Perfect Pass Issues... semi-long, but def. the problem

jediknight737 · Newbie Joined: 13 Apr 2009 Posts: 8 City: Saratoga Springs

Also posted this in WW... hoping for some knowledge...

Hey Guys~

Thanks in advance on this one. Talking a 2008 Supreme V212 w/ a Merc. Black Scorpion 350. Only 3rd year in H20 as was bought new in 2009.

Put the boat in a couple weeks ago and she just wasn't running right from the dock out... seemed to be fighting to get RPM's... almost stalling thru the 5mph zones. Took it out a few days later and the same thing with a few bursts of running nice, but still just some bad throttle response / issues "muffing" it down. So this past weekend I went to take the boat out and it wouldn't start. Tried for a while, took a break, then it started. Got it out on the water for an hour or two... more issues. Just wasn't running nice. Then we decided to break it down. Plugs were pretty rough. Took cap off and looked to be one of the worst ever. Replaced all plugs, cap, and rotor. Started like a champ. Amazing throttle response at the dock... so it def. needed a tune-up. First time replacing plugs, cap and rotor in 3 years of the boat.

Then... the issues came, but different.

When at the dock just neutral-cruising the RPM's up, it would get to 2,500rpm then come down to 1,000... then back up to 2,500, then down to 1,000... almost like it was cycling thru RPM mode (though the PP was apparently NOT on). Today had a tech over and he ran thru it to double check motor, diagnostic codes, TPS, IAC, intakes, etc.... last test he disconnected the PP... and WHOOLLAA!! It didn't do it. Motor all the sudden was running fine.

Well he then re-hooked it up and took it out and lake tested it... ran fine. Cranking around, no problems, and he even hooked up the Merc diagnostic computer to it... all good, no codes. Nothing. Perfect. Only issue is not the Faria dash speedo is now knocked out as well as the Perfect Pass.

Anyone ever seen something like this? Bad PP module? Tempted to start breaking into the PP but I've never even started to work on one before. Afraid something in that was causing the issues before (and in turn made it run terrible)? Confused to say the least and nervous about messing with the PP.

Again, Thanks in Advance. Any advice?

-D

kartman · Posted: Jun 01, 2011 4:52 pm Post subject:

your process of elimination would lead me to the PP system. give them a call and see what they say.

ridininmd · Wakeboarder.Commie Joined: 16 Feb 2006 Posts: 1231

Very strange, is it a cable throttle or throttle by wire motor?

Also don't start "breaking into" the PP system until you call them, their tech support is second to none. They can walk you through trouble shooting the system if it is the culprit.

shonuff · Criminal Joined: 23 Aug 2010 Posts: 58 City: Atlanta

I'm not convinced its a PP issue. PP can only take away throttle, not add it (for mechanical linkage). It doesn't have the ability to increase engine speed up to 2500 rpm while you're idling around.

If its DBW then I don't know.

kartman · Posted: Jun 02, 2011 7:33 am Post subject:

if you are not at an idle it will do both. other wise how would it increase the speed from 20 to 22. it can also decrease it from 24 to 22. it has almost total controll of the throttle

the only way it could increase engine speed is if he has the set point set way to low, and increased the throttle to get out of the dock, and it was trying to take over. i think its going to be a problem with when it wants to take over as well as a KDW and NN problem. i would perform a system restart and start over.

here is the link for trouble shooting.
http://www.perfectpass.com/troubleshooting/Trouble.Mechanical.pdf

fish6942 · Addict Joined: 22 Feb 2006 Posts: 603

kartman · Posted: Jun 02, 2011 8:25 am Post subject:

fish6942, you are correct.

shonuff · Criminal Joined: 23 Aug 2010 Posts: 58 City: Atlanta

Yeah that's what I meant. Mechanical PP can only reduce throttle and restore it back to original state where the handle is set. It can't add throttle past where the handle is set at.

The reason I said that is because I thought he said while idling around, the engine speed would suddenly jump to 2500 rpm then back to idle. In this case I don't see how it could be PP since the handle is at idle so PP can't increase the engine speed beyond idle.

It would be easy to diagnose either way. While the engine is surging, take a look at the servo, if you see it winding in/out then you know its the PP. This is assuming its mechanical linkage.

ridininmd · Wakeboarder.Commie Joined: 16 Feb 2006 Posts: 1231

pet575 · Posted: Jun 02, 2011 1:51 pm Post subject:

Agreed on talking to PP rather than cracking it open. My experiences with them have been nothing but positive.