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Verado Burning More Fuel Than NORMAL! NEED HELP!

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Verado Burning More Fuel Than NORMAL! NEED HELP!

Old 09-19-2010, 01:52 PM
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Default Verado Burning More Fuel Than NORMAL! NEED HELP!

My right hand motor is burning way too much fuel. At Cruise its burning about 1.5-2GPH MORE than the Left hand motor. After a Full day of fishing/trolling the Right hand motor burns approx. 6gals more. I can understand .5-1gallons more, but 6 GALLONS????

Year: 2005
Make: Verado 250's
Hours: 515

ALL updates have been done.

I also got my Used Oil Analysis back from Black-stone Labs and they told me that the Righ Handt motor(that burns more fuel) had 5.3% of Fuel Dillution on the oil.

Does anybody know a Permanent FIX to this? I had it in a local shop and they ran ALL the codes ETC...And found nothing to figure out why its burning MORE FUEL. I also got my props labbed & balanced @ 500hrs and still no change in fuel burn.
Old 09-19-2010, 02:29 PM
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We had a similar problem with a 175hp Honda. It turned out to be a faulty O2 sensor if I remember correctly.
Old 09-19-2010, 03:09 PM
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Fuel in the oil sounds like piston rings, do a compression check.
Old 09-19-2010, 03:32 PM
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Bad O2 sensor making it dump more fuel and causing your oil issue as well.
Old 09-19-2010, 03:34 PM
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Swap the coils to the other engine and see if that causes the issue to jump.

Also check to make sure that engine is straight on the tie bar. 1 inch toe in or toe out will cause much higher fuel burn.
Old 09-19-2010, 03:56 PM
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Originally Posted by captbone View Post
Swap the coils to the other engine and see if that causes the issue to jump.

Also check to make sure that engine is straight on the tie bar. 1 inch toe in or toe out will cause much higher fuel burn.
I will try to swap the pencil coils, tommorow.

I'll look into the tie bar also. But Im pretty sure its a coil. I can see the GPH off even @ Idle while in Neutral(.1 GPH MORE)

Will thise cause the motor not to run smooth at any given RPM? At 700RPM troll mode. the Left Motor runs 690-710rpm but does a pretty good job keeping it at exactly 700rpm, the right motor never gets any amount of time at 700rpm, it usually runs from 680-720ish back and forth.
Old 09-19-2010, 04:14 PM
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Just had a similar issue on my starboard motor, also 2005, around 600 hrs. Pencil coil is my bet for you. Changed pc's and fixed me right up.
Old 09-19-2010, 04:30 PM
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Originally Posted by ReelAddiction001 View Post
Just had a similar issue on my starboard motor, also 2005, around 600 hrs. Pencil coil is my bet for you. Changed pc's and fixed me right up.

Did you change all of them or just a few that were bad.
Old 09-19-2010, 04:40 PM
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Wow, nice to have another engine to compare it to. Do you think you would have known otherwise? Sound like there is no way to test the coils you just replace them?
Old 09-19-2010, 04:58 PM
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You can unplug a coil and you will never know. The computer is so good at hidding a bad coil.

The way that the techs find a dead hole by doing a cylinder drop test at WOT.
Old 09-19-2010, 05:02 PM
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If your camshaft position sensor fails , then the pcm batchfires the injectors instead of sequential. Not necessarily will this show up in MERC's CDS laptop. could be now dumping too much fuel. Bench checking components with MERC's 7 volume factory service manual needs to be used. last time i purchased was about $75. also, check with the guys on VERADO CLUB. Thanks for a reply, David.
Old 09-19-2010, 06:26 PM
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Originally Posted by techdave View Post
If your camshaft position sensor fails , then the pcm batchfires the injectors instead of sequential.
and Guardian System kicks in and limits power to 75%. Doesn't seem to be the case here. Sounds like a coil.

Ray
Old 09-19-2010, 06:36 PM
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Do a compression check...
Get it to a dealer..
Old 09-19-2010, 06:37 PM
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check the thermostats too
Old 09-19-2010, 07:50 PM
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Run ur motor on the hose take the cowling off. As its running unplug the connection from the engine to the pencil coil. If the pencil coil is working right you'll hear a change in the motor like a little studder. Plug the connection back in and go on to the next. If u don't hear a change when u unplug it bad pencil coil. My second from the top cylinder had the bad coil that was causing the problem. Other things to check besides coil is fuel filters, prop, trim, extra weight on one side of boat causing u to deploy one tab more than the other.
Old 09-19-2010, 08:30 PM
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Originally Posted by DrCatcher View Post
Do a compression check...
Get it to a dealer..

Exactly. Lots of people here telling you to do all kinds of things. It could be anything and if you are not a good certified Verado tech you dont know what you are doing. I would also recomend posting this on the veradoclub.com website, it would do a lot more good rather than asking questions here. There are good techs on that site, Charlie is one of them.
Old 09-20-2010, 06:23 AM
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I just changed the bad ones. There were two
Old 09-20-2010, 07:11 AM
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Maybe look into veradoclub.com. Lots of good info there.
Old 09-20-2010, 07:16 AM
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both catcher, and 24-7, he stated he has already had qualified merc techs hook it up to their laptop and check everything. Obviously it has these guys stumped, so he is asking for advice from anyone else that has gone through this.
Old 09-20-2010, 08:04 AM
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A friend of mine had the same issue with one of his Vrods. The dealer replaced some hoses that went to one of the sensors. He showed us the old hoses and they were kinked causing the engine to dump more fuel than the engine could burn. The new ones were much harder and had to be heated up to bend into shape. They did both engines under warranty even though only one had the issue. He had the same issue with the fuel burn/RPM fluctuation plus it would gas you out if the wind was blowing toward the stern. The Vrod tech should know what I'm talking about, if not I'll look at his RO and let you know what they actually call them.

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