Merc Racing 575 SCI running very rough/rich

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10-17-2014, 07:01 PM

#11

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Quote:

Originally Posted by ICDEDPPL

I bought the same MAP sensor but I wanted Mercury quality. I think $400 was a good price on it.

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

10-17-2014, 09:32 PM

#12

mike tkach

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if you want it to run properly you MUST use the origional mercury marine parts.the part # biggus posted will wreak havoc if used on a mercury marine engine.my cousin,s brothers daughters boyfriend tried to use that same part on his 525 efi motor and it would shift into neutral at 1224 rpm.if he tried to rev it higher it speued black smoke and at 2021 rpm it would autoshift into reverse and die.NEVER GET CHEEP AND USE NON MERCURY MARINE PARTS.we all know they know what works best.

10-17-2014, 09:41 PM

#13

donzi matt

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I would only buy the Mercury sensor because there are lots of Mercury sensors out there that have not failed after hundreds of hours. That really says something.

10-17-2014, 09:52 PM

#14

mike tkach

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Quote:

Originally Posted by donzi matt

I would only buy the Mercury sensor because there are lots of Mercury sensors out there that have not failed after hundreds of hours. That really says something.

i agree,hundreds that have not failed out of the thousands sold,pretty good odds!

10-17-2014, 09:58 PM

#15

proboat-wes

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WOW.,this is like watching the Friday night funny movies without the commercials..

10-17-2014, 10:07 PM

#16

TooLateVTEC

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Quote:

Originally Posted by ICDEDPPL

I bought the same MAP sensor but I wanted Mercury quality. I think $400 was a good price on it.

Bro, its $499 on ebay..yours is a knock off!

10-18-2014, 05:23 AM

#17

Vinny P

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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.

10-18-2014, 05:24 AM

#18

Questofpower

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You guys are horrible poor OP probably doesn't even know what is going on here.

. However, it is funny, carry on.

10-18-2014, 05:32 AM

#19

Questofpower

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Quote:

Originally Posted by Vinny P

I didn't see where it was both either, after checking the fuel pump I would check fuel pressure. Had a 500efi this summer ran fine at 2000rpm and up, below that it would load up on fuel cough sputter etc. Bad fuel regulator, pump was putting out around 80psi which is normal but with no regulator it causes bad things to happen. If I remember correctly it is suppose to be around 38-40psi.