bonesmalon

iTrader: (1)

Also had done the test where you pull and block
the vacuum line to the FP regulator at idle and it jumped right up like its supposed to.

BUP

iTrader: (9)

Just a guess have you ever tried lifting your engine hatch while running to see if you can gain rpm's - Just asking.

MAP,or IAT or coolant temp sensor out range can / will make your engine run rich. If you do not know your engine serial #, what year do you have or both of that info ?

did you check your throttle cable and throttle plate for WOT. Are you still running rich - 4 sure ? Your spark plug wires in good shape.

If you pulled your header(s) off couldn't you get to the PCM somewhat easier - just asking. Plus it would be another good reason to pressure test them, at least one side anyways.

bonesmalon

iTrader: (1)

Well Merc engine scan found nothing. Compared data between the two motors and they look damn near identical.

BUP

iTrader: (9)

If you can post your scan results that would be good. Did you test the scan while running WOT ? Next since I see now you have a 2004 year model 525 hp here is the engine serial #s that needed the PCM calibration change.

Engine serial # - 0M950064 and below

I would make sure that this has been completed - triple check because Merc is not always right about it being completed. Another possible thing to try is switch out the 2 coil packs & plug wires from your known good source and see what happens. Weak ignition can make it seem as the motor is running rich when in fact it could be spark / ignition related.

You ran the Buffalo run so maybe you got this fixed - if so what was the problem / fix ? Hopefully it was something simple like prop related. If it could only be that easy & simple everytime out.

bonesmalon

iTrader: (1)

SN is OM901186 Did not run scan at WOT just because of the guys available time. He said he would but weather is so so. I had emailed Merc and they said both my motors had all updates. I will scan and post print outs. He scanned cold, at temp. But all on the garden hose.

bonesmalon

iTrader: (1)

I did run the BPR (pace boat for 70 group) and if you check out the one video there's only one Cat that could run with me. That said I was still having to lean on starboard throttle more than port and wait for it to play catch up.

Had previously swapped plug wire between 4&6 when I was thinking it was single cyl related. Also put new coil pack on that fed #6 with no change.

BUP

iTrader: (9)

Ok had a felling your motor fell under the recalibration. Also I know you were the 70 mph pace boat because at the start we were almost right behind you. I put it together after the fact that your boat and post was this.

On the water hose compared to under load is 2 different stories for these marine engines running. Who is helping you with diagnostics - a repair shop or others. I would look under history from your scan and see if the had any knock sensor faults. At this point I know you said swapping over PCM's was a PITA but maybe is a very good option for testing. .

bonesmalon

iTrader: (1)

BUP ur inbox is full Wanted to discuss my 525

BUP

iTrader: (9)

you can hit my email

put a title on your email so I know who its from.

I will give U my cell if needed. from one NY er to another

[email protected]

BUP

iTrader: (9)

Dave I emailed you back from day one and even Sunday. Seen your email last night if I got yours - I sent another email and sent the original 2 back to you. Did you get them this time out. If not send me your phone # and times to call in a new email and I will get back to you that way. I have no idea why you can not get my emails. Sorry. John