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JoeHEB1
Advanced Member
498 Posts |
 Posted - 05/05/2014 : 06:04:50 AM
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| Engine had an oil leak, long story short the IPR valve was leaking through the connector. Tech replaced IPR valve and parked the bus. Now the bus cranks and starts for half a second and shuts off, it won't stay running. ServiceMaxx says ICP unable to build pressure, that's probably from not starting. It has had long cranking issues before the IPR valve was changed and haven't been able to replace the injector pucks yet, wondering if they finally gave up the ghost. Any thoughts? |
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second.flood
Top Member
USA
640 Posts |
Posted - 05/05/2014 : 06:18:02 AM
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High pressure fuel rail 'O rings?
Fuel should be "oil". Sorry |
Edited by - second.flood on 05/06/2014 09:00:51 AM |
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JoeHEB1
Advanced Member
498 Posts |
Posted - 05/05/2014 : 06:43:48 AM
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| I thought high pressure fuel rail was on Maxxforce 7 only. Maxxforce DT has a HPOP. I could be wrong. |
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Bassman
Top Member
USA
558 Posts |
Posted - 05/06/2014 : 03:15:58 AM
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| Oil dilution from the in cyl dosing. |
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JoeHEB1
Advanced Member
498 Posts |
Posted - 05/06/2014 : 07:07:48 AM
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| @Bassman, changing the oil in it now to see if that helps any. It hasn't shown on the dip stick that it's making any oil, but it couild still be diluted. |
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slippert
Top Member
USA
630 Posts |
Posted - 05/06/2014 : 09:29:55 AM
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I have had buses with those engines roll in from afternoon route running fine and then not start the next morning due to seals on one of the pucks failing .... IDK.. if the seal failed as it was shut down or what? although the ones I have had didn't atempt to start at all...when that happened..
I take it connections/wiring on IPR are good?
You said Servicemaxx says unable to build ICP pressure, are you seeing any pressure reading on parameter list? |
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JoeHEB1
Advanced Member
498 Posts |
Posted - 05/06/2014 : 11:00:20 AM
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| Wiring is good at IPR valve, ICP pressure builds real slow then it attempts to start for a split second and shuts off. The bus will start with ether and run just fine but when it cools down it won't start without ether. This all started when the IPR was changed. The long cranking issue has been going on for a few weeks just haven't had a chance to replace the injector pucks due to driving routes morning and afternoon because drivers can't show up, giving us little time in the shop. |
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aaronwilmoth80911
Top Member
538 Posts |
Posted - 05/07/2014 : 06:37:47 AM
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| We had one with very similar issues to yours and it ended up being the pucks. |
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JoeHEB1
Advanced Member
498 Posts |
Posted - 05/07/2014 : 06:41:49 AM
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| Update: Bus has been starting just fine on it's own, I haven't done a thing to it other than replacing the IPR valve. I'm wondering if it had air in the oil manifold since you lose oil when replacing the IPR valve? |
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JoeHEB1
Advanced Member
498 Posts |
Posted - 05/07/2014 : 06:44:42 AM
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| @aaronwilmoth80911 I have pucks coming and will install them soon. That should cure the long cranking issue it's having. |
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Brad Barker
Administrator
USA
874 Posts |
Posted - 05/21/2014 : 5:29:26 PM
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| Any time the HPO system is opened as when replacing the IPR, ICP, etc, it is recommended to drive the unit for twenty miles minimum. When oil runs out, air flows in and gets trapped in the HPO system. This will cause hard starting and low power issues until it is purged out. |
Brad A. Barker |
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JoeHEB1
Advanced Member
498 Posts |
Posted - 05/22/2014 : 04:08:26 AM
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quote:
Originally posted by Brad Barker
Any time the HPO system is opened as when replacing the IPR, ICP, etc, it is recommended to drive the unit for twenty miles minimum. When oil runs out, air flows in and gets trapped in the HPO system. This will cause hard starting and low power issues until it is purged out.
Makes total sense. |
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Topic |
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2008 Maxxforce DT 9/10
