Stalling after reversing

MalibuMike

Petty Officer 2nd Class
Joined
Dec 29, 2020
Messages
123
2007 5.7 with. Dp-s. Put the boat in reverse and bring the RPMS up to back up. Back to neutral and get a stall. Any idea where to start?
 

MalibuMike

Petty Officer 2nd Class
Joined
Dec 29, 2020
Messages
123
When was the last full tune up?
Its been a year and half since spark plugs were changed. I change the cap and rotor about every 6 months since Napa has lifetime warranties on their Echlin line of caps and rotors. Spark plug wires are older. IAC has never been cleaned.
 

jimmbo

Supreme Mariner
Joined
May 24, 2004
Messages
12,944
Perhaps you are backing up too fast and water is being pushed back up the Exhaust, and the Backpressure is strangling the engine
 

mvn

Petty Officer 1st Class
Joined
Jul 25, 2007
Messages
202
Same issue with a 2008 5.0L. It ended up being a bad IAC. Only an OEM Merc replacement solved the problem.

Mark
 

dubs283

Vice Admiral
Joined
Jul 27, 2005
Messages
5,058
Its been a year and half since spark plugs were changed. I change the cap and rotor about every 6 months since Napa has lifetime warranties on their Echlin line of caps and rotors. Spark plug wires are older. IAC has never been cleaned.

Piecemeal tune up over time isn't a good strategy. Would question the quality of napa brand components as well, might be okay for an older auto but your boat needs special attention

Is this mpi or tbi? HEI/EST ignition allows for timing adjustment

Have you inspected/replaced fuel filters?

Not a bad idea to remove, inspect and clean the iac
 
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