Question about 1994 Geo Tracker

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Running rich fouling plugs

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Timing is off,belt may have jumped or a bad spot.

Posted on Nov 17, 2013


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Why my honda xl125s produces black smoke and smell gasoline evrytime i rev up

its running rich or the plug is fouled or the plug wire or plug cap is high in resistance. you need an ohm meter to check resistance of wire and cap. the wire should be less than 5-7ohms and the cap less than 10ohms. the running rich you will have to check the carb out for dirt and old fuel varnish build up.

Oct 14, 2015 | Honda Cars & Trucks

1 Answer

Carban fouling

carbon on the plugs is a sign of running too rich (Choke on blocked air filter)). When mixed with oil it can be the sump fumes are excessive indication worn rings. If a 2 stroke it is a wrong fuel/oil mixture. Reduce by running hotter plugs (See plug chart at you spares shop for hotter number plugs)

Jun 22, 2013 | Cars & Trucks

1 Answer

95 GMC 5.7l keeps fouling plugs

Hi Dale,

Several factors can contribute to spark plug fouling:

- The air/fuel ratio may be too rich as a result of incorrect carburetor adjustment or a poorly performing fuel injection system.
- Worn piston rings or valve seals may allow too much oil to leak into the combustion chamber, leading to oil fouling.
- The ignition system may not be performing properly.
- Prolonged idling or continuous low-speed driving may keep the spark plug from reaching its optimum operating temperature. Using too cold a spark plug can lead to the same problem.
- A dirty air cleaner can create a too-rich condition which can lead to fouling.

Have each of the above checked and corrected.

Fuel, oil and carbon fouling can all be the result of different causes but, once a spark plug is fouled, it will not provide adequate voltage to the firing tip and that cylinder will not fire properly.

In many cases, the spark plug cannot be cleaned sufficiently to restore normal operation. Hence, I always recommend that a plug be replace, once it becomes fouled.



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Nov 02, 2011 | 1995 Chevrolet K1500

1 Answer

Bad idle

It's probably not the throttle position sensor, but rather the wiring that goes to the sensor. Also your plugs or plug should not be black unless it is oil fouled or carbon fouled. Carbon fouled would indicate an over rich mixture problem. Wet and black would indicate oil fouling. You need to check the oxygen sensor also. A false indication from it would could cause a rich fuel condition. Start with the wiring to the TPS switch. Last but not least check your map sensor and the vacuum hose running to it. All these items contribute to the overall fuel delivery system and how it functions.

Aug 17, 2009 | 1993 Ford Ranger SuperCab

2 Answers

Runs rough and keeps fouling out new spark plugs

sounds like too rich of a mixture check for vacuum leaks and check fuel press regulator

Apr 23, 2009 | 1996 Mazda Millenia

1 Answer

Flooding and fouling plugs

Running too rich..Not sure exactly what the problem is. Might be best to buy a repair book and look it up on there..they have them at the library or you can get one online here.

Jan 16, 2009 | 1988 Ford F 150

1 Answer

Fuel /emmision

If it ran extremely rich for months and now it won't start, the spark plugs are fouled out. Replacing them will fix your problem -- temporarily.

You'll probably want to check the O2 sensor(s) and replace them as they are probably the cause of the car running extremely rich.

May 15, 2008 | 1999 Chevrolet Venture

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