Hey everyone,
On the last trip last season my 1999 Sunsport with twin 5.7 mercruiser EFI (TBI) motors had an issue. Port motor runs great. Starboard motor starts right up when cold, will idle great, can advance the throttle and all goes well. Once it warms up for about 5 minutes it cuts out, almost like I pull in a choke or something and just stalls right out. It will start right back up no problem but then die right out if at idle. It will run if I advance the throttle to like 1500-2000 rpm but once I back off it stalls again.
I just did all the good regular maintenance and the problem still remains. Both motors got new cap and rotor, fuel filter, oil change and filter, plugs, cleaned spark arrestor and both drives serviced. Problem is still there.
Anyone have this issue before or know where I should look first? My plan is to dig into it a little more this weekend. Fuel pressure test first? It does have the cool fuel system, not sure what that really does? From what I can see the previous owner replaced the IAC already, but I can try it again. Port motor runs great so I don't think its a tank vent issue but I could be wrong. MAP or TPS?
thanks!
On the last trip last season my 1999 Sunsport with twin 5.7 mercruiser EFI (TBI) motors had an issue. Port motor runs great. Starboard motor starts right up when cold, will idle great, can advance the throttle and all goes well. Once it warms up for about 5 minutes it cuts out, almost like I pull in a choke or something and just stalls right out. It will start right back up no problem but then die right out if at idle. It will run if I advance the throttle to like 1500-2000 rpm but once I back off it stalls again.
I just did all the good regular maintenance and the problem still remains. Both motors got new cap and rotor, fuel filter, oil change and filter, plugs, cleaned spark arrestor and both drives serviced. Problem is still there.
Anyone have this issue before or know where I should look first? My plan is to dig into it a little more this weekend. Fuel pressure test first? It does have the cool fuel system, not sure what that really does? From what I can see the previous owner replaced the IAC already, but I can try it again. Port motor runs great so I don't think its a tank vent issue but I could be wrong. MAP or TPS?
thanks!