496 Poppin through exhaust
#21
Install new plugs, add methel hydrate to the fuel to get any water out of the system.
And change your water fuel separator filter.
These have saved me in the past.
http://www.offshoreonly.com/forums/g...ome-ideas.html
And change your water fuel separator filter.
These have saved me in the past.
http://www.offshoreonly.com/forums/g...ome-ideas.html
#22
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definetley plugs dont put cheap one in it though. had this prblem in my old baja h2x single 496 mag, and just recently in my 36 outlaw twin ho's just put new plugs in it and it went away
#23
So this started up all over again on the port side, swapped out the same injector that was the culprit last time and all the plugs and fuel filters, and had no improvement, actually the starboard side started doing the same thing, checked spark on all cylinders, did a compression check again, to see if I broke anything, then had it plugged in to a laptop, the program says I'm at 100% power, HA!!! So I sent all the injectors, 8 and 2 "spares" out to be tested and apparently cleaned. While shipping I realized that at $150 a piece, that was a $1500 box I sure hope this works.
Had to vent and if anyone else is having this type of problem I figured I would keep you posted on my progress.
Had to vent and if anyone else is having this type of problem I figured I would keep you posted on my progress.
#24
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Wow thats a a lot of $$ for a test ,how much are they new for a set of 8 ? keep us posted on the outcome , i read all the 496 probs/and fixes and try and store as much imfo as i can on thes motors just in case it happens to me , i want to be ready , some very clever and helpfull people on this site ,its great .
#25
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000joe:
I assume you are still discussing that your 496 engine is popping out the exhaust, or is it just a bad misfire that is something you are hearing out the exhaust when a particular cylinder does not fire like the others.
Usually injectors don't cause popping out the exhaust and a cylinder that dropping out does not make a popping noise as no cylinder pressure has built in that cylinder unless it fires.
Late injector timing could cause exhaust popping but that's pretty unlikely in this engine with its controls.
Is the engine performing with a power loss? Or is it just a noise?
You mentioned that some mechanical mods or redo's were done to the engine, could you describe those in detail as there may be issues with that work?
Best Regards,
Ray @ Raylar
I assume you are still discussing that your 496 engine is popping out the exhaust, or is it just a bad misfire that is something you are hearing out the exhaust when a particular cylinder does not fire like the others.
Usually injectors don't cause popping out the exhaust and a cylinder that dropping out does not make a popping noise as no cylinder pressure has built in that cylinder unless it fires.
Late injector timing could cause exhaust popping but that's pretty unlikely in this engine with its controls.
Is the engine performing with a power loss? Or is it just a noise?
You mentioned that some mechanical mods or redo's were done to the engine, could you describe those in detail as there may be issues with that work?
Best Regards,
Ray @ Raylar
#27
Wow thats a a lot of $$ for a test ,how much are they new for a set of 8 ? keep us posted on the outcome , i read all the 496 probs/and fixes and try and store as much imfo as i can on thes motors just in case it happens to me , i want to be ready , some very clever and helpfull people on this site ,its great .
000joe:
I assume you are still discussing that your 496 engine is popping out the exhaust, or is it just a bad misfire that is something you are hearing out the exhaust when a particular cylinder does not fire like the others.
Usually injectors don't cause popping out the exhaust and a cylinder that dropping out does not make a popping noise as no cylinder pressure has built in that cylinder unless it fires.
Late injector timing could cause exhaust popping but that's pretty unlikely in this engine with its controls.
Is the engine performing with a power loss? Or is it just a noise?
You mentioned that some mechanical mods or redo's were done to the engine, could you describe those in detail as there may be issues with that work?
Best Regards,
Ray @ Raylar
I assume you are still discussing that your 496 engine is popping out the exhaust, or is it just a bad misfire that is something you are hearing out the exhaust when a particular cylinder does not fire like the others.
Usually injectors don't cause popping out the exhaust and a cylinder that dropping out does not make a popping noise as no cylinder pressure has built in that cylinder unless it fires.
Late injector timing could cause exhaust popping but that's pretty unlikely in this engine with its controls.
Is the engine performing with a power loss? Or is it just a noise?
You mentioned that some mechanical mods or redo's were done to the engine, could you describe those in detail as there may be issues with that work?
Best Regards,
Ray @ Raylar
thanks for all the responses guys!!
#30
Figured I would update incase anyone has a similar problem. Sent the injectors, and two old ones to marren fuel injection, in Ct, had them back within a week, found 4 were performing terrible all were dirty, serviced and sent back, I reinstalled last night and changed BOTH (thought there was only one) filters, and went out tonight for a quick blast, boat ran perfect cruised at 46mph at 3500 and touched 64 w.o.t. without staying in it.