"Smokey" 351 H.O., anybody!!!!!

[finneri]

1994 omc 351 ho 5.8l. Model # 58FBDPMDA. Smokes mostly on idle, dark smoke. Had it hooked up to a computer, got this readings:<br />Engine running: 116 - 172 - 327 - 538<br />Not running: 327 - 553 - 565 - 542 - 556 - 559<br />Anybody???

 

[finneri]

Re: "Smokey" 351 H.O., anybody!!!!!

The last on not running should be: 558 not 559!!!

 

[Don S]

Re: "Smokey" 351 H.O., anybody!!!!!

Readings of what???????????

 

[f_inscreenname]

Re: "Smokey" 351 H.O., anybody!!!!!

Just a guess. Bad valve seals or bad rings. Again just a guess.

 

[finneri]

Re: "Smokey" 351 H.O., anybody!!!!!

That would trouble codes of the eec iv system!!

 

[olbuddyjack]

Re: "Smokey" 351 H.O., anybody!!!!!

I don't know if the boats are the same as cars but if they are I'll give it a try:<br /><br />Dark smoke would indicate a rich mixture so the only one that makes sense is the 116, coolant temp sensor outside of limits. Was the engine warmed up when you did the engine run test? Its odd a code didn't show up in the koeo test.<br /><br />The 172 shows the starbord heated oxygen sensor reading lean all the time. That might have some thing to do with the smoke cept I dont think boats use oxygen sensors, so... I'd count that as a false code.<br /><br />327, evp/dpfe below minimum voltage. Does it have an egr valve? This could give you rough idle or spark knock but unlikely smoke.<br /><br />538 is an operator error, it means you turned the air conditioner on during the test. Hummmm... <br /><br />553, Air management 2 circuit failure. Does it have catylitic converters?...never mind. False code.<br /><br />565, Canister purge solenoid. Do boats use vapor recovery systems? If so it would have to suck a lot of fuel past the charcoal to smoke.<br /><br />542, Fuel pump secondary circuit failure: pcm to ground. And,<br /><br />556, Fuel pump primary circuit failure. These are interesting, if you loose the fuel pump it'll stall not smoke. Was anybody working with the fuel system that could have set these codes?<br /><br />558, evr electrical circuit failure. I think this came up before(327)but I'm still skeptical. Does it idle rough?<br /><br />Please remember these are car code explanations but I think they would be the same. I'll try to find out for sure.<br />Check the plugs for soot, the electrical connections for corrosion and test the coolant temp sensor before replacing it. Even though you got a lot of codes the problem may not be computer related.

 

[finneri]

Re: "Smokey" 351 H.O., anybody!!!!!

olbuddyjack,<br />thanks for you try, it does idle a litle bit rough. Since this engine dont have a bunch of this things, like o2 sensor, egr etc, I presume this readings are for a car, and readings for marine 351 should be two digit readings. So they installed a car eec I guess!! How can I possibly convert this three digit numbers two the correct two digit readings???