Regal1973
Petty Officer 2nd Class
- Joined
- Feb 15, 2018
- Messages
- 106
I posted last year reference a 2008 5.7 Volvo Penta motor issue which resulted in water ingestion into motor.
Motor is a Volvo Penta 5.7L Gi-G
Motor has now been replaced with a brand new VP motor with new VP heads & new exhaust (not a remanufactured motor but a VP motor (orig intake was swapped to new motor). Boat now runs flawless with the exception of an idle issue. This issue has existed since day one of the new engine install.
Once motor has warmed up & out of closed loop mode, idle starts fluctuating 200-250 rpms, almost sounding like it has a small cam in it, up down loping. Sometimes it will smooth out for a couple minutes then right back into the loping. When in gear, it does not show this symptom, only when it's in neutral.
Motor was installed by a VP authorized repair shop & who has been assisting me in trying to figure it out but to date, weve been unsuccessful.
Things that have been done thus far:
* engine scanned by VP dealer for codes (No Codes)
* new IAC & operating correctly according to VP
* new Crank Senor installed & operating correctly
* new rotor & cap
* TPS operating within parameters according to VP
* no binding on throttle cable at throttle body
* PCV valve in valve cover operating correctly
* both hi & low pressure fuel pumps within specs
* fuel pressure regulator is operating correctly according to VP
* Fuel injectors were cleaned and flowed by VP dealer at time of engine install.
A video clip of motor running was captured on the VP dealers diagnostic laptop and sent out to Volvo Penta and the reply back was that all seems to be operating within parameters.
VP dealer and I are now scratching our heads. It happens everytime motor comes out of closed loop mode, just after warm up. Sometimes it will smooth out for a couple minutes but ends up going back into idle issue. The idle issue makes it difficult to shift smoothly because of the rpms.
If anyone can chim in on this, or if you know someone experienced in diagnosing VP motor issues who you can point me towards, I would greatly appreciate it.
Motor is a Volvo Penta 5.7L Gi-G
Motor has now been replaced with a brand new VP motor with new VP heads & new exhaust (not a remanufactured motor but a VP motor (orig intake was swapped to new motor). Boat now runs flawless with the exception of an idle issue. This issue has existed since day one of the new engine install.
Once motor has warmed up & out of closed loop mode, idle starts fluctuating 200-250 rpms, almost sounding like it has a small cam in it, up down loping. Sometimes it will smooth out for a couple minutes then right back into the loping. When in gear, it does not show this symptom, only when it's in neutral.
Motor was installed by a VP authorized repair shop & who has been assisting me in trying to figure it out but to date, weve been unsuccessful.
Things that have been done thus far:
* engine scanned by VP dealer for codes (No Codes)
* new IAC & operating correctly according to VP
* new Crank Senor installed & operating correctly
* new rotor & cap
* TPS operating within parameters according to VP
* no binding on throttle cable at throttle body
* PCV valve in valve cover operating correctly
* both hi & low pressure fuel pumps within specs
* fuel pressure regulator is operating correctly according to VP
* Fuel injectors were cleaned and flowed by VP dealer at time of engine install.
A video clip of motor running was captured on the VP dealers diagnostic laptop and sent out to Volvo Penta and the reply back was that all seems to be operating within parameters.
VP dealer and I are now scratching our heads. It happens everytime motor comes out of closed loop mode, just after warm up. Sometimes it will smooth out for a couple minutes but ends up going back into idle issue. The idle issue makes it difficult to shift smoothly because of the rpms.
If anyone can chim in on this, or if you know someone experienced in diagnosing VP motor issues who you can point me towards, I would greatly appreciate it.