mhatta
30.04.2021 5:36:48
33-884019 changes to 884019001 Spark Plug $19.50 each
AC 41-932 Platinum
Fits 2001 and newer MCM/MIE 4.3L MPI, 5.0L MPI, 350 Mag MPI & MX 6.2L MPI engines with ECM 555
(s/n 0M3000000 and up)
See full version: 2009 mercruiser 5.0 l mpi spark plugs
33-884019 changes to 884019001 Spark Plug $19.50 each
AC 41-932 Platinum
Fits 2001 and newer MCM/MIE 4.3L MPI, 5.0L MPI, 350 Mag MPI & MX 6.2L MPI engines with ECM 555
(s/n 0M3000000 and up)
33-863622001 Spark Plug $18.90 each
AC 41-983
Fits MCM 496 Mag & HO and MIE 8.1L & HO
33-803991 Spark Plug $15.00 each
NGK BR6FVX (Platinum)
Fits 454 Mag MPI Horizon Gen VI
and 8.2L MIE MPI Gen VI
Choose brandname and start typing model number. [links]
There are 4 replacement spark plugs for Mercruiser 33-816336. The cross references are for general reference only, please check for correct specifications and measurements for your application.
The spark plug Cross references are for general reference only. Check for correct application and spec/measurements. Any use of this cross reference is done at the installers risk.[links]
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Fuel starvation is a more likely cause. While the fuel pressure is good at idle it maybe be dropping off at high rpm where the problem is occurring. I would check fuel pressure at the limiting rpm. Also do you hear any engine knock? here
1997 Maxum 2400 SCR 5.7LX Bravo II more
Manifold Vacuum is 12 in Hg at idle. Goes up to 17 at 2000 rpm. This appears low. Going to repeat the compression test.
Working on this some today, working on the list. Pulled the exhaust elbow, the shutter on both sides look and operate fine. Seems like there is no exhaust blockage.
I see you pulled the elbows to check the exhaust. did you look down the tube towards where the exhaust goes to the outdrive and see the flappers? you mentioned the gaskets but not what you seen down in the lower tubes, and that is where the problem would be found if the flappers was the problem..
Bought the same Brisk plugs 4 years ago and still all of them work without misfiring but due to reocmmended replacement interval, I installed new plugs. It really peps up my old outboard vs factory and NGK plugs.
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