Jacques321
Petty Officer 2nd Class
- Joined
- Jul 23, 2001
- Messages
- 129
My Merc 90 4 stroke tends to stall if I push the throttle down hard even after a ten minute warm-up!! Later after I run it for a while it seems to be OK.<br /><br />Now my marine mechanic checked it out, and here's what he did:<br />- calibrated the carbs<br />- changed a fuel pump (my engine's only 1 yr old!)<br />- One of my choke sensors was cracked, but not faulty!!(CAN YOU BELIEVE THIS!)So they changed that($320 part on warranty)<br /><br />I got my boat back and the shop told me everything was ok.<br /><br />So I launch the boat and warm up the 4 stroke for 10 mins. My RPM's drop to 800. So I try it again I open the throttle(swiftly), wide open, and you guessed it the engine stutters and dies. I tried this 3 times and got the same result. If I bring the throttle down a little slower it's OK. GO figure?<br /><br />I called the shop and they told me that a carbureted 4 stroke will not respond as quickly as a 2 stroke fuel injected, especially with a heavier SS prop. I told them I already knew that and that it doesn't seem normal that my engine should stall on me even when it's still a little cold.<br /><br />Anyone else wth a 4 stroke having this problem?<br /><br />------------------<br />Princecraft 164(2000)<br />Merc 90-4 stroke<br />Prop:Vengeance SS 16P
