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2005 Volvo Penta 8.1 gxi - ecm issue

A

Aaronandjenny

New member
Any help would be appreciated!
I have a constant misfire on #5 cylinder.
Checked all the wires going to the emc, all check out good.
Replaced coil pack ,wire, and plug. Swapped coil pack, wire, and plug with one that is working.
Spark plug is wet after running for a few seconds. Will not get over 4000 rpm.
The boat is on Grand Lake O' the Cherokees in Oklahoma.
Only other issue has only happened twice in the last month. Running the boat and it acts like You just pulled the kill switch, switch batteries to off and on again, everything is fine, except for the #5 plug not firing.
Thank You!
 
Welcome

Looks like you have a bad connection or ECM

Each injector has a designated wire from ECM, Trace your wiring
 

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Found new in box Delphi ones through Walmart. Which I am sure is from an aftermarket seller. Seems Walmart is trying to compete more and more with Amazon. Have had good luck so far with things ordered through them. Thanks,
 
Amazon and Walmart is the middle man and takes a percentage of every sell. They both use sellers which are not vetted. Buddy bought a new fish finder and was sent a tracking number. Box arrive and had a small cable in it and no finder. Took months to clear it up
 
Took a month (no s) my mistake
Basically seller said I sent the item and here is the tracking number
Buddy said I received box but it was not the finder

Final thing was Buddy called his credit card company and disputed the charge and got his money back
 
I might want to look inside that cylinder with an inspection camera just to make sure there isn’t a coolant leak causing the misfire.
 
I learned that watching Eric O on South Main Auto you tube, he used that camera to spot coolant leaking in a Honda CRV cylinder, apparently blown head gaskets happen on them fairly often.
On my 4.3 I started having a bad misfire, reluctance to start, and I just grounded the coil lead, removed the spark plugs and cranked the engine over. Sure enough water shot out of cyl #2. Blown head gasket. Repaired with new gaskets, cyl head bolts and reman cyl heads (originals were cracked from an overheat a few years earlier).

I would always do a compression test, leak down test (if possible) and cylinder inspection with the camera (easy now they are not that expensive) before touching the EFI system.
It's not that uncommon on marine inboards, they are under heavy load all the time and Volvo exhaust gaskets are known for leaking down into cylinders, especially the center ones. In fact I use that same camera to look inside the exhaust elbows to make sure they aren't leaking, very easy takes like 10 min (remove a plug on the top of the elbow, the camera wand fits right inside). Here's a pic:
exhaust staboard side.jpg

no leaks!
 
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