Cummins ISX low boost high exhaust temps - TheDieselGarage.com
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post #1 of 26 (permalink) Old 01-21-2012, 02:36 AM Thread Starter
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Cummins ISX low boost high exhaust temps

I have a 2006 ISX cummins 530 hp with 433,000 miles on it. It is an EGR motor. Problem is lately since weather has started to cool up motor will sometimes loss boost of about 10 lbs and exhaust temp will climb to 1000 to 1100 degrees. You might drive 5 miles and it comes out of it. You will hear a change in the sound of the motor boost pressure will come back up to normal for pull or load and exhaust temp will come back down to normal. When it does this you will hear a difference is the sound of the motor. first time it done this truck was rolling under load and flat round with aprox 50 to 60 load on it 23lbs of boost pressure and intial exhaust gas temp of 700 degrees. I heard a change is sound and looked down and noticed low boost it was down to 13 lbs and pyrometer and climbing up and stopped around 1100 degrees. Drove about 5 miles pulled over checked around found nothing. Low power on getting back up to speed. About another 5 miles and motor changes pitch and all readings come back to normal. Boost rolled up and Exhaust temp came back down. Truck continues to due this in cool weather. If you run down south for the week, truck will no due this all week come north and it will do this all the time. 35 degrees or less and it does it. Changed out Exhaust gas pressure sensor, did not fix. Any ideas?
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post #2 of 26 (permalink) Old 01-21-2012, 03:15 PM
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check the turbo see if the shaft rocks enough to hit the housing also check the boost sensor see if its plugging up
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post #3 of 26 (permalink) Old 01-22-2012, 04:25 AM
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being this is a 2006 does they truck have a DPF system? Usally when the DPf system becomes clogged it will throw throw the engine into a de rate which in turn will knock out your EGR valve and ETC.... I would check this also

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post #4 of 26 (permalink) Old 01-22-2012, 04:36 AM
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Needs turbo. The varible vanes are sticking
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post #5 of 26 (permalink) Old 01-22-2012, 11:52 AM
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Needs turbo. The varible vanes are sticking
Could you explain what that means in a bit more detail? Also,why do you think it's happening in cold temps only? thx

-Doug
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post #6 of 26 (permalink) Old 01-22-2012, 03:56 PM
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one sure way to check your turbo is through cummins insite if you have the ability. you may be having issues with the VGT actuator located on top of the turbo.

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post #7 of 26 (permalink) Old 01-22-2012, 06:01 PM
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I have seen your problem.(because i have a isx too) but i think, but im not sure. the problem might be in the barometric sensor. (ambient sensor)this sensor is in the main hardener of the ecm.(in the button of compressor) its flat square sensor an has 3 wires. but if water, oil dirt get on it, and this sensor has a little hole of air read ambient,(work with turbo actuator you can see a little hose goin to turbo) if the water or hole plugged the sensor act bad. its a possibility that when you or someone washed the motor with a water pressure could have plugged up that hole. if u have laptop(insite) u need to read 20.6hg or less i believe. that for lower than 10,000 feet alt. this makes the ecm act dumb and all sensors and derated afc

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post #8 of 26 (permalink) Old 01-23-2012, 01:29 AM
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Could you explain what that means in a bit more detail? Also,why do you think it's happening in cold temps only? thx
If the one on the ISX is built like the HE351VE used on the 6.7L Cummins in the Ram trucks, it is a sliding collar that changes the geometry of the turbine housing. The soot can build up in the moving parts and the actuator can't move it properly.

http://www.youtube.com/watch?v=FLZHj-EPj0g


In the 2nd video, you can see the turbine housing. The vanes on the turbine wheel fit in the slots of the rotating collar in the turbine housing at the left. If those slots fill with soot, the that collar can stick as well. Everything can be cleaned, but the dealers pretty much just replace them under warranty.

http://www.youtube.com/user/BraydenF...41/exsyhvw_6Do

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post #9 of 26 (permalink) Old 01-23-2012, 06:01 AM
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Quote:
Originally Posted by pichu2 View Post
if u have laptop(insite) u need to read 20.6hg or less i believe. that for lower than 10,000 feet alt. this makes the ecm act dumb and all sensors and derated afc
21"Hg would be more like 8800 feet. For Bay Area in CA it needs to be about 30"Hg

www.bigrigshots.com
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post #10 of 26 (permalink) Old 01-23-2012, 07:11 AM
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Quote:
Originally Posted by bucko149 View Post
I have a 2006 ISX cummins 530 hp with 433,000 miles on it. It is an EGR motor. Problem is lately since weather has started to cool up motor will sometimes loss boost of about 10 lbs and exhaust temp will climb to 1000 to 1100 degrees. You might drive 5 miles and it comes out of it. You will hear a change in the sound of the motor boost pressure will come back up to normal for pull or load and exhaust temp will come back down to normal. When it does this you will hear a difference is the sound of the motor. first time it done this truck was rolling under load and flat round with aprox 50 to 60 load on it 23lbs of boost pressure and intial exhaust gas temp of 700 degrees. I heard a change is sound and looked down and noticed low boost it was down to 13 lbs and pyrometer and climbing up and stopped around 1100 degrees. Drove about 5 miles pulled over checked around found nothing. Low power on getting back up to speed. About another 5 miles and motor changes pitch and all readings come back to normal. Boost rolled up and Exhaust temp came back down. Truck continues to due this in cool weather. If you run down south for the week, truck will no due this all week come north and it will do this all the time. 35 degrees or less and it does it. Changed out Exhaust gas pressure sensor, did not fix. Any ideas?
Either turbo is going bad and can't be actuated because is sticking internally or the external actuation system is not fully functional. Here is simple test:

http://bigrigshots.com/2012/01/23/vg...o-quick-check/

www.bigrigshots.com
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