My apology if this questions has been asked many times. I did a search but could not locate an answer.
As the title indicates, my 2006 496 HO starts then stalls. I called for service. I was told they had to replace both fuel pumps (Low & high pressure). They contacted me said the boat is running. I went to start the engine -- same problem. The engine cranks then stalls within 5 seconds. The engine never runs normal then stalls, more link a rough idle. I replaced the IAC, no change. I try to advance the throttle while I'm trying to get the engine to run. It dies.
I called the tech to come back to the boat. He connected his computer for diagnoses. It indicated both cam and crank sensors were bad. He replaced them. Now the boat will not start -- almost like its not getting a spark (where is that old distributor cap. I will see if its providing a spark!) I asked him if either one of the sensors he replaced could be causing the engine not to start? He said NO. He came back the next day. Spent 8 hours trying to figure out the problem. He disconnected all the electrical connections from the boat network to try to isolate the engine. He connected a start button to crank the engine. The engine would crank but never started.
He said the boat needs to come out of the water (Formula 370 Super Sport). The engine needs a new wiring assembly. You have got to be kidding! The engine started before you messed with it. Now it will not crank over. So he said, I have no other option.
Today, I decided to reconnect everything he disconnected. I removed the cam & crank sensors he installed. I looked at all the connections looking for any wires that might have been frayed/damaged/etc... I checked all the fuses, the lanyards, anything I found on the internet that provided some clues.
The engine now starts (again) but stalls. I am back to where I started after spending $1300 for travel, labor, and parts to put me back at square 1 again. I am not a mechanic but I can read and follow directions. Can someone help me figure out what is wrong with my engine? Initially, everyone I spoke to said it was -- 100% the IAC. Now that I replaced it and the IAC did not solve the problem, what other options do I have? Here is a recap: both fuel pumps were replaced. Technician said the boat was running -- I doubt it!!. Replaced the IAC. NO change. Engine starts then stalls. Technician comes back. Replaces CAM and Crank sensor. Now the engines cranks but does not start. I removed the sensors he replaced and put back the old ones. The engine starts, rough idle, stalls. Where do I go from here?
Thank you in advance for your recommendations.