Question about 1987 Toyota 4Runner

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Gas mixture Fuel mixture to rich. How do I fix the problem How do you fix the fuel mixture if running to rich

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  • Loei Yang May 11, 2010

    may be a bad air filter.

  • yadayada
    yadayada May 11, 2010

    how about complete info on what is going wrong, is it carb eng? what is the engine size? what have u done to try and repair this issue?

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Loose nut behind the wheel any ideas

Posted on Mar 01, 2012

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I don't know what year you are working with, but I have an 87 that was doing the same thing. I converted the air filter to a K&N system and did away with the old filter box. The problem did not go away. I talked to a Toyota specialist and he told me in the top of the mass flow sensor there is a plug that you need to drill out. There is an adjustment screw that regulates the air mixture with the gas. It is located on top of the mass air flow sensor that connects to your air filter box.

Posted on Aug 28, 2009

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I got my carburetor problem fixed but now it runs for a while then starts backfiring it'll shut off let's set for a couple seconds and start right back up can anybody tell me why


That sounds like a fuel/air mixture problem.

Just to confirm .. it is a carburettor, not fuel injection?

As a general rule of thumb (with carburettors..) if it backfires through the exhaust/muffler .. the fuel mixture is too rich.

If it backfires through the carb/air filter, the mixture is too weak.

It could also be a 'sticking' float in the carb.

When an engine is cold the fuel is rich .. lots of fuel .. that's how a choke works.. However, when the engine warms up a rich mixture causes problems. The car may splutter and stall, run sluggish or cut out.

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How do I adjust the fuel mixture on the ford 460 efi


The mixture is not adjustable.
You have fuel injectors that are controlled by the computer.
If the check engine light is not on, I would look for a fuel pressure problem or a leaking injector.

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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.

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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.

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2 Answers

I have a 2001 Santa Fe and I took it to auto zone and they put it on this plug in device Alto see why KY check engine light stays on and it said system running rich. What does that mean?


A guy who was selling pizza or delivering news papers last week put a 30 dollar toy on your car and he tells you it is running rich.

I would take it to a trained tech who can put a 4000 dollar diagnostic computer on it, and if he agrees then pay him to adjust the mixture or fix the cold start enrichment circuit to make the rich running go away. running rich means you have too much fuel in the fuel and air mixture being introduced into the combustion chamber. you are wasting gas just for starters.

a guy who has even a little tech training, who works on those engines all the time and has access to the technical bulletins and recalls is worth the cost.

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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.

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2 Answers

My car always smells like gas. The fuel filter was recently replaced.


Hi.

Check the fuel cap. It is often responsible for the problem. ICheck for leaks at the fuel pump, charcoal canister and throttle body. If there is no leak, then the fuel smell may be given by a too rich mixture. In that case you often have more problems because of engine flooding. Try doing a code scanning and see if there is any code stored (e.g. rich mixture, misfire, or indications of other problem. If problem is rich mixture you will smell gas at the exhaust. If mixture is too rich, check the sensors in the air intake (MAF, IAT) and temp sensor. If the problem is none of the ones I mentioned, check the EGR system. Recirculated gas smells the similarly to liquid fuel.

Regards.

Ginko

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2 Answers

The engine has to much gas running into it and is causing it to stall when put in idle and runs rough.


Seems that the fuel pressure regulator is bad, place a vise on the fuel return hose and if the car runs well replace the pressure regulator.

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2 Answers

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1 Answer

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