Getaway
Well-Known Member
- Oct 13, 2010
- 1,077
- Boat Info
- 1998 290DA Sundancer
Lowrance electronics, Fishhawk, Scotty Downriggers
BoatWheels Tri-Axle Trailer
- Engines
- Single big block 454 MPI Mercruiser engine and Bravo III outdrive.
I searched and could not find where this had been addressed in the past.
I have the engine stated in the topic. Mercruiser 7.4L MPI, 1998 vintage, Bravo III outdrive - 1998 290DA.
Runs perfect, however, when above dead idle, if you pull the throttle quickly to neutral or up against the neutral detent (but still in gear), it periodically will stall.
It's like the motor can't recover (idle wise) from bumping the ignition interrupt for shifting from forward into neutral.
It seems, the computer idles it down too low or the recovery time is too long when getting into the ignition interrupt from a higher idle point. If this makes sense..
If I'm at dead idle (just bumped in gear), no problem at all. In and out of gear for docking is great. But if I'm up at 900-1000 r's and pull it quickly down to dead idle or into neutral, she quits.
It will always quickly restart. If I'm careful and shift slowly, no problem. It's that quick neutral pull that causes this issue.
I've already changed TPS, IAC, Fuel Pump, Fuel pressure regulator and a few other things. The engine actually runs phenomenal other than this little annoyance. I'm being told by a mechanic that this is a typical problem and "they all do this". Well, I'm not buying it. There are probably 50 of these engines in our marina and I'm the only one having to restart when I approach my dock...LOL.
Any thoughts? I'm thinking there must be an ECM update or something that corrects this..?? Maybe I can make an adjustment mechanically to prevent this?
Thank you all in advance.
I have the engine stated in the topic. Mercruiser 7.4L MPI, 1998 vintage, Bravo III outdrive - 1998 290DA.
Runs perfect, however, when above dead idle, if you pull the throttle quickly to neutral or up against the neutral detent (but still in gear), it periodically will stall.
It's like the motor can't recover (idle wise) from bumping the ignition interrupt for shifting from forward into neutral.
It seems, the computer idles it down too low or the recovery time is too long when getting into the ignition interrupt from a higher idle point. If this makes sense..
If I'm at dead idle (just bumped in gear), no problem at all. In and out of gear for docking is great. But if I'm up at 900-1000 r's and pull it quickly down to dead idle or into neutral, she quits.
It will always quickly restart. If I'm careful and shift slowly, no problem. It's that quick neutral pull that causes this issue.
I've already changed TPS, IAC, Fuel Pump, Fuel pressure regulator and a few other things. The engine actually runs phenomenal other than this little annoyance. I'm being told by a mechanic that this is a typical problem and "they all do this". Well, I'm not buying it. There are probably 50 of these engines in our marina and I'm the only one having to restart when I approach my dock...LOL.
Any thoughts? I'm thinking there must be an ECM update or something that corrects this..?? Maybe I can make an adjustment mechanically to prevent this?
Thank you all in advance.