Question about 1987 Isuzu Trooper

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Plugs with carbon, rich exhaust Trooper

I just replaced plugs and wires in my 1987 Trooper. Hoping to solve misfire and extremely fuel rich exhust. The old plugs have lots of carbon deposits on them, so I'd think it would be an O2 problem. Problem is I don't know what that means in an 1987 Trooper. Kinda learning as I go... P.S. The wires I took off were 8mm the ones checker sold me were 7mm, he insisted he was right. Was he, truck runs no better and no worse than before... Thank YOu!!

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  • yadayada
    yadayada May 11, 2010

    has the carb been replaced? if not do that, the carb is the problem.

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Adjust the valves. .006 for intake, .010 for exhaust makes a huge difference.

Posted on Apr 18, 2009

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Is the porcelain "cracking" or are they getting "carbon-tracked"? (see example photo of carbon-tracked plug below).
It is common for carbon-tracking to occur if your original plugs were carbon-tracked and you replace the plugs without replacing the wires. If the plug is carbon-tracked, the boots on the wires or the coil boots (coil-on-plug ignition) are also carbon-tracked. If you do not replace the wires or the coil boots, the ignition will still misfire by following the carbon-track on the inside of the boot. This will cause your new plugs to also be carbon-tracked within a short period of time (days or weeks).

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1987 Nissan 200SX cranks but hard to start


Thats a classic sign of having your engine run too rich. That puffy layer of ash is carbon which means your engine is not burning gas properly or completely which means is misfiring thats why the car is shaking. Try having your oxygen sensors checked and make sure you are using good fuel.

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I have an upper (or lower, not sure) valve train problem. Cylinder #5 misfires almost all the time, and engine makes chirping sounds when running. What's wrong and how do I fix it?


The first thing to check is the spark plug. Pull out the #5 (or all plugs) and check the color on the isulator. It should be golden brown. If the color is black, the cylinder is running rich and this could be a valve or timing issue. If the color is light, the injector pintle may be dirty or there may not be spark in that clyinder. Test for spark and if there is none, it may be the plug, wire or the coil. Replace the plugs if they look worn or if there are lots of miles on them. Replace the wires if they also have lots of miles on them and show signs of wear. To clean the injectors I recommend the Lucas gas treatment. This will clean and lube the fuel and valve train. It will also help remove any carbon build-up in the pistons and carbon can cause misfires. If there are trouble codes, have them pulled to see what the computer is reading for errors. If you use Shell gas, stop using it. This gas is proven to be harmful to GM but Esso and Chevron are the ones to use.
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2001 GMC Jimmy Idling rough


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I'm having a problem with my 87 Old Delta 88 Royale misfiring and smelling of gas. My son-in-law changed the plugs and wires. They also put a new oxygen sensor on it. Does it take two sensors or one? This...


the oxygen sensor just reports back to the computer if the fuel mixture is too rich or too lean so the COMPUTER can control the fuel flow.

You are sending raw fel into your converter that is overhating trying to treat that much unburned fuel. Don't do this for long or you will ruin the converter.

I'm not familiar with your ignition system, but that is where the problem is. It may be the distributor cap that has a carbon track (looks like a crack) in it. Or, it could be a coil that's bad if you have a separate coil for each spark plug.
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1 Answer

1999 vw jetta 2.0


Sounds like two problems. P0300 and P0303 are possibly spark plugs. They could be a coil pack but I'm leaning toward a spark plug problem because of the other two codes - they're indicating O2 sensor problems. If the O2 sensors are screwed up, the car reverts to preprogrammed, rich fuel maps that send excessive fuel through the engine. The reasoning is, if the ECU can't trust the O2 sensors to determine how much fuel to burn optimally, it'll pump a bunch of extra fuel through the engine to keep it safe. Having too little fuel (aka running lean) can destroy an engine, so the ECU plays it safe and runs rich (too much fuel) instead. The consequences of rich running are relatively minor compared to lean running, but can and do tend to create excessive carbon buildup on the catalytic converter and O2 sensors, as well as fouling spark plugs.

First thing to do though is to swap the wires on your coil packs and see if you end up with a misfire code for the same cylinder #3. If you do, then it's the plug or wire. If it moves, it's the coilpack. Replace whichever part is faulty. You'll probably need oxygen sensors too, before you can clear all the codes.

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