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Fuel too rich - 1986 Nissan Stanza

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Check fuel pressure, possible bad fuel regulator

Posted on Feb 05, 2010

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I have a 4.9l engine surges at idle running way to rich and miss. at higher rpms .I changed fuel filter spark plugs . what can it be?


How do you know it is running rich? The computer controls fuel delivery. If it is running rich, one or more sensors may be giving the computer false readings resulting in a rich mixture. A leaking fuel pressure regulator internally will also cause a rich issue as well as a stuck open EGR valve. A scan test monitoring engine data can inform you of what may be the trouble

Dec 19, 2015 | Cars & Trucks

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P0172 sensor system to rich


Correct, code 172 is fuel system too rich bank one.
This means the computer is trying to cut back on the fuel going thru the injectors and according to the O2 sensor it is still rich.
Could be a faulty sensor, or a leaking injector, or fuel pressure regulator.

Aug 26, 2012 | 2003 Suzuki Vitara

1 Answer

I have the 305tpi and its running rich.the guy that owned it before i did eliminated the o2's...i'm just starting to put money ikt and i want to fix this running rich problem i have...what wou


well replace oxygen sensors that would cause engine to run rich if you remove or disconnect them oxygen sensor control fuel system it will cause engine run rich open loop mode on cold engine start ups as engine warms up it will go closed loop cause leaner fuel mixture.if you replace oxygen sensors could help rich fuel problem if not you could have intake manifold leak or faulty fuel pressure regulator.

Jan 24, 2012 | 1987 Chevrolet Camaro

1 Answer

2002 pt cruiser code p0172


DTC P0172 - P0172 Fuel Trim System Rich Bank 1... this indicates that the fuel mixture is too rich, but you already know it is running rich.

A rich fuel mixture can be caused by a number of things First, I would suggest checking fuel pressure to make sure it is within normal specs If fuel pressure is too high due to a faulty pressure regulator for example, it will cause too much fuel to be entering the engine.

A leaking fuel injector can cause a rich fuel mixture, as can an injector that is stuck in the open position. When the engine is shut off, monitor fuel pressure with a fuel pressur gauge; it should remain steady.If fuel presure drops when the engine is off, then removing the fuel rail and injectors while still connected to the lines to visually check for a dripping injector may be informative.

There are several engine control system problems that can cause a rich fuel mixture; if you can obtain a scan tool that is capable of displaying live engine data you can check for these possible causes:

1) Low MAP reading; this can be due to a fault in the MAP sensor, MAP circuit, or as a result of low engine vacuum due to a restricted exhaust, jumped timing belt, or low compression on one or more cylinders caused by valve leakage or a leaking head gasket. Compression testing the engine may reveal internal mechanical problems of this type that would cause low engine vacuum. A low engine vacuum reading from the MAP makes the computer think the engine is under heavy load such as during acceleration, so it commands a rich fuel mixture in response. A vacuum leak can also result in a rich mixture for the same reason.

2) Low coolant temperature signal. This can be caused by a fault in the coolant temperature sensor circuit, faulty coolant temperature sensor, low engine coolant level, or a faulty thermostat that is allowing the engine to run too cold.

Keep us updated.

Oct 03, 2011 | 2002 Chrysler PT Cruiser

1 Answer

Exhaust pipe is blowing out a mist of black smoke


BLACK EXHAUST SMOKE IS A RICH FUEL MIXTURE.CAUSE BY WEAK SPARK IGNITION, FAULTY MAP SENSOR CHECK MAP SENSOR VACUUM HOSE AND ELECTRICAL CONNECTOR BECAUSE BAD MAP SENSOR WILL CAUSE RICH FUEL MIXTURE CHECK THE VACUUM LINE GOING TO FUEL PRESSURE REGULATOR, MAKE SURE FUEL PRESSURE REGULATOR GETTING VACUUM AT VACUUM LINE IF NOT LOOK FOR BROKEN OR DISCONNECTED VACUUM LINE TO FUEL PRESSURE REGULATOR, CHECK FUEL PRESSURE REGULATOR VACUUM LINE IF YOU SEE GASOLINE IN VACUUM DIAPHRAM TO FUEL PRESSURE REGULATOR REPLACE FUEL PRESSURE REGULATOR,CHECK THE EVAP CANISTER IF GAS SOAK IT WILL CAUSE RICH FUEL MIXTURE.

Aug 05, 2011 | 1995 Chevrolet Blazer

1 Answer

Have code p1132 - HO2S11 switches sensor indicates rich. What does this mean?


Rich is referring to your Air/Fuel ratio. Lean is too much air not enough fuel, Stoic is perfect balance between the two, Rich is too much fuel not enough air. Means more than likely you have an 02 sensor that is out.

Aug 04, 2010 | Ford Taurus Cars & Trucks

1 Answer

Running rich its has new plugs the fuel press reg


MANY THINGS CAUSE RICH FUEL MIXTURE.FUEL INJECTORS.MASS AIR FLOW SENSOR AND BAD OXYGEN SENSOR.

May 24, 2010 | 1996 Nissan Maxima

2 Answers

Running rich, smelling rich


You may have a bad fuel injector or in need of a tune up badly. The early fuel injection (throttle body) had a single fuel injector that would clog and not spray fuel in a mist but would dump fuel. Does it run rough at idle? That is a good indicator. Some are rebuildable but I would suggest replacement. If you have not had a tune up in a while that should be done too.

Jan 24, 2010 | 1994 Pontiac Grand Prix

1 Answer

1992 Ford F250 - fuel injected motor - running too rich


you cant adjust fuel on the ford governor its fixed.you can adjust fuel on cummins governor.have your governor injection timing check .make sure air filter not stopped up or restricted.it will cause it to run rich.

May 16, 2009 | 1999 Oldsmobile Alero

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