backfires in carb. wont run full throttle. water in oil. are the flappers bad?

[Adam13]

I have a 1993 four winns with a 5.0L HO and it backfires in the carb and wont run full throttle without it bogging. I agusted the lean and rich screws on the carb and never backfired again but still wouldnt run full throttle. took it in and they found out that there is a filter in the gas tank that was pluged so it wasent getting all of its fuel. Went and put it in the water and it started up good and went to give it full throttle and did the same thing so i put it in the harbor and was going to take it out and take it back and it wouldnt start it wouldnt even turn over so i checked the oil and it was 1 inch over the safe line. The oil was also really light so i knew it was water. are the flappers bad or what. If so is it an easy fix?

 

[Don S]

Re: backfires in carb. wont run full throttle. water in oil. are the flappers ba

Re: backfires in carb. wont run full throttle. water in oil. are the flappers ba

What engine and drive do you have? Mercruiser, Volvo?<br />Was your oil milky? that would indicate water, not just lighter in color.<br />Sure it wasn't gasoline in your oil?

 

[Adam13]

Re: backfires in carb. wont run full throttle. water in oil. are the flappers ba

Re: backfires in carb. wont run full throttle. water in oil. are the flappers ba

its an OMC Cobra (Ford) 5.0L HO with an OMC Cobra Drive. it was kinda milky. a guy looked at it and said maybe the exaust flappers but he wasent sure so i was just wondering.

 

[Adam13]

Re: backfires in carb. wont run full throttle. water in oil. are the flappers ba

Re: backfires in carb. wont run full throttle. water in oil. are the flappers ba

so what do u think?

 

[vipzach]

Re: backfires in carb. wont run full throttle. water in oil. are the flappers ba

Re: backfires in carb. wont run full throttle. water in oil. are the flappers ba

Water in the oil can come from bad flappers, bad gaskets, cracked manifold, cracked block, bad risers. Are you sure it was water in the oil?

 

[Adam13]

Re: backfires in carb. wont run full throttle. water in oil. are the flappers ba

Re: backfires in carb. wont run full throttle. water in oil. are the flappers ba

yeah i am pretty sure that is what it is what else could it be?

 

[vipzach]

Re: backfires in carb. wont run full throttle. water in oil. are the flappers ba

Re: backfires in carb. wont run full throttle. water in oil. are the flappers ba

You described it as lighter color, milky oil usually looks milky. It will be oil colored with whitish streaks in it. If it was gas, you would be able to smell the oil and it smell like gas.

 

[Adam13]

Re: backfires in carb. wont run full throttle. water in oil. are the flappers ba

Re: backfires in carb. wont run full throttle. water in oil. are the flappers ba

how would gas get into the oil? i could have the guy looking at it right now to check that too. so if water was in there it would look like.......

 

[vipzach]

Re: backfires in carb. wont run full throttle. water in oil. are the flappers ba

Re: backfires in carb. wont run full throttle. water in oil. are the flappers ba

Originally posted by Adam13:<br /> how would gas get into the oil? i could have the guy looking at it right now to check that too. so if water was in there it would look like.......

I described what it would lokk like in my above post.....whitish looking streaks on your dipstick!<br />If your carb was getting too much gas is how gas would get in the oil.

 

[Adam13]

Re: backfires in carb. wont run full throttle. water in oil. are the flappers ba

Re: backfires in carb. wont run full throttle. water in oil. are the flappers ba

well it aint whitish on the dipstick. it is just full over the safe line on the dipstick by 1 inch and no white streaks. i checked the oil before i started it and it was normal the i drove it for maybe 5 min and i cant see how 2 to 3 quarts of gas could have got in there that fast. but maybe u are right. thanks for your help.

 

[vipzach]

Re: backfires in carb. wont run full throttle. water in oil. are the flappers ba

Re: backfires in carb. wont run full throttle. water in oil. are the flappers ba

If you don't see streaks in it then it probly isn't water. Smell the dipstick and let us know what you find out.

 

[Adam13]

Re: backfires in carb. wont run full throttle. water in oil. are the flappers ba

Re: backfires in carb. wont run full throttle. water in oil. are the flappers ba

well i cant do it right now my boat in like an hour away from my house and parked in a harbor because we couldnt get it to start to get it out of the water a guy is going to tow it out for us and take it to the shop to get it fixed

 

[vipzach]

Re: backfires in carb. wont run full throttle. water in oil. are the flappers ba

Re: backfires in carb. wont run full throttle. water in oil. are the flappers ba

Good luck Adam, hopefully it was just fuel getting in there and you can change the oil and enjoy your summer!!!!

 

[Adam13]

Re: backfires in carb. wont run full throttle. water in oil. are the flappers ba

Re: backfires in carb. wont run full throttle. water in oil. are the flappers ba

do u think that it is possiable that when i was trying to park the boat and when it killed in the harbor is when the water got in there and the pistons never turned over after we parked it so the pistons never mixed the oil with the water so it wouldnt look milky because it wasent mixed around witht the oil. that is what my dad kinda said. i am only 14 so i d k for sure but i am just asking just to see what otehr people say.<br />thanks

 

[Sagabu]

Re: backfires in carb. wont run full throttle. water in oil. are the flappers ba

Re: backfires in carb. wont run full throttle. water in oil. are the flappers ba

WOW ! Only 14 and asking questions . I think its great. By the time you become adult, you should be well prepped.<br /> At any rate, the oil will need removed. Take a clear glass and scoop some from the oil and let it sit for a grip. If it is indeed water, it will seperate and the water being lighter the the oil will float on top and be milky.

 

[rbezdon]

Re: backfires in carb. wont run full throttle. water in oil. are the flappers ba

Re: backfires in carb. wont run full throttle. water in oil. are the flappers ba

Adam, it seems very likely the water got into the cylinders (pistons) when the boat killed. This stalling can result in a slight back fire or reverse turn of the engine causing water to be suched into the engine. If this is the case make sure you Dad gets the repair guy to pull all the spark plugs IMMEDIATELY and trun over the engine to force out the water and then put oil in the spark plug holes and turn over the engine again (with out spark plugs). This will prevent the water from rusting the cylinders and ruining the engine. This happens VERY fast if an engine becomes hydrolocked which what the problem may be based on the description you gave. Getting this done may save Dad a ton of money down the road.

 

[Sagabu]

Re: backfires in carb. wont run full throttle. water in oil. are the flappers ba

Re: backfires in carb. wont run full throttle. water in oil. are the flappers ba

If water was coming through the flappers and back up into the pistons, It would likely cause hydrolock. This would be similar to filling the combustion chamber w/cement causing the engine to lock tighter than a frogs behind.<br /> Pull the plugs and inspect for water.<br /> If that much water is in the oil, it could be likely from a failed gasket or crack in the block, waterlog (exauhst manifold), or head.

 

[Adam13]

Re: backfires in carb. wont run full throttle. water in oil. are the flappers ba

Re: backfires in carb. wont run full throttle. water in oil. are the flappers ba

i just hope that it is the flappers that are bad and not a cracked block. the repair guy said since it is an OMC he has to take the manifold off to get to the spark plugs because OMC made those motors sit so low that u can get to them. he said that omc was trying to save clearence or somthing so it will be a little more expensive because of labar because he has to do more work to get to the plugs.

 

[Adam13]

Re: backfires in carb. wont run full throttle. water in oil. are the flappers ba

Re: backfires in carb. wont run full throttle. water in oil. are the flappers ba

does anybody here know any carb settings for that motor (OMC cobra 5.0L HO with a holly carb) by any chance?