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81L HO Crusader Ignition problem

J

job_site

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"I have followed this message

"I have followed this message board for some time and find the topics and advise most interesting. I have not posted a question unil now. I have twim 2004 Crusader 8.1 H.O. engines in my 33' Bertram. The port engine developed a considerable mis-fire last week while fishing for stripers. Limped back to port on the starboard engine. Checked the plugs and found 4 plugs saturated with gasoline, 4 plugs nornmal. Installed the starboard ECM on the port engine and changed plugs. Port engine still only running on 4 cylinders. Installed port ECM on Starboard engine, and it runs fine. I now suspect the coils on 4 cylinders have failed. The coils are Denso, not GM. It doesn't seem probable that 4 coils have failed at one time. Any suggestions as to next steps?

Also, I am having difficulty in finding the Denso coils. Any idea where these can be aftermarket purchased?"
 
"The four coils have not faile

"The four coils have not failed. Are you getting any DTC codes? I would expect that the connector for the coil harness is not securely connected or is damaged.

Denso it GM. They changed the coil during the production period, the variations are determined by the engine SN. The following is the Crusader PN for each version.

R117012 Coil, ignition (OLD STYLE) MPI prior to S/N 621056)and H.O. prior to S/N 630082)

R117013 Coil, ignition (NEW STYLE)
(Standard - S/N 621056 and above)
(H.O. - S/N 630082 and above)

Again, look closely at the coil pack connector. It is fairly easy to swap out the valve cover with the coils still attached if you want to eliminate the coils as a possibility. They have neoprene O ring type gaskets so replacement of the gasket is not necessary.

Good luck,
Rick"
 
Thanks for your advice Rick.

Thanks for your advice Rick. I will check this out this weekend. A loose or damaged connection would be nice to find and correct.
 
I checked out the ignition coi

I checked out the ignition coil wiring harness connections and all other I could find. No problems with them. Took them apart and cleaned connections just to be sure. I could not find the connection for conneecting a trouble code reader. Anyone know where this connection is located? I was going to swap coils but my fingers got too cold and would not function correctly. The temps were in the teens with a 15mph NW wind.
 
It's right there on the st

It's right there on the starboard side of the engine up by the intake manifold about mid-way back.
 
"Thanks Rick, I saw two on ea

"Thanks Rick, I saw two on each engine. One on each side. Glad there are two as there is not much space on the outboard side or between the top of the engines and the cabin deck above."
 
"No, there's only one on e

"No, there's only one on each engine. There are other unused connectors in the harness but only one data connector."
 
It would be ell worth buying t

It would be ell worth buying the Rinda PC based software or I believe they now have a hand held one that can cover even the newer CANDI buss data format that came out I believe in 2006. I have it on my 2007 8.1l and purchased the Rinda software for my laptop which I have captured sever screen shots wit it of various RPMS and loads for future trouble shootinge.

You would probably pay for it on one shop call.
 
"I have the Rinda software but

"I have the Rinda software but had to order the correct connection cable. That should arrive this week, I hope. Everything I have tried is pointing to failed ignition coils. I will let you all know what the software shows."
 
"THe Rinda Hand held code scan

"THe Rinda Hand held code scanner and the data cable came in last week. Started with the hand held.....no faults detected. Connected the laptop with the newly purchased data cable and found that the data cable terminals were not configured correctly! Will contact Rinda today and see if they have the correct data cable. I did change the oil and filter and found the oil to be heavily contaminated with fuel. I suppose the injectors were delivering the full load even though numerous cylinders were not firing. I plan to swap coils this coming weekend. The harnesses are ok, connectors good, resistance testing of the plug wires shows them to be good also. Running out of options."
 
"RPM:

Stick with it and you

"RPM:

Stick with it and you will find the source of richness. Remember, just because a code does or doesn't show up doesn't always mean a given part is bad. Less common in marine aps than the autos but still happens. Also, very few ECU's monitor Everything. if you have no codes set, use the scanner as a monitor and focus on what is NOT monitored."
 
"Fianlly got back to the boat

"Fianlly got back to the boat to continue the work at hand. Rinda software showed no problems or faults codes. Tested ignition coils, all found good. Checked coil wiring harness integrity, found good. Attempted to fire engine, would not start. replaced the cam sensor and crankshaft sensor with the units from the properly running starboard engine. port engine would not fire. Noted a very large amount of fuel being fed to engine as exhaust was flowing raw gas. Engine was flooded. Cleaned and dried spark plugs, waited a period of time, and attempted to fire engine. With throttle wide open, engine fired. Engine would only continue running above 1800 RPM. When throttle pulled back, excessive fuel would flood and stall engine. When running at 1800 RPM, excessive fuel was evidenced in cooling water flowing from exhaust and heavy fuel sheen on the surrounding water. Engine was immediately shut down.

What is causing the excessive amounts of fuel to be fed to the engine through the fuel injectors? Again, the Rinda software shows and report no problems or fault codes.

Any and all ideas are welcome and appreciated. The boating season is drawing near, and I really don't want to spend it on land or working on this problem."
 
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