Idles high and low then stalls

SeaRay Smitty

SeaRay Smitty

New Member
May 26, 2022
5
Boat Info
2002 SeaRay Sundancer 240 MerCruiser 5.0
Engines
MerCruiser 5.0 bravo ll
Good morning does anyone know if there is a scanner to plug-in 5.0 MerCruiser fuel injection to see what my problem could be
 
SeaRay Smitty said:
Good morning does anyone know if there is a scanner to plug-in 5.0 MerCruiser fuel injection to see what my problem could be
Click to expand...

Try increasing the throttle a little a see if it still stalls. If it runs without stalling at a higher RPM you probably want to look at the IAC Valve. If it is the IAC they are usually a simple and relatively inexpensive DIY fix.

-Kevin
 
Need more information on your application. Year, hours, salt or fresh water, outdrives or inboards, last tune, type of fuel injection mpi or throttle body, etc.
 
There is a Rinda scan tool designed to work with your ECM-555 (if that's what you have ...)
 
He probably has a mefi 3 but that same tool will work with a different attachment for the plug
 
Thank you guys I will try it
 
KevinC said:
Try increasing the throttle a little a see if it still stalls. If it runs without stalling at a higher RPM you probably want to look at the IAC Valve. If it is the IAC they are usually a simple and relatively inexpensive DIY fix.

-Kevin
Click to expand...
Thanks Kevin I tried to replace the IAC and it’s still doing it is there anyway to test that to see if that lAC Is getting power to it
 
SeaRay Smitty said:
Thanks Kevin I tried to replace the IAC and it’s still doing it is there anyway to test that to see if that lAC Is getting power to it
Click to expand...

Maybe this link will help with diag on an IAC:
https://toolsgalorehq.com/measurement-tools/multimeter/how-to-test-iac-with-multimeter/

But if you replaced it with a good IAC then I would probably look elsewhere ("New" does not equal "Know Good" - especially with some of the cheap junk available online from China). While the wiring could be the issue and can not be ruled out I would start thinking about other possible causes.

-Kevin
 
Smitty,
This is cheap enough to help ya. I keep one on the boat and thank god i never had to use it. $110 boat buck is a steal
Screenshot_20220527-013511_Amazon Shopping.jpg
 
Wanted to thank everybody for helping me out gave the boat a tuneup and discovered that the distributor cap was soaking wet inside that’s why my boat would not run hopefully this can help somebody in the future
 
Also with IACs, if the wiring is OK they can get barbon'd up and stuck over time. When that happens I've had good results with taking it out, spraying with brake cleaner or electronics cleaner and it's good as new.
 
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