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What causes fuel dilution in cat 3516 engines

Loco Engine

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  • martysutherl Jan 04, 2013

    I have changed all Injectors and the problem has come back through oil tests within 3 months

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Posted on Jan 02, 2017

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What is wrong with my 2004 mazda rx8. Cat. Converter was glowing red,running poorly & louder than normal. Changed cat & resinatorpipe but problem persists.


RAW FUEL IS ENTERING THE EXHAUST AND BURNING IN THE CAT. YOU MUST HAVE AN ENGINE MISFIRE ON ONE OR MORE CYLINDERS CAUSING THE SUPPLIED FUEL TO THE ENGINE NOT TO GET BURNED. I WOULD SUSPECT A BAD SPARK PLUG OR PLUG WIRE GIVING YOU TROUBLE AND CAUSING THE ENGINE TO RUN ROUGH AND ALSO CAUSING THE FUEL TO NOT GET BURNED IN THE CYLINDER

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1999 3000gt with DOHV 3l. Running fine then sounds like no oil in engine on startup. Also exhaust smells like raw gas


Raw gas smell may be the culprit of starting noise. Leaky injector(s) could be causing some fuel to enter chambers as you shut off engine, washing oil off cylinder walls and diluting oil. Check fuel pressure key on/engine off and test for gas in the oil.

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Whats causing gas to get in the oil


Older engines had mechanical fuel pumps attached to the side of the engine and driven by a push rod. If the diaphragm in the fuel pump failed, gas could get into the engine crankcase and dilute the oil.

Apr 25, 2015 | 94 95 96 97 98 Chevy Silverado Billet...

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Why does the oil level on my Polaris Ranger increase?


If the oil level is going up then it's possible you have water getting into the oil, perhaps you have a blown head gasket. Have a compression test done immediately.

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Harley fuel valve diagram


The fuel supply valve is a vacuum operated valve under the left side of the fuel tank and it delivers fuel to the carburetor when the handle is turned so it is pointing up in the vertical position (ON) and vacuum is supplied to it from the carburetor. The fuel supply is turned OFF when the handle is in the horizontal position and when no vacuum is supplied to the valve from the carburetor. There is a RESERVE fuel supply and it is operational when the handle is turned to point down. IT SHOULD BE TURNED OFF when the engine is not running because if it is not it is possible for fuel to drain into the engine, dilute the engine oil and
cause engine damage.

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Report code p0430


which engine.?
must be V6?
bank2 failure.
it means that many other tests must be done to find the true cause.
in bar room stool talk.
The rear cat sensor , twitched too much
can be 3 things, cat bad, 02 seneor bad or engine is running
so ratty, it overtaxes the CAT, (or both)


Three way catalyst converter Bank 2
- Exhaust tube
- Intake air leaks
- Fuel injectors may be faulty
- Fuel injector leaks
- Spark plugs may be faulty
- Improper ignition timing
- Engine Control Module (ECM) http://engine-codes.com/p0430_jeep.html

Sep 02, 2013 | 2005 Jeep Grand Cherokee

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Had about 4 gal of diesel in tank and someone put 5 galons of gas in tank. Drove a mile and stopped for not sure how long. Went back out to start and would not start.


it all depends on how much diesel remained in the tank before the gasoline was added, and how new and sophisticated the diesel engine is. In a 2007 or newer clean diesel engine, any amount of gasoline will probably damage the sensitive emissions control components (DPF, OxyCat and SCR) and system. In older engines with much less sophisticated and "touchy" emissions systems, a lightly diluted (say 90 percent diesel/10 percent gasoline) mix would probably pass through with little or no detriment. It might simply cause reduced engine power, perhaps a bit more noise, and possibly a sharp warning from the emissions sensors that detect something other than pure diesel exhaust. It's high concentrations of gasoline that spell real trouble. Whether a modern clean CRD diesel or an old indirect injection unit, burning straight gasoline or highly diluted diesel fuel will almost certainly result in catastrophic damage to the mighty diesel engine.

May 12, 2011 | 2005 Jeep Liberty

1 Answer

Engine fllods with severe oil dilution. Only the


Been my experience with GM 4.3 Vortec the plastic lines to and from the injector crack and cause this problem.There under the intake plenum and allow raw fuel to enter the crank case!
Hope this helped!!
Have a Nice Day!! GMJ

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How much alcohol (% in 87 octane gasoline) can I run in my 1998 Dodge Caravan without installing a conversion kit and without causing harm to the 3.3L engine with automatic tranny. It has 185000 miles and...


The standard 10% ethanol will not cause any harm. Do NOT use E-85 or any more than 15% or you may have problems.

Note: 85 Flex fuel is 85% Ethanol and if you dilute it with 75% gasoline you get somewhere around 21% ethanol. That is a little higher than I would go, but it may not hurt anything. MPG will suffer as you increase the ethanol percentage.

Bob

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2 Answers

Misfire


Sounds like the Catalytic converter needs to be looked at or replaced.

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