Hopefully some of you have done the same thing as I have and have some insight into my problem.
I have a 1999 Albemarle 242 that had an inboard Volvo 5.0 liter (305 ci) V8 with throttle body fuel injection. After replacing almost all the peripherals on the engine it finally gave up the ghost and went to live with Davy Jones. I bought a 5.7 liter (350 ci) Chevy long block and had a gentleman to remove the old engine, take all the parts off and put them on the new long block. The engine was installed and rewired. After some initial tweaking with the timing everything ran well while underway. The problem is with the idle. At first it would idle at 600 rpm, jump to 1200 rpm, back to 600 rpm and them cut off. The next day it only idled at 1200 rpm. I took it to Angler?s Marine an they made a few adjustments. It now will idle at 600 but if I bump up the throttle and return it to idle it stays at the last rpms. This is being done at my house.
So the question is, is there a problem with the throttle position sensor? And the big one. Do I need to install a new engine control module (ECM)? My thought is that the old ECM is still trying to mix the fuel/air ratio for a 305 when it is really a 350. Has anyone else done this and if so did you switch out the ECM? Can the old ECM be reprogrammed/flashed? Where would I find a low priced ECM?
I have a 1999 Albemarle 242 that had an inboard Volvo 5.0 liter (305 ci) V8 with throttle body fuel injection. After replacing almost all the peripherals on the engine it finally gave up the ghost and went to live with Davy Jones. I bought a 5.7 liter (350 ci) Chevy long block and had a gentleman to remove the old engine, take all the parts off and put them on the new long block. The engine was installed and rewired. After some initial tweaking with the timing everything ran well while underway. The problem is with the idle. At first it would idle at 600 rpm, jump to 1200 rpm, back to 600 rpm and them cut off. The next day it only idled at 1200 rpm. I took it to Angler?s Marine an they made a few adjustments. It now will idle at 600 but if I bump up the throttle and return it to idle it stays at the last rpms. This is being done at my house.
So the question is, is there a problem with the throttle position sensor? And the big one. Do I need to install a new engine control module (ECM)? My thought is that the old ECM is still trying to mix the fuel/air ratio for a 305 when it is really a 350. Has anyone else done this and if so did you switch out the ECM? Can the old ECM be reprogrammed/flashed? Where would I find a low priced ECM?
