Question about 1993 Ford Ranger SuperCab

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Intake air wrong temp, fuel mixture too rich - 1993 Ford Ranger SuperCab

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Have you replaced the air temp sensor??
these are also known for the idle air control valves to go bad!!

Posted on Jun 26, 2009


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SOURCE: rich fuel mixture at idle, smoke from exhaust,

change the O2 sensor/s and the mass airflow sensor

Posted on May 12, 2010

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Mine 96 cobra starts great in warm weather ,let it get 40 or below it will turn over and over,never gets fuel to fire it up,hit it with starting fluid in air flter it fires right up,,what could be the...

There's a shutter valve to restrict air flow either before or after the air filter housing. In cold winter, this valve is closed as you start up the engine. As the engine area warms up, the shutter valve opens up to allow more air to flow into the intake manifold. In close position, the restriction in air flow results in rich fuel mixture. When its open, the fuel mixture is leaner. If it were locked in open position, you crank the cold engine and you get a lean mixture instead of a rich mixture to start up in cold mornings.

Nov 29, 2013 | Cars & Trucks

2 Answers

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


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.



Aug 04, 2011 | 2003 Saturn L-Series

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I have 1993 pontiac bonnevile, it will not pass emissions the nox levels are to high this is the fourth try. what can i do. also my check engine light comes on as well.

high NOX indicates your engine is running high combustion temps. Two of the major reasons for lean mixtures are intake leaks and clogged fuel injectors. The reason the engine computer cycles between rich/lean when running is because the cat needs lean mixtures to deal with HC and CO and a rich mixture to deal with NOX. If you are running lean the cat can't lower your NOX. I would first get your fuel injectors flushed and de-carbonize your intake/combustion chambers.

May 31, 2011 | 1997 Pontiac Bonneville

1 Answer

Choke not working, will not Idle when cold

First, your engine has fuel injection and has no choke. In a carbureted car, the reason there is a choke is to restrict air flow in order to change the mixture of air and fuel entering the engine. Since fuel flow cannot be easily altered you just limit the amount of air going in, resulting in a rich mixture.
In an injected engine, air flow remains the same and additional fuel is added by keeping the injectors open longer.
The computer gets information from several sensors in order to know when the engine is cold or hot, or, to know what the outside air temp is. The sensors that are primarily responsible for that are the coolant temp sender and the intake manifold air temp sender. However, the coolant temp sender cannot work properly unless you have the correct thermostat installed (195 degree (f)) But, generally that helps more in making it run correctly after it's warm.
Therefore, check or replace the coolant temp sender and the intake manifold air temp sender.
Testing can be done using a digital multi meter following instructions found in either chiltons or haynes manuals,
Also make sure spark plugs, ignition wires and the cap, rotor, and coil (if you have them) are in good condition as when cold, any moisture or condensation on ignition parts can cuase spark bleed off and make the engine run poorly as well.

Nov 28, 2010 | 1999 Jeep Cherokee

1 Answer

Rich fuel mixture at idle, smoke from exhaust,

change the O2 sensor/s and the mass airflow sensor

Oct 10, 2009 | 1991 Volkswagen Corrado

1 Answer

The truck will turn over the fuel pump comes on but the truck will not crank up

Suspect engine coolant sensor. ets up a rich fuel mixture like the old cars needed to start. The intake air temp works with the coolant sensor Good Luck, Ned

Sep 27, 2009 | 1994 GMC Jimmy

2 Answers

99 boxter p1128 and p1130. replaced air mass sensor. no vaccum leaks

Remove the MAF sensor and carefully clean the sensing diodes with some solvent and a q-tip. These codes are commonly caused on this car by a dirty MAF that does not see the air entering the engine so fuel is not added by the computer. Then the computer sees that the mixture is lean by looking at the exhaust gas oxygen (sensor) content and it sets a code because it can't trim fuel delivery to the correct level as the MAF signal has more authority.

Jul 07, 2009 | 1999 Porsche Boxster

1 Answer

1993 Hyundai Excel motor runs very rich fuel mixture at idle and at all speeds. Fuel injected.Stalls easily at idle.Black smoke out of exhaust.Have replaced temp sensor to no avail.

sure he has an ecm installed .. its an injection based car.. probably air filter isn't that good .. also check if air intake pass is clear of any wastes

Apr 27, 2009 | Hyundai Motor 1993 Excel

1 Answer

94 Automatic Geo Metro 3 Cyl. Map Sensor - EGR Valve

Unfortunately, both of these items are equally important and repairs can't normally be avoided by taking care of your car.

Your MAP (Mass Air Pressure) Sensor measures intake manifold vacuum pressure to help control the air and fuel mixture and timing. It contains a pressure-sensitive element that connects to an electronic circuit, generating a signal that changes with pressure changes in the manifold.

Your EGR (Exhaust Gas Recirculation) valve recirculates exhaust gases through the intake manifold to be burned again, cooling peak combustion temperature. Dilutes the air and fuel mixture to keep the nitrogen oxide emissions within breathable limits. And yes, it could very well be that the EGR solenoid that is causing the issue.

Both units effect your vehicle's fuel/air mixture. This is important because your vehicle running lean/rich can cause "snowball" problems. For example, a faulty EGR can cause the vehicle to run rich/lean. If not repaired, in time, the exhaust caused by the wrong rich/lean fuel mixture can damage the O2 sensors and/or catalytic converter.

If I had to pick, I'd start with your MAP Sensor. One guess I would have is that your MAP Sensor failed and made your vehicle start burning the wrong fuel/air mixture. Assuming I'm right, this could have damaged the EGR Valve. So, I see no reason to replace the EGR Valve alone, just so it too can be damaged by the poor fuel/air mixture caused by the still-faulty MAP Sensor. If your lucky, you may see the faulty EGR code disappear once your MAP Sensor is replaced.

Hope this helps and good luck!

Aug 18, 2008 | 1994 Geo Metro

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