We have a pair of ~2007 8.1L MPIs in our 1971 Magnum. They have been really solid to date. However, we've had one really odd issue occur recently on our starboard engine.
When increasing RPM through 2,500rpm or decreasing from 3,000rpm cruise rpm through 2,500rpm, the engine RPM will suddenly the engine will drop to idle and lock the throttle out. Meaning the throttle cable continues to manipulate the throttle on the engine but no electronic throttle response from the engine. Otherwise said the throttle will remain at the 2,500rpm position but he engine will be idling.
When throttling up, if you make it through the 2500rpm threshold, she will run beautifully. No signs of any mechanical issue with the engine. 2,500rpm also seems to coincide with a timing/ignition shift.
Restarting the engine immediately brings back normal throttle function, so seems like it may be an electronic gremlin.
Any thoughts on what this might be?
Thanks in advance for any ideas.
When increasing RPM through 2,500rpm or decreasing from 3,000rpm cruise rpm through 2,500rpm, the engine RPM will suddenly the engine will drop to idle and lock the throttle out. Meaning the throttle cable continues to manipulate the throttle on the engine but no electronic throttle response from the engine. Otherwise said the throttle will remain at the 2,500rpm position but he engine will be idling.
When throttling up, if you make it through the 2500rpm threshold, she will run beautifully. No signs of any mechanical issue with the engine. 2,500rpm also seems to coincide with a timing/ignition shift.
Restarting the engine immediately brings back normal throttle function, so seems like it may be an electronic gremlin.
Any thoughts on what this might be?
Thanks in advance for any ideas.