Some back history of my idle issues. After finding that my new to me 2008 boat I I purchased had an engine that was taking in water via the exhaust, I purchased a brand new 2008 spec 5.7L Volvo Penta GI-G replacement short block motor ( not a remanufactured motor).
A local VP dealer installed motor and since day one, it has had an idle issue. Over 1 year now and the VP dealer has basically thrown up their hands saying they've done everything that they can do to try and figure it out. Once warmed up, motors idle lops up and down about 150-200rpm. Makes it hard to shift smoothly but lopping goes away as soon as you advance the throttle the slightest bit.
The compression, vacuum, fuel pressures high & low all within spec. Crank trigger sensor replaced, IAC valve replaced, throttle position sensor operating correctly, map sensor appears to be operating correctly, thermostat is a 160*, injectors all cleaned and flowed when engine installed, spark plugs look good, timing correct etc.
VP dealer put laptop on motor and no issues or codes showing up. I rented a scanner diagnostic tool from company I purchased motor from and all feedback info seems within specs. The company I purchased motor from has done more to try and diagnose over the phone the issues than I feel the VP dealer has done. The VP dealer has given me so many excuses and no resolve. Their last option was for me to send my computer out to California to get it reprogrammed because they said the new motors fuel burn rates are not compatible with the new engine.....BUT ITS THE EXACT SAME ENGINE WITH EXACT SAME SPECS AS ORIGINAL that came in boat.....so I'm super confused at this point.
The idle issue I think I've narrowed down to a temp related issue but please, I'm looking for ANY FEEDBACK. As soon as motor warms up, it will begin lopping. Temps will rise up to around 170-173* & then the temps drop quickly when thermostat has opened up. As soon as temps drop below 160*, the engine idles perfectly smooth. As soon as temps rise above 160*, it begins lopping again. So it appears that ( if temp guage is correct) that between 160* & 170ish, the idle issue rears its ugly head. The motor runs perfect without a hiccup, it's just at idle that it has any issues.
I'm in west central Florida where water temps range depending on time of year, but it does it on the hose too when on trailer, and I'm pulling fairly cold water from our well. At this point I have no idea what to do next. VP dealer had written me off saying they csnt help, motor company has tried to help over phone but no success and VP corporate office has been a dead end for the most part. I hate looking at this expensive beautiful boat on its trailer and thinking that it has become a piece of yard art....sighhhh
Any help would be greatly appreciated!!!!!
A local VP dealer installed motor and since day one, it has had an idle issue. Over 1 year now and the VP dealer has basically thrown up their hands saying they've done everything that they can do to try and figure it out. Once warmed up, motors idle lops up and down about 150-200rpm. Makes it hard to shift smoothly but lopping goes away as soon as you advance the throttle the slightest bit.
The compression, vacuum, fuel pressures high & low all within spec. Crank trigger sensor replaced, IAC valve replaced, throttle position sensor operating correctly, map sensor appears to be operating correctly, thermostat is a 160*, injectors all cleaned and flowed when engine installed, spark plugs look good, timing correct etc.
VP dealer put laptop on motor and no issues or codes showing up. I rented a scanner diagnostic tool from company I purchased motor from and all feedback info seems within specs. The company I purchased motor from has done more to try and diagnose over the phone the issues than I feel the VP dealer has done. The VP dealer has given me so many excuses and no resolve. Their last option was for me to send my computer out to California to get it reprogrammed because they said the new motors fuel burn rates are not compatible with the new engine.....BUT ITS THE EXACT SAME ENGINE WITH EXACT SAME SPECS AS ORIGINAL that came in boat.....so I'm super confused at this point.
The idle issue I think I've narrowed down to a temp related issue but please, I'm looking for ANY FEEDBACK. As soon as motor warms up, it will begin lopping. Temps will rise up to around 170-173* & then the temps drop quickly when thermostat has opened up. As soon as temps drop below 160*, the engine idles perfectly smooth. As soon as temps rise above 160*, it begins lopping again. So it appears that ( if temp guage is correct) that between 160* & 170ish, the idle issue rears its ugly head. The motor runs perfect without a hiccup, it's just at idle that it has any issues.
I'm in west central Florida where water temps range depending on time of year, but it does it on the hose too when on trailer, and I'm pulling fairly cold water from our well. At this point I have no idea what to do next. VP dealer had written me off saying they csnt help, motor company has tried to help over phone but no success and VP corporate office has been a dead end for the most part. I hate looking at this expensive beautiful boat on its trailer and thinking that it has become a piece of yard art....sighhhh
Any help would be greatly appreciated!!!!!