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-   -   Merc Racing 575 SCI running very rough/rich (https://www.offshoreonly.com/forums/general-q/319223-merc-racing-575-sci-running-very-rough-rich.html)

Biggus 10-18-2014 06:51 AM
Originally Posted by SB (Post 4204950)
LOL.

I'm not big on NAPA electronics. I do like most OEM (CHEVY / FORD / GM) electronics.

Here's the automobile applications for NAPA # 2-16865:

Buick Century 1980 - 1980
Buick Lesabre 1980 - 1980
Buick Park Avenue 1996 - 2005
Buick Regal 3.8 L 231 CID V6 1984 - 1985
Buick Regal 1980 - 1984
Buick Regal 1986 - 1987
Buick Regal 1997 - 2003
Buick Riviera 3.8 L 231 CID V6 1980 - 1985
Buick Riviera 1996 - 1999
Buick Skyhawk 1984 - 1987
Chevrolet Monte Carlo 1980 - 1981
Chevrolet Spectrum 1987 - 1988
Chevrolet Truck C1500 1/2 Ton - Pickup 6.5 L 395 CID V8 Diesel 1994 - 1998
Chevrolet Truck C1500 1/2 Ton - Pickup 6.5 L 395 CID V8 Diesel 1994 - 1998
Chevrolet Truck C1500 1/2 Ton - Pickup 1994 - 1996
Chevrolet Truck C1500 1/2 Ton - Pickup 1994 - 1996
Chevrolet Truck C2500 3/4 Ton - Pickup 6.5 L 395 CID V8 Diesel 1994 - 2000
Chevrolet Truck C2500 3/4 Ton - Pickup 6.5 L 395 CID V8 Diesel 1994 - 2000
Chevrolet Truck C2500 3/4 Ton - Pickup 1994 - 1996
Chevrolet Truck C2500 3/4 Ton - Pickup 1994 - 1996
Chevrolet Truck C2500 3/4 Ton - Pickup 1999 - 2000
Chevrolet Truck C2500 3/4 Ton - Pickup 1999 - 2000
Chevrolet Truck C3500 1 Ton - Pickup 6.5 L 395 CID V8 Diesel 1994 - 2000
Chevrolet Truck C3500 1 Ton - Pickup 6.5 L 395 CID V8 Diesel 1994 - 2000
Chevrolet Truck C3500 1 Ton - Pickup 1994 - 1996
Chevrolet Truck C3500 1 Ton - Pickup 1994 - 1996
Chevrolet Truck C3500 1 Ton - Pickup 1999 - 2000
Chevrolet Truck C3500 1 Ton - Pickup 1999 - 2000
Chevrolet Truck C3500HD 1 Ton Truck 6.5 L 395 CID V8 Diesel 1994 - 2000
Chevrolet Truck C3500HD 1 Ton Truck 6.5 L 395 CID V8 Diesel 1994 - 2000
Chevrolet Truck C3500HD 1 Ton Truck 1994 - 1996
Chevrolet Truck C3500HD 1 Ton Truck 1994 - 1996
Chevrolet Truck C3500HD 1 Ton Truck 1998 - 2002
Chevrolet Truck C3500HD 1 Ton Truck 1998 - 2002
Chevrolet Truck Express 2500 3/4 Ton - Van 6.5 L 395 CID V8 Diesel 1996 - 2002
Chevrolet Truck Express 2500 3/4 Ton - Van 6.5 L 395 CID V8 Diesel 1996 - 2002
Chevrolet Truck Express 2500 3/4 Ton - Van 1997 - 1998
Chevrolet Truck Express 2500 3/4 Ton - Van 1997 - 1998
Chevrolet Truck Express 3500 1 Ton - Van 6.5 L 395 CID V8 Diesel 1996 - 2002
Chevrolet Truck Express 3500 1 Ton - Van 6.5 L 395 CID V8 Diesel 1996 - 2002
Chevrolet Truck Express 3500 1 Ton - Van 1997 - 1998
Chevrolet Truck Express 3500 1 Ton - Van 1997 - 1998
Chevrolet Truck G20/2500 3/4 Ton - Van 1997 - 1998
Chevrolet Truck G20/2500 3/4 Ton - Van 1997 - 1998
Chevrolet Truck G30/3500 1 Ton - Van 1997 - 1998
Chevrolet Truck G30/3500 1 Ton - Van 1997 - 1998
Chevrolet Truck K1500 1/2 Ton 4WD - Pickup 6.5 L 395 CID V8 Diesel 1994 - 1999
Chevrolet Truck K1500 1/2 Ton 4WD - Pickup 6.5 L 395 CID V8 Diesel 1994 - 1999
Chevrolet Truck K1500 1/2 Ton 4WD - Pickup 1996 - 1996
Chevrolet Truck K1500 1/2 Ton 4WD - Pickup 1996 - 1996
Chevrolet Truck K2500 3/4 Ton 4WD - Pickup 6.5 L 395 CID V8 Diesel 1994 - 2000
Chevrolet Truck K2500 3/4 Ton 4WD - Pickup 6.5 L 395 CID V8 Diesel 1994 - 2000
Chevrolet Truck K2500 3/4 Ton 4WD - Pickup 1996 - 1996
Chevrolet Truck K2500 3/4 Ton 4WD - Pickup 1996 - 1996
Chevrolet Truck K2500 3/4 Ton 4WD - Pickup 1999 - 2000
Chevrolet Truck K2500 3/4 Ton 4WD - Pickup 1999 - 2000
Chevrolet Truck K3500 1 Ton 4WD - Pickup 6.5 L 395 CID V8 Diesel 1994 - 2000
Chevrolet Truck K3500 1 Ton 4WD - Pickup 6.5 L 395 CID V8 Diesel 1994 - 2000
Chevrolet Truck K3500 1 Ton 4WD - Pickup 1994 - 1996
Chevrolet Truck K3500 1 Ton 4WD - Pickup 1994 - 1996
Chevrolet Truck K3500 1 Ton 4WD - Pickup 1998 - 2000
Chevrolet Truck K3500 1 Ton 4WD - Pickup 1998 - 2000
Chevrolet Truck P30 1 Ton - Step Van 6.5 L 395 CID V8 Diesel 1994 - 1999
Chevrolet Truck P30 1 Ton - Step Van 6.5 L 395 CID V8 Diesel 1994 - 1999
Chevrolet Truck P30 1 Ton - Step Van 1998 - 1999
Chevrolet Truck P30 1 Ton - Step Van 1998 - 1999
Chevrolet Truck Silverado 3500 1 Ton - Pickup 2002 - 2002
Chevrolet Truck Silverado 3500 1 Ton - Pickup 2002 - 2002
Chevrolet Truck Suburban C1500 1/2 Ton 6.5 L 395 CID V8 Diesel 1994 - 1998
Chevrolet Truck Suburban C1500 1/2 Ton 6.5 L 395 CID V8 Diesel 1994 - 1998
Chevrolet Truck Suburban C1500 1/2 Ton 1998 - 1999
Chevrolet Truck Suburban C1500 1/2 Ton 1998 - 1999
Chevrolet Truck Suburban C2500 3/4 Ton 6.5 L 395 CID V8 Diesel 1994 - 1998
Chevrolet Truck Suburban C2500 3/4 Ton 6.5 L 395 CID V8 Diesel 1994 - 1998
Chevrolet Truck Suburban C2500 3/4 Ton 1999 - 1999
Chevrolet Truck Suburban C2500 3/4 Ton 1999 - 1999
Chevrolet Truck Suburban K1500 1/2 Ton 4WD 6.5 L 395 CID V8 Diesel 1994 - 1998
Chevrolet Truck Suburban K1500 1/2 Ton 4WD 6.5 L 395 CID V8 Diesel 1994 - 1998
Chevrolet Truck Suburban K1500 1/2 Ton 4WD 1998 - 1999
Chevrolet Truck Suburban K1500 1/2 Ton 4WD 1998 - 1999
Chevrolet Truck Suburban K2500 3/4 Ton 4WD 6.5 L 395 CID V8 Diesel 1994 - 1998
Chevrolet Truck Suburban K2500 3/4 Ton 4WD 6.5 L 395 CID V8 Diesel 1994 - 1998
Chevrolet Truck Suburban K2500 3/4 Ton 4WD 1999 - 1999
Chevrolet Truck Suburban K2500 3/4 Ton 4WD 1999 - 1999
Chevrolet Truck Tahoe 6.5 L 395 CID V8 Diesel 1995 - 1997
Chevrolet Truck Tahoe 6.5 L 395 CID V8 Diesel 1995 - 1997
Chevrolet Truck Tahoe 1999 - 1999
Chevrolet Truck Tahoe 1999 - 1999
GMC Truck C1500 1/2 Ton - Pickup 6.5 L 395 CID V8 Diesel 1994 - 1994
GMC Truck C1500 1/2 Ton - Pickup 6.5 L 395 CID V8 Diesel 1994 - 1994
GMC Truck C1500 1/2 Ton - Pickup 6.5 L 395 CID V8 Diesel 1996 - 1997
GMC Truck C1500 1/2 Ton - Pickup 6.5 L 395 CID V8 Diesel 1996 - 1997
GMC Truck C2500 3/4 Ton - Pickup 6.5 L 395 CID V8 Diesel 1997 - 2000
GMC Truck C2500 3/4 Ton - Pickup 6.5 L 395 CID V8 Diesel 1997 - 2000
GMC Truck C3500 1 Ton - Pickup 6.5 L 395 CID V8 Diesel 1997 - 2002
GMC Truck C3500 1 Ton - Pickup 6.5 L 395 CID V8 Diesel 1997 - 2002
GMC Truck C3500HD 1 Ton Truck 6.5 L 395 CID V8 Diesel 1997 - 2002
GMC Truck C3500HD 1 Ton Truck 6.5 L 395 CID V8 Diesel 1997 - 2002
GMC Truck K1500 1/2 Ton 4WD - Pickup 6.5 L 395 CID V8 Diesel 1997 - 1998
GMC Truck K1500 1/2 Ton 4WD - Pickup 6.5 L 395 CID V8 Diesel 1997 - 1998
GMC Truck K2500 3/4 Ton 4WD - Pickup 6.5 L 395 CID V8 Diesel 1997 - 2000
GMC Truck K2500 3/4 Ton 4WD - Pickup 6.5 L 395 CID V8 Diesel 1997 - 2000
GMC Truck K3500 1 Ton 4WD - Pickup 6.5 L 395 CID V8 Diesel 1997 - 2000
GMC Truck K3500 1 Ton 4WD - Pickup 6.5 L 395 CID V8 Diesel 1997 - 2000
GMC Truck P3500 1 Ton - Step Van 4.3 L 262 CID V6 1991 - 1991
GMC Truck P3500 1 Ton - Step Van 4.3 L 262 CID V6 1991 - 1991
GMC Truck P3500 1 Ton - Step Van 6.5 L 395 CID V8 Diesel 1997 - 1999
GMC Truck P3500 1 Ton - Step Van 6.5 L 395 CID V8 Diesel 1997 - 1999
GMC Truck Savana 2500 3/4 Ton - Van 6.5 L 395 CID V8 Diesel 1997 - 2002
GMC Truck Savana 2500 3/4 Ton - Van 6.5 L 395 CID V8 Diesel 1997 - 2002
GMC Truck Savana 3500 1 Ton - Van 6.5 L 395 CID V8 Diesel 1997 - 2002
GMC Truck Savana 3500 1 Ton - Van 6.5 L 395 CID V8 Diesel 1997 - 2002
GMC Truck Suburban C1500 1/2 Ton 6.5 L 395 CID V8 Diesel 1996 - 1999
GMC Truck Suburban C1500 1/2 Ton 6.5 L 395 CID V8 Diesel 1996 - 1999
GMC Truck Suburban C2500 3/4 Ton 6.5 L 395 CID V8 Diesel 1996 - 1999
GMC Truck Suburban C2500 3/4 Ton 6.5 L 395 CID V8 Diesel 1996 - 1999
GMC Truck Suburban K1500 1/2 Ton 4WD 6.5 L 395 CID V8 Diesel 1996 - 1997
GMC Truck Suburban K1500 1/2 Ton 4WD 6.5 L 395 CID V8 Diesel 1996 - 1997
GMC Truck Suburban K2500 3/4 Ton 4WD 6.5 L 395 CID V8 Diesel 1996 - 1997
GMC Truck Suburban K2500 3/4 Ton 4WD 6.5 L 395 CID V8 Diesel 1996 - 1997
GMC Truck Syclone 4.3 L 262 CID V6 1991 - 1991
GMC Truck Syclone 4.3 L 262 CID V6 1991 - 1991
GMC Truck Yukon 6.5 L 395 CID V8 Diesel 1996 - 1997
GMC Truck Yukon 6.5 L 395 CID V8 Diesel 1996 - 1997
Isuzu I-Mark 1987 - 1989
Isuzu I-Mark 1987 - 1989
Isuzu Impulse 1.6 L 1588 CC L4 DOHC 1992 - 1992
Isuzu Impulse 1.6 L 1588 CC L4 DOHC 1992 - 1992
Isuzu Impulse 1991 - 1991
Isuzu Impulse 1991 - 1991
Oldsmobile 88 Royale 1995 - 1995
Oldsmobile LSS 1996 - 1998
Pontiac Bonneville 1992 - 2002
Pontiac Firebird 4.3 L 265 CID V8 1981 - 1981
Pontiac Firebird 4.4 L 267 CID V8 1981 - 1981
Pontiac Firebird 4.9 L 301 CID V8 1981 - 1981
Pontiac Firebird 5.0 L 305 CID V8 1981 - 1981
Pontiac Grand Am 2.0 L 122 CID L4 1987 - 1989
Pontiac Grand Prix 3.8 L 231 CID V6 1997 - 2002
Pontiac Grand Prix 1989 - 1990
Pontiac Sunbird / 2000 1985 - 1990
Interesting list but don't think it's accurate. The MAP sensor required has got to be a 2-bar sensor (supercharged or turbo) Those applications above are mostly naturally aspirated. Buick GN would be correct.

cigboat1 10-18-2014 09:56 AM
Hey Dettling, Are You There?????The guys are trying to help you and you don't respond to questions ---------------Duh

tommymonza 10-18-2014 10:06 AM
Originally Posted by Vinny P (Post 4205092)
I don't see where the original post mentioned that both engines have the same problem. If that is the case, as was mentioned, I would concentrate on things that are common to both. Most likely, what I am thinking would not be too probable on both engines. In any case, take a look at the even side of your engine. down in front attached to the seapump is a mechanical fuel pump. It is somewhat common that the diaphragm cracks, sending fuel up that green tube and dumping it in the rear throttle body. That would certainly cause a rich condition.
From OPs original post

I was out on the ocean and was able to run it at higher RPM's but when I got back and brought it to idle, it felt like they were going to stall.

MILD THUNDER 10-18-2014 10:41 AM
Originally Posted by cigboat1 (Post 4205197)
Hey Dettling, Are You There?????The guys are trying to help you and you don't respond to questions ---------------Duh
Considering he's been a oso member for 4 years, and this was his first post, I wouldnt be surprised if he gets back to us sometime around 2018 when he has another boat problem :D

mike tkach 10-18-2014 11:11 AM
my guess is he is at work earning the 300% markup needed to buy the merc parts!

cigboat1 10-18-2014 11:45 AM
He probably did not listen to Mild Thunder either and took the boat back out into the ocean again and is floating around with two dead motors and no radio !!!!!!!!!!

Unlimited jd 10-18-2014 12:09 PM
The aftermarket prob sells the 2 bar sensor as a replacement for all, same scale just extended higher into boost iirc from the lt1 edit program

SB 10-18-2014 01:57 PM
Originally Posted by Biggus (Post 4205108)
Interesting list but don't think it's accurate. The MAP sensor required has got to be a 2-bar sensor (supercharged or turbo) Those applications above are mostly naturally aspirated. Buick GN would be correct.
That's NAPA's direct listing I copied and pasted. Maybe that's why their electronics are not all that dependable. Wrong look-ups. LOL.

sdettling 10-20-2014 11:02 AM
Hey Jim, Thanks for replying. Yes it was both engines. I am having Fast Boats do the work and it was after they did the 100 hr service that these things started happening. They also pulled the plugs after only 30 mins of running and found the were totally fouled. They changed the plugs with NGK R5673-8 and did not do anything to the wires.

Is the ecms the scanner that monitors the engines? If so they did do that and noted all setting were reading correctly.

Any other ideas???

thanks!!!

sdettling 10-20-2014 11:04 AM
Hey Jim,

Yes just able to finally get back online. Sorry all for the delay.....


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