the fuel pressure is 43 for these plus or minus 2 psi. using a quality gauge. Whats your engine serial number ? and whats your latest issues ? I really do not have time to read thru all these posts to see whats going on, sorry about that.
A little info about the MERCRUISER IAC for all the 555 pcms and ecms unless you have DTS - DTS USES NO IAC period fyi info for whomever - anyways the IAC can be tested using the scan tool and montoring the PWM % s. Thats one way to tell if the IAC is going bad or is bad. THE IAC alot of times does not throw a fault code when its going bad or is bad.
Have you ran the engine on a remote gas tank with new gas and new gas line ?
A little info about the MERCRUISER IAC for all the 555 pcms and ecms unless you have DTS - DTS USES NO IAC period fyi info for whomever - anyways the IAC can be tested using the scan tool and montoring the PWM % s. Thats one way to tell if the IAC is going bad or is bad. THE IAC alot of times does not throw a fault code when its going bad or is bad.
Have you ran the engine on a remote gas tank with new gas and new gas line ?