2000 Mercruiser 5.7 Horizon MPI

goodtimes

Seaman
Joined
Sep 17, 2007
Messages
51
Re: 2000 Mercruiser 5.7 Horizon MPI

After we got in from the mechanic.. He said there was intermidiate fault on the IAC. Now the engine idle's very high 1500rpm. So I unplugged the IAC and it idles fine. When i plug it back in it starts idling too high. I'm going to try cleaning tonight.

Is the IAC faulty or this could be caused by a ground or something else?
 

goodtimes

Seaman
Joined
Sep 17, 2007
Messages
51
Re: 2000 Mercruiser 5.7 Horizon MPI

I took it to a different tech and now their telling me that my TPS is reading 99% full throtle(Diacom Scan Tool) and thats why the iac is opening up. He says I would need a new ECM thats worth $1500. I didn't have this issue before I took it to previous tech.

I can't believe this BS...
 

Dshow

Petty Officer 1st Class
Joined
Jan 1, 2007
Messages
313
Re: 2000 Mercruiser 5.7 Horizon MPI

You can buy a Rinda scan tool off Ebay for about $300 that will tell you the reading of most your sensors, i.e. MAP sensor, IAC, TPS, coolant temp, etc... so you could see if any are not functioning. (I haven't found a fuel pressure reading on my scan tool yet, but my TBI has a schrader valve for measuring the pressure...)
 

goodtimes

Seaman
Joined
Sep 17, 2007
Messages
51
Re: 2000 Mercruiser 5.7 Horizon MPI

WOW! What a day yesterday. Called the tech ( Bay Marine, Signal hill, CA) to see what the status is and now he tells me the ECM is going to cost us $2400plus labor, not $1500. So I started asking him questions of why this would happen and if he checked the 5V supply and some other questions that were in the service manual. He brushed me off and gave the phone to some one in the office. This ahole started going off on me and giving all this BS, telling me he has 30yrs of expereience and he never makes mistakes , 100% sure it's the ECM blah blah blah. After giving him a piece of mind, he tells me to pick up my boat. I told him to get the boat ready I will pick it up first thing in the morning. I got a hold of newport_dave on this board and arranged for him to take a look at the boat the next day.

I get there next morning and this ahole started giving me BS again, telling me he was respectful to me last night, I told him to STFU and he calls the cops on me like a little baby.. I guess he couldn't handle the truth. The cops get there and I tell them my situation and the cops agreed with me. He said there is no way he would put up that kind of money without asking questions. My friend goes in to pay the bill and they charged 6hr of labor for diagostics. My friend tells them that is not acceptable and they guy gves him half off. Total of $267. I get on the boat to see if everythig is normal. The shaft was NOT BOLTED TO THE TRANNY, TPS WAS OUT AND PLUGS ON ECM WERE SPLIT. My friend goes back in to till them and he wanted to charge to put them back the way I brought it to him. I was going back in there to give them a little more of my mind but my friend talked me out of it. He knew now it was going to get ugly..

We get the boat and take it to newport_dave. He gets on board and within minutes of scanning he relizes the fuel pressure plug was plugged in the TPS and vice versa. Boom! Our boat is back to normal again. THANKS DAVE.


Well guys... newport_dave saved our boat AND BAY MARINE tried to pull a fast one on us. I guess he figured I knew a little too much (Thanks to all that helped on this board) and would be better off not doing the job.

AGAIN THANKS TO NEWPORT_DAVE FOR FIXING OUR BOAT AND BEWARE OF BAY MARINE.
 

newport dave

Chief Petty Officer
Joined
Nov 21, 2004
Messages
458
Re: 2000 Mercruiser 5.7 Horizon MPI

gt, glad I could help. It was a kind of unusual thing with some misleading symptoms. I actually got to the same point the last guy did where it seemed to be the ECM itself, but then took the next step, confirming wire colors/pin locations at the ECM with the service manual, and found the real problem.

Dave
 

Don S

Honorary Moderator Emeritus
Joined
Aug 31, 2004
Messages
62,321
Re: 2000 Mercruiser 5.7 Horizon MPI

I have learned to always ask "without really asking point blank" if the owner or anyone else has attempted to find the problem. When I see they have, I look for things in the wrong place.
Sorry if that seems like profiling people at an airport, but the more questions I ask, the shorter the troubleshooting time.
 

kingjlopes

Recruit
Joined
Jul 27, 2010
Messages
3
Re: 2000 Mercruiser 5.7 Horizon MPI

Hi Dshow can you please tell me what kind of OBD2 that you use and the adpter to plug and where Iam new to this and I just purchase a Rinker Fiesta V 270 with a Mercruiser 5.7 MPI.I went on Ebay nad look for the Rinda that you mention and cant find it .Thank You
 
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