting help
I've got an 08 CM871 Serial#79252599 485/1650 W/@m*m^2 and it keeps throwing fault code:
0629 - Turbocharger 1 Compressor Intake Pressure - Data Valid But Below Normal Operating Range - Moderately Severe Level
It comes and goes at random it seems like. Before this last round of tinkering there were 226 counts.
I've also had 70 counts of 2288 Turbocharger 1 Speed - Data Valid But Above Normal Operating Range - Least Severe and 13 counts of 3348 Turbocharger 1 Compressor Intake Pressure - Data Valid but below normal operational range - Most Severe Level

So far I've changed ALL the engine and turbo sensors, new air filter, and tried swapping with another known good ecm. Any help/ideas would be greatly appreciated.
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05-13-2019, (Subject: Troubleshooting help ) 
Post: #2
RE: Troubleshooting help
Has the CCV element been drilled out and both aftertreament can elements been "liberated"?
Are you leaking oil profusely?
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05-13-2019, (Subject: Troubleshooting help ) 
Post: #3
RE: Troubleshooting help
Is your air filter clean?
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05-13-2019, (Subject: Troubleshooting help ) 
Post: #4
RE: Troubleshooting help
(05-13-2019 )Chamberpains Wrote:  Is your air filter clean?

Yes just put a brand new one in.
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05-13-2019, (Subject: Troubleshooting help ) 
Post: #5
RE: Troubleshooting help
(05-13-2019 )Moose Wrote:  Has the CCV element been drilled out and both aftertreament can elements been "liberated"?
Are you leaking oil profusely?

Yes yes and no oil leaks.
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05-13-2019, (Subject: Troubleshooting help ) 
Post: #6
RE: Troubleshooting help
Has it happened all of a sudden or ever since the ecm was reprogrammed? Sounds like the VG tables need adjusting.
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05-14-2019, (Subject: Troubleshooting help ) 
Post: #7
RE: Troubleshooting help
(05-13-2019 )Signature620 Wrote:  Has it happened all of a sudden or ever since the ecm was reprogrammed? Sounds like the VG tables need adjusting.
It has be a growing problem, I want to say it started happening a couple weeks after it was reprogrammed, but honestly, it sat for that long before it was driven on a regular basis. I guess I could try a stock program and just ignore the other faults...
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05-15-2019, (Subject: Troubleshooting help ) 
Post: #8
RE: Troubleshooting help
how much boost is it making?

the symptoms you describe sound like an intake or exhaust restriction. After-market CAC?, Does get better power and boost when you have the exhaust disconnected from behind the turbo?


User's Signature: ->: What I post is just my own thoughts and Opinions! --- I AM Full Of S__T!.
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 Thanks given by: Techmech
05-15-2019, (Subject: Troubleshooting help ) 
Post: #9
RE: Troubleshooting help
(05-15-2019 )Rawze Wrote:  how much boost is it making?

the symptoms you describe sound like an intake or exhaust restriction. After-market CAC?, Does get better power and boost when you have the exhaust disconnected from behind the turbo?

It'll make about 36-38lbs boost on average. The cac appears to be genuine Navistar but I can't say with 100% certainty. And there doesn't seem to be any noticable difference with the exhaust disconnected. I will say whoever did the dpf filter made a complete mess of things and I had to clean that situation up/out.
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