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Gas shooting out exhaust

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THEKILLERWHALE

10+ Year Contributor
90
0
Mar 28, 2011
San Diego, California
Okay so I'm spitting gas out my
exhaust.

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From what I read it could just be my walbro pump being overrun but I don't have link yet to adjust

I have an adjustable fuel pressure regulator
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The spray is fuel, the thicker spots are water (a car was being washed next to me and interfered with my picture)

But it only adjusts between 43-48 psi.

So i set about as low as I could.

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Still havin the same problem.


I also having occasional puffs of smoke which I'm thinking, because the engine is brand new, it may just be because the rings aren't completely seated yet.

Opinions?
 
yeah, it was just rebuild, internals and everything are new. its got 700 miles on it.

When did you notice the gas? Is the CEL on? Do you have the stock fuel pump to test out your "theory"? The rings have most likely all ready sealed about 80%. How did you "break in" the engine?
 
i keep it under 4k rpms. low boost. let the vacuum slow me down as opposed to a lot of braking. no i dont have the factory pump. and the CEL is not on. it sometimes stays on at start up because of the RM code because of the 6 bolt swap. i havent gotten link yet to disable the check for that, so i just clear it before startup, but it never comes back on. i noticed the gas couple hundred miles ago, but i didnt put the first 500 miles on it, a buddy did before i had it shipped, so i dont know that it wasnt doing it the whole time.
 
how are you controlling fuel or are you just relying on the afpr to control the extra fuel flow from the bigger pump
 
until i get link (hopefully at the end of the week), then yeah, all i have controlling it is the afpr. is that it? just too much coming from the bigger pump? should i just ignore it and except i cant do anything about it until i get link installed? then just adjust appropriately once i get that?
 
What does the wideband read while this is happening? I would also do a compression check, as running rich on a new engine is an easy way to wash out the cylinders, and prevent a good ring seal from ever happening.
 
thats what i was thinking. if you were getting that much raw fuel out the tail it would shoot fireballs just from the fuel flashing over.

it may smell like fuel even if it is water since there is small amounts of unburnt fuel in the exhaust since the cats and egr stuff are gone im betting
 
okay yeah, it was just water with a bunch of carbon deposits in it. the exhaust just smells like gas, i let some spray on my hand and smelled it. just water.

and i just compression tested it. they were all about 100 and cylinder 1 is 115

and cylinder 4's plug and the tester were wet every time i ran it then took it out. could that just be cause the rings aren't entirely sealed?
 
If it has over 500 miles of run time the compression prob isnt going to get much better and the factory service limit for the low end of compression is 121. so your looking at an issue with the motor, if all your getting is 100-115.
 
Do a leak down test and see where the pressure is leaking out. on a fresh motor rebuild it should be up around 155-170 depending on how tight everything was.
 
Is there any specifications to a compression test maybe I did wrong? I unscrewed the plug, and screwed in the compression tester started the engine. Let it run for like 5 seconds then turned it off and checked the reading. That's it right?
 
You should have all the plugs in the motor and running the car till operating temperature is reached. Then pull one plug out individually and test each individual cylinder. Before testing the fuel pump fuse should be pulled or unplug the fuel pump and then crank the engine over to let excess fuel burn off. Then you can proceed with the compression test and make sure you hold the throttle down all the way wgeb cranking.
 
Is there any specifications to a compression test maybe I did wrong? I unscrewed the plug, and screwed in the compression tester started the engine. Let it run for like 5 seconds then turned it off and checked the reading. That's it right?

Oh goodness. Post of the year! LOL

Do not start the engine with the compression tester hooked up. http://www.dsmtuners.com/forums/articles-engine-fuel/338152-compression-leak-down-testing.html
http://www.dsmtuners.com/forums/art...engine-coolant-compression-testing-video.html
 
Do not start the engine with the compression tester hooked up. Compression and Leak-Down Testing
Engine coolant and Compression testing (video)

Those were the treads i was looking for. thanks for posting. rep given for help
 
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