2019 VNL 760
When starting with a heavy load, all appears to be normal. After 40 to 43 seconds while hammered down, boost suddenly drops to max of 15 psi via dash pressure gauge. Tried experimenting, had nothing to do with speed or rpm, literally a timed event.
The other strange items...
If we pull over, turn off truck, immediately turn back on, turbo operates normally for 40 to 43 seconds, again drops to 15 psi max turbo pressure.
Which leads us to try turning off engine and back immediately back on while moving down road. After the dash reset, again same above results. which can be replicated over and over.
Also, if we stay under 30 psi by throttling on flat terrain, we can continue without an issue and/or limit to time periods of 30+ psi to under 30 seconds, again, can continue relatively speaking.
No obvious air leaks - all appears to be secure
Turbo has less than 100k
Water separator replaced just in case, looked a bit dirty
Fuel filter replaced last week with water separator, possible bad fuel and TA put incorrect micron filter
New engine air filter
What can we test? Has anyone seen this exact same issue?
Turbo Boost Max 15 psi
Discussion in 'Volvo Forum' started by Espey127, Jun 5, 2022.
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