Gas In The Oil

[BlackLX5.0]

Well I just got my car back together and I was going to change the oil and it had gas in the oil. What could be causing that?

Thanks

 

[speedytang]

That is called Blow-By. You have a weak cylinder and the gas is passing past the rings.

 

[Euphoric306]

yup, add another rebuild to your future mods list

 

[Roland69]

You could go to wallmart and get some compression in a can it's about 6 bucks a can but worth every penny. J/K you have a weak cyl.

 

[69Rcode_Mach1]

Yep somewhere your rings are not sealing. Go to Autozone and rent a compression tester, check all the cylinders and see which ones are out of the norm.

 

[Roland69]

I would just buy one they are only like 20 bucks and real handy to have.

 

[69Rcode_Mach1]

I was giving him the poor mans method, which I have used many times.

 

[Roland69]

How much is it to rent one

 

[69Rcode_Mach1]

Free, you just put a deposit, and they give it back to you when you return it. You can take it to any store too, doesn't have to be the same one, they just want their tool back. That is one of the only things I use autozone for, is tool rentals.

 

[Roland69]

That is like Canadian tire here but ours sucks and dosnn't have any tools left that are any good.

 

[jrichker]

Gas in oil:
1.) Leaking injector. Find which one by doing a cylinder balance test.
Fuel pressure OK, the injectors are not firing, OR one or more injectors stuck open

Do a cylinder balance test: Warm the car's engine up to normal operating temperature. With the Engine Off, Key OFF, use a jumper wire or paper clip to put the computer into test mode. Here's the link to dump the computer codes with only a jumper wire or paper clip and the check engine light, or test light or voltmeter. You’ll need it to do the cylinder balance test

See http://www.troublecodes.net/Ford/
OR
See http://www.dalidesign.com/hbook/eectest.html for more descriptive help
OR
See http://www.mustangworks.com/articles/electronics/eec-iv_codes.html

Start the engine and let it go through the normal diagnostic tests, then quickly press the throttle to the floor. The engine RPM should exceed 2500 RPM's for a brief second. The engine will shut off power to each injector, one at a time. When it has sequenced through all 8 injectors, it will flash 99 or the number of the failing cylinder such as 22 for cylinder #2. Quickly pressing the throttle again up to 2500 RPM’s will cause the test to re-run with smaller qualifying figures. Do it a third time, and if the same cylinder shows up, the cylinder is weak and isn’t putting out power like it should. See the Chilton’s Shop manual for the complete test procedure

The red wire on each injector is powered up whenever the ignition switch is in the Run position. The computer provides a ground to complete the circuit and fire the injector. The injector must have a ground to squirt fuel on command. A short to ground in the injector return wiring can cause one or more injectors to be continually open or triggered

A.) A Noid light available from Autozone, is one way to test the injector wiring. If the light stays on constantly, either the wiring has a short to ground or the computer has failed

B.) I like to use an old injector with compressed air applied to the injector where the fuel rail would normally connect. I hook the whole thing up, apply compressed air to the injector and stick it in a paper cup of soapy water. When the engine cranks with the ignition switch on, if the injector fires, it makes bubbles An injector stuck open will release a continual stream of bubbles. Cheap if you have the stuff laying around, and works good too. The same trick works great to find leaking injectors too.​

The wiring for the injectors may have some bare spots in it causing the injector to computer control wire to ground out. This would cause the injector to remain on anytime the key was in the Run position. Remove the injector wiring connectors from the injector. Note that each injector has one red wire for power and a non red wire (wire some color other than red) for computer controlled ground. With the key off, disconnect the computer connector from the computer. Use an Ohmmeter between the non red wire and ground. You should see more than 100000 (100K) ohms resistance.

See the following website for some help from Tmoss (diagram designer) & Stang&2Birds (website host) for help

Using the above diagram, check the resistance between the injector and the computer. Clean and check the 10 pin connectors since they are a potential trouble source. Any resistance greater than 1 ohm between the injector to computer wire and the matching pin on the computer connector is a problem.

See http://fordfuelinjection.com/?p=6 for more help

2.) Ruptured diaphram in fuel pressure regulator. Remove vacuum line from regulator and inspect for fuel escaping while pump is running.

 

[stangjunkie]

jrichker... this was a little vauge could you explain a little more... j/k wow that was great!! yet another post that will be saved on my comp for later use

 

[86bluecobra]

i was going to say that i was getting gas in my oil because by carb was continuing to put fuel in after car was shut off. I believe they call this washing the cylinders and its a bad thing. perhaps a jrich says you have a injector doing the same thing.

 

[Black1987Stang]

I was going to say possibility of leaking injector, but Jrichker beat me to it, I would do a compression test, see what u get

 

[BlackLX5.0]

Thank for all the help everyone. The compression is fine & its not a weak cylinder.

 

[vristang]

Wow, you may have gotten lucky and found a bad problem before it destroyed the motor.

I would look very carfully at the injectors now.
jrichker to the rescue once again.

 

[Brians89GT]

That just means you were long overdue for an oil change